Page 1 MULTIFUNCTION GENERATOR WF1981/WF1982 Instruction Manual (Operations)
Page 3 DA00104485-002 DA00046516-004 MULTIFUNCTION GENERATOR WF1981/WF1982 INSTRUCTION MANUAL (Operations)
Page 4 Registered Trademarks Other company names and product names used in this instruction manual may be trademarks or registered trademarks of their respective companies.
Page 5 ⎯⎯⎯ Preface ⎯⎯⎯ Thank you very much for purchasing our "Multifunction Generator WF1981/WF1982". To use this instrument in a safe and correct manner, please first read the next section titled "Safety Precautions". ⚫ Caution symbols used in this manual The following caution symbols are used in this manual. Be sure to observe them and their accompanying information to ensure the safety of the user and avoid damage to the instrument.
Page 6 8. Convenient Use of 2-channel Equipment (WF1982) This chapter describes how to coordinate the settings of two channels. 9. Synchronizing Multiple Units This chapter describes how to configure a multi-phase oscillator by connecting multiple units of this product. 10. Using External Frequency Reference This chapter describes how to use an external frequency reference.
Page 7 ⎯⎯⎯Safety Precautions⎯⎯⎯ To ensure safe use, be sure to observe the following warnings and cautions. NF Corporation shall not be held liable for damages that arise from a failure to observe these warnings and cautions. This product is a Class I instrument (with protective conductor terminal s) that conforms to the JIS and IEC insulation standards.
Page 8 Take care that water does not get inside the product or the product does not get wet. Using the product while it is wet may cause electric shock or fire. If water or other liquid has entered inside the product, immediately disconnect the power cable and contact NF Corporation or one of our representatives. ⚫...
Page 9 CAUTION Caution Symbol This symbol indicates information for the avoidance of damage to the instrument during handling. Disassembly Prohibited Symbol This symbol is displayed on the main unit. It indicates that disassembling this product may result in electric shock or other injury. Electric Shock Danger Symbol This symbol is displayed on the main unit.
Page 10 MEMO WF1981/WF1982...
Page 11: Table Of Contents
Table of Contents Page Overview ..............................1-1 Features ..........................1-2 Operating Principles ......................1-3 Preparations Before Use ..........................2-1 Checking Before Use ......................2-2 Installation ........................... 2-3 Grounding and Power Supply Connection ................. 2-4 Various Downloads ......................2-5 Calibration ........................... 2-5 Panels and I/O Terminals ..........................
Page 12 4.4.6 To Set Phase..........................4-34 4.4.7 To Set Amplitude ......................... 4-36 4.4.8 To Set DC Offset ......................... 4-37 4.4.9 To Set Output Level with High/Low Level ................. 4-38 4.4.10 To Set Waveform Polarity and Amplitude Range ................ 4-39 4.4.11 How to Use Auto Range/Range Hold for Output Voltage ............4-41 4.4.12 To Set Load Impedance .......................
Page 13 5.1.1 To Save to the Unit's Internal Memory ..................5-2 5.1.2 To save to USB Flash Drive ......................5-3 Procedure to Recall Settings ....................5-5 5.2.1 To Recall from the Unit's Internal Memory ................... 5-5 5.2.2 To recall from USB Flash Drive ....................5-6 To Rename Setting Memory ....................
Page 14 11.3 Basics ..........................11-4 11.4 In-Step Processing Flow ....................11-12 11.5 Setting and Operation Procedure ................... 11-13 11.6 Saving Created Sequence ....................11-18 11.6.1 Saving to Internal Memory ......................11-18 11.6.2 Saves to USB Flash Drive ......................11-19 11.7 Using the Saved Sequence .................... 11-20 11.7.1 To Retrieve from Internal Memory ....................
Page 15 17.4.2 DC Offset ............................. 17-4 17.4.3 Load Impedance Setting ......................17-4 17.4.4 Waveform Output ........................17-4 17.4.5 Synchronization/Sub-output (SYNC/SUB OUT) ................ 17-4 17.5 Main Signal Characteristics ....................17-5 17.5.1 Sine wave............................. 17-5 17.5.2 Square wave ..........................17-5 17.5.3 Pulse Wave ..........................17-6 17.5.4 Ramp Wave ..........................
Page 16 Figures and Tables Page Figure 1-1 WF1981Block Diagram ....................1-4 Figure 1-2 WF1982Block Diagram ....................1-5 Figure 3-1 Front Panel of WF1981 ....................3-2 Figure 3-2 Rear Panel of WF1981 ....................3-3 Figure 3-3 Front Panel of WF1982 ....................3-4 Figure 3-4 Rear Panel of WF1982 ....................
Page 17: Overview
1. Overview Features ........................1-2 Operating Principles ....................1-3 WF1981/WF1982...
Page 18: Features
1.1 Features Features The WAVE FACTOR WF1981/WF1982 Multifunction Generator are digital multifunctional oscillators. The WF1981 is a single channel, the WF1982 is a two channel. ⚫ Maximum frequency: 30 MHz (sine wave), 15 MHz (square wave, pulse). ⚫ Frequency accuracy: ±(1 ppm+4 pHz), minimum resolution 0.01 µHz. Supports a 10 MHz external frequency reference.
Page 19: Operating Principles
1.2 Operating Principles Operating Principles A block diagram of WF1981 is shown in Figure 1-1, and block diagram of WF1982 is shown in Figure 1-2. ◼ Analog Section • The digital synthesizer (DDS) operates on a 240 MHz clock and generates various types of oscillations and waveforms.
Page 20: Figure 1-1 Wf1981Block Diagram
1.2 Operating Principles ◼ WF1981 Block Diagram ANALOG CH1 62 kHz Bessel ±1 V 234 kS/s MOD/ADD 10 MHz BW Waveform memory External 32 MiW ×2 modulat ion/ SDRAM External addition (switchable) ±0.4 V PG AMP PG AMP FCTN ±2 V 16 bit- Isolation 2×D/A...
Page 21: Figure 1-2 Wf1982Block Diagram
1.2 Operating Principles ◼ WF1982 Block Diagram ANALOG CH2 62 kHz Bessel ±1 V 234 kS/s MOD/ADD 10 MHz BW Waveform memory External ×2 32 MiW modulat ion/ SDRAM External addit ion ±0.4 V (switchable) PG AMP PG AMP ±2 V FCTN 16 bit- 2×D/A...
Page 22 1.2 Operating Principles MEMO WF1981/WF1982...
Page 23: Preparations Before Use
1.2 Operating Principles Preparations Before Use Checking Before Use ......................2-2 Installation ........................... 2-3 Grounding and Power Supply Connection ................. 2-4 Various Downloads ......................2-5 Calibration ........................... 2-5 WF1981/WF1982...
Page 24: Checking Before Use
Check all of the items that were taken out of the container. If there are any signs of damage to the exterior of the product, missing accessories, or other problems, contact NF Corporation or one of our representatives. • Checking the Exterior Check that the panels, knobs, connectors, and other parts are not damaged or dented.
Page 25: Installation
2.2 Installation Installation Installation location Do not place the instrument with the rear panel facing downward. The connectors may be damaged and ventilation will be blocked. Place the instrument on a flat surface such as on a desk so that the four rubber feet and stands on the bottom rest on that surface. Installation conditions •...
Page 26: Grounding And Power Supply Connection
2.3 Grounding and Power Supply Connection Provide sufficient ventilation holes in the rack, or provide forced-air cooling by fan. For the dimensional drawings for rack mounting, refer to: ☞ Rack mount (EIA, for 1 unit PA-001-3838) P.17-23 ☞ Rack mount (EIA, for 2 units PA-001-3839) P.17-24 ☞...
Page 27: Various Downloads
2.4 Various Downloads Various Downloads Search for the latest firmware and instruction manuals for this product as well as the application software for editing arbitrary waveforms and sequences from the support page of our website (https://www.nfcorp.co.jp/english/). ☞ For how to check the firmware version of the product, see section 13.4. P.
Page 28 2.5 Calibration MEMO WF1981/WF1982...
Page 29: Panels And I/O Terminals
2.5 Calibration Panels and I/O Terminals Panel Component Names and Functions ................3-2 I/O Terminals ........................3-6 Cautions on Floating Ground Connection ................ 3-16 WF1981/WF1982...
Page 30: Panel Component Names And Functions
3.1 Panel Component Names and Functions Panel Component Names and Functions This section describes the names and functions of the components on the front panel and rear panel. 3.1.1 Front Panel of WF1981 Basic parameter shortcut keys Allows the waveform, frequency, amplitude, DC offset, and oscillation Numeric keypad mode to be changed.
Page 31: Rear Panel Of Wf1981
3.1 Panel Component Names and Functions 3.1.2 Rear Panel of WF1981 Air outlet ☞ P.2-3 Power supply input ☞ P.2-4 USB connector LAN connector Multi I/O connector Used for sweeps, sequence control, and output of synchronization codes. ☞ P.3-14 Frequency reference output terminal ☞...
Page 32: Front Panel Of Wf1982
3.1 Panel Component Names and Functions 3.1.3 Front Panel of WF1982 Basic parameter shortcut keys Numeric keypad Allows the waveform, frequency, Used for numerical input and amplitude, DC offset, and oscillation waveform setting mode to be changed. ☞ P.4-16 P.4-17 ☞...
Page 33: Rear Panel Of Wf1982
3.1 Panel Component Names and Functions 3.1.4 Rear Panel of WF1982 CH1 external modulation/addition input terminal ☞ P.3-9 CH2 external modulation/addition input terminal ☞ P.3-9 CH1 external trigger input terminal ☞ P.3-11 CH2 external trigger input terminal ☞ P.3-11 Air outlet ☞...
Page 34: I/O Terminals
3.2 I/O Terminals I/O Terminals WARNING To prevent electric shocks, do not apply a voltage exceeding 42 Vpk (DC + AC peak) between the ground of the BNC connectors insulated from the enclosure and the enclosure. Also, do not apply a voltage exceeding 42 Vpk (DC + AC peak) between the grounds of the BNC connector groups insulated from the enclosure.
Page 35: Waveform Output (Fctn Out)
3.2 I/O Terminals 3.2.1 Waveform Output (FCTN OUT) • WF1981 WF1982 • CH2 FCTN OUT CH1 FCTN OUT FCTN OUT [Insulated from enclosure] [Insulated from enclosure] [Insulated from enclosure] A signal with the set waveform, frequency, and amplitude is output. ◼...
Page 36: Synchronization/Sub-Output (Sync/Sub Out)
3.2 I/O Terminals 3.2.2 Synchronization/Sub-output (SYNC/SUB OUT) WF1981 WF1982 SYNC/SUB OUT SYNC/SUB OUT SYNC/SUB OUT [Insulated from enclosure] [Insulated from [Insulated from enclosure] enclosure] A synchronization signal is output according to the waveform or oscillation status. This signal can be used as the synchronization signal for oscilloscope. An internal modulation signal or sub waveform can also be output.
Page 37: External Modulation/Addition Input (Mod/Add In)
3.2 I/O Terminals degree of the reference phase. If the phase setting is changed, the phase between the reference phase ☞ synchronization signal and waveform output can be changed. P.4-34 At high frequencies, there is a phase difference equivalent to about 10 ns even with a 0 ° setting due to the difference in the propagation delay time of the output circuits of the waveform output and synchronization/sub output.
Page 38 3.2 I/O Terminals ◼ Input characteristics Input voltage ±1 V full scale Maximum allowable input ±2 V Input impedance 10 kΩ Input frequency During modulation: DC to 50 kHz (-3dB) During addition: DC to 10 MHz (-3dB) Signal GND Same potential as the same channel waveform output, insulated from the enclosure (maximum 42 Vpk).
Page 39: External Trigger Input (Trig In)
3.2 I/O Terminals 3.2.4 External Trigger Input (TRIG IN) WF1981 WF1982 TRIG IN TRIG IN #1 TRIG IN #2 This terminal can be used as external trigger input in the following cases. The polarity setting can be changed. ☞ • Start trigger of single sweep P.4-87 ☞...
Page 40: External 10 Mhz Frequency Reference Input (10 Mhz Ref In)
3.2 I/O Terminals 3.2.5 External 10 MHz Frequency Reference Input (10 MHz REF IN) WF1981 WF1982 10MHz REF IN 10MHz REF IN [Insulated from enclosure] [Insulated from enclosure] This terminal can be used for the following purposes. ◼ When frequency accuracy higher than the frequency accuracy specification of this product is required, or when you want to use the same frequency reference as a different signal generator Input the 10 MHz reference signal from an external frequency standard.
Page 41: Frequency Reference Output (Ref Out)
3.2 I/O Terminals 3.2.6 Frequency Reference Output (REF OUT) WF1981 WF1982 REF OUT REF OUT This terminal is used to unify the frequency and phase of multiple WF198x units. Connect the frequency reference output of the primary unit when multiple units are connected together with a synchronous connection, or the primary WF198x, to the external 10 MHz frequency reference input of the secondary WF198x.
Page 42: Multi-I/O (Multi I/O)
3.2 I/O Terminals 3.2.7 Multi-I/O (MULTI I/O) WF1981 WF1982 MULTI I/O MULTI I/O This terminal can be used for sweep and sequence control. It outputs the step synchronization code for the sequence. ◼ Control Input for sweep oscillation mode ☞ Sweep oscillation can be controlled as follows using 3-bit logic input.
Page 43: Figure 3-5 Multi-I/O Connector Pin Configuration Diagram
TTL level (low: 0.4 V or lower, high: 2.7 V or higher) Signal GND Same potential as the enclosure Connector Mini D-sub 15-pin The connection cable is an option. Please contact NF Corporation or one of our representatives for details. WF1981/WF1982 3-15...
Page 44: Cautions On Floating Ground Connection
3.3 Cautions on Floating Ground Connection Cautions on Floating Ground Connection The signal ground of the BNC terminals for waveform output, synchronization/sub-output, and modulation/addition input is shared, but since it is insulated from the enclosure (ground potential), it can be connected to equipment that has a different potential. Moreover, when the equipment is mounted in a rack, the signal ground is not affected by t he potential of the rack.
Page 45: Figure 3-6 Cautions On Floating Ground Connection For Wf1981
3.3 Cautions on Floating Ground Connection ◼ Cautions on floating ground connection for WF1981 FCTN OUT SYNC/SUB OUT ANALOG MOD/ADD IN Use this with a potential Use this with a 1 MΩ difference of 42 Vpk or less potential difference of 42 Vpk or less! Enclosure ground 10 MHz...
Page 46 3.3 Cautions on Floating Ground Connection MEMO WF1981/WF1982 3-18...
Page 47: Basic Operations
Basic Operations Power On/Off and Restoration of Settings ................. 4-2 Screen Configuration and Operation .................. 4-6 Basic Settings and Operations ..................4-14 Setting for Main Items ....................... 4-30 Using Parameter-Variable Waveforms ................4-59 Using Arbitrary Waveforms ....................4-61 Setting and Operation of Modulation ................4-63 Setting and Operation of Sweep..................
Page 48: Power On/Off And Restoration Of Settings
4.1 Power On/Off and Restoration of Settings Power On/Off and Restoration of Settings 4.1.1 How to Turn Power On/Off ◼ Power-on operation The start screen is displayed Power off state The power is turned on Press the (standby state) power switch Once the power is turned on, a self test is executed automatically, and then the instrument becomes operable.
Page 49: Restoration Of Settings At Power-On
4.1 Power On/Off and Restoration of Settings 4.1.2 Restoration of Settings at Power-on When the power is turned on by the power switch, the settings when the power switch was last turned off are restored. However, the output on/off settings at power-on can be set on the Utility ☞...
Page 50 4.1 Power On/Off and Restoration of Settings While the power is off, even if the power supply is cut off by, for example, shutting off the breaker or even if the power cable is disconnected, this will not affect the restore operation when the power is turned on again next time.
Page 51 4.1 Power On/Off and Restoration of Settings • The settings immediately before are not restored. • The contents of setting memory number 1 are set. ☞ P.5-2 • The output on/off settings at power-on can be changed on the Utility screen. ☞ P.4-23 •...
Page 52: Screen Configuration And Operation
4.2 Screen Configuration and Operation Screen Configuration and Operation 4.2.1 Screen Configuration The LCD screen consists of four areas, as shown in the following figure. Status display area Tab area Setting area Soft key display area ◼ Tab area These tabs are for switching the setting parameters to display in the setting area. The tabs are split into three groups, and the settings that are displayed vary depending on the combination of the three tabs.
Page 53 • Unadjusted status UCal Displayed when the correction values of the product are lost for some reason, and the prescribed performance cannot be maintained. As this indicates a failure, please contact NF Corporation or one of our representatives. • Oscillation mode Displays the current oscillation mode.
Page 54 4.2 Screen Configuration and Operation • Operation status Displays the oscillation status when in sweep oscillation mode and burst oscillation mode. ■ ▶ indicates that stopped, that executing, that paused, and that waiting for trigger. • Modulation state Displays the oscillation status when in sweep oscillation mode and burst oscillation mode. ■...
Page 55: Setting Screen
4.2 Screen Configuration and Operation 4.2.2 Setting screen page switching The setting screen has a total of four pages, and the names [Basic], [Sweep], [Burst], and [Modu] are displayed respectively for them in the tab area. Page 1 [Basic] and page 4 [Modu] are always displayed, and page 2 [Sweep] is displayed additionally when in sweep oscillation mode and page 3 [Burst] is displayed additionally when in burst oscillation mode.
Page 56: Switching Display Format With Tabs
4.2 Screen Configuration and Operation ■ Page 4: [Modu] This page is for displaying the modulation type, modulation source, and other parameters for modulation. The displayed items vary depending on the waveform and modulation type. The page is indicated by the name [Modu] in the tab area. This page can always be selected. 4.2.3 Switching Display Format with Tabs When multiple display formats can be selected, the display format switching tabs are displayed on...
Page 57 4.2 Screen Configuration and Operation ◼ 2-channel simultaneous display [Dual] (WF1982) Displays the settings of CH1 and CH2 in text format arranged vertically one above the other. The channel to be set can be switched by using the CH-SEL key. To switch the display format The Single tab screen is displayed...
Page 58: Top Menu
4.2 Screen Configuration and Operation Check In WF1982, the display can be switched between 2-channel simultaneous display and 1-channel display with the tabs. 4.2.4 Top Menu Oscillator/sequence switching, arbitrary waveform editing, system settings, saving and recalling settings, and other tasks can be performed by selecting the desired item from the top menu. To display the top menu Pressing the MENU key displays the following top menu window.
Page 59: Saving A Screenshot
4.2 Screen Configuration and Operation ◼ Memory Saves and recalls in the setting memory, arbitrary waveform memory, and sequence memory. ☞ Saving and recalling settings P. 5-2 and P.5-6 ☞ Saving and recalling arbitrary data P. 7-10,7-11 and P. 7-13 ☞...
Page 60: Basic Settings And Operations
4.3 Basic Settings and Operations Basic Settings and Operations 4.3.1 To Switch operating mode (Oscillator or Sequence Oscillation). Press the MENU key to display the top menu. The example on the left is for oscillator. Try switching this to sequence. The current operation mode is displayed.
Page 61: To Change Frequency, Amplitude, And Other Values
4.3 Basic Settings and Operations 4.3.2 To Change Frequency, Amplitude, and Other Values To change a value with the up/down arrow keys (or the modify knob) Select the desired item with the arrow keys or the modify knob. In the example on the left, the frequency [Freq] field is selected.
Page 62 4.3 Basic Settings and Operations Press the ENTER key to close the input field. If you press the CANCEL key instead of the ENTER key, the changed value is discarded and the setting before the change is restored. The input field is closed To change a value with the numeric keypad [0]...[9] Select the desired item with the arrow keys or the modify knob.
Page 63: To Change The Waveform And Oscillation Mode
4.3 Basic Settings and Operations Check If a setting item is displayed on a soft key, you can open the input field for that item by pressing that soft key. 4.3.3 To Change the Waveform and Oscillation Mode Select the desired item with the arrow keys or the modify knob.
Page 64: Shortcut Keys For Changing Basic Parameters
4.3 Basic Settings and Operations 4.3.4 Shortcut Keys for Changing Basic Parameters The selection list or input field for waveform, frequency, amplitude, DC offset, and oscillation mode can be immediately opened by using the corresponding basic parameter shortcut key. ◼ Frequency The frequency input field is opened ◼...
Page 65: Functions Of Enter/Cancel/Undo Key
4.3 Basic Settings and Operations 4.3.5 Functions of ENTER/CANCEL/UNDO Key ◼ Functions of ENTER key The ENTER key can be used to perform the following actions. • Open the input field or selection list for the selected item. • Set a value input from the numeric keypad. •...
Page 66: To Change The Display Unit
4.3 Basic Settings and Operations 4.3.6 To Change the Display Unit a) To change the unit prefix (k, m, M, etc.) Frequency is used as an example here. The procedure is the same for amplitude and pulse width. Select frequency and then press the ENTER key to open the input field.
Page 67 4.3 Basic Settings and Operations b) To change Vp-p, Vrms, user-defined unit, etc. Amplitude is used as an example here. The procedure is the same for frequency and pulse width. Select amplitude and then press the ENTER key to open the input field. The input field is opened Press the [Unit] soft key to move the cursor to "Vp-p."...
Page 68: Ch1/Ch2 Switching Key And Active Channel (Wf1982)
4.3 Basic Settings and Operations 4.3.7 CH1/CH2 Switching Key and Active Channel (WF1982) Each time the CH1/CH2 switching key is pressed, the channel to be set is switched alternately. This key is disabled on the setting screens that are not dependent on the channel.
Page 69: Operations Available On Utility Screen
4.3 Basic Settings and Operations 4.3.8 Operations Available on Utility Screen Displaying the Utility screen When the MENU key is pressed, the top menu opens. Select [UTILITY] and then press the ENTER key. The Utility screen opens. Utility screen configuration External 10 MHz Initialization frequency...
Page 70 4.3 Basic Settings and Operations Configures the output on/off settings and automatic sequence start on/off settings for when the ☞ power is turned on. P.4-27 • External 10 MHz frequency reference I/O settings [Ref Clock IO] Enables/disables reference input and switches the output of reference output on/off. This also indicates whether a valid signal is being input to the reference input.
Page 71: To Restore Initial Settings
4.3 Basic Settings and Operations 4.3.9 To Restore Initial Settings ☞ Restore the initial settings from the Utility screen. For a list of the initial settings, see P.16-2 and 16-4. Press the MENU key to display the top menu. Then, press the [UTILITY] soft key. The Utility menu opens.
Page 72: Output On/Off
4.3 Basic Settings and Operations In the Utility screen, select [Information] and then press the ENTER key. In the Utility screen, select [Information] and then press the ENTER key. Press the Initialize soft key on the very left. Press the Initialize soft key. Select OK and then press the ENTER key to start processing.
Page 73 4.3 Basic Settings and Operations Check • The on/off setting for waveform output uses a mechanical relay. This causes chattering to occur when the waveform output is switched on or off. Please use the trigger burst or gate oscillation mode when connecting to equipment which might malfunction due to chattering.
Page 74 4.3 Basic Settings and Operations Select the setting on the Utility screen. Press the MENU key to displays the top menu window. Then, press the [UTILITY] soft key. The Utility menu opens. In the top menu, select [Utility] and then press the ENTER key Select [Power-On State] in the Utility screen and then press the ENTER key.
Page 75: To Use Usb Flash Drive
4.3 Basic Settings and Operations 4.3.12 To Use USB Flash Drive In the store / recall screen of setting, arbitrary waveform, and sequence settings, switch the operation target by tab selection to internal memory or USB Flash Drive. To select the operation target, switch the screen using the tabs.
Page 76: Setting For Main Items
4.4 Setting for Main Items Setting for Main Items This section describes how to set the main items that are set in the Oscillator. When you press the MENU key while another screen is displayed, the Top menu is displayed. Select [Settings] and then press the ENTER key.
Page 77: To Set Waveforms
4.4 Setting for Main Items 4.4.3 To Set Waveforms Press the FCTN shortcut key to open the waveform selection list. Or, select the [Fctn] field and then press the ENTER key to open the selection list. Waveform selection list Select the desired waveform from the selection list and then press the ENTER key to reflect it in the output.
Page 78: To Set Frequency
4.4 Setting for Main Items 4.4.4 To Set Frequency Press the FREQ shortcut key to open the frequency input field. Or, select the [Freq] field and then press the ENTER key. If [Period] is displayed for the [Freq] field because not the frequency but the period is displayed, press and hold down the FREQ key or press the [Freq] soft key.
Page 79: To Set Period
4.4 Setting for Main Items 4.4.5 To Set Period The period can be set instead of the frequency. The following two methods are available to change from frequency display to period display:  Changing to period display using the [Freq] / [Period] soft key The input field of frequency opens.
Page 80: To Set Phase
4.4 Setting for Main Items 4.4.6 To Set Phase There is a virtual phase reference inside the main unit, and a waveform shifted by the value set in [Phase] with respect to that reference is output. a) Setting procedure Select the [Phase] field and then press the ENTER key to open the phase input field.
Page 81 4.4 Setting for Main Items ◼ Phase reference point of pulse wave In the case of a pulse wave, the phase Phase setting: Zero phase position reference point is not the center of the Example of 0° of waveform output transition part but the point where the transition begins.
Page 82: To Set Amplitude
4.4 Setting for Main Items Check With an arbitrary waveform or parameter-variable waveform, note that changing the phase will cause a waveform with transient disturbance to be output because waveform data will be rewritten to the waveform memory. Additionally, when changing the phase, it takes approximately 0.5 seconds for parameter variable waveforms and control point method arbitrary waveforms, and approximately 1 second per 1 Mi words for array format arbitrary waveforms.
Page 83: To Set Dc Offset
4.4 Setting for Main Items c) Available units differ depending on the waveform Vp-p, Vpk, Vrms, dBV, dBm, and user-defined units can be used as the units for amplitude. However, the waveforms to which the units can be applied are restricted as follows (DC is excluded from amplitude settings).
Page 84: To Set Output Level With High/Low Level
4.4 Setting for Main Items b) Restriction on AC + DC The maximum total value of AC amplitude and DC offset is restricted to ±10.5 V/open. For example, when the AC amplitude is 5 Vp-p/open, DC offset is restricted to the range from -8 V/open to +8 V/open.
Page 85: To Set Waveform Polarity And Amplitude Range
4.4 Setting for Main Items When the input field of high level or low level is open, the settings in the same way as for DC offset. When a numeric value is entered by using the numeric keypad, the unit key for high level/low level setting is displayed on the soft key.
Page 86 4.4 Setting for Main Items b) Polarity and amplitude range You can invert the polarity or change the amplitude range to single polarity. The following figure shows the cases with sine waves: Amplitude range Polarity −FS/0 ±FS 0/+FS Normal [Normal] −FS −FS Invert...
Page 87: How To Use Auto Range/Range Hold For Output Voltage
4.4 Setting for Main Items The amplitude will change in reference to the top of the waveform when the amplitude range is set to -FS/0. (Gaussian pulses are waveforms including parameter-variable waveforms.) d) Restriction by amplitude range • When the amplitude range is -FS/0 or 0/+FS, the maximum amplitude is half of ± FS. •...
Page 88 4.4 Setting for Main Items b) Maximum values of amplitude/DC offset for fixed range When a range is fixed, the maximum values of amplitude and DC offset and the external addition gain are fixed as shown in the following table. Range (maximum Maximum Maximum...
Page 89: To Set Load Impedance
4.4 Setting for Main Items 4.4.12 To Set Load Impedance By matching the setting value of the load impedance to an actual loading condition, the amplitude and DC offset (including the setting according to high level and low level) can be set with the voltage that appears to the load end.
Page 90: To Add External Signal
4.4 Setting for Main Items b) Conversion formula Converted by the following formula: Load impedance setting value: Rload (Ω) Output voltage when load is opened: Vopen Output voltage setting value (load end voltage): Vload Rload  Vload Vopen Rload Check •...
Page 91 4.4 Setting for Main Items b) To enable the addition signal Set the external addition on the Utility screen. Press the MENU key to display the top menu window. Then, press the soft key corresponding to [UTILITY]. The Utility menu opens.
Page 92 4.4 Setting for Main Items c) If the desired external addition condition cannot be selected ◼ External addition cannot be ON (set as x0.4, x2, x10) An external modulation is used. To use the external addition, change the modulation source to Internal. The external addition input terminal is being shared with the external modulation input terminal.
Page 93: To Set Duty Of Square Wave
4.4 Setting for Main Items 4.4.14 To Set Duty of Square Wave The waveform is assumed to be set as square wave [Square]. For how to set the waveform,  P.4-17. The setting unit for duty is % only. It cannot be set or displayed with time. a) How to set the duty Select the [Duty] field and then press the ENTER key to open the duty input field.
Page 94 4.4 Setting for Main Items c) Difference between standard and extended duty variable range Variable range Features Standard Setting range: 0.0001% to 99.9999% • Duty can be changed within the range where jitter is low and the pulse does not disappear. •...
Page 95: To Set The Pulse Width, Leading/Trailing Edge Times, And Transition Waveform Of The Pulse Wave
4.4 Setting for Main Items 4.4.15 To Set the Pulse Width, Leading/Trailing Edge Times, and Transition Waveform of the Pulse Wave The waveform is assumed to be set as pulse wave [Pulse]. For how to set the waveform,  P.4-17. Set the pulse width with time or duty.
Page 96 4.4 Setting for Main Items c) To toggle pulse width time and pulse width duty  Pulse width time → Pulse width duty The input field of pulse width time opens. When the current pulse width time is displayed, the [Duty] soft key is displayed. Press the key to open the input field of pulse width duty, and change the display from [Width] to [Duty].
Page 97 4.4 Setting for Main Items f) Definitions and limitations of pulse width, leading edge time, trailing edge time, leading edge zone, and trailing edge zone The definitions of pulse width, leading edge time, trailing edge time, leading edge zone, and trailing edge zone are shown in the following figure.
Page 98 4.4 Setting for Main Items g) Transition waveform types and setting method ◼ Transition waveform types The following waveforms can be selected for the shapes of the leading-edge zone and trailing edge zone of the pulse waveform.  COS This waveform is the same shape as the zone of 0° to +180° of a sine wave. The setting range of the leading and trailing edge times is 7.7 ns to 59.03 Ms.
Page 99 4.4 Setting for Main Items  ARB The first half of the arbitrary waveform is used as the leading edge, and the second half as the trailing edge. You can select an arbitrary waveform of array format out of the waveforms in the edit memory or the arbitrary waveform memory of the main unit.
Page 100: To Set Ramp Wave Symmetry
4.4 Setting for Main Items 4.4.16 To Set Ramp Wave Symmetry ☞ The waveform is assumed to be set to ramp wave [Ramp]. For how to set the waveform, P.4-17. The unit of symmetry is %. It cannot be set or displayed with time. a) How to set symmetry Select the [Symm] field and then press the ENTER key to open the input field for symmetry.
Page 101: To Set The Equivalent Noise Bandwidth
4.4 Setting for Main Items 4.4.17 To Set the Equivalent Noise Bandwidth When the noise waveform is selected, the [BW] item will appear to set the equivalent noise bandwidth. The equivalent noise bandwidth can be set to seven different levels. Select the optimal equivalent bandwidth so that the noise voltage in the bandwidth will be sufficiently large because the wider the equivalent bandwidth, the more the amplitude density of the noise will decrease, even if the same output amplitude is set.
Page 102: To Set The Setting Range Limit Values
4.4 Setting for Main Items 4.4.18 To Set the Setting Range Limit Values The setting range for the setting values of the signals to be output from the waveform output can be limited. The parameters that can be limited are frequency, voltage, phase, and duty. With respect to voltage, the setting range limit values apply to the positive and negative peak values of the waveform amplitude and DC offset combined.
Page 103: To Select Sub Output
4.4 Setting for Main Items 4.4.19 To Select Sub Output A signal output from the synchronization/sub output terminal is called sub output. It can be selected in the sub output selection [SubOut] setting on page 4 of the Oscillator setting screen.
Page 104 4.4 Setting for Main Items ◼ Off [Off] Output will be a direct current of about 0 V. This helps to reduce interference from a ground common with externally connected devices or from a synchronization output signal. The output impedance changes to about 100 Ω at this time. WF1981/WF1982 4-58...
Page 105: Using Parameter-Variable Waveforms
4.5 Using Parameter-Variable Waveforms Using Parameter-Variable Waveforms ☞ For details on variable parameter waveforms, P. 6-2 To output a parameter-variable waveform (PWF) Press the FCTN shortcut key. Press the key ([5] key) corresponding to the PWF. Or, select the [Fctn] field and then press the ENTER key to open the selection list.
Page 106 4.5 Using Parameter-Variable Waveforms Press the [OK] soft key to confirm the changes and exit the selection screen. Press the [Cancel] soft key to discard the changes and exit the selection screen. Press the basic parameter shortcut key to confirm the changes and exit the selection screen.
Page 107: Using Arbitrary Waveforms
4.6 Using Arbitrary Waveforms Using Arbitrary Waveforms For how to create an arbitrary waveform,  P.7-2. To output an arbitrary waveform saved in USB Flash Drive, it must first be copied to the edit memory ☞ or internal memory. For the recall method, P.
Page 108 4.6 Using Arbitrary Waveforms [ARB] flashes while the waveform changes While the arbitrary waveform is switching, the [ARB] icon at the top right of the screen flashes. The speed at which the waveforms switch is approximately 1 Mi words per second. For a 32 Mi words waveform, it takes approximately 30 seconds.
Page 109: Setting And Operation Of Modulation
4.7 Setting and Operation of Modulation Setting and Operation of Modulation 4.7.1 Modulation Function Modulation can be performed with respect to setting values that do not generate a conflict in, of course, continuous oscillation mode but also while performing burst oscillation or sweep oscillation.
Page 110: Screen For Settings And Operation Of Modulation
4.7 Setting and Operation of Modulation 4.7.3 Screen for Setting and Operation of Modulation The following explains the common screen configuration of the modulation function. Perform configuration and operation in the Oscillator setting screen. When you press the MENU key while another screen is displayed, the Top menu is displayed.
Page 111 4.7 Setting and Operation of Modulation Setting the modulation source to internal [Int] and the sub output selection [SubOut] to internal modulation waveform [ModFctn] will output an internal modulation signal from the synchronization/sub output BNC terminal. When the modulation width is 0, the internal modulation signal can be used as an independent signal source by freely setting its waveform, frequency, phase, amplitude, and DC offset.
Page 112 4.7 Setting and Operation of Modulation 4.7.4 Common Settings and Operation of Modulation The following explains the common settings and operation independent of the modulation type. Press the Next soft key multiple times to display page 4 of the setting screen ([Modu] in the tab area becomes selected).
Page 113 4.7 Setting and Operation of Modulation d) To modulate with internal signal source Set the modulation source [Source] to internal [Int] on page 4 of the setting screen. The internal modulation waveform [ModFctn], internal modulation frequency [ModFreq], and internal modulation phase [ModPhs] must be set. Select the internal modulation waveform [ModFctn] from the following eight types: •...
Page 114 4.7 Setting and Operation of Modulation f) To start modulation → Modulation starts automatically. Resume modulation with the [ModStart] soft key When the modulation function is set to on, modulated oscillation starts automatically. However, the modulated oscillation will not start if the modulation setting is inappropriate ([Conflict] will be displayed in the channel status area).
Page 115 4.7 Setting and Operation of Modulation ◼ When [ModFctn] is selected (only when modulation function is on and using internal modulation) The internal modulation waveform is output from the synchronization/sub -output BNC terminal. The amplitude can be set in sub output amplitude [SubAmp], and the DC offset in sub output offset [SubOfs].
Page 116: Setting Fm
4.7 Setting and Operation of Modulation 4.7.5 Setting FM The output frequency varies according to the instantaneous value of the modulation signal. For details on the modulation setting screen and common operation method, see P.4-64 and P.4-66. a) Example of FM When the modulating signal swings to the positive side, the frequency of the output signal increases.
Page 117: Setting Fsk
4.7 Setting and Operation of Modulation 4.7.6 Setting FSK A binary frequency deviation modulation with which the output frequency is switched between the carrier frequency and hop frequency according to the modulating signal. For details on the modulation setting screen and common operation method, see P.4-64, P.4-66. a) Example of FSK The frequency changes abruptly, but the phase continuity of the output signal is maintained.
Page 118: Setting Pm
4.7 Setting and Operation of Modulation input, and the hop frequency is output for high-level input. When the polarity is set as negative [Negative], that is reversed. The internal modulation source setting is common to the burst internal trigger and sweep internal trigger settings.
Page 119: Setting Psk
4.7 Setting and Operation of Modulation d) Setting items necessary for PM Set the peak phase deviation [Deviation] on page 4 of the setting screen. The output phase varies within the range of ± peak phase deviation. When the modulation source [Source] is internal [Int], set the modulation waveform [ModFctn], modulation frequency [ModFreq], and modulation phase [ModPhs].
Page 120: Setting Am
4.7 Setting and Operation of Modulation In burst oscillation mode, PSK cannot be performed when other than auto burst. In sweep oscillation mode, PSK cannot be performed when p hase sweep and internal PM. d) Setting items necessary for PSK Set the phase deviation [Deviation] on page 4 of the setting screen.
Page 121: Setting Am (Dsb-Sc)
4.7 Setting and Operation of Modulation b) To select AM Set the modulation type [ModType] to AM [AM] on page 2 of the setting screen. Select [AM] in the modulation type setting menu c) Waveform where AM is unavailable AM cannot be performed for DC. AM cannot be performed when amplitude sweep.
Page 122 4.7 Setting and Operation of Modulation a) AM (DSB-SC) example The amplitude of the output signal increases when the absolute value of the amplitude of modulation signal is large. The polarity of the output signal reverses when the modulation signal is negative. Modulation sync signal (during internal modulation)
Page 123: Setting Dc Offset Modulation
4.7 Setting and Operation of Modulation cannot be selected during sweep oscillation mode. When the modulation source [Source] is external [Ext]/[Ext1]/[Ext2], input a modulating signal to the external modulation/addition input terminal. It is at the specified modul ation depth when ±1 V is input.
Page 124: Setting Pwm
4.7 Setting and Operation of Modulation d) Setting items necessary for DC offset modulation Set the DC offset [Offset] on page 1 of the setting screen. Set the peak DC offset deviation [Deviation] on page 4 of the setting screen. The output DC offset varies within the range of DC offset setting ±...
Page 125 4.7 Setting and Operation of Modulation PMW cannot be performed when duty sweep. d) Setting items necessary for PWM Set the carrier duty [Duty] on page 1 of the setting screen. Set the peak duty deviation [Deviation] on page 4 of the setting screen. The output duty is changed within the range of carrier duty ±...
Page 126: Setting And Operation Of Sweep
4.8 Setting and Operation of Sweep Setting and Operation of Sweep 4.8.1 Sweep type (Sweep type) Sweep can be done for the following five types: ☞ • Frequency sweep P.4-93 ☞ • Phase sweep P.4-95 ☞ • Amplitude sweep P.4-97 ☞...
Page 127 4.8 Setting and Operation of Sweep c) Page 2 of the setting screen: Screen for Setting the Sweep The following figure is an example of selecting the frequency as a sweep type. Sweep type Sweep Sweep Mode function Sweep time Sweep start value Sweep stop value Stop level of the...
Page 128 4.8 Setting and Operation of Sweep  Stop level [StpLvl] This is the signal level when gated single sweep is stopped. Set the level by specifying Off ☞ or On. Normally, set this to Off. P.4-86  External control [ExtCtrl] via Multi I/O connector ☞...
Page 129 4.8 Setting and Operation of Sweep 4.8.3 Common Setting and Operation of Sweep This section describes the common settings and operations regardless of the items to sweep all together. a) To sweep oscillation mode Press the MODE key to open the oscillation mode selection list.
Page 130 4.8 Setting and Operation of Sweep value of difference of the start value and stop value. If the log sweep of the frequency is selected, the center value is an arithmetic average of the start and the stop value. If it is changed to the center value or span value, the magnitude relation ship of the start value and stop value is maintained.
Page 131 4.8 Setting and Operation of Sweep Continuous one-way sweep Stop value Sweep value Start value Sweep time Frequency sweep example Continuous shuttle sweep Stop value Sweep value Start value Sweep time Sweep time Frequency sweep example i) To start sweep with trigger Set the sweep mode [SwpMode] on page 2 of the setting screen to single [Single].
Page 132 4.8 Setting and Operation of Sweep Single shuttle sweep Trigger Stop value Sweep value Start value Sweep time Sweep time Frequency sweep example j) To output waveform only when sweep running Set the sweep mode [SwpMode] on page 2 of the setting screen to gated single [Gated]. This is an operation that combines gate oscillation with sweep.
Page 133 4.8 Setting and Operation of Sweep Gated single one-way sweep Trigger Stop value Sweep value Start value Start value Sweep time Frequency sweep example Gated single shuttle sweep Trigger Stop value Sweep value Start value Sweep time Sweep time Frequency sweep example Check In phase sweep, the start phase setting is the oscillation start phase, and the...
Page 134 4.8 Setting and Operation of Sweep ◼ How to use manual and remote triggers Manual trigger operation and remote trigger operation is effective, regardless of the trigger source setting. The [Start] soft key and TRIG key can be used for manual trigger operation. However, in the case of WF1982, the TRIG key only works on the channel side where the ☞...
Page 135 4.8 Setting and Operation of Sweep o) To output the sweep start value When the [SttState] soft key is pressed, the state becomes the sweep start value output state. You can check the state of the equipment under test from the sweep start value. The [SttState] soft key is displayed in the output state for the sweep start value or stop value.
Page 136 4.8 Setting and Operation of Sweep ◼ When [SwpSync+Mkr] is selected The rising of sweep synchronous output is a marker signal. The sweep synchronous output is low until it reaches the marker value from the sweep start value. The sweep synchronization output does not change on the return path of a shuttle sweep.
Page 137 4.8 Setting and Operation of Sweep Continuous sweep One-way Shuttle Marker Stop value Stop value value Marker value Sweep value Start value Start value First half Sweep between First half start between Synchronization value start value and stop signal [SwpSync] and stop value is (marker disabled)
Page 138 4.8 Setting and Operation of Sweep ◼ Sweep start (pin 14) Falling input to pin 14 starts the sweep. The sweep will restart from the beginning even if it is already running. In the case of a single sweep or a gated single sweep, the sweep will start from the beginning when a trigger is received.
Page 139: Setting Frequency Sweep
4.8 Setting and Operation of Sweep 4.8.4 Setting Frequency Sweep For details on the sweep setting screen and common operation method, see P.4-80 and P.4-83 Frequency sweep example Examples of a continuous sweep and linear shuttle. Shuttle sweep Stop value Sweep value Start value Sweep time...
Page 140 4.8 Setting and Operation of Sweep • Sweep Mode [SwpMode] ☞ Select from continuous, single, and gated single. P.4-84 • Sweep function [SwpFctn] ☞ Select from one-way/shuttle and linear/log. P.4-84 This can be set with center frequency [Center] and span frequency [Span], instead of start ☞...
Page 141: Setting Phase Sweep
4.8 Setting and Operation of Sweep 4.8.5 Setting Phase Sweep For details on the sweep setting screen and the common operation method, see P.4-80 and P.4-83. Stop value Sweep value Examples of a continuous sweep and linear shuttle. Shuttle sweep Stop value Sweep value Start value...
Page 142 4.8 Setting and Operation of Sweep • Start phase [Start] • Stop phase [Stop] • Sweep time [Time] ☞ Time to change from the start phase to stop phase. P.4-83 • Sweep Mode [SwpMode] ☞ Select from continuous, single, and gated single. P.4-84 •...
Page 143: Setting Amplitude Sweep
4.8 Setting and Operation of Sweep 4.8.6 Setting Amplitude Sweep For details on the sweep setting screen and common operation method, see P.4-80 and P.4-83. Amplitude sweep example Examples of a continuous sweep and linear shuttle. Shuttle sweep Stop value Sweep value Start value Sweep time...
Page 144 4.8 Setting and Operation of Sweep ☞ Select from one-way, shuttle. P.4-84 This can be set with center amplitude [Center] and span amplitude [Span], instead of start ☞ amplitude and stop amplitude. P.4-83 When the sweep mode is single or gated single, it is necessary to set the trigger condition ☞...
Page 145: Setting Dc Offset Sweep
4.8 Setting and Operation of Sweep 4.8.7 Setting DC Offset Sweep For details on the sweep setting screen and common operation method, see P.4-80, P.4-83. DC offset sweep example Examples of a continuous sweep and linear shuttle. Shuttle sweep Stop value Sweep value Start value Sweep time...
Page 146 4.8 Setting and Operation of Sweep • Sweep function [SwpFctn] ☞ Select from one-way, shuttle. P.4-84 This can be set with center DC offset [Center] and span DC offset [Span], instead of start DC ☞ offset and stop DC offset. When the sweep mode is single or gated single, it is necessary to set the trigger condition [Trig].
Page 147: Setting Duty Sweep
4.8 Setting and Operation of Sweep 4.8.8 Setting Duty Sweep For details on the sweep setting screen and common operation method, see P.4-80 and P.4-83. Duty sweep example Examples of a continuous sweep and linear shuttle. Shuttle sweep Stop value Sweep value Start value Sweep time...
Page 148 4.8 Setting and Operation of Sweep • Sweep Mode [SwpMode] ☞ Select from continuous, single, and gated single. P.4-84 • Sweep function [SwpFctn] ☞ Select from one-way, shuttle. P.4-84 This can be set with center duty [Center] and span duty [Span], instead of start duty and stop duty. ☞...
Page 149: Setting And Operation Of Burst
4.9 Setting and Operation of Burst Setting and Operation of Burst 4.9.1 Burst Oscillation Types (Burst mode) The following four types of burst oscillations are available. • Auto burst Repeats oscillating and stopping automatically with each specified wave number. A trigger signal is ☞...
Page 150 4.9 Setting and Operation of Burst Page 3 of the setting screen: Screen for Setting Bursts Settings differ depending on the burst mode. This is explained for each burst mode. Page 4 of the setting screen: Screen for setting the modulation function and synchronization/sub output terminal The following figure shows an example with FM selected as the modulation type.
Page 151 4.9 Setting and Operation of Burst  Internal modulation frequency [ModFreq] ☞ This is the frequency of the internal modulation source. P.4-67 This item is not available when the modulation function is off or set to external modulation.  Internal modulation phase [ModPhs]/Sub waveform phase [SubPhs] This is the phase of the internal modulation source when the modulation function is turned on and set to internal modulation.
Page 152: Auto Burst
4.9 Setting and Operation of Burst 4.9.3 Auto burst This repeats oscillating and stopping automatically with each specified wave number. A trigger signal is not necessary. Auto burst example Mark wave number (oscillation wave number): 3 waves, space wave number (stop oscillation wave number): 2 waves, oscillation start/stop phase: 30 degrees, stop level: In case of Off.
Page 153 4.9 Setting and Operation of Burst  Mark wave number [Mark] This is the wave number of oscillation. This can be set in 0.5 cycle units. Usually, set this to 1 cycle unit.  Space wave number [Space] This is the wave number to stop oscillation. This can be set in 0.5 cycle units. Usually, set this to 1 cycle unit.
Page 154 4.9 Setting and Operation of Burst ◼ When [Sync] is selected A signal with TTL level which rises at the reference phase of the waveform is output from the synchronization/sub-output terminal. Synchronization signal Output signal ◼ When [BrstSync] is selected A signal with TTL level which is synchronized with the burst oscillation is output from the synchronization/sub-output terminal.
Page 155: Trigger Burst
4.9 Setting and Operation of Burst 4.9.4 Trigger burst This performs oscillation with the specified wave number e very time a trigger is accepted. Trigger burst example Mark wave number (oscillation wave number): 4 waves, oscillation start/stop phase: 30 degrees, stop level: In case of Off.
Page 156 4.9 Setting and Operation of Burst Screen for trigger burst setting Set the burst mode to [Trigger] Mark wave number Trigger delay Trigger setting Stop level  Burst mode [BrstMode] Set the burst mode. This sets the trigger burst [Trigger]. ...
Page 157 4.9 Setting and Operation of Burst Trigger setting for trigger burst Internal trigger oscillator, external signal, manual trigger key operation, and remote trigger can be used as a trigger. When a trigger is received, the Triggered lamp on the left of the TRIG key lights up. Set the trigger source in trigger [Trig] on page 2 of the setting screen ◼...
Page 158 4.9 Setting and Operation of Burst To output a burst synchronous signal → Synchronous output setting Set this in synchronization output [SubOut] on page 3 of the setting screen. Select from the following table. Modulation function is on and Modulation function is off or internal modulation external modulation Waveform reference phase...
Page 159 4.9 Setting and Operation of Burst How to use stop level The level while oscillation is stopped is usually set by the oscillation start/stop phase. It is also possible to set it by the ratio to the full scale of the amplitude independently. Set the stop level [StpLvl] to on [On] on page 2 of the setting screen, and set the level as a % value.
Page 160: Gate Oscillation
4.9 Setting and Operation of Burst 4.9.5 Gate Oscillation This performs oscillation in an integer cycle or half-cycle unit while the gate is on. Gate oscillation example Oscillation start/stop phase: 30 degrees, Oscillation stop unit: 1 cycle, Stop level: In case of Off. The oscillation is stopped when the oscillation start/stop phase is reached after the gate signal turns off.
Page 161 4.9 Setting and Operation of Burst  Trigger [Trig] This is the trigger condition (gate condition). Select a trigger source from internal and external. ☞ P.4-115  Stop level [StpLvl] This is the signal level while oscillation is stopped. Set the level by specifying Off or On. ☞...
Page 162 4.9 Setting and Operation of Burst ◼ How to perform gate oscillation with a remote trigger Gate oscillation cannot be performed directly from external control. This is because the gate signal will conflict with the manual trigger, trigger input, etc. However, operation equivalent to gate oscillation can be performed by using a trigger burst.
Page 163 4.9 Setting and Operation of Burst ◼ When [BrstSync] is selected A signal with TTL level which is synchronized with the gate oscillation is output from the synchronization/sub-output terminal. It is low during oscillation, and high while oscillation is stopped, as show in the following figure. Note that it is different from a gate signal. When a signal under burst is observed with an oscilloscope or similar device, it can be used as a trigger signal of the oscilloscope.
Page 164 4.9 Setting and Operation of Burst To oscillate in half cycle → Oscillation stop unit as half cycle When you want to stop oscillation every half cycle, set the oscillation stop unit [OscStop] to half cycle [HalfCycle] on page 2 of the setting screen. Usually, set this to 1 cycle [Cycle]. When it is set to 1 cycle [Cycle], the oscillation has an integer cycle.
Page 165 4.9 Setting and Operation of Burst Noise gate oscillation Since noise has no cycle, the gate On zone becomes the oscillation zone directly, and the gate Off zone becomes the oscillation zone directly. In addition, since noise has no phase, a stop level setting is always effective.
Page 166: Triggered Gate Oscillation
4.9 Setting and Operation of Burst 4.9.6 Triggered Gate Oscillation Gate oscillation that turns the gate On/Off every time a trigger is accepted. Triggered gate oscillation example Oscillation start/stop phase: 30 degrees, Oscillation stop unit: 1 cycle, Stop level: In case of Off. The oscillation is stopped when the oscillation start/stop phase is reached after the gate signal turns off.
Page 167 4.9 Setting and Operation of Burst Screen for triggered gate oscillation setting Set the burst mode to [Trigger] Number of waves to stop oscillation Trigger setting Stop level  Burst mode [BrstMode] Set the burst mode. This sets the triggered gate oscillation [TrigGate]. ...
Page 168 4.9 Setting and Operation of Burst Trigger setting of triggered gate oscillation Internal trigger oscillator, external signal, manual trigger key operation, and remote trigger can be used as a trigger. When a trigger is received, the Triggered lamp on the left of the TRIG key lights up. Set the trigger source in trigger [Trig] on page 2 of the setting screen .
Page 169 4.9 Setting and Operation of Burst To output a burst synchronization signal → Synchronous output setting Set this in synchronization output [SubOut] on page 3 of the settin g screen. Select from the following table. Modulation function is on and Modulation function is off or internal modulation external modulation...
Page 170 4.9 Setting and Operation of Burst To oscillate in half cycle → Oscillation stop unit as half cycle When you want to stop oscillation every half cycle, set the oscillation stop unit [OscStop] to half cycle [HalfCycle] on page 2 of the setting screen. Usually, set this to 1 cycle [Cycle]. When it is set to 1 cycle [Cycle], the oscillation has an integer c ycle.
Page 171: To Use The Synclator Function
4.10 To Use the Synclator Function 4.10 To Use the Synclator Function 4.10.1 Synclator The function to output a waveform with the same frequency as that of an external input signal is called the synclator function. It is capable of conversion, smoothing, and phase shift of waveforms and frequency division and multiplication ratio of the input frequency.
Page 172 4.10 To Use the Synclator Function point format, the set range limit value of frequency is the upper limit.  Rate of change of frequency of input signal Locking is not possible for an input signal with which the rate of change of frequency will exceed about 5 kHz/s.
Page 173: Setting Procedure
4.10 To Use the Synclator Function 4.10.4 Setting procedure To turn the synclator on Select the [Synclator] field on the top right of the Basic screen and then press the ENTER key to enable selection of the synchronization source of the synclator. For WF1981, it is fixed to Ext.
Page 174: Using Sub Waveforms
4.11 Using Sub Waveforms 4.11 Using Sub Waveforms A waveform that differs from the waveform output that is output from the synchronization/sub -output BNC terminal is called a sub waveform. Although there are limitations compared to waveform output, such as a frequency range of 0 to 5 MHz and output voltage range of -3.3 V to +3.3 V/open, you can use a sub waveform as a two-phase output oscillator with the WF1981 or a maximum four-phase output oscillator with the WF1982.
Page 175: To Set The Sub Waveform Amplitude
4.11 Using Sub Waveforms 4.11.5 To Set the Sub Waveform Amplitude Set the sub waveform amplitude [SubAmp] on page 4 of the Oscillator setting screen. The maximum total value of AC amplitude and DC offset is restricted to ±3.3 V/open. For example, when the AC amplitude is 1 Vp-p/open, DC offset is restricted to the range from -2.8 V/open to +2.8 V/open.
Page 176 4.11 Using Sub Waveforms MEMO WF1981/WF1982 4-130...
Page 177: Saving And Recalling Settings
5. Saving and Recalling Settings Procedure to Save Settings ....................5-2 Procedure to Recall Settings ....................5-5 To Rename Setting Memory ....................5-7 To Return Saved Settings to Initial Settings ............... 5-8 USB Flash Drive Operations ....................5-8 WF1981/WF1982...
Page 178: Procedure To Save Settings
5.1 Procedure to Save Settings You can save the current setting condition in the setting memory, and call it to use later. Settings are saved on the Store Settings screen and recalled on the Recall Settings screen. When the power is resumed after a power failure, WF1981/WF1982 will load the contents of the ☞...
Page 179: To Save To Usb Flash Drive
5.1 Procedure to Save Settings When the [Store] soft Press the [Store] soft key to open the key is pressed, the Select [OK], and then dialog box to confirm the save operation. dialog box to confirm press the ENTER key the save operation is Select the [Wave] field and then press the to save the settings.
Page 180 5.1 Procedure to Save Settings Specify the internal memory number of the Specify the name of the save source in the [Internal Mem No.] field. file to be saved. Specify the name of the file to save to USB Flash Drive in the [Name] field. Press the [OK] soft key to start saving.
Page 181: Procedure To Recall Settings
5.2 Procedure to Recall Settings Procedure to Recall Settings 5.2.1 To Recall from the Unit's Internal Memory Press the MENU key to open the top menu. Then, select [Memory]. The Memory screen opens. In the top menu, select [Memory] Select [Internal Memory No.] on the top right of the screen, and then press the ENTER key to open the To load from the unit's internal memory, input field of the memory number.
Page 182: To Recall From Usb Flash Drive
5.2 Procedure to Recall Settings 5.2.2 To recall from USB Flash Drive Press the MENU key to open the top menu. Then, select [Memory]. The Memory screen opens. In the top menu, select [Memory] Select a file in the recall source. To recall settings saved to USB Flash Drive, first connect the USB Flash Drive to the unit, then select the USB tab on the far left of the...
Page 183: To Rename Setting Memory
5.3 To Rename Setting Memory To Rename Setting Memory As with the save operation, press the [Rename] soft key after setting the setting memory number. The input field of the setting memory name is opened. Select the digit to be changed with the right or left arrow keys, and then use the up or down When the [Rename] arrow keys or the modify knob to change the...
Page 184: To Return Saved Settings To Initial Settings
5.4 To Return Saved Settings to Initial Settings To Return Saved Settings to Initial Settings As with the save operation, press the [Clear] soft key after setting the setting memory number. The dialog box to confirm the initialization operation is opened. To initialize the settings, select [OK], and then press the ENTER key.
Page 185: To Change The Current Folder
5.5 USB Flash Drive Operations 5.5.2 To Change the Current Folder When working with USB flash drive, the saving or recall of settings applies to the files in the c urrent folder. To move to the folder directly above Select "..¥" in the file list and press the [Enter] soft key. To move to a folder directly below Select the name of the folder you wish to move to from the file list and press the [Enter] soft key.
Page 186 5.5 USB Flash Drive Operations MEMO WF1981/WF1982 5-10...
Page 187: Parameter-Variable Waveforms
Parameter-variable Waveforms Overview ..........................6-2 Meaning of Each Parameter and Waveform Examples ............. 6-3 WF1981/WF1982...
Page 188: Overview
6.1 Overview Overview With respect to complicated waveforms such as those that cannot be created unless they are arbitrary waveforms, any waveform with variables (parameters) that can be changed easily is called a parameter-variable waveform. ☞ The waveform to output can be selected on the parameter-variable waveform selection screen ( P.4- 59).
Page 189: Meaning Of Each Parameter And Waveform Examples
6.2 Meaning of Each Parameter and Waveform Examples Meaning of Each Parameter and Waveform Examples The following provides an overview, explains the meaning of each parameter, and gives examples for each waveform. The waveform examples display one cycle of the waveform drawn in the waveform memory. The polarity of the waveform is normal.
Page 190: Steady Sine Group
6.2 Meaning of Each Parameter and Waveform Examples 6.2.1 Steady Sine Group Unbalanced sine wave (Unbalanced Sine) ◼ Overview Waveform for which the amplitudes of the first half and second half of the sine wave can be changed independently. ◼ Application examples •...
Page 191 6.2 Meaning of Each Parameter and Waveform Examples Clipped sine wave (Clipped Sine) Clip=30% ◼ Overview Waveform acquired by clipping the top and bottom of the amplitude of a sine wave +1(+FS) ◼ Application examples 100% • Simulates a waveform clipped by an input clamp circuit •...
Page 192 6.2 Meaning of Each Parameter and Waveform Examples CF controlled sine wave (CF Ctrl Sine) ◼ Overview Waveform acquired by extracting only the neighborhood of 90° and 270° of a sine wave and expanding the amplitude. ◼ Application examples • Simulates the current waveform of a condenser input rectifier circuit ◼...
Page 193 6.2 Meaning of Each Parameter and Waveform Examples Angle controlled sine wave (Angle Ctrl Sine) ◼ Overview Waveform acquired by extracting only the front or back portion of each half cycle of a sine wave. ◼ Application examples • Simulates a thyristor-controlled waveform ◼...
Page 194 6.2 Meaning of Each Parameter and Waveform Examples Staircase sine wave (Staircase Sine) ◼ Overview This is a staircase shaped sine wave. The horizontal axis and vertical axis are divided at an equal interval. ◼ Application examples • Simulates the pseudo sine wave output waveform of an uninterruptible power supply (UPS), etc.
Page 195 6.2 Meaning of Each Parameter and Waveform Examples Multi-cycle sine wave (Multi-Cycle Sine) ◼ Overview Waveform acquired by continuing the sine wave for multiple cycles. ◼ Application examples • Burst wave substitution ◼ Meaning of each parameter Cycle=3 The example shows the case where the amplitude range is ±FS.
Page 196: Transient Sine Group
6.2 Meaning of Each Parameter and Waveform Examples 6.2.2 Transient Sine Group On-phase controlled sine wave (On-Ph Ctrl Sine) ◼ Application examples Sine wave with a slope into the on state. Application examples • Simulates the output waveform of an AC power supply with a restricted rising and falling time ◼...
Page 197 6.2 Meaning of Each Parameter and Waveform Examples Off-phase controlled sine wave (Off-Ph Ctrl Sine) ◼ Overview Sine wave with a slope into the off state. ◼ Application examples • Simulates the output waveform of an AC power supply with a restricted rising and falling time ◼...
Page 198 6.2 Meaning of Each Parameter and Waveform Examples Chattering-on sine wave (Chattering-On Sine) ◼ Overview Sine wave with chattering into the on state. ◼ Application examples • Simulates an AC power supply output waveform which follows the chattering pattern of a switch or relay during the start of output.
Page 199 6.2 Meaning of Each Parameter and Waveform Examples Chattering-off sine wave (Chattering-Off Sine) ◼ Overview Sine wave with chattering into the off state. ◼ Application examples • Simulates an AC power supply output waveform which follows the chattering pattern of a switch or relay during output shut off.
Page 200: Pulse Group
6.2 Meaning of Each Parameter and Waveform Examples 6.2.3 Pulse Group Gaussian pulse ◼ Overview Waveform with a Gaussian distribution. ◼ Meaning of each parameter +1(+FS) The example shows the case where the amplitude range 0.6065×FS is 0/+FS. • Standard deviation (Sigma) This is σ...
Page 201 6.2 Meaning of Each Parameter and Waveform Examples Lorentz pulse ◼ Overview Lorentz waveform. ◼ Meaning of each parameter +1(+FS) The example shows the case where the amplitude range is 0/+FS. 0.5×FS • Half width The half value width of the Lorentz function. Variable range: 0.01% to 100.00% of basic period Peak value is fixed to +FS at the center of the horizontal axis.
Page 202 6.2 Meaning of Each Parameter and Waveform Examples Haversine ◼ Overview pulse. This is similar to a waveform of a sine wave from the -90° to 270° range. ◼ Application examples • Simulates an impact test device waveform ◼ Meaning of each parameter +1(+FS) The example shows the case where the amplitude range is 0/+FS.
Page 203 6.2 Meaning of Each Parameter and Waveform Examples Half-sine pulse ◼ Overview Sine wave half cycle pulse. A half cycle waveform of a sine wave from the 0° to 180° range. ◼ Meaning of each parameter +1(+FS) The example shows the case where the amplitude range is 0/+FS.
Page 204 6.2 Meaning of Each Parameter and Waveform Examples Trapezoid pulse ◼ Overview Trapezoid waveform pulse. UpperBase=20 ◼ Meaning of each parameter +1(+FS) The example shows the case where the amplitude range is 0/+FS. • Slope width (RiseFall) The width of each oblique side. Variable range: 0.00% to 50.00% of basic period •...
Page 205 6.2 Meaning of Each Parameter and Waveform Examples Sin(x)/x ◼ Overview Sin(x)/x waveform. This is called the sinc function. ◼ Meaning of each parameter +1(+FS) The example shows the case where the amplitude range is ±FS. • Number of zero crossings (ZeroCross) The number of zero crossings on one side.
Page 206: Transient Response Group
6.2 Meaning of Each Parameter and Waveform Examples 6.2.4 Transient Response Group Exponential rise ◼ Overview First order LPF step response waveform. ◼ Application examples • Simulates a first order lag system's step output waveform ◼ Meaning of each parameter +1(+FS) The example shows the case where the amplitude 0.632×FS...
Page 207 6.2 Meaning of Each Parameter and Waveform Examples Exponential fall ◼ Overview First order HPF step response waveform. ◼ Application examples • Simulates a first order system's step output waveform ◼ Meaning of each parameter +1(+FS) The example shows the case where the amplitude range is 0/+FS.
Page 208 6.2 Meaning of Each Parameter and Waveform Examples Second order LPF step response (2nd Ord LPF Step) ◼ Overview Second order LPF step response waveform. ◼ Application examples • Simulates the step output waveform of a transmission system accompanied by ringing and over shooting ◼...
Page 209 6.2 Meaning of Each Parameter and Waveform Examples Damped oscillation ◼ Overview Oscillation waveform with an amplitude that dampens exponentially. An oscillation waveform with an amplitude that increases exponentially can also be created. ◼ Application examples Simulates a pulse response waveform with oscillation. ◼...
Page 210: Surge Group
6.2 Meaning of Each Parameter and Waveform Examples 6.2.5 Surge Group Oscillation surge ◼ Overview Simulates a surge waveform with damped oscillation. The step response waveform of a cascade connection circuit with a first order HPF and a second order LPF. ◼...
Page 211 6.2 Meaning of Each Parameter and Waveform Examples Pulse surge ◼ Overview Simulates a surge waveform. Does not have an oscillation component. ◼ Application examples • Simulates the transient voltage waveform of a car battery ◼ Meaning of each parameter +1(+FS) 0.9×FS The example shows the case where the amplitude...
Page 212: Other Group
6.2 Meaning of Each Parameter and Waveform Examples 6.2.6 Other group Trapezoid wave with offset ◼ Overview Trapezoid wave with an offset in the amplitude direction. ◼ Application examples • Simulates the various voltages and current waveforms of a switching power supply circuit ◼...
Page 213 6.2 Meaning of Each Parameter and Waveform Examples Half-sine edge pulse ◼ Overview Pulse wave with variable rising time, falling time, and pulse width duty. The rising and falling shapes have the same half sine (half cycle of a sine wave) shape as a standard pulse wave.
Page 214 6.2 Meaning of Each Parameter and Waveform Examples Bottom referenced ramp ◼ Overview +1(+FS) Ramp wave with bottom level as reference. ◼ Meaning of each parameter The example shows the case where the amplitude range is 0/+FS. • Symmetry (Symm) The ratio of the rising portion.
Page 215 6.2 Meaning of Each Parameter and Waveform Examples Double pulse ◼ Overview This is a pulse of 2 waves. Rising and falling are both linear. UpperBase2=10% ◼ Application examples UpperBase1=20% • Measure the switching characteristics of MOSFET ◼ Meaning of each parameter +1(+FS) The example shows the case where the amplitude range is 0/+FS.
Page 216 6.2 Meaning of Each Parameter and Waveform Examples MEMO WF1981/WF1982 6-30...
Page 217: Creating Arbitrary Waveforms
Creating Arbitrary Waveforms Basics ..........................7-2 Display Procedure and Overview of Screen for Creating/Editing Arbitrary Waveforms ..7-5 Creating New Arbitrary Waveform ..................7-7 Example of Creating Simple Arbitrary Waveform ............... 7-8 Outputting Created Arbitrary Waveform ................7-9 Saving Created Arbitrary Waveform ................. 7-10 To Retrieve the Saved Arbitrary Waveform ..............
Page 218: Basics
7.1 Basics Basics There are mainly the following two methods to create arbitrary waveforms: • Enter waveform data from the panel. • Use the arbitrary waveform editing software to create arbitrary waveforms on a personal computer. This section describes the method to create arbitrary waveforms by performing operations on the panel of the main unit.
Page 219 7.1 Basics cannot be set. In addition, when the sample rate is 109 MS/s or higher or less than 15 mS/s, the jitter reduction effect is dampened gradually. The approximate relationship between sample rate and jitter is shown in the table below. Table 7-1 Arbitrary waveform sample rate and jitter in array format Sample rate ≤109...
Page 220 7.1 Basics ◼ Selection of arbitrary waveforms to be output When setting a waveform as an arbitrary waveform in the Oscillator setting screen, you can select a waveform in internal memory or the edit memory. The selected waveform is written to the output waveform memory with a maximum 32 Mi words length.
Page 221: Display Procedure And Overview Of Screen For Creating/Editing Arbitrary Waveforms
7.2 Display Procedure and Overview of Screen for Creating/Editing Arbitrary Waveforms Display Procedure and Overview of Screen for Creating/Editing Arbitrary Waveforms An arbitrary waveform is created or edited in the ARB Edit screen. Press the MENU key to open the top menu. Select [ARB Edit] and then press the ENTER key.
Page 222 7.2 Display Procedure and Overview of Screen for Creating/Editing Arbitrary Waveforms ◼ Graph display Graph display shows the waveform being created in an enlarged state. The X and Y values of the one selected control point are displayed. As with the list display, the shape of the waveform is created by setting the X and Y values for each control point.
Page 223: Creating New Arbitrary Waveform
7.3 Creating New Arbitrary Waveform Creating New Arbitrary Waveform There are the following three methods to create new arbitrary waveforms: • Create a new arbitrary waveform completely from the beginning First, press the [New] soft key to clear the edit memory. Then, enter the control points. The next section describes an example of creation.
Page 224: Example Of Creating Simple Arbitrary Waveform
7.4 Example of Creating Simple Arbitrary Waveform Example of Creating Simple Arbitrary Waveform In this section, we will actually create a simple arbitrary waveform. The procedure is explained using list format display. The arbitrary waveform to be created is a triangular wave as shown below. The number of control points of this waveform is three, but here we will start with two points and then change to three points part way through.
Page 225: Outputting Created Arbitrary Waveform
7.5 Outputting Created Arbitrary Waveform Check ・ The X value can be changed within a range between the control point just before the X value and the control point just after the X value. ・ The Y value is rounded to 16-bit resolution. ・...
Page 226: Saving Created Arbitrary Waveform
7.6 Saving Created Arbitrary Waveform Saving Created Arbitrary Waveform Press the [Memory] soft key to switch to the screen for recalling, saving. and file operations. On this screen, you can select the unit's internal memory or USB flash drive as the save destination.
Page 227: Saving To Usb Flash Drive
7.6 Saving Created Arbitrary Waveform 7.6.2 Saving to USB Flash Drive Save the contents of the edit memory to USB Flash Drive. When USB at the bottom left of the screen is selected, the data will be saved to the USB Flash Drive.
Page 228 7.6 Saving Created Arbitrary Waveform File time stamps This instrument does not have a built-in battery. Therefore, the time of the time stamp is off from the actual date and time by the amount of time that the instrument was not energized. The time stamp of a file created is the result of adding the amount of time that the instrument was energized to the date and time that the instrument made the adjustments.
Page 229: To Retrieve The Saved Arbitrary Waveform
7.7 To Retrieve the Saved Arbitrary Waveform To Retrieve the Saved Arbitrary Waveform Press the [Memory] soft key to switch to the screen for recalling, saving. and file operations. The internal memory or USB Flash Drive may be selected as the retrieve source on this screen.
Page 230: To Retrieve From Usb Flash Drive
7.7 To Retrieve the Saved Arbitrary Waveform 7.7.2 To Retrieve from USB Flash Drive Save the arbitrary waveform data in USB Flash Drive to the internal memory. However, waveforms in array format cannot be copied to the edit memory. When USB at the bottom left of the screen is selected, the data will be saved to the internal memory.
Page 231: File Operations
7.8 File Operations File Operations Perform the operations of deleting and renaming the arbitrary waveform data in internal memory and also deleting and renaming the arbitrary waveform data and creating, deleting, and renaming folders in USB Flash Drive on the Memory screen of ARB Edit. Press the [Memory] soft key to switch to the screen for recalling, saving.
Page 232: To Rename
7.8 File Operations Specify the number of the file you want to delete. When the target is a file or folder in USB Flash Drive, a screen such as the one on the left will be displayed. Folders have "¥" at the end of the name. When a folder is selected, pressing the [Enter] soft key makes that folder the current folder.
Page 233 7.8 File Operations The name of the selected file or Select the file/folder When the target is a file or folder in USB folder is displayed. by changing here. Flash Drive, a screen such as the one on the left will be displayed. Folders have "¥"...
Page 234: To Create A Folder In Usb Flash Drive
7.8 File Operations 7.8.3 To Create a Folder in USB Flash Drive Folders have "¥" at the end of the name. When a folder is selected, pressing the [Enter] soft key makes that folder the current folder. ".. ¥" indicates the folder one level up. Select the [New Folder] button and then press the ENTER key.
Page 235: Identifying Memory Space Required For Saving Arbitrary Waveforms
7.9 Identifying Memory Space Required for Saving Arbitrary Waveforms Identifying Memory Space Required for Saving Arbitrary Waveforms A maximum of approximately 4 Gi words can be saved to the unit's internal non-volatile memory. The memory capacity (K-byte) required when saving an arbitrary waveform in the array format and control point format, respectively, is calculated by the following formula.
Page 236 7.9 Identifying Memory Space Required for Saving Arbitrary Waveforms MEMO WF1981/WF1982 7-20...
Page 237: Convenient Use Of 2-Channel Equipment
8. Convenient Use of 2-channel Equipment (WF1982) Outline ..........................8-2 Copying Settings between Channels ................. 8-3 Unifying Settings of 2 Channels ..................8-5 Synchronizing Phase between Channels ................8-6 Keeping Frequencies for Both Channels Set to Same Value (2-Channel Coordination: 2Phase) ..........................
Page 238: Outline
8.1 Outline Outline You can use 2-channel equipment like the WF1982as not only two oscillators with each channel independent but also with the settings and operations coordinated between the two channels. Functions specific to 2-channel equipment are as follows: • Parameter copy function The settings of one channel can be copied to the other channel.
Page 239: Copying Settings Between Channels
8.2 Copying Settings between Channels Copying Settings between Channels The settings can be copied between channels in the Utility screen. In the Utility screen, select [Parameter Copy] and then press the ENTER key. In the Utility screen, select [Parameter Copy] and then After the Parameter copy window opens, select press the ENTER key.
Page 240 8.2 Copying Settings between Channels When the above setting is completed, select [OK] at the bottom of the window, and then press the ENTER key. The copy operation is performed. When you do not want to copy, select [Cancel] at the bottom of the window and press the ENTER key, or press the CANCEL key.
Page 241: Unifying Settings Of 2 Channels
8.3 Unifying Settings of 2 Channels Unifying Settings of 2 Channels To unify the settings of 2 channels, set the 2-channel equivalence setting function (CH LINK) to On in the Utility screen. This function is enabled until the 2-channel equivalence setting function is reset to off. In the Utility screen, select [Multi CH] and press the ENTER key.
Page 242: Synchronizing Phase Between Channels
8.4 Synchronizing Phase between Channels Synchronizing Phase between Channels The 2-channel equal value setting function is a function that sequentially sets the same value to both channels. Even if the frequency and phase are set to the same value, the phase relationship between the output waveforms of the two channels will change each time depending on the relatio nship between frequency and timing.
Page 243 8.4 Synchronizing Phase between Channels stop the oscillation once. Item Restriction Waveform Invalid for Noise and DC. Modulation Invalid for FM and FSK. Sweep Oscillation Mode Invalid for frequency sweep. Invalid for gated single sweep. Burst Oscillation Mode Invalid . The delay time varies depending on the output range.
Page 244: Keeping Frequencies For Both Channels Set To Same Value (2-Channel Coordination: 2Phase)
8.5 Keeping Frequencies for Both Channels Set to Same Value (2-Channel Coordination: 2Phase) Keeping Frequencies for Both Channels Set to Same Value (2- Channel Coordination: 2Phase) If the channel mode is [2Phase], you can change the frequency with the frequencies for both channels kept to the same value while the synchronization relationship is kept.
Page 245 8.5 Keeping Frequencies for Both Channels Set to Same Value (2-Channel Coordination: 2Phase) ◼ Operational restrictions There are the restrictions shown in the following table to keep the synchronization relationship with the same frequency: Item Restriction Waveform Disabled for Noise and DC. Modulated Both CHs are FM.
Page 246: Keeping Frequency Difference Constant (2-Channel Coordination: 2Tone)
8.6 Keeping Frequency Difference Constant (2-Channel Coordination: 2Tone) Keeping Frequency Difference Constant (2-Channel Coordination: 2Tone) If the channel mode is constant frequency difference [2Tone], you can change the frequency with the frequency difference between both channels kept constant. In coordination with the change of the frequency of channel 1, the frequency of channel 2 is automatically changed.
Page 247 8.6 Keeping Frequency Difference Constant (2-Channel Coordination: 2Tone) ◼ Operational restrictions There are the restrictions shown in the following table to keep the frequency difference: Item Restriction Waveform Disabled for Noise and DC Modulated Both CHs are FM. Peak deviation is common. oscillation Modulation source is internal only.
Page 248: Keeping Frequency Ratio Constant (2-Channel Coordination: Ratio)
8.7 Keeping Frequency Ratio Constant (2-Channel Coordination: Ratio) Keeping Frequency Ratio Constant (2-Channel Coordination: Ratio) If the channel mode is constant frequency ratio [Ratio], you can change the frequency with the frequency ratio between both channels kept constant. In coordination with the change of the frequency of channel 1, the frequency of channel 2 is automatically changed.
Page 249 8.7 Keeping Frequency Ratio Constant (2-Channel Coordination: Ratio) ◼ Operational restrictions There are restrictions shown in the following table to keep the frequency ratio: Item Restriction Waveform Disabled for Noise and DC Modulated Both CHs are FM. Peak deviation follows the frequency ratio. oscillation Modulation source is internal only.
Page 250: Obtaining Differential Output (2-Channel Coordination: Differential)
8.8 Obtaining Differential Output (2-Channel Coordination: Differential) Obtaining Differential Output (2-Channel Coordination: Differential) If the channel mode is [Diff], you can change the setting with the differential output of both channels kept. In this 2-channels coordination mode, the DC offset setting is the same for channel 1 and channel 2. In coordination with the change of the setting of channel 1, the setting of channel 2 is automatically changed.
Page 251: Obtaining Double Output Voltage (2-Channel Coordination: Diff2)
8.9 Obtaining Double Output Voltage (2-Channel Coordination: Diff2) Obtaining Double Output Voltage (2-Channel Coordination: Diff2) With respect to the AC signal component, this is the same as [Diff] (differential) in the previous section. The DC offset setting is reversed polarity with channel 1 and channel 2. When the hot sides of CH1 and CH2 are used as the output, including DC, it is possible to obtain double the amount of output voltage (however, the output impedance is 100 Ω).
Page 252 8.9 Obtaining Double Output Voltage (2-Channel Coordination: Diff2) MEMO WF1981/WF1982 8-16...
Page 253: Synchronizing Multiple Units
Synchronizing Multiple Units Connection Procedure ......................9-2 Performing Synchronization ....................9-4 WF1981/WF1982...
Page 254: Connection Procedure
9.1 Connection Procedure Synchronous operation is possible not only with WF1981/WF1982 but also with series products WF1983/WF1984. A maximum of 12-phase oscillators (when 6 WF1982/WF1984 units are used) can be configured. Each phase can change phase and amplitude independently. Set the same frequency for all units and channels. Connection Procedure Here, the WF198x that will be the synchronization reference is called the primary unit.
Page 255 9.1 Connection Procedure primary unit secondary unit secondary unit secondary unit 10 MHz 10 MHz 10 MHz 10 MHz REF IN REF IN REF IN REF IN External reference 50 Ω BNC Tee BNC Tee can be used termination adapter adapter resistor ...
Page 256: Performing Synchronization
9.2 Performing Synchronization Performing Synchronization ◼ Before synchronization After connecting the primary unit and secondary units is finished, configure the settings as follows: Mrimary unit Set [Channel Mode] to [Indep] or [2Phase]  Select 2-channel independent operation or 2- Set 10MHz Ref (WF1982) Out to [Enable] phase operation (in the Utility screen, set the...
Page 257 9.2 Performing Synchronization Check that all secondary units operate based on the external frequency reference. If the [Ref] icon is lit without flashing on the status display area at the top of the screen, they operate based on the external frequency reference. If they operate based on the external frequency reference, the [Ref] icon is lit without flashing...
Page 258 9.2 Performing Synchronization ◼ Phase relationship after synchronous operation The oscillation phase for each channel is initialized by the synchronous operation. The phase difference of the output waveform appears as the difference of the phase setting for each channel. Even if synchronous operation is performed, the synchronization relationship will be lost if the frequency is changed later.
Page 259: Using External Frequency Reference
10. Using External Frequency Reference 10.1 Purpose of Using External Frequency Reference ............10-2 10.2 Connection and Usage Procedure of External Frequency Reference ......10-2 WF1981/WF1982 10-1...
Page 260: Purpose Of Using External Frequency Reference
10.1 Purpose of Using External Frequency Reference 10.1 Purpose of Using External Frequency Reference This product uses a built-in crystal oscillator as the frequency reference, but you can also use an external 10 MHz clock as the frequency reference. Generally, an external frequency reference is used for the following purposes: ...
Page 261 10.2 Connection and Usage Procedure of External Frequency Reference Note that, in all cases, the floating voltage should be limited to 42 Vpk (DC + AC peak) or lower to prevent electric shocks. ☞ For cautions on the floating ground connection, "3.3 Cautions on Floating Ground Connection".
Page 262 10.2 Connection and Usage Procedure of External Frequency Reference ◼ Enabling external frequency reference You can enable/disable the external frequency reference in the Utility screen. In the Utility screen, select [Ref Clock IO] and then press the ENTER key to display a dialog box.
Page 263: Using Sequence Oscillation
11. Using Sequence Oscillation 11.1 Sequence Oscillation ......................11-2 11.2 Sequence Oscillation Example ..................11-2 11.3 Basics ..........................11-4 11.4 In-Step Processing Flow ....................11-12 11.5 Setting and Operation Procedure ................... 11-13 11.6 Saving Created Sequence ....................11-18 11.7 Using the Saved Sequence .................... 11-20 11.8 File Operations .......................
Page 264: Sequence Oscillation
11.1 Sequence Oscillation 11.1 Sequence Oscillation Sequence oscillation is the operation to output while automatically changing the amplitude, frequency, and other parameters according to a predetermined procedure. For example, sequence oscillation can be used to output a triangle wave of 2 kHz and 2 Vp-p immediately after a sine wave of 1 kHz and 1 Vp-p has been output.
Page 265 11.2 Sequence Oscillation Example ends. In this example, the system waits for the sequence to start in the state of 0 V DC. [Time] and [Action] of Step 0 are enabled only when the sequence ends, and have no meaning here. They ☞...
Page 266: Basics
11.3 Basics 11.3 Basics This section describes the necessary information you should know when using the sequence oscillation. Difference between Sequence oscillation and normal oscillation (Oscillator). Normal oscillation (Oscillator) is the normal usage of generating various test signals mainly manually. On the other hand, sequence oscillation is an operation in which the DDS FP GA's built-in processor outputs signals while controlling various parameters instead of manual operation.
Page 267 11.3 Basics changes according to the status of the previous step. When the action setting is set to [Keep], you will not be able to set the parameter value. In Step 0, [Keep] cannot be selected.  Sweep [Sweep] The value changes linearly over the step time from the value immediately before to the value set in that step.
Page 268 11.3 Basics Phase at step end [StopPhs] Normally, when the prescribed step time has elapsed, the sequence moves on to the next step regardless of the reference phase. However, if you wish to set the sequence to move on to the next step after the completion of one cycle of waveform, it is possible to StopPhs setting specify the end phase (stop phase).
Page 269 11.3 Basics Similarly, the following figure shows examples in which the stop phase is specified and in which it is not specified when the amplitude is changed quickly. These are examples when the phase setting value and stop phase setting value are both 0°. In both cases, the phase is continuous at the transition of the steps.
Page 270 11.3 Basics Check When you wish to specify the start phase, set the previous step to DC. Frequency during DC or noise waveform output If the action of frequency is set to Sweep in the next step of DC or noise, the sweep begins from 1kHz in the next step.
Page 271 11.3 Basics ☞ this time. P.11-4  Stop phase: At the start of the sequence, the sequence waits for the reference phase specified here and then moves to the next step (normally Step 1). This setting is disabled for a square wave, arbitrary waveform, noise, and DC. ...
Page 272 11.3 Basics For an arbitrary waveform in array format, the waveform size transferred from the USB Flash Drive or external control is extended to a multiple of 32 words. For an arbitrary waveform in control point format, the size is allocated within the range of 16 Ki words to 1 Mi words according to the frequency for each step.
Page 273 11.3 Basics ☞ output terminal. For the step synchronization code, P.11-27. If LSB of the appropriate step synchronization code is set to H and output, it can be used as the trigger source to enable a simplified check of the sequence to be executed with an ☞...
Page 274: In-Step Processing Flow
11.4 In-Step Processing Flow 11.4 In-Step Processing Flow The following figure shows the flow of processing within one step. Start Output is performed according to the action setting during the specified step time. If the hold operation is performed during this time, the sequence is held and waits in the current output state until the resume operation is performed.
Page 275: Setting And Operation Procedure
11.5 Setting and Operation Procedure 11.5 Setting and Operation Procedure Create and edit a sequence in sequence oscillation. To switch to sequence oscillation Press the MENU key to open the top menu window. Then, select [Seq] and press the ENTER key. The dialog box to confirm the move to sequence oscillation is displayed.
Page 276 11.5 Setting and Operation Procedure First row (Graph screen) Go to the previous or next step number with [Step +1] or [Step –1]. Adjust the vertical-axis scale of graph display so that the scale does not become saturated with [AutoScale]. Make the sequence executable with [Compile].
Page 277 11.5 Setting and Operation Procedure The soft key items in this state are as follows: Soft keys in [Rdy] state Start sequence execution with [Start]. Return to the creating/editing sequence screen with [Edit]. The created or edited sequence will be cleared when the power is turned off, so save the sequence if it is needed.
Page 278 11.5 Setting and Operation Procedure The soft key items in this state are as follows: Soft keys in [Hold] state To execute an event branch Press the [EventBra] soft key in the [Run] or [Hold] state to execute an event branch. If the event branch is set to on in the step which is being executed at that moment, the sequence moves to the specified step.
Page 279 11.5 Setting and Operation Procedure order to avoid malfunctions caused by exogenous noise. ☞ For the multi-I/O connectors and their pin allocation, P.3-14 During external trigger input (BNC terminal), only the sequence start operation can be ☞ performed. P.11-10 The following operations can be performed. ◼...
Page 280: Saving Created Sequence
11.6 Saving Created Sequence 11.6 Saving Created Sequence 11.6.1 Saving to Internal Memory When the MENU key is pressed, the top menu opens. Then, select [Memory]. This opens the Memory screen. In the top menu, Select [Memory] Enter the sequence memory number of the save destination here.
Page 281: Saves To Usb Flash Drive
11.6 Saving Created Sequence 11.6.2 Saves to USB Flash Drive When the MENU key is pressed, the top menu opens. Then, select [Memory]. This opens the Memory screen. In the top menu, Select [Memory] Select the USB tab Select the USB tab at the bottom left of the screen and then press the ENTER key to set the save destination to USB Flash Drive.
Page 282: Using The Saved Sequence
11.7 Using the Saved Sequence 11.7 Using the Saved Sequence 11.7.1 To Retrieve from Internal Memory When the MENU key is pressed, the top menu opens. Then, select [Memory]. This opens the Memory screen. In the top menu, select [Memory] Enter the sequence memory number of the recall source here.
Page 283: To Retrieve From Usb Flash Drive
11.7 Using the Saved Sequence 11.7.2 To Retrieve from USB Flash Drive When the MENU key is pressed, the top menu opens. Then, select [Memory]. This opens the Memory screen. In the top menu, select [Memory] Select the USB tab Select the USB tab at the bottom left of the screen and then press the ENTER key to set the save destination to USB Flash Drive.
Page 284: File Operations
11.8 File Operations 11.8 File Operations Perform the operations of deleting and renaming the sequence data in internal memory and also deleting and renaming the sequence data and creating, deleting, and renaming folders in USB Flash Drive on the Memory screen. 11.8.1 To Delete Saved Sequence Data Specify the sequence number to be deleted.
Page 285: To Rename
11.8 File Operations 11.8.2 To Rename To rename arbitrary waveform data in internal memory or rename arbitrary waveform data or a folder in USB Flash Drive, use the [Rename] soft key. Specify the number of the target you want to rename. Specify the target with a number in the file number selection field at the top left of the screen...
Page 286: To Create A Folder In Usb Flash Drive
11.8 File Operations 11.8.3 To Create a Folder in USB Flash Drive Folders have "¥" at the end of the name. When a folder is selected, pressing the [Enter] soft key makes that folder the current folder. ".. ¥" indicates the folder one level up. Select the [New Folder] button and then press the ENTER key.
Page 287: Outline Of Screen
11.9 Outline of Screen 11.9 Outline of Screen ◼ Text display [Single] The step control parameters of one step and the intra-step channel parameters of one channel are displayed simultaneously. Common setting Step number Step control parameters Intra-step channel parameters ◼...
Page 288: Individual Descriptions Of Step Control Parameters
11.10 Individual Descriptions of Step Control Parameters ◼ Graph display [Graph] Graph display shows the trends along the step progress for four intra -step channel parameters. However, the trend shown is only for the case where the step progresses according to the step number from Step 0.
Page 289 11.10 Individual Descriptions of Step Control Parameters Stop phase [StopPhs] When this parameter is set to on, the reference phase at the end of that step can be specified. After the lapse of the specified step time, that step ends when the specified reference phase ☞...
Page 290 11.10 Individual Descriptions of Step Control Parameters MEMO WF1981/WF1982 11-28...
Page 291: Using User-Defined Units
12. Using User-defined Units 12.1 About User-defined Units ....................12-2 12.2 Display and Setting in User-defined Units ................ 12-2 12.3 Defining User-defined Units ....................12-2 WF1981/WF1982 12-1...
Page 292: About User-Defined Units
12.1 About User-defined Units 12.1 About User-defined Units You can set, for example, the frequency in units of rpm (number of rotations per minute) instead of Hz. You can also set a value converted to the mechanical deviation quantity or a value conve rted to the output voltage after the power amplifier output instead of voltage.
Page 293 12.3 Defining User-defined Units The user-defined unit setting window opens. Select the respective item and then press the ENTER key and configure the setting. Alternatively, you can open the input field by pressing the corresponding soft key. Setting target Unit name The user-defined unit Formula setting window opens...
Page 294 12.3 Defining User-defined Units Check When you use a user-defined unit, the setting resolution may be rough depending on the setting of the multiplier or offset. ◼ To set the frequency in rpm To display and set, for example, the frequency 1 Hz as 60 rpm, set the following and then press the [OK] key.
Page 295: Other Utility Settings
13. Other Utility Settings 13.1 Selecting Remote Interface [Remote] ................13-2 13.2 Display and Operation Sound Settings [System] ............. 13-3 13.3 Self-Diagnosis [Self Check] ....................13-3 13.4 Product Information Display [Information] ................ 13-4 WF1981/WF1982 13-1...
Page 296: Selecting Remote Interface [Remote]
13.1 Selecting Remote Interface [Remote] 13.1 Selecting Remote Interface [Remote] Select the external control interface from USB and LAN. ◼ USBTMC setting screen When you select USBTMC, the USB ID is displayed. There is no specific setting with USB. ◼ LAN setting screen When you select LAN, the MAC address and port address are displayed.
Page 297: Display And Operation Sound Settings [System]
In rare cases, an error may occur due to the effect of noise. If you encounter an error repeatedly, please contact NF Corporation or one of our representatives. WF1981/WF1982 13-3...
Page 298: Product Information Display [Information]
Total operation time (in hours) Number of times powered on ◼ Details of 2D barcode The information in the 2D barcode consists of our company name, model name, manufacturing number, device information, firmware version, and date last calibrated by NF Corporation WF1981/WF1982 13-4...
Page 299: Troubleshooting
14. Troubleshooting 14.2 Error Messages while Running..................14-3 14.3 Conflict Messages for Modulation ..................14-7 14.4 Sequence Compiler Message ..................14-8 14.5 When Suspect a Failure ....................14-9 WF1981/WF1982 14-1...
Page 300: Error Messages At Power-On
14.1 Error Messages at Power-on 14.1 Error Messages at Power-on At power-on, self-diagnosis is performed and an error message is displayed if there is any problem. If you encounter any failure, please contact NF Corporation or one of our representatives. Message Explanation There is a malfunction.
Page 301: Error Messages While Running
14.2 Error Messages while Running 14.2 Error Messages while Running Error messages are displayed while the product is running mainly when a setting exceeds the allowable output range. For example, when a ramp wave is output and you try to set the frequency to 30 MHz, an error is displayed and the frequency is set to the maximum frequency for a square wave.
Page 302 14.2 Error Messages while Running Number Message Explanation 3000 Function changed to Sine by Since 2-channel linked mode was selected changing Channel Mode when the waveform was noise or DC, the waveform of the corresponding channel was switched to a sine wave. 3001 Mode changed to Continuous Since 2-channel linked mode was selected in...
Page 303 14.2 Error Messages while Running Number Message Explanation 3012 Too narrow or too wide Duty If the duty is set too low or too high, the specified Amplitude amplitude may become small or the pulse may decrease or pulse may be lost disappear.
Page 304 14.2 Error Messages while Running Number Message Explanation 6500 Can't access USB storage. Unable to access USB memory. 6501 There is already a file of the The file cannot be renamed because it has the same name. same name. 6502 USB storage overflow.
Page 305: Conflict Messages For Modulation
14.3 Conflict Messages for Modulation 14.3 Conflict Messages for Modulation These messages are displayed when the [?] soft key is pressed when the specified modulation cannot be executed due to an inappropriate setting (conflict state). If you press this soft key [?], inappropriate setting items will be displayed, so set the setting items to the correct values.
Page 306: Sequence Compiler Message
14.4 Sequence Compiler Message 14.4 Sequence Compiler Message These messages are displayed when a setting with which execution is not possible was found as a result of sequence compilation. Number Message Explanation 4500 Amptd-Offset conflict In step M of channel N, amplitude and offset CH:<N>...
Page 307: When Suspect A Failure
14.5 When Suspect a Failure 14.5 When Suspect a Failure When an abnormality is suspected, perform the corresponding action below. If this fails to resolve the problem, please contact NF Corporation or one of its representatives. Problem Possible cause Action...
Page 308 14.5 When Suspect a Failure MEMO WF1981/WF1982 14-10...
Page 309: Maintenance
15. Maintenance 15.1 Introduction ........................15-2 15.2 Routine Maintenance ......................15-2 15.3 Storage When Not Used for a Long Period of Time ............15-3 15.4 Repacking and transportation................... 15-3 15.5 Operation Inspections ....................... 15-4 15.6 Performance Tests ......................15-5 WF1981/WF1982 15-1...
Page 310: Introduction
This instruction manual describes the operation inspection and the performance testing methods that can be easily performed. For more accurate inspections, adjustments, calibrations, or repairs, contact NF Corporation or one of our representatives. WARNING This product contains high-voltage components.
Page 311: Storage When Not Used For A Long Period Of Time
15.3 Storage When Not Used for a Long Period of Time 15.3 Storage When Not Used for a Long Period of Time ・ Disconnect the power cord from the outlet and the unit. ・ Store the unit in a location free from falling objects and dust, such as a shelf or rack. If dust may be present, cover the unit with a cloth or polyethylene cover.
Page 312: Operation Inspections
15.5 Operation Inspections 15.5 Operation Inspections ◼ Equipment To check the output waveform, an oscilloscope (e.g. Tektronix MDO3032) with an analog bandwidth of 300 MHz or higher, 2 GS/s, and an input impedance of 50 Ω is required. ◼ Checks before operation inspections Check the following before the operation inspections.
Page 313: Performance Tests
If the results of the performance tests indicate that the product does not meet the specifications, repair is required. Contact NF Corporation or one of our representatives. ◼ Checks before performance tests Check the following before the performance tests.
Page 314: Frequency Accuracy Test
15.6 Performance Tests • The ambient temperature is within the range of +20 to +30 °C. • The ambient relative humidity is within the range of 20 to 70%RH. • Non-condensing. • The product was allowed to warm up for at least 30 minutes. ◼...
Page 315: Sine Wave Amplitude Accuracy Test
15.6 Performance Tests 15.6.2 Sine Wave Amplitude Accuracy Test Connection: FCTN OUT → Digital multi-meter (AC voltage TrueRMS measurement) Use a coaxial cable. Setting: The following table shows the amplitude after setting initialization. (Frequency is set to 1 kHz). Measurement: Measure the output voltage for each waveform as the effective value. Judgment: Normal if the values fall within the ranges in the following table.
Page 316: Sine Wave Amplitude/Frequency Characteristics Test
15.6 Performance Tests Amplitude setting Rating range (load open value) 6.4 Vp-p -37.00 mV ～ +37.00 mV 3.5 Vp-p -22.50 mV ～ +22.50 mV 0.7 Vp-p -8.50 mV ～ +8.50 mV 15.6.4 Sine Wave Amplitude/Frequency Characteristics Test ◼ 100 kHz or lower Connection: FCTN OUT →...
Page 317: Sine Wave Total Harmonic Distortion Test
15.6 Performance Tests 0.05 Vp-p Reference value -X6±0.15 dB -X6±0.2 dB -X6±0.5 dB 15.6.5 Sine Wave Total Harmonic Distortion Test Connection: FCTN OUT → Audio analyzer (50 Ω termination) Use a coaxial cable. If the audio analyzer does not have a 50 Ω terminator, install a 50 Ω...
Page 318: Sine Wave Harmonic Spurious Test
15.6 Performance Tests 15.6.6 Sine Wave Harmonic Spurious Test Connection: FCTN OUT → Spectrum analyzer Use a coaxial cable. Measure a signal up to approx. 24 dBm. Use a coaxial attenuator separately so as not to exceed the allowable input of the spectrum analyzer.
Page 319: Square Wave Duty Accuracy Test
15.6 Performance Tests 15.6.8 Square Wave Duty Accuracy Test Connection: FCTN OUT → Universal counter (50 Ω termination) Use a coaxial cable. Setting: Set the waveform to square wave and the amplitude to 20 Vp-p/open after setting initialization. The following table shows the duty variable range setting, frequency setting, and duty setting.
Page 320: Time Difference Between Channels For 2-Phase (Wf1982)
15.6 Performance Tests 15.6.10 Time Difference Between Channels for 2-Phase (WF1982) Connection: CH1 FCTN OUT → Universal counter input 1 (50 Ω termination) CH2 FCTN OUT → Universal counter input 2 (50 Ω termination) Use coaxial cables of the same length and type. Setting: Set the channel mode to 2PHASE, amplitude to 20 Vp-p/open, phase of CH2 to 180 deg, and frequency to 10 MHz after setting initialization.
Page 321: List Of Initial Settings
16. List of Initial Settings 16.1 Settings Related to Oscillator ................... 16-2 Settings Related to Sequence Oscillation ................ 16-4 16.2 Other Factory Default Settings ..................16-4 16.3 WF1981/WF1982 16-1...
Page 322: Settings Related To Oscillator
16 List of Initial Settings The settings can be initialized in the Utility screen. The settings of "16.1 Settings Related to Oscillator" are initialized with [Osc Rset], and the settings of "16.2 Settings Related to Sequence Oscillation" are initialized with [Seq Rset]. These items are also stored in the setting memory (except for the output on/off setting).
Page 323 16 List of Initial Settings Phase sweep range −90° to +90° Amplitude sweep range 0.1 Vp-p to 0.2 Vp-p DC offset sweep range −0.1 V to +0.1 V Duty sweep range 40% to 60% Sweep time 100 ms Sweep mode Continuous Trigger source Internal, 1sec...
Page 324: Settings Related To Sequence Oscillation
16 List of Initial Settings Settings Related to Sequence Oscillation 16.2 ◼ Step control parameters Start step Trigger polarity Noise bandwidth 30 MHz External control input Disabled External control start/state branch Start Synchronization/sub-output Step synchronization Step time Auto hold Jump destination Jump count Infinite Stop phase...
Page 325: Specifications
17. Specifications 17.1 Oscillation Mode ....................... 17-2 17.2 Waveform ......................... 17-2 17.3 Frequency and Phase ...................... 17-3 17.4 Output Characteristics ...................... 17-3 17.5 Main Signal Characteristics ....................17-5 17.6 Modulation Function ....................... 17-10 17.7 Sweep oscillation mode ....................17-11 17.8 Burst oscillation mode ....................
Page 326: Oscillation Mode
17.1 Oscillation Mode Unless otherwise specified, the conditions are as follows: waveform output (FCTN OUT) is the target, oscillation is continuous, load is 50 Ω, amplitude setting is 10 Vp-p/50 Ω, DC offset setting is 0 V, auto range for output voltage, amplitude range of waveform is ±FS, external addition is off, and AC voltage is effective value measurement.
Page 327: Frequency And Phase
17.3 Frequency and Phase Frequency and Phase 17.3 Frequency setting range Limited to the smaller of the ranges determined by the waveforms that are output. When the synclator function is enabled, the available frequency range of oscillation is limited to 30 Hz to 5 MHz.
Page 328: Dc Offset
17.4 Output Characteristics 17.4.2 DC Offset Setting range ±10.5 V/open, ±5.25 V/50 Ω A peak value combining waveform amplitude and DC offset is limited to ±10.5 V/open or less. Setting resolution 0.1 mV (−2.999 9 V to +2.999 9 V)/open 1 mV (−3.000 V or less and +3.000 V or more)/open Accuracy ±(｜1% of DC offset setting [V]｜+5 mV...
Page 329: Main Signal Characteristics
17.5 Main Signal Characteristics Output connector Front panel, BNC receptacle Main Signal Characteristics 17.5 17.5.1 Sine wave Amplitude frequency characteristics 100 kHz or less ±0.1 dB 100 kHz to 5 MHz ±0.15 dB 5 MHz to 20 MHz ±0.3 dB 20 MHz to 30 MHz ±0.5 dB Conditions: Continuous oscillation, 50 Ω...
Page 330: Pulse Wave
17.5 Main Signal Characteristics Duty accuracy Up to 100 kHz ±0.1% of period (duty setting is 1% to 99%) 100 kHz to 1 MHz ±1% of period (duty setting is 5% to 95%) 1 MHz to 3 MHz ±3% of period (duty setting is 40% to 60%) Leading/trailing edge time 8.0 ns or less typ, but when continuous oscillation mode Overshoot...
Page 331: Parameter-Variable Waveform
17.5 Main Signal Characteristics 17.5.5 Parameter-variable Waveform Steady sine group Waveform name Waveform example Overview and variable parameters Unbalance sine Waveform for which the amplitudes of the first half cycle and second half cycle of a sine wave can be changed independently First half amplitude (−100.00% to +100.00%) -0.5 Second half amplitude (−100.00% to +100.00%)
Page 332 17.5 Main Signal Characteristics Pulse group Waveform name Waveform example Overview and variable parameters Gaussian pulse Waveform with a Gaussian distribution Standard deviation (0.01% to 100.00% of basic period) -0.5 -1.5 Lorentz pulse Lorentz waveform Half value width (0.01% to 100.00% of basic period) -0.5 -1.5 Haversine...
Page 333 17.5 Main Signal Characteristics Surge group Waveform name Waveform example Overview and variable parameters Oscillation surge Surge waveform with damped oscillation Oscillation frequency (0.01 to 50.00 times fundamental frequency) -0.5 Damped oscillation time constant (0.01% to 100.00% of basic -1.5 period) Trailing edge time constant (0.01% to 100.00% of basic period)
Page 334: Modulation Function
17.6 Modulation Function Modulation Function 17.6 17.6.1 General Modulation type FM, FSK, PM, PSK, AM, DC offset modulation and PWM PM and PSK are not possible for parameter-variable waveform and arbitrary waveform Modulation operation Start and stop Modulation source Internal, external (switchable) External modulation of FSK and PSK uses an external trigger input terminal.
Page 335: Sweep Oscillation Mode
17.7 Sweep oscillation mode ◼ PM Carrier waveform Arbitrary waveforms and standard waveforms except for parameter-variable waveforms, noise, and DC Peak deviation setting range 0.000° to 180.000° (resolution 0.001°) ◼ PSK Carrier waveform Arbitrary waveforms and standard waveforms except for parameter-variable waveforms, noise, and DC Setting range of deviation −1 800.000°...
Page 336: Sweep Conditions
17.7 Sweep oscillation mode Limitations of modulation function Modulation except sweep type is available Sweep mode Continuous, single, gated single (switchable) Common regardless of sweep type. For gated single, it oscillates only while sweep is running. However, when the waveform is DC, gated single is not available. Operation Start, stop, hold, resume, start value output and stop value output.
Page 337: Burst Oscillation Mode
17.8 Burst oscillation mode Setting resolution of start and stop amplitude less than 3 mVp-p 5 digits or 0.1 mVp-p 3 Vp-p or more 4 digits or 1 mVp-p ◼ DC Offset Sweep Waveform Arbitrary waveforms and standard waveforms Setting range of start and stop DC offset −10.5 V to +10.5 V/open Limited within the allowable setting range of DC offset for each waveform.
Page 338: Synclator Function
17.9 Synclator Function Internal trigger oscillator for burst (used except for auto burst) Period setting range 0.1 µs to 10 000 s (resolution 7 digits or 2.5 ns) Burst external trigger input (used except for auto burst) Polarity Positive, negative, disable (switchable) Input connector Use external trigger input terminal.
Page 339: Sequences
17.11 Sequences Input connector Front panel (WF1981) / rear panel (WF1982), BNC receptacle. WF1982 has 2 inputs and can be shared. Manual trigger Panel key operation Usage For single sweep, gated single sweep, trigger burst, gate, and trigger gate Internal trigger oscillator Common for sweep and burst See the internal trigger oscillation in each section.
Page 340: Bnc Connector Placement
17.12 Other I/Os Frequency reference selection External reference enable, disable (switchable) Input voltage 0.5 Vp-p to 5 Vp-p Maximum allowable input 10 Vp-p Input impedance 300 Ω, unbalanced, AC coupled Input frequency 10 MHz (±0.5% (±50 kHz)) Input waveform Sine or square wave (50±5% duty) Input connector Rear panel, BNC receptacle Frequency reference output...
Page 341: Channel Coordination Operation (Wf1982)
17.13 2 Channel Coordination Operation (WF1982) 17.13 2 Channel Coordination Operation (WF1982) Channel mode Channel mode Operation: Independent Independent setting 2 phases Oscillation in the same frequency. Limited to be the same for the oscillation mode, modulation type, and sweep type.
Page 342: Synchronization Of Multiple Units
17.14 Synchronization of Multiple Units 17.14 Synchronization of Multiple Units Connection Connect the frequency reference output of the primary unit to the frequency reference input of the secondary unit Connect the frequency reference output of the secondary unit to the frequency reference input of the next secondary unit Connection method 1 secondary unit primary unit...
Page 343: Other Functions
17.17 Other Functions duty Setting range and resolution In accordance with the setting range of each target 17.17 Other Functions Setting saving memory 10 sets (saved to non-volatile memory) Saving to USB Flash Drive is possible. 17.18 External Storage Media USB Flash Drive Connector Front panel, USB-A connector, USB 2.0 Hi-speed...
Page 344 17.21 General Characteristics Power consumption WF1981: 50 VA or less WF1982: 75 VA or less Overvoltage category Ambient temperature/humidity range conditions Guaranteed operation range 0℃ to +40℃, 5%RH to 85%RH (Where absolute humidity is 1 g/m to 25 g/m , non- condensing) The temperature range is limited for some specifications Altitude: 2 000 m or lower...
Page 345 17.21 General Characteristics ◼ Outline dimensional drawing (WF1981) 17-21...
Page 346 17.21 General Characteristics ◼ Outline dimensional drawing (WF1982) 17-22...
Page 347 17.21 General Characteristics ◼ Rack mount dimensional drawing (EIA, for 1 unit) 17-23...
Page 348 17.21 General Characteristics ◼ Rack mount dimensional drawing (EIA, for 2 units) 17-24...
Page 349 17.21 General Characteristics ◼ Rack mount dimensional drawing (JIS, for 1 unit) 17-25...
Page 350 17.21 General Characteristics ◼ Rack mount dimensional drawing (JIS, for 2 unit) 17-26...
Page 351 For repair service under warranty, the product must be returned to either NF or an agent designated by NF. Purchaser shall prepay all shipping cost, duties, and taxes for the product to NF from another country, and NF shall pay shipping charge to return the product to purchaser.
Page 352 However, we assume no responsibility for any damage regarding the contents of this manual. • We assume no responsibility for influences resulting from the operations in this manual. WF1981/WF1982 Instruction Manual (Operation) NF Corporation 6-3-20 Tsunashima Higashi, Kohoku-ku, Yokohama 223-8508, JAPAN Phone: +81-45-545-8128 Fax: +81-45-545-8187 https://www.nfcorp.co.jp/english/ ◯ C Copyright 2024 NF Corporation...
Page 353 NF Corporation...

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