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NF WF1943B Instruction Manual

Multifunctions synthesizer
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MULTIFUNCTION SYNTHESIZER
WF1943B
INSTRUCTION MANUAL
NF Corporation

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  • Page 1 MULTIFUNCTION SYNTHESIZER WF1943B INSTRUCTION MANUAL NF Corporation...
  • Page 3 DA00012503-002 WF1943B MULTIFUNCTION SYNTHESIZER Instruction Manual...

  • Page 5: Foreword

    Foreword Thank you very much for procuring the WF1943B MULTIFUNCTION SYNTHESIZER. At the outset, please take a few minutes to read the Safety Precautions indicated in this manual in order to use this equipment safely and correctly. ● Warning and Caution notices The following Warning and Caution notices appear in this manual.

  • Page 6: Safety Precautions

    Do not use this equipment in the presence of flammable gas. There is danger of fire and explosion. ● Do not remove covers This equipment contains dangerously high voltages. Do not remove external covers. Refer all internal inspection and service to a qualified service technician who fully understands the hazards. WF1943B...
  • Page 7 Appears in the text and on the product to advise risk of damage to the product. Ground indication: Indicates connector housing and signal ground is connected to a chassis ground. Indicates power switch on state. Indicates power switch off state. WF1943B...

  • Page 9: Table Of Contents

    Section 3 Basic Operation ··················································································································· 3-1 3.1 Panel description············································································································· 3-2 Front panel·············································································································· 3-3 Rear panel ··············································································································· 3-4 3.2 Input and output connectors···························································································· 3-5 Waveform output (FUNCTION OUT) ···································································· 3-5 Sync signal output (SYNC OUT)············································································ 3-6 Trigger/sweep input (TRIG/SWEEP IN)································································· 3-9 Contents 1 WF1943B...
  • Page 10 When the oscillation mode is BURST····································································· 4-48 When the oscillation mode is SWEEP····································································· 4-49 When the oscillation mode is MODU ····································································· 4-49 Additional information:··························································································· 4-50 4.6 Output waveforms for sweeping and modulation ···························································· 4-51 4.7 Equivalent noise bandwidth ···························································································· 4-53 Contents 2 WF1943B...
  • Page 11 6.2 Suspected failure············································································································· 6-6 In case of abnormality····························································································· 6-6 Section 7 Maintenance························································································································· 7-1 7.1 Outline ···························································································································· 7-2 Work contents········································································································· 7-2 Required test instruments ························································································ 7-2 7.2 Operation checks ············································································································ 7-3 Preparatory checks ·································································································· 7-3 Function checks ······································································································ 7-3 Contents 3 WF1943B...
  • Page 12 8.1 Waveform and output characteristics ·············································································· 8-2 8.2 Output voltage ················································································································ 8-4 8.3 Other functions ··············································································································· 8-5 8.4 Initialized settings··········································································································· 8-9 8.5 Remote control ··············································································································· 8-10 8.6 General items ·················································································································· 8-11 External drawing····································································································· 8-12 Index ······················································································································································ Index Contents 4 WF1943B...

  • Page 13: Section 1 Overview

    Section 1 Overview 1.1 Features ·····················································································································1-2 1.2 Operating principles···································································································1-3 Block diagram····································································································1-3 1.3 Function outline·········································································································1-4 Function tree ······································································································1-4 WF1943B...

  • Page 14: Features

    1.1 Features The WF1943B Wave Factory is a multifunctional synthesizer based on the direct digital synthesizer (DDS) system. Although the WF1943B is 1-channel, the series also includes the 2-channel WF1944B, the single-channel WF1945B with multiple functions, and the 2-channel WF1946B with additional multiple functions.

  • Page 15: Operating Principles

    The lowpass filter (LPF) smoothes the stepped D/A output signal. Amplitude control is set by the gain control. DC offset is produced by the offset D/A converter and the output amplifier adds and amplifies the output signal. The attenuator (ATT) selects the output range by 1/10 attenuation on/off. WF1943B...

  • Page 16: Function Outline

    The units can be expressed by up to 4 desired characters. • Setting store and recall The settings for frequency, amplitude, etc., can be stored and recalled. The WF1943B is capable of 10 combinations store/recall. • Computer control Remote control (GPIB or USB) enables external control from a personal computer.

  • Page 17: Section 2 Preparation

    2.1 Check before using ····································································································2-2 Safety check·······································································································2-2 Unpacking and repacking···················································································2-2 2.2 Power source and grounding······················································································2-3 Grounding··········································································································2-3 Line filter ···········································································································2-3 Power source······································································································2-3 Power supply fuse ······························································································2-5 2.3 Installation ·················································································································2-6 Cautions·············································································································2-6 Installation conditions ························································································2-6 Panel and case cleaning······················································································2-6 2.4 Conformable standards ······························································································2-7 2.5 Calibration ·················································································································2-8 WF1943B...

  • Page 18: Check Before Using

    2.1 Check before using Safety check Before using the WF1943B, refer to the Safety precautions of this manual and confirm safety. Also, before connecting the power, refer to Section 2.2 Power source and grounding and thoroughly check the safety. Unpacking and repacking First, inspect the equipment for possible damage in shipping.

  • Page 19: Power Source And Grounding

    For your safety, be sure to ground the device. Fuse To power switch Chassis Power source ! CAUTION Be sure to observe the following in order to prevent damage to the equipment. Confirm the power source voltage is within the range specified for the WF1943B. WF1943B...
  • Page 20 115V 230V Before using the WF1943B with a source voltage that differs from the factory setting, be sure to contact the sales representative of NF Corporation. Make sure that the power switch is off before connecting the power cable. Also, after switching power off, wait at least five seconds before switching the power on again.

  • Page 21: Power Supply Fuse

    There is risk of fire from an improperly rated fuse. Be sure to disconnect the power cable before replacing the fuse. Fuse: Time lag 1 A (100/115 V) or time lag 0.5 A (230 V) 250 V, φ5.2 × 20 mm The specified rating of a fuse changes depending on the power source voltage. WF1943B...

  • Page 22: Installation

    Near pulse type noise sources Also, when using, provide separation between the power cords and signal cables of the WF1943B and those of other equipment. Operating error can occur if the power cords and signal cables are too close. Cable routing requires particular attention when installing in a rack or other facility.

  • Page 23: Conformable Standards

    2.4 Conformable standards The WF1943B conforms to the following standards. Safety: EN 61010-1: 2001 EMC: EN 61326: 1997/A1: 1998/A2: 2001 However, the performance criteria for the following standards are as follows: EN61000-4-2(1995), EN61000-4-4(1995), EN61000-4-5(1995), and EN61000-4-11(1994):B The following cables are used for the test of EN 61326: 1997/A1: 1998/A2: 2001 •...

  • Page 24: Calibration

    2.5 Calibration Section 7.3 the Performance tests are recommended at least once a year. These should also be conducted before important tests and measurements. WF1943B...

  • Page 25: Section 3 Basic Operation

    Amplitude setting·······························································································3-18 DC offset setting ································································································3-19 Phase setting ······································································································3-20 Output on/off ·····································································································3-21 Operation tree ····································································································3-22 ・Following is an example of the display when using this section. Fully lighted (bold) Flashing ＰＲＥＳＥＴ ＳＹＳＴＥＭ：ＲＡＮＧＥ ＰＲＥＳＥＴ ＵＳＥＲ-ＵＮＩＴ Fully lighted (bold) Dimly lighted WF1943B...

  • Page 26: Panel Description

    3.1 Panel description This section describes the indications and functions of the front and rear panels of the WF1943B. WF1943B...

  • Page 27: Front Panel

    3.1 Panel description Front panel WF1943B...

  • Page 28: Rear Panel

    3.1 Panel description Rear panel WF1943B...

  • Page 29: Input And Output Connectors

    50 Ω input impedance or terminating the input at 50 Ω. ・Setting and output voltages The setting voltage display and actual output voltage (load terminal voltage) differ according to the load resistance. “5.4 Other settings (■LOAD function (equalize setting and output values))”, cf. WF1943B...

  • Page 30: Sync Signal Output (Sync Out)

    Although 50 Ω termination is possible, the high level voltage is reduced by about half. ・ Waveform and sync signal output relationship (Waveform phase definition) (1) Continuous oscillation mode (NORMAL) ① Sinewave WF1943B...
  • Page 31 FUNCTION OUT waveform when stop level is On or 100 kHz and below. ④ Squarewave (variable duty) (Phase definition) FUNCTION OUT Appendix. 14ns Jitter = 25ns p-p SYNC OUT Approximately 25 ns p-p jitter is also produced in the FUNCTION OUT waveform. WF1943B...
  • Page 32 (4) Modulation mode (MODU) High level when modulation waveform phase is above 0 and less than 180 degrees. Low level above 180 and below 360 degrees. (5) Noise mode (NOISE) Digital (binary) noise source output. (6) DC mode (DC) Always high level. WF1943B...

  • Page 33: Trigger/Sweep Input (Trig/Sweep In)

    However, contact chatter from a mechanical switch or relay can prevent normal operation. Also, chattering will prevent normal operation when the oscillation mode is triggered gate. Avoid using a logic IC circuit having a power supply voltage higher than +5 V such as example (c) for the WF1943B input WF1943B...

  • Page 34: Basic Operation

    (lower PRESET flashes). ＰＲＥＳＥＴ ＳＹＳＴＥＭ：ＲＡＮＧＥ ＰＲＥＳＥＴ ＵＳＥＲ－ＵＮＩＴ 4 ENTER ② Press the key (upper PRESET flashes). ENTER ENTER ③ Again press the key to initialize. To return without initializing, before pressing EXIT press the key twice. 3-10 WF1943B...
  • Page 35 0 deg SPAN 180 deg MODE→MODU TYPE FREQUENCY 100 Hz FUNCTION MODE → MODU, DEVIATION 1000 Hz TYPE=FM MODE → MODU, DEVIATION 90 deg TYPE=PM ENTRY→FREQ 1000 Hz ENTRY→AMPTD 0.1 Vp-p ENTRY→OFFSET ENTRY→PHASE 0 deg Continued next page 3-11 WF1943B...
  • Page 36 ENTRY→WIDTH 0.0005 s In case of FUNCTION= ENTRY→DUTY 50 % In case of FUNCTION= ENTRY→PERIOD 0.001 s ENTRY→HIGH 0.05 V −0.05 V ENTRY→LOW FUNCTION SYSTEM RANGE AUTO LOAD OPEN (50 ohms at SET) DUTY-VALID IMMED SYNC OUT STATE 3-12 WF1943B...

  • Page 37: Oscillation Mode Selection

    In this example, first set to DC, then to continuous (NORMAL). MODE ① Press the key, then the key to set the DC mode. The DC STATUS lamp lights. MODE NORMAL ② Press the key, then the key to set the NORMAL mode. The NORMAL STATUS lamp lights. 3-13 WF1943B...

  • Page 38: Waveform Selection

    When the pulse width is 100 ns or less, jitter becomes relatively larger compared with the pulse width, and a warning message is displayed. If the pulse width falls below 25 ns, pulses may disappear. If the pulse width falls below 100 ns, jitter becomes relatively larger compared with the pulse width. 3-14 WF1943B...
  • Page 39 Even though DUTY-VALID is set to CYCLE, extra pulses may be output if the frequency or phase is changed. Operation when DUTY-VALID: IMMED The setting will be reflected at the same time that the duty changes Operation when DUTY-VALID: CYCLE The setting will be reflected in the subsequent cycles Duty change 3-15 WF1943B...
  • Page 40 99.9900%. When the frequency is about 4 kHz or less, pulse losses can be prevented by restricting the duty range to 0.0100% to 99.9900%. The waveform cannot be selected in the following cases. ・ Oscillation mode is NOISE or DC. 3-16 WF1943B...

  • Page 41: Frequency Setting

    (e.g., 50 Hz), press ENTER key directly after entering the frequency. “5.2 Units”, cf. ・ The frequency generating period can also be set. “5.1 Convenient Settings (■Frequency [Hz] setting by period [s])”, cf. 3-17 WF1943B...

  • Page 42: Amplitude Setting

    ・ Units other than Vp-p can also be set. “5.2 Units”, cf. ・ Can also be set by waveform high level and low level. “5.1 Convenient Settings (■Amplitude and DC offset setting by high and low level)”, cf. 3-18 WF1943B...

  • Page 43: Dc Offset Setting

    ④ After setting, press the key to release the setting mode. Other: ・ Can also be set by waveform high level and low level. “5.1 Convenient Settings (■Amplitude and DC offset setting by high and low level)”, cf. 3-19 WF1943B...

  • Page 44: Phase Setting

    ① Press the key, then the key. ② Select the digit to be changed with the keys. MODIFY ③ Turn the dial to set the flashing digit. EXIT ④ After setting, press the key to release the setting mode. 3-20 WF1943B...

  • Page 45: Output On/Off

    3.3 Basic operation Output on/off Output on/off setting is described. Operation: OUTPUT ① Press the key. The setting alternates between on and off each time the key is pressed. ON/OFF The lamp lights when on, extinguishes when off. 3-21 WF1943B...

  • Page 46: Operation Tree

    FUNCTION (Sweep waveform) [LIN/LOG, /SIN] START (Sweep start value) STOP (Sweep end value) TIME (Sweep time) STOP-LEVEL (Stop level) * For MODE: GATED CENTER (Sweep center value) SPAN (Sweep width) START-STATE (Start state) STOP-STATE (Stop state) SWEEP Operation START STOP PAUSE 3-22 WF1943B...
  • Page 47 Arbitrary waveform menu * For FUNCTION: ARB SELECT (Select arbitrary waveform) NAME (Arbitrary waveform name) EDIT (Edit arbitrary waveform) COPY (Copy arbitrary waveform) MARK-CLEAR (Clear mark) CLEAR (Clear arbitrary waveform) SIZE (Selection of data size of arbitrary waveform) 3-23 WF1943B...
  • Page 48 STORE (Save setup memory) RECALL (Call setup memory) CLEAR (Clear setup memory) (Release remote state) LOCAL UNDO (Cancel setting) EXIT (Move to menu immediately above) ENTER (Accept input value) Numeric input (keypad) ・ µ Numeric modification (Modify) MODIFY 3-24 WF1943B...

  • Page 49: Section 4 Applications

    4.6 Output waveforms for sweeping and modulation ·······················································4-50 4.7 Equivalent noise bandwidth ·······················································································4-52 ・Following is an example of the display when using this section. Fully lighted (bold) Dimly lighted ＢＵＲＳＴ ＴＲＩＧ ＧＡＴＥ 4 ＢＵＲＳＴ：ＴＹＰＥ ＭＡＲＫ ＳＰＡＣＥ ＳＴＯＰ―ＬＥＶＥＬ Fully lighted Flashing Dimly lighted (bold) WF1943B...

  • Page 50: Burst Oscillation

    ③ Press the key, then produce the following display with the keys (BURST flashes). ＢＵＲＳＴ ＴＲＩＧ ＧＡＴＥ 4 ＢＵＲＳＴ：ＴＹＰＥ ＭＡＲＫ ＳＰＡＣＥ ＳＴＯＰ―ＬＥＶＥＬ EXIT ④ This sets the burst oscillation type to burst. Press the key once to exit type setting. WF1943B...
  • Page 51 (0.5 cycles). In this example, the setting is 1.5 cycles. EXIT ④ After setting, press once to exit space cycle setting. (4) Set STOP-LEVEL ① Use the keys to produce the following display (STOP-LEVEL flashes). ＯＦＦ ＢＵＲＳＴ：ＴＹＰＥ ＭＡＲＫ ＳＰＡＣＥ ＳＴＯＰ―ＬＥＶＥＬ WF1943B...
  • Page 52 Stop 1 wave Oscillation start Start phase: -90° • Burst oscillation setting items (BURST menu) TYPE: BURST MARK (oscillation cycle) [cycle] SPACE (cycle when oscillation stops) [cycle] STOP-LEVEL [OFF, ON[%]] PHASE (phase when oscillation starts) [deg] * ENTRY menu WF1943B...

  • Page 53: Burst Oscillation (Type: Trigger)

    ③ Press the key, then produce the following display with the keys (TRIG flashes). ＢＵＲＳＴ ＴＲＩＧ ＧＡＴＥ 4 ＴＲＩＧ：ＴＹＰＥ ＳＯＵＲＣＥ ＤＥＬＡＹ ＭＡＲＫ 4 EXIT ④ This sets the burst oscillation type to trigger. Press the key to exit type setting. WF1943B...
  • Page 54 ０．３μｓ ＴＲＩＧ：ＴＹＰＥ ＳＯＵＲＣＥ ＤＥＬＡＹ ＭＡＲＫ 4 ENTER ② Press the key. MODIFY ③ Set the delay time with the keypad or dial. For example, set to 1 ms. EXIT ④ After setting, press once to release delay time setting. WF1943B...
  • Page 55 In this example, the setting is -50 %. The stop level is the percentage with respect to the maximum positive (+100 %) and negative (-100 %) amplitude. EXIT ④ After setting, press the key to release the setting mode. WF1943B...
  • Page 56 • Burst oscillation (type: trigger) setting items (BURST menu) TYPE: TRIG SOURCE (trigger source) [EXT , EXT , INT [s] DELAY (trigger delay) [s] MARK (oscillation cycle) [cycle] STOP-LEVEL [OFF, ON[%]] PHASE (phase when oscillation starts) [deg] * ENTRY menu WF1943B...

  • Page 57: Burst Oscillation (Type: Gate)

    ③ Press the key, then produce the following display with the keys (GATE flashes). ＢＵＲＳＴ ＴＲＩＧ ＧＡＴＥ ＧＡＴＥ：ＴＹＰＥ ＳＯＵＲＣＥ ＳＴＯＰ－ＬＥＶＥＬ ④ This sets the burst oscillation type for gate. EXIT Press the key once to release the type setting mode. WF1943B...
  • Page 58 The above selects sets burst oscillation (type: gate). Oscillation occurs when a high level signal is applied to the TRIG/SWEEP IN connector. If the connection is open, oscillation continues due to internal pullup. 4-10 WF1943B...
  • Page 59 “Remote Control Instruction Manual”, cf. • Burst oscillation (type: gate) setting items (BURST menu) TYPE: GATE SOURCE (trigger source) [EXT L-ON, EXT H-ON, INT [s] STOP-LEVEL [OFF, ON [%]] PHASE (phase when oscillation starts) [deg] * ENTRY menu 4-11 WF1943B...

  • Page 60: Burst Oscillation (Type: Triggered Gate)

    ③ Press key, then use the keys to produce the following display (T-GATE flashes). Ｔ－ＧＡＴＥ Ｔ－ＧＡＴＥ：ＴＹＰＥ ＳＯＵＲＣＥ ＳＴＯＰ―ＬＥＶＥＬ EXIT ④ This sets the burst oscillation type for triggered gate. Press the key once to release the type setting mode. 4-12 WF1943B...
  • Page 61 ⑤ After setting, press the key to release the setting mode. The above sets the burst oscillation (type: triggered gate). Oscillation alternates between start and stop each time a signal ( ) is applied to the TRIG/SWEEP IN connector. 4-13 WF1943B...
  • Page 62 “Remote Control Instruction Manual”, cf. For details of the remote control command, • Burst oscillation (type: triggered gate) setting items (BURST menu) TYPE: T-GATE SOURCE (trigger source) [ EXT , EXT STOP-LEVEL [OFF, ON[%]] PHASE (phase when oscillation starts) * ENTRY menu 4-14 WF1943B...

  • Page 63: Sweep

    ENTER ③ Press , then use the keys to produce the following display (SINGLE flashes). ＳＩＮＧＬＥ ＣＯＮＴ ＧＡＴＥＤ Ｆ－ＳＷＰ：ＴＹＰＥ ＳＯＵＲＣＥ ＭＯＤＥ EXIT ④ This sets the sweep mode for single. Press the key once to release mode select. 4-15 WF1943B...
  • Page 64 (FUNCTION flashes). ＬＩＮ Ｆ－ＳＷＰ： ＦＵＮＣＴＩＯＮ ＳＴＡＲＴ ＳＴＯＰ 4 ENTER ② Press the key. MODIFY ③ Press the key, then select with the dial. EXIT ④ After selecting, press the key once to release the function select mode. 4-16 WF1943B...
  • Page 65 ＦＵＮＣＴＩＯＮ ＳＴＡＲＴ ＳＴＯＰ ENTER ② Press key. MODIFY ③ Set the stop frequency with the keypad or dial. For example, set to 1000 Hz. EXIT ④ After setting, press the key once to release the stop frequency setting mode. 4-17 WF1943B...
  • Page 66 The output quickly changes to the start frequency, then sweeps to the stop frequency in 3 seconds (in this example). Oscillation then continues at the stop frequency. When the key is again pressed, sweep begins at the stop frequency and ends at the start START frequency. 4-18 WF1943B...
  • Page 67 TRIG/SWEEP IN connector. However, note that retrigger cannot be applied for 100 ms after sweep start. During a sweep, the sweep restarts if a trigger is input. ＥＸＴ Ｆ－ＳＷＰ：ＴＹＰＥ ＳＯＵＲＣＥ ＭＯＤＥ 4 4-19 WF1943B...
  • Page 68 “4.2 Sweep (■Sweep value and SYNC OUT)”, cf. • To generate the trigger signal via remote control (GPIB or USB), set the GET command or TRG command from the remote control interface. For details of the remote control command, “Remote Control Instruction Manual”, cf. 4-20 WF1943B...

  • Page 69: Sweep (Mode: Continuous)

    (CONT flashes). ＳＩＮＧＬＥ ＣＯＮＴ ＧＡＴＥＤ Ｆ－ＳＷＰ：ＴＹＰＥ ＭＯＤＥ ＦＵＮＣＴＩＯＮ ＳＴＡＲＴ 4 EXIT ④ This completes setting the sweep mode to continuous. Press the key once to release the setting mode. 4-21 WF1943B...
  • Page 70 (FUNCTION flashes). ＬＩＮ Ｆ－ＳＷＰ：ＴＹＰＥ ＭＯＤＥ ＦＵＮＣＴＩＯＮ ＳＴＡＲＴ 4 ENTER ② Press the key. MODIFY ③ Press the key, then turn the dial to select EXIT ④ After selecting, press the key once to release the function select mode. 4-22 WF1943B...
  • Page 71 ENTER ② Press the key. MODIFY ③ Set the sweep time with the key pad or dial. For example, set to 2 seconds. EXIT ④ After setting, press the key once to release the sweep time setting mode. 4-23 WF1943B...
  • Page 72 START-STATE is the same as pressing the key (during a continuous sweep). STOP Relationship between sweep values and sweep synchronization output, “4.2 Sweep (■Sweep value and SYNC OUT)”, cf. 4-24 WF1943B...

  • Page 73: Sweep (Mode: Gated)

    ③ Press the key, then use the keys to produce the following display (GATED flashes). ＳＩＮＧＬＥ ＣＯＮＴ ＧＡＴＥＤ Ｆ－ＳＷＰ：ＴＹＰＥ ＳＯＵＲＣＥ ＭＯＤＥ EXIT ④ This completes setting the sweep mode to gated. Press the key once to release the setting mode. 4-25 WF1943B...
  • Page 74 (FUNCTION flashes). ＬＩＮ Ｆ－ＳＷＰ： ＦＵＮＣＴＩＯＮ ＳＴＡＲＴ ＳＴＯＰ 4 ENTER ② Press the key. MODIFY ③ Press the key, then select with the dial EXIT ④ After selecting, press the key once to release the function select mode. 4-26 WF1943B...
  • Page 75 3 ＦＵＮＣＴＩＯＮ ＳＴＡＲＴ ＳＴＯＰ ENTER ② Press the key. MODIFY ③ Set the frequency with the keypad or dial. For example, set to 200 Hz. EXIT ④ After setting, press the key once to release the stop frequency setting mode. 4-27 WF1943B...
  • Page 76 For example, set to 50 %. The stop level is a percentage with respect to the maximum positive and negative amplitudes taken respectively as +100 % and -100 %. EXIT ⑤ After setting, press the key to exit stop level setting. 4-28 WF1943B...
  • Page 77 4.2 Sweep (8) Start sweep ① Press the key. START In this example, sweep ends after 3 seconds and oscillation stops. Again press the key to START sweep from the stop to the start frequency. 4-29 WF1943B...
  • Page 78 : The function determines the sweep type. For example, provides step-type change of output (e.g., frequency) at the sweep time halfway point. LIN/LOG provides linear or logarithmic variation of the output with respect to the time axis. iSIN ( 4-30 WF1943B...
  • Page 79 Relationship between sweep values and sweep synchronization output, “4.2 Sweep (■Sweep value and SYNC OUT)”, cf. • If the frequency is low and the sweep rest period short, in some cases, oscillation may not stop immediately at the end of sweep. 4-31 WF1943B...

  • Page 80: Center, Span

    START = CENTER −/+ (SPAN ÷ 2) STOP = CENTER +/− (SPAN ÷ 2) • When span is changed: Center does not change. START = CENTER − /+ (SPAN ÷ 2) STOP = CENTER +/− (SPAN ÷ 2) 4-32 WF1943B...

  • Page 81: Summary Of The Sweep Setting Items

    STOP (sweep end/sweep start state) *For subsequent operation when the sweep has been completed, the state is reset to the sweep start state. PAUSE (sweep pause/restart) In the SWEEP menu • START-STATE (sweep start state) STOP-STATE (sweep stop state) 4-33 WF1943B...

  • Page 82: Sweep (Modulation) Steps And Step Width

    • Deriving step width Span During linear sweep, step width = ――――――― Step number -1 stop ――― ÷ (step no. -1)] During logarithmic sweep, step width = log [log start Step width during log sweep changes with step progression. 4-34 WF1943B...

  • Page 83: Sweep Value And Sync Out

    4.2 Sweep Sweep value and SYNC OUT ◆ Approximately 100 to 125 µs 4-35 WF1943B...

  • Page 84: Modulation

    ③ Press the key, then use the keys to produce the following display (FM flashes). ＦＭ ＰＭ ＦＭ：ＴＹＰＥ ＤＥＶＩＡＴＩＯＮ ＦＲＥＱ ＦＵＮＣＴＩＯＮ EXIT ④ This sets the modulation type for frequency. Press the key once to release the type setting mode. 4-36 WF1943B...
  • Page 85 For example, set to 50 Hz (20 ms). EXIT ④ After setting, press the key once to release the modulation setting mode. (4) Select the modulation waveform (FUNCTION) ① Use the keys to produce the following display (FUNCTION flashes). ＳＩＮ ＦＭ：ＴＹＰＥ ＤＥＶＩＡＴＩＯＮ ＦＲＥＱ ＦＵＮＣＴＩＯＮ 4-37 WF1943B...
  • Page 86 To stop modulation: Press the key. Resume modulation by pressing the key. STOP START • Setting items at frequency modulation (MODU menu) TYPE: FM DEVIATION (frequency deviation) [Hz] FREQ (modulation frequency) [Hz] FUNCTION (modulation waveform) [SIN, 4-38 WF1943B...

  • Page 87: Phase Modulation (Pm)

    ③ Press the key, then use the keys to produce the following display (PM flashes). ＦＭ ＰＭ ＰＭ：ＴＹＰＥ ＤＥＶＩＡＴＩＯＮ ＦＲＥＱ ＦＵＮＣＴＩＯＮ EXIT ④ This sets the modulation type for phase. Press the key once to release the type setting mode. 4-39 WF1943B...
  • Page 88 For example, set to 200 Hz (5 ms). EXIT ④ After setting, press the key once to release the modulation frequency setting mode. (4) Select the modulation waveform (FUNCTION) ① Use the keys to produce the following display (FUNCTION flashes). ＳＩＮ ＰＭ：ＴＹＰＥ ＤＥＶＩＡＴＩＯＮ ＦＲＥＱ ＦＵＮＣＴＩＯＮ 4-40 WF1943B...
  • Page 89 To stop modulation : Press the key. Resume modulation by pressing the key. STOP START • Setting items at phase modulation (MODU menu) TYPE: PM DEVIATION (phase deviation) [deg] FREQ (modulation frequency) [Hz] FUNCTION (modulation waveform) [SIN, 4-41 WF1943B...

  • Page 90: Arbitrary Waveform

    (1:ARB_01 flashes). ０：ＡＲＢ＿００ １：ＡＲＢ＿０１ ＡＲＢ：ＳＥＬＥＣＴ ＮＡＭＥ ＥＤＩＴ ＣＯＰＹ 4 EXIT ③ This completes the selection of an arbitrary waveform (No. 1 is selected here). Press the key one time to release the arbitrary waveform selection mode. 4-42 WF1943B...
  • Page 91 (COPY flashes). ＳＩＮ ＡＲＢ：ＳＥＬＥＣＴ ＮＡＭＥ ＥＤＩＴ ＣＯＰＹ ENTER ② Press key, then use the keys to produce the following display (SIN flashes). ＳＩＮ ＡＲＢ：ＳＥＬＥＣＴ ＮＡＭＥ ＥＤＩＴ ＣＯＰＹ ENTER ③ Press key to copy the sinewave. 4-43 WF1943B...
  • Page 92 * is interpolation type mark and indicates the linear interpolation type address. The mark appears and extinguishes each time the key is pressed. ⑤ Next, use above steps ③ and ④ to set the interpolation mark (*) to waveform address 3072. 4-44 WF1943B...
  • Page 93 1024 and 3072. ⑧ In the same manner as above steps ① to ⑥, clip the first half of a sinewave (set interpolation marks at 5120 and 7168). The above completes arbitrary waveform setting. 4-45 WF1943B...
  • Page 94 The output waveform changes as described below when the waveform data size is changed. If, for example, the waveform data size is changed from 16 KB to 8 KB when there is a waveform like for waveform number 0, is assigned to waveform number 0 and to waveform number 1. 4-46 WF1943B...

  • Page 95: Selecting Waveforms Of Synchronous Signals (Sync Out)

    For other cases, high level while between 0 and 180 degrees of the waveform in the oscillation period, and low level while between 180 and 360 degrees. Oscillating Stopped FUNCTION OUT SYNC OUT SYNC OUT: STATE SYNC OUT SYNC OUT: PHASE 4-47 WF1943B...

  • Page 96: When The Oscillation Mode Is Sweep

    FUNCTION OUT. Otherwise, high level while between 0 and 180 degrees of the modulated waves, and low level while between 180 and 360 degrees. Modulation execution FUNCTION OUT SYNC OUT SYNC OUT: STATE SYNC OUT SYNC OUT: PHASE 4-48 WF1943B...

  • Page 97: Additional Information

    + 90 degrees shifts the output level to the high level while oscillation is stopped. SYNC OUT The shaded sections represent an undefined output level. Approximately ±2 degrees Phase 0° 180° 360° (=0°) (ideal value) 4-49 WF1943B...

  • Page 98: Output Waveforms For Sweeping And Modulation

    , but also by , and Since the phase changes at intervals of 100 to 252 µs, discontinuities are generated The phase is swept Waveform when swept Update interval 100 to 252 µs Waveform when not swept 4-50 WF1943B...
  • Page 99 360 × oscillation frequency [Hz] × sweep time [s] If, for example, the frequency is 1 kHz, the phase span is 90 degrees, and the sweep time is 100 ms, an extra pulse is generated every 400 cycles on average. 4-51 WF1943B...

  • Page 100: Equivalent Noise Bandwidth

    4.7 Equivalent noise bandwidth The density of noise generated by the WF1943B is as shown in the following figure (a) "Frequency characteristics of noise generated by the WF1943B." The effective values (rms) of (a) are equal to those of white noise in the figure (b) "Frequency characteristics of white noise,"...

  • Page 101: Section 5 Other Operations

    UNDO function··································································································5-19 Pulse generator function·····················································································5-20 Phase initialization ·····························································································5-22 ・Following is a typical example of the display panel indications used in this Section. Fully lighted(bold) Dimly lighted ＦＲＥＱ ＰＥＲＩＯＤ ＡＭＰＴＤ 4 ＵＳＥＲ ＵＮＩＴ：ＴＹＰＥ ＮＡＭＥ ＦＯＲＭＵＲＡ 4 Fully lighted(bold) Flashing Dimly lighted WF1943B...

  • Page 102: Convenient Settings

    Thus, the setting tolerance is large when the frequency setting digits are fewer (period longer). MODIFY In this situation, even if setting is changed by the keypad or dial, the actual oscillation period does not change in some cases. WF1943B...

  • Page 103: Squarewave Duty Setting

    • The actual waveform duty resolution is [oscillation frequency] [approx. 40 MHz] (0.00001 % at minimum). When the stop level is on, the minimum actual waveform duty resolution is approximately 0.003 %. • For other notes, see "■Waveform selection " in Section 3.3, "Basic operation." WF1943B...

  • Page 104: Squarewave Pulse Width Setting

    • Due to the oscillation period and duty relationship, the pulse can be lost when the actual pulse width is less than 25 ns. An error message is displayed at this type of setting. Also, jitter increases when the pulse width is less than 100 ns. A warning message is displayed at this type of setting. WF1943B...

  • Page 105: Amplitude And Dc Offset Setting By High And Low Level

    For example, set to +5 V. EXIT ③ Press the key, then the key to produce the following display. ＬＯＷ －０．０５００ Ｖ １０００．０００００００Ｈｚ Ｈ＋５．００００Ｖ ／ＯＰＥＮ MODIFY ④ Set the Low level with the keypad or dial. For example, set to +0 V. WF1943B...
  • Page 106 • Due to the relationships between high and low level settings, and between amplitude and DC offset settings, when the output voltage exceeds the following values, the Over lamp flashes and the output is clipped in some cases. 10 V range: Approx. 11 V peak/open time 1 V range: Approx. 1.1 V peak/open time WF1943B...

  • Page 107: Units

    ② Press the key to change the display as follows. １０００．００００００００ｋＨｚ Ａ０．１０００Ｖｐ－ｐ Ｏ＋０．００００Ｖ ／ＯＰＥＮ Other: • Unit change enable: Only when the key is lighted. µ ENTER • Initializing units (e.g., from kHz to Hz): At above step②, press the key. WF1943B...

  • Page 108: Amplitude Units Change

    Notes: Only Vp-p and USER can be selected when the oscillation mode is NOISE. Only Vp-p and USER can be selected when the selected waveform is ARB. • Even if the amplitude units are changed, the actual output voltage does not change. WF1943B...

  • Page 109: User-Unit Setting

    (FREQ flashes). ＦＲＥＱ ＰＥＲＩＯＤ ＡＭＰＴＤ 4 ＵＳＥＲ ＵＮＩＴ：ＴＹＰＥ ＮＡＭＥ ＦＯＲＭＵＬＡ 4 EXIT ④ This selects the setting type to frequency. Press the key once to release the type select mode. WF1943B...
  • Page 110 ② Press the key, then use the keys to produce the following display [(h+n)*m flash]. （ｈ＋ｎ）＊ｍ （Ｌｏｇ（ｈ）＋ｎ）＊ｍ ＵＳＥＲ ＵＮＩＴ：ＴＹＰＥ ＮＡＭＥ ＦＯＲＭＵＬＡ EXIT ③ This sets the formula to (h+n)*m. Press the key once to release the formula setting mode. 5-10 WF1943B...
  • Page 111 ① Press the key, then the key. ② Press the key to produce the following display (Hz flashes). １０００．００００００００ Ｈｚ Ａ０．１０００Ｖｐ－ｐ Ｏ＋０．００００Ｖ ／ＯＰＥＮ MODIFY ③ Turn the dial to produce the following display. ６００００．０００００００ ｒｐｍ Ａ０．１０００Ｖｐ－ｐ Ｏ＋０．００００Ｖ ／ＯＰＥＮ 5-11 WF1943B...
  • Page 112 Since the logarithm of a negative value cannot be a real number, "OVER" is displayed. Thereafter, user setup values can be arbitrarily changed. However, the DC offset and phase output to FUNCTION OUT cannot be converted to a negative value while user units are being used. 5-12 WF1943B...

  • Page 113: Setting Memory

    EXIT The above completes memory storage. Press the key to release the storage mode. Other: • By pressing the keypad at above step ②, name input is omitted and storage is at the memory of the depressed number. 5-13 WF1943B...

  • Page 114: Setting Recall

    • Items stored in the setting memory and user unit settings are noted in Section [3.3 Basic operation, Setting initialize]. The following items do not change before and after recall. • Output on/off • Output on/off state at power on • Arbitrary waveform parameter • Type of remote control • GPIB parameter • USB ID 5-14 WF1943B...

  • Page 115: Setting Memory Clear

    １ ２ ３ ４ ５ ６ ７ ８ ９ ENTER ③ Press key to clear the memory recall. Other: • At above step ②, pressing the keypad clears the corresponding memory number. Only the stored numbers of the keypad light. 5-15 WF1943B...

  • Page 116: Other Settings

    • If the output range is set as 1 V when the amplitude setting is larger than 2 Vp-p (open), the amplitude is automatically changed to 1/10 since voltage exceeding 2 Vp-p (open) cannot be output in the 1 V range. 5-16 WF1943B...

  • Page 117: Output On/Off At Power On

    (POWER-ON flashes). ＬＡＳＴ－ＳＴＡＴＥ ＯＦＦ ＯＮ ＳＹＳＴＥＭ： 3 ＳＹＮＣＯＵＴ ＰＯＷＥＲ－ＯＮ ＲＥＭＯＴＥ ENTER ② Press the key, then use the keys to produce the following display (OFF flashes). ＬＡＳＴ－ＳＴＡＴＥ ＯＦＦ ＯＮ ＳＹＳＴＥＭ： 3 ＳＹＮＣＯＵＴ ＰＯＷＥＲ－ＯＮ ＲＥＭＯＴＥ 5-17 WF1943B...

  • Page 118: Load Function (Equalize Setting And Output Values)

    100 Ω. ③ Press the key, then turn the The above setting calculates the actual voltage of FUNCTION OUT connector from the WF1943B output impedance (50 Ω) and the load impedance for automatically changing the indicated value. Other: •...

  • Page 119: Undo Function

    (ineffective when UNDO is extinguished). Other: • Undo enabled: Directly after changing frequency, amplitude, etc., with the keypad or MODIFY dial. MEMORY UNDO Directly after setting recall ( → RECALL). Press the key to return the state prior to recall. 5-19 WF1943B...

  • Page 120: Pulse Generator Function

    5.4 Other settings Pulse generator function Operation of the WF1943B as a pulse generator is described. Operation: (1) Set for continuous pulse output Period: 2 ms Pulse width: 0.2 ms FUNCTION ① Set the waveform to squarewave (variable duty), ( →...
  • Page 121 • Double pulse output: At above step ④, set MARK = 2.0 cycles. • Manual trigger: At above step ④, set SOURCE = EXT and press the key. MAN TRIG (Do not connect anything to the TRIG/SWEEP IN connector.) 5-21 WF1943B...

  • Page 122: Phase Initialization

    ② Press the key to perform phase initialization. Other: φ sync is effective in Normal oscillation mode. In other modes, the phase may shift 180 degrees and the values of the mark cycle and space cycle settings may change. 5-22 WF1943B...

  • Page 123: Section 6 Troubleshooting

    Section 6 Troubleshooting 6.1 Error message ············································································································6-2 Power on error ···································································································6-2 Operation error···································································································6-3 6.2 Suspected failure········································································································6-6 In case of abnormality························································································6-6 WF1943B...

  • Page 124: Error Message

    Calibration data Contact dealer. Although possible to start destroyed. by pressing the ENTER key, accuracy cannot be guaranteed. SYSTEM TEST FAILED 001 Internal ROM sum Contact dealer. check error. SYSTEM TEST FAILED 002 Internal RAM Contact dealer. read/write error. WF1943B...

  • Page 125: Operation Error

    SETTINGS CONFLICT 007 Combined period and pulse width exceed the permissible duty setting range. Since the mode is SWEEP or MODU for (variable duty), SETTINGS CONFLICT 010 DUTY-VALID cannot be set. continued next page WF1943B...
  • Page 126 Since combined period and pulse width exceed the permissible duty setting range, pulse width was changed in order to enter the permissible duty range. WARNING 010 The sweep function was changed from LOG to LIN. WARNING 011 The sweep mode was changed from gated to single. WF1943B...
  • Page 127 Sweep time or modulation frequency exceeded the settable range and was automatically changed to within the permissible setting range. WARNING 015 Because of DUTY-VALID change, the duty was changed to 0.01% or 99.99%. WARNING 017 Because of a mode change, DUTY-VALID was changed to IMMED. WF1943B...

  • Page 128: Suspected Failure

    Set the address and USB ID so that they do not to that of another device match those of other devices. Settings have been The instruction manual presumes the settings have Does not operate initialized (PRESET). been initialized. according to instruction manual WF1943B...

  • Page 129: Section 7 Maintenance

    Preparatory checks ·····························································································7-3 Function checks ·································································································7-3 7.3 Performance tests·······································································································7-5 Performance tests ·······························································································7-5 Preparatory checks ·····························································································7-5 Test preparation ·································································································7-5 Frequency accuracy ···························································································7-5 Amplitude accuracy ···························································································7-6 DC offset accuracy·····························································································7-6 Amplitude vs. frequency characteristics·····························································7-7 Sinewave distortion····························································································7-7 Squarewave response ·························································································7-8 Duty factor ·········································································································7-8 WF1943B...

  • Page 130: Outline

    AC voltmeter 2 True rms, accuracy better than 1 %, bandwidth at least 20MHz, recommended: Boonton Model 9200C+952016+952002 Distortion meter Full scale 0.1 %, frequency up to 100 kHz 50 Ω feed through terminator 50 Ω 20 dB attenuator WF1943B...

  • Page 131: Operation Checks

    ・Frequency ( → ENTRY AMPTD ・Amplitude ( → ENTRY OFFSET ・DC offset ( → FUNCTION ・Waveform ( Duty fixed 50 %， → ， ， ， FUNCTION ENTRY DUTY ・Duty ( Variable duty， → → OUTPUT ・Output on/off ( ON/OFF WF1943B...
  • Page 132 Conduct some of the main function checks via GPIB/USB and confirm the same output variations. Also note that the remote (REM) indicator lights. Press the key and confirm the remote indicator extinguishes and the local mode is LOCAL returned (not local lock out). WF1943B...

  • Page 133: Performance Tests

    Normal if within ±5 ppm (999.995 to 1.000005 MHz) (when shipped) Judgment: However, since aging may occur with up to ±3 ppm/year, deterioration up to ±8 ppm (999.992 to 1.000008 MHz) may have occurred if one year has passed since shipment. WF1943B...

  • Page 134: Amplitude Accuracy

    ±4.905 to ±5.095 V 10 V ±2.000 V/open ±1.920 to ±2.080 V 10 V ±1.000 V/open ±0.925 to ±1.075 V 10 V −0.070 to +0.070 V 10 V 0.000 V/open ±1.0000 V/open ±0.985 to ±1.015 V −0.010 to +0.010 V 0.0000 V/open WF1943B...

  • Page 135: Amplitude Vs. Frequency Characteristics

    Initialize, then set the amplitude to 20 Vp-p/open and the frequency as indicated in the table. Measurement: Measure the distortion Judgment: The normal range is indicated in the table. Frequency Normal range (Bandwidth 500 kHz) 10 Hz to 100 kHz 0.2 % or less WF1943B...

  • Page 136: Squarewave Response

    Rated range (duty 50 % fixed) 1 MHz 490 to 510 ns (duty 50 % fixed) 10 MHz 47.0 to 53.0 ns (duty 50 % fixed) 15 MHz 30.0 to 36.7 ns (duty variable) 100 kHz 4.90 to 5.10µ s WF1943B...

  • Page 137: Section 8 Specifications

    8.1 Waveform and output characteristics ·········································································8-2 8.2 Output voltage ···········································································································8-4 8.3 Other functions ··········································································································8-5 8.4 Initialized settings······································································································8-9 8.5 Remote control ··········································································································8-10 8.6 General items ·············································································································8-11 External drawing································································································8-12 Guaranteed values are shown with tolerance, values without tolerance are for reference. WF1943B...

  • Page 138: Waveform And Output Characteristics

    Arbitrary waveform data edit Point specification and linear interpolation by the panel operation or data writing by GPIB or USB Arbitrary waveform data 16 bits (-32768 to 0 to +32767) resolution For output waveform, upper 14 bits are output. WF1943B...
  • Page 139 Up to 1 MHz: ±1 % of the period 1 MHz to 10 MHz: ±3 % of the period 10 MHz to 15 MHz: ±5 % of the period (duty variable) Up to 100 kHz: ±1 % of the period Jitter: 30 nsp-p and below WF1943B...

  • Page 140: Output Voltage

    Output voltage can be set with high and low level buttons. SYNC OUT Output voltage (SYNC OUT) Output voltage 0/+5V (open) Output waveform Rise/fall time 2.5 ns 50 Ω, unbalanced Output impedance 45 Ω and more Load impedance Output connector Front panel BNC receptacle (SYNC OUT) WF1943B...

  • Page 141: Other Functions

    Trigger jitter Less than 50 ns Oscillation stop level On and off settable Off: stops at set phase. On: stops at set stop level. −100.0 % (maximum negative output) to +100.0 % (maximum Range positive output), Resolution 0.01 % WF1943B...
  • Page 142 4 digits at 1 ms and more, 1 µs at less than 1 ms. Oscillation stop level On/off setting effective during gated sweep. Off: stop at set phase. On: stop at set stop level. −100.00 %（maximum negative output) to +100.00 % (maximum Range positive output) Resolution 0.01 % WF1943B...
  • Page 143 Internal modulation frequency Range 0.1 mHz to 500.00 Hz Resolution 5 digits at 1 Hz and more, 0.1 mHz at less than 1 Hz. Internal modulation waveform Setting initialization Functions Initializes nearly all setting contents. Initialization settings, “3.3 Basic operation(Initialization table)”, WF1943B...
  • Page 144 Battery back up for nearly all settings prior to power off. Backup period Three years and more under normal temperature. Battery Lithium cell Operation when battery depleted Error at power on and settings are initialized. Setting memory and arbitrary waveform memory are initialized. Battery needs replacement (fee charged) WF1943B...

  • Page 145: Initialized Settings

    User unit computation formula (h+n)*m User unit coefficient User unit offset Arbitrary waveform selection 0: ARB_00 Arbitrary waveform name ARB_00 ~ ARB_11 Arbitrary waveform data size Arbitrary waveform data All 0 Remote control interface GPIB GPIB address GPIB delimiter CR+LF USB ID WF1943B...

  • Page 146: Remote Control

    GPIB parameters GPIB address (0 to 30), delimiter in transmission (CR/LF+EOI, CR+EOI, LF+EOI) Remote release Remote condition can be canceled by LOCAL key. (Except for Local Lockout) Connector Rear panel, IEEE 488 (24-pins) connector USB interface USB1.1 full speed 8-10 WF1943B...

  • Page 147: General Items

    216(W) × 132.5(H) × 290(D) mm (Excluding protrusions). Mass Mainframe excluding attachments, options, etc. Approx. 4.2 kg, Safety EN 61010-1: 2001 EN 61326: 1997/A1: 1998/A2: 2001 However, the performance criteria for the following standards are as follows: EN61000-4-2(1995), EN61000-4-4(1995), EN61000-4-5(1995), and EN61000-4-11(1994):B 8-11 WF1943B...

  • Page 148: External Drawing

    8.3 Other functions External drawing 8-12 WF1943B...

  • Page 149: Index

    LOW························································· 5-5, 5-6 TRIG/SWEEP IN ·················· 3-9, 4-8, 4-10, 4-13, m····························································· 4-44, 5-7 4-19, 4-30, 5-21 M ····································································· 5-7 UNDO ··························································· 5-19 MAN TRIG ···································4-8, 4-11, 5-21 WIDTH ···················································· 5-3, 5-4 MEMORY ····················································· 5-13 µ ······································································ 5-7 Index 1 WF1943B...
  • Page 151 All NF products are warranted against defects in materials and workmanship for a period of one year from the date of shipment. During the warranty period of, NF will, at its option, either will repair the defective product without any charge for the parts and labor, or either repair or replace products which prove to be defective.
  • Page 153 • We assume no responsibility for influences resulting from the operations in this manual. Copyright 2005, NF Corporation WF1943B MULTIFUNCTION SYNTHESIZER Instruction Manual NF Corporation 3-20 Tsunashima Higashi 6-chome, Kohoku-ku. Yokohama-shi...
  • Page 156 NF Corporation 6-3-20, Tsunashima-higashi, Kohoku-ku,Yokohama 223-8508 JAPAN...

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