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Wiltron 681 B Series Operation Manual

Synthesized sweep generator
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SERIES
681XXB
SYNTHESIZED SWEEP GENERATOR
OPERATION MANUAL
490 JARVIS DRIVE
P/N: 10370-10258
REVISION: B
MORGAN HILL, CA 95037-2809
PRINTED: FEBRUARY 1995
COPYRIGHT 1993 WILTRON CO.

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  • Page 1 SERIES 681XXB SYNTHESIZED SWEEP GENERATOR OPERATION MANUAL 490 JARVIS DRIVE P/N: 10370-10258 REVISION: B MORGAN HILL, CA 95037-2809 PRINTED: FEBRUARY 1995 COPYRIGHT 1993 WILTRON CO.
  • Page 2 WARRANTY The WILTRON product(s) listed on the title page is (are) warranted against defects in materials and workmanship for one year from the date of shipment, except for YIG-tuned oscillators and all WILTRON manufactured microwave components, which are warranted for two years.
  • Page 3 EN 55011: 1991, Group 1, Class A EN 50082-1: 1992 IEC 801-2, 1991, Level 3 IEC 801-3, 1984, Level 2 IEC 801-4, 1988, Level 2 Signature Date John Pink Managing Director Wiltron Measurements LTD. Wiltron House Rutherford Close Stevenage Herts, SG1 2EF UNITED KINGDOM...
  • Page 4 TABLE OF CONTENTS Chapter 1 — General Information Chapter 1 provides general information about the WILTRON Series 681XXB Synthesized Sweep Generator. It includes a general description of the sweep generator and information on its identifi- cation number, related manuals, options, and performance specifications. A listing of recommended test equipment is also provided.
  • Page 5 Table of Contents (Continued) Appendix A — Rear Panel Connectors Appendix A provides descriptions of the rear panel connectors on a typical Series 681XXB Synthe- sized Sweep Generator. It includes pinout diagrams and descriptions for the AUX I/O and IEEE- 488 GPIB connectors.

  • Page 6: Table Of Contents

    Chapter 1 General Information Table of Contents SCOPE OF MANUAL ....1-3 INTRODUCTION ....1-3 DESCRIPTION .
  • Page 7 Figure 1-1. Series 681XXB Synthesized Sweep Generator...

  • Page 8: Scope Of Manual

    SCOPE OF MANUAL This manual provides general information, installation, and operating information for the WILTRON Series 681XXB Synthesized Sweep Gen- erator. (Throughout this manual, the terms 681XXB and sweep gener- ator will be used interchangeably to refer to the instrument.) Manual organization is shown in the table of contents.
  • Page 9 GENERAL 681XXB INFORMATION MODELS Table 1-1. Series 681XXB Models 681XXB Frequency Output Power Output Power Model (GHz) w/Optional Attenuator 68137B 2.0 – 20.0 GHz +13 dBm +11 dBm 68147B 0.01 – 20.0 GHz +13 dBm +11 dBm 2.0 – 20.0 GHz +9 dBm +7 dBm 68153B...

  • Page 10: Identification Number

    INFORMATION NUMBER IDENTIFICATION NUMBER All WILTRON instruments are assigned a unique six-digit ID number, such as “301001”. The ID number is imprinted on a decal that is af- fixed to the rear panel of the unit. Special-order instrument configura- tions also have an additional special serial number tag attached to the rear panel of the unit.

  • Page 11: Options

    Option 11, 0.1 Hz Frequency Resolution. Provides frequency resolution of 0.1 Hz. Option 14, WILTRON 360B VNA Compatibility. Modifies rack mounting hardware to mate unit in a WILTRON 360B VNA con- sole. Option 15, High Power Output. Adds high-power RF compo- nents to the instrument providing 50 mW RF output power in the 2–26.5 GHz frequency range.

  • Page 12: Recommended Test Equipment

    GENERAL RECOMMENDED INFORMATION TEST EQUIPMENT RECOMMENDED TEST Table 1-2 lists the recommended test equipment for performing the Se- EQUIPMENT ries 681XXB Synthesized Sweep Generator operation verification tests in Chapter 5. Table 1-2. Recommended Test Equipment Instrument Critical Specification Recommended Manufacturer/Model Frequency Range: 0.01 to 40 GHz EIP Microwave, Inc.
  • Page 13 Chapter 2 Installation Table of Contents INTRODUCTION ....2-3 INITIAL INSPECTION ....2-3 PREPARATION FOR USE .

  • Page 14: Introduction

    WIL- TRON Customer Service. If either the shipping container is damaged or the cushioning material shows signs of stress, notify the carrier as well as WILTRON. Keep the shipping materials for the carrier’s inspec- tion. 681XXB OM...

  • Page 15: Preparation For Use

    PREPARATION INSTALLATION FOR USE PREPARATION FOR USE Preparation for use consists of checking that the rear panel line volt- age selector switch is set for the correct line voltage and connecting the sweep generator to the power source. The following paragraphs provide these procedures along with information about power requirements, warmup times, and the operating environment.

  • Page 16: Standby Operation

    PREPARATION INSTALLATION FOR USE Line Fuse Line Voltage Selector Switch GPIB Connector Figure 2-1. Sweep Generator Rear Panel showing Power Connection Standby Op- Whenever the sweep generator is not being used it eration should be left connected to the power source and LEVEL placed in standby.

  • Page 17: Warmup Time

    PREPARATION INSTALLATION FOR USE Warmup From a cold start (ac power application), the sweep Time generator requires approximately 120 hours (5 days) –7 of warm up to achieve 1 x 10 /day frequency accu- racy and stability. If the Option 16 time base is installed, the 681XXB requires approximately 72 hours (3 days) of warm –10 up to achieve 5 x 10...

  • Page 18: Gpib Setup And Interconnection

    This interconnection is via a standard GPIB cable. The WILTRON Part number for such a cable is 2000-1, -2, or -4 (1, 2, or 4 meters in length). Setting the The default GPIB address is 5.
  • Page 19 GPIB SETUP AND INSTALLATION INTERCONNECTION Now press the menu soft-key Config . The System Configuration Menu (shown below) is displayed. To go to the Configure GPIB menu from this menu, press the menu soft-key GPIB . The Configure GPIB Menu (shown below) is displayed. Press the menu soft-key GPIB Address to change the current GPIB address of the sweep generator.

  • Page 20: Selecting The Line Terminator

    GPIB SETUP AND INSTALLATION INTERCONNECTION Selecting Data is delimited on the GPIB by either the carriage the Line return (CR) ASCII character or both the carriage re- Terminator turn and line feed (CR/LF) ASCII characters. Which character is used depends upon the requirements of the system controller.

  • Page 21: Preparation For Storage/Shipment

    Seal the carton by using either shipping tape or an industrial stapler. Address the Container. If the instrument is being returned to WILTRON for service, mark the address of the appropriate WIL- TRON service center (Table 2-1) and your return ad- dress on the carton in one or more prominent locations.
  • Page 22 WILTRON INSTALLATION SERVICE CENTERS Table 2-1. WILTRON Service Centers UNITED STATES CHINA JAPAN WILTRON COMPANY WILTRON BEIJING SERVICE ANRITSU CORPORATION 490 Jarvis Drive CENTER 1800 Onna Atsugi-shi Morgan Hill, CA 95037-2809 416W Beijing Fortune Building Kanagawa-Prf. 243 Japan Telephone: (408) 778-2000...
  • Page 23 Chapter 3 Local (Front Panel) Operation Table of Contents INTRODUCTION ....3-3 FRONT PANEL LAYOUT ....3-4 Line Key .
  • Page 24 Selecting a Power Level ....3-20 CW Ramp ..... . 3-21 SWEEP FREQUENCY OPERATION .
  • Page 25 3-13 SYSTEM CONFIGURATION ... . 3-67 Configuring the Front Panel ... . 3-68 Configuring the Rear Panel ... . 3-69 Configuring the RF .

  • Page 26: Introduction

    Chapter 3 Local (Front Panel) Operation INTRODUCTION This chapter provides information and instructions on operating the Series 681XXB Synthesized Sweep Generator using the front panel controls. It contains the following: Illustrations and diagrams of the front panel, data display area, and data entry area that identify and describe all front panel con- trols, inputs, and outputs.

  • Page 27: Front Panel Layout

    LOCAL (FRONT FRONT PANEL PANEL) OPERATION LAYOUT FRONT PANEL LAYOUT The 681XXB front panel is divided into two main areas—the data dis- play area and the data entry area. The following paragraphs provide a brief description of the front panel controls, inputs, outputs, and data display and data entry areas as shown in Figure 3-1.

  • Page 28: Data Entry Area

    LOCAL (FRONT FRONT PANEL PANEL) OPERATION LAYOUT Data The data entry area consists of data entry keys and Entry Area controls that provide for (1) changing values for each 681XXB parameter, and (2) terminating the value entry and assigning the appropriate units (GHz, MHz, dBm, etc.).

  • Page 29: Data Display Area

    LOCAL (FRONT DATA DISPLAY PANEL) OPERATION AREA DATA DISPLAY AREA The data display area consists of the data display and the surrounding menu keys. The data display is a dot matrix liquid crystal display (LCD) that provides 16 lines of 40 characters each. Information is pre- sented on the LCD in the form of menu displays.

  • Page 30: Menu Display Format

    LOCAL (FRONT DATA DISPLAY PANEL) OPERATION AREA Menu The menu display is divided into specific areas that Display show the frequency, power level, and modulation in- Format formation for the current sweep generator setup. Menu labels for the current menu’s soft-keys appear along the bottom and right side of the display.

  • Page 31: Menu Keys

    LOCAL (FRONT DATA DISPLAY PANEL) OPERATION AREA Window Display A window display that overlays a portion of the cur- rent menu display is used to (1) show the parameter being edited; (2) display selection lists of preset fre- quencies, power levels, markers, etc.; (3) show the modulation and system configuration choices and current selections;...
  • Page 32 LOCAL (FRONT DATA DISPLAY PANEL) OPERATION AREA MODULATION—This menu provides you with access to sub-menus that let you select the type of signal modulation (AM, FM, or Square Wave) and control the option settings for each type. SYSTEM—This menu provides you with ac- cess to sub-menus that let you (1) reset the in- strument to factory-selected default values;...

  • Page 33: Data Entry Area

    LOCAL (FRONT DATA ENTRY PANEL) OPERATION AREA DATA ENTRY AREA The value of a selected 681XXB parameter can be changed using the rotary data knob and/or keys of the data entry area. Each element of the data entry area is identified in Figure 3-3 and described in the fol- lowing paragraphs.
  • Page 34 LOCAL (FRONT DATA ENTRY PANEL) OPERATION AREA Rotary Data Knob The rotary data knob can be used to change the value of a parameter that is open for editing. The cursor is moved under the open parameter using the < and > pads of the cursor control key. Then, by slowly turning the knob clockwise or counter-clock- wise the value of the parameter is increased or de- creased by the unit size.

  • Page 35: Instrument Start-Up

    LOCAL (FRONT INSTRUMENT PANEL) OPERATION START-UP INSTRUMENT START-UP Now that you have familiarized yourself with the layout of the sweep generator’s front panel controls and data display, you are ready to be- gin operating the instrument. Begin by powering it up. Powering Up Connect the 681XXB to an ac power source by fol- the 681XXB...

  • Page 36: Self-Testing The 681Xxb

    LOCAL (FRONT INSTRUMENT PANEL) OPERATION START-UP Self-Testing The 681XXB firmware includes internal diagnostics the 681XXB that self-test the instrument. These self-test diag- nostics perform a brief go/no-go test of most of the PCBs and other internal assemblies. If the sweep generator fails self-test, an error message is dis- played on the data display.
  • Page 37 LOCAL (FRONT RESET (DEFAULT) PANEL) OPERATION PARAMETERS Table 3-1. Reset (Default) Paramenters 681XXB FREQUENCY PARAMETERS (GHz) MODEL M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 ∆F NUMBER 68137B 3.5 2.0 20.0 2.0 5.0 8.0 11.0 14.0 17.0 20.0 3.5 2.0 20.0 2.0 5.0 8.0 11.0 14.0 17.0 20.0 1.0 68147B 3.5 2.0 20.0 2.0 5.0 8.0 11.0 14.0 17.0 20.0 3.5 2.0 20.0 2.0 5.0 8.0 11.0 14.0 17.0 20.0 1.0 68153B...

  • Page 38: Entering Data

    LOCAL (FRONT ENTERING PANEL) OPERATION DATA ENTERING DATA Before proceeding to the various modes of sweep generator operation, you need to know how to enter data from the front panel. Entering data refers to changing a parameter’s value by editing its current value or entering a new value to replace the current value.

  • Page 39: Editing The Current Value

    LOCAL (FRONT ENTERING PANEL) OPERATION DATA Editing the To change the current value of a parameter by edit- Current ing, you can use either the cursor control key or the Value rotary data knob. Using the Cursor Control Key Cursor Using the <...

  • Page 40: Entering A New Value

    LOCAL (FRONT ENTERING PANEL) OPERATION DATA To close the open parameter when you are finished editing , press Edit F1 or make another menu selec- tion. Entering a To change the current value of a parameter by enter- New Value ing a new value for the parameter, use the data en- try keypad and termination keys.

  • Page 41: Cw Frequency Operation

    LOCAL (FRONT CW FREQUENCY PANEL) OPERATION OPERATION CW FREQUENCY One of the sweep generator’s major functions is to produce discrete OPERATION CW frequencies across the frequency range of the instrument. The fol- lowing paragraphs describe how to place the 681XXB in the CW fre- quency mode, select a CW frequency and power level for output, and activate the CW ramp.
  • Page 42 LOCAL (FRONT CW FREQUENCY PANEL) OPERATION OPERATION Selecting a Preset Frequency To select one of the preset frequencies for output, press the main menu key FREQUENCY CONTROL The CW Frequency Control menu, shown below, is displayed. This menu lets you (1) select preset fre- quencies F0, F1, F2, M1, or M2 for output, (2) go to the frequency list menu, or (3) go to the tagged fre- quencies menu.

  • Page 43: Selecting A Power Level

    LOCAL (FRONT CW FREQUENCY PANEL) OPERATION OPERATION Press Output Freq to output the selected frequency. This frequency is output until you select another fre- quency from the list and press Output Freq . On the frequency list, the output frequency selection is marked by a black square or, if tagged, an F high- lighted in reverse video.

  • Page 44: Cw Ramp

    LOCAL (FRONT CW FREQUENCY PANEL) OPERATION OPERATION NOTE You can also select any of the preset power levels or a power level sweep for a CW frequency. For instructions, refer to the Fixed Power Level Operation and Power Level Sweep Operation sections of this chapter.
  • Page 45 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION SWEEP FREQUENCY The sweep generator can generate broad (full range) and narrow band OPERATION sweeps across the frequency range of the instrument. The 681XXB has three sweep frequency modes—analog sweep, step sweep, and manual sweep.

  • Page 46: Sweep Frequency Operation

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Setting the The duration of the analog sweep can be set for any Analog time in the range of 30 ms to 99 sec. The sweep time Sweep Time parameter is set from the sweep ramp menu. To go to the Analog Sweep Ramp menu (shown be- low) from the Analog Sweep menu, press Sweep Ramp .

  • Page 47: Selecting A Sweep Trigger

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting a The 681XXB provides sweep triggering for analog Sweep frequency sweep, step frequency sweep, and CW Trigger power sweep. The sweep generator has three modes of sweep triggering, each selectable from the trigger menu.

  • Page 48: Selecting Step Sweep Mode

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting In step sweep frequency mode, the output frequency Step Sweep changes in discrete, synthesized steps between se- Mode lected start and stop frequencies. Step sweeps can be from a high frequency to a low frequency and vice versa.
  • Page 49 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Setting Step There are two ways to set the size of each step of Size and the step sweep—set the step size or set the number Dwell Time of steps. The step size range is 1 kHz to the full fre- quency range of the sweep generator (0.1 Hz to full frequency range with Option 11);...

  • Page 50: Selecting Manual Sweep Mode

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting In manual sweep frequency mode, the output fre- Manual quency can be manually tuned in phase-locked Sweep Mode steps between the selected start and stop frequen- cies using the rotary data knob. As the knob is turned, the current output frequency is displayed on the data display as Fm.

  • Page 51: Selecting A Sweep Range

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting a Selecting a sweep range involves choosing a start Sweep Range and a stop frequency for the frequency sweep. The sweep range selection process is identical for all sweep frequency modes (analog, step, and manual). There are several ways you can select a sweep range, including: Editing the current start and stop frequency...
  • Page 52 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting a Preset Sweep Range There are four preset sweep range parameters, se- lectable in the analog sweep, step sweep, and man- ual sweep frequency modes. The following is a description of each preset sweep range. F1-F2–provides a frequency sweep between the start frequency, F1, and the stop frequency, F3-F4–provides a frequency sweep between...

  • Page 53: Selecting A Power Level

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Setting a Preset Sweep Range–At the menu, se- lect the sweep range (F1-F2, F3-F4, F5-dF, or F6-dF) that you wish to set. The menu then displays the current frequency parameters for the selected sweep range.

  • Page 54: Frequency Markers

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Frequency The sweep generator provides up to 20 independent, Markers pre-settable markers, F0-F9 and M0-M9, that can be used in the analog and step sweep frequency modes for precise frequency identification. Marker frequency accuracy is the same as sweep frequency accuracy.
  • Page 55 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Use the cursor control key to select a frequency pa- rameter from the marker list. The selected fre- quency parameter is highlighted in reverse video and displayed in full below the marker list. Editing a Marker List Frequency If you want to change a selected marker list fre- quency parameter’s value, press Edit to open the...

  • Page 56: Selecting Alternate Sweep Mode

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting In alternate sweep frequency mode, the sweep gen- Alternate erator’s output frequency sweeps alternately be- Sweep Mode tween any two sweep ranges in analog sweep or any two sweep ranges in step sweep. The process of se- lecting and activating the alternate sweep is identi- cal for both analog and step sweep frequency modes.
  • Page 57 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Activating the Alternate Sweep The Alternate Sweep menu soft-key Alt Sweep tog- gles the alternate sweep mode on and off. Press Alt Sweep to turn on the alternate sweep mode. Notice that the Alternate Sweep menu (shown below) changes to show that the alternate sweep is now active.
  • Page 58 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting an Alternate Sweep Range To go to the Alternate Range menu (shown below) from the Alternate Sweep menu, press Alt Range . Select the alternate sweep range (Full, F1-F2, F3-F4, F5-dF, or F6-dF). The menu then displays the cur- rent frequency parameters for the selected sweep range.

  • Page 59: Selecting Fixed Power Level Mode

    LOCAL (FRONT FIXED POWER PANEL) OPERATION LEVEL OPERATION FIXED POWER LEVEL The sweep generator provides leveled output power over a maximum OPERATION range of up to 28 dB (up to 136 dB with Option 2) for CW and sweep frequency operations. Instruments with Option 15 provide leveled out- put power over a maximum range of up to 22 dB (up to 130 dB with Option 2).
  • Page 60 LOCAL (FRONT FIXED POWER PANEL) OPERATION LEVEL OPERATION and appropriate terminator key. To close the open power level parameter, press Edit L1 or make an- other menu selection. Selecting a Preset Power Level To select one of the preset power levels for output, press the main menu key LEVEL CONTROL...
  • Page 61 LOCAL (FRONT FIXED POWER PANEL) OPERATION LEVEL OPERATION Press Tag to mark a selected power level (place an L in front of it). If a power level is already tagged, pressing Tag will untag it (remove the L). Tagging selected power levels lets you quickly switch be- tween them using the scan keys of the Tagged Lev- els menu.

  • Page 62: Level Offset

    LOCAL (FRONT FIXED POWER PANEL) OPERATION LEVEL OPERATION Level Offset Level offset lets you compensate for a device on the sweep generator’s output that alters the RF output power level at the point of interest. For example, the power level at the test device may be less or more than the displayed power level because of the loss through an external transmission line or the gain of an amplifier located between the 681XXB...

  • Page 63: Power Level Sweep Operation

    LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION 3-10 POWER LEVEL The sweep generator provides leveled output power sweeps at CW fre- SWEEP OPERATION quencies and in conjunction with frequency sweeps (analog and step). Power level sweeps can be from a high level to a low level or vice versa.

  • Page 64: Setting Cw Power Sweep Step Size And Dwell Time

    LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION Setting CW There are two ways to set the size of each step of Power Sweep the CW power sweep—set the step size or set the Step Size number of steps. The step size range is 0.01 dB to and Dwell the full power range of the synthesizer;...

  • Page 65: Selecting A Cw Power Sweep Trigger

    LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION Selecting a There are three modes of triggering provided for the CW Power CW power sweep—automatic, external, and single. Sweep The sweep trigger is selectable from the CW Level Trigger Sweep Trigger menu. The following is a description of each trigger mode.

  • Page 66: Selecting A Power Level Sweep Range

    LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION Selecting a Selecting a power level sweep range consists of Power Level choosing a start and stop level for the power level Sweep Range sweep. The power level sweep range selection proc- ess is identical for all power level sweep modes—...
  • Page 67 LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION Selecting a Preset Power Level Sweep Range There are five preset power level sweep range pa- rameters selectable in the power level sweep modes. These preset power level sweep range parameters are L1-L2, L3-L4, L5-L6, L7-L8, and L9-L0. To select one of the preset power level sweep ranges from a Level Sweep menu, press the main menu key LEVEL...

  • Page 68: Selecting A Sweep Frequency / Step Power Mode

    LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION Selecting a In analog sweep frequency/step power mode or step Sweep Fre- sweep frequency/step power mode, a power level quency / Step step occurs after each frequency sweep. The power Power Mode level remains constant for the length of time re- quired to complete each frequency sweep.

  • Page 69: Setting Power Level Step Size

    LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION Setting There are two ways to set the step size of the power Power Level level step that occurs after each frequency sweep– Step Size set the step size or set the number of steps. The step size range is 0.01 dB to the full power range of the synthesizer;...

  • Page 70: Leveling Operations

    LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS 3-11 LEVELING The 681XXB generates leveled output power over a maximum range OPERATIONS of up to 28 dB (up to 136 dB with Option 2). Instruments with Option 15 provide leveled output power over a maximum range of up to 22 dB (up to 130 dB with Option 2).
  • Page 71 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS The ALC Mode menu lets you perform the following: Go to the leveling menu (select the ALC mode of operation). Go to the attenuation menu (decouple the at- tenuator, if equipped, from the ALC system and set the power level and attenuation).
  • Page 72 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS Before going to the Leveling Menu from the ALC Mode menu, select which input (front- or rear- panel) the external ALC signal is connected to. At the ALC Mode menu, press Ext ALC Front to se- lect front panel input, or Ext ALC Rear to select rear panel input.
  • Page 73 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS At the Leveling menu, pressing either Internal or Fixed Gain will turn off external leveling. Press Previous Menu to return to the ALC Mode menu. Fixed Gain In the fixed gain mode, the ALC is disabled. The RF Level DAC and step attenuator (if installed) are used to control the relative power level.

  • Page 74: Attenuator Decoupling

    LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS Attenuator In 681XXBs equipped with option 2 step attenu- Decoupling ators, the ALC and attenuator work in conjunction to provide leveled output power down to –125 dBm. In the normal (coupled) leveling mode, when the de- sired power level is set, the correct combination of ALC level and attenuator setting is determined by the instrument firmware.

  • Page 75: Alc Power Slope

    LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS ALC Power The ALC power slope function lets you compensate Slope for system, cable, and waveguide variations due to changes in frequency, by linearly increasing or de- creasing power output as the frequency increases. As shown in the following illustration, the power slope function provides you with the ability to set both the power slope and the pivot point.
  • Page 76 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS Press Slope On/Off to activate the ALC power slope function. Press Edit Pivot to open the pivot point frequency parameter for editing. Edit the current frequency us- ing the cursor control key or rotary data knob or en- SLOPE ter a new value using the keypad and appropriate When Power Slope is selected ON,...

  • Page 77: User Cal (User Level Flatness Correction)

    LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS User Cal The User Cal (user level flatness correction) func- (User Level tion lets you calibrate out path variations with fre- Flatness quency that are caused by external switching, Correction) amplifiers, couplers, and cables in the test setup. This is done by means of an entered power-offset ta- ble from a GPIB power meter or calculated data.
  • Page 78 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS Equipment Setup To create a power-offset table for user level flatness correction, connect the equipment (shown in Figure 3-4) as follows: Step 1 Using a GPIB cable, connect the Power Meter to the 681XXB. Step 2 Calibrate the Power Meter with the Power Sensor.
  • Page 79 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS At the Configure GPIB menu, press More to go to an additional Configure GPIB menu (shown below). Press Pwr Mtr Address to change the address of the power meter on the GPIB (the power meter’s de- fault address is 13).
  • Page 80 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS Place the sweep generator in a fixed power level mode by pressing the main menu key LEVEL/ALC SELECT At the resulting menu display, press Level . The 681XXB is now in fixed (non-swept) power level mode.
  • Page 81 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS STEPS termination key. (The number of points range is 2 to 801.) When you have finished setting the open number-of-points parameter, close it by pressing Edit Points again or by making another menu selection. Now, press Start Cal to begin automatically taking power level correction information at each fre- quency point.
  • Page 82 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS Erasing the Power-Offset Tables from Memory The power-offset tables are stored in non-volatile memory. A master reset is required to erase the con- tents of the tables and reprogram them with default data. To perform a master reset, proceed as follows: NOTE Step 1 With the 681XXB in standby, press and...

  • Page 83: Signal Modulation

    LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION 3-12 SIGNAL MODULATION The sweep generator provides AM, FM, and square wave modulation of the output signal. All modulation modes—AM, FM, and square wave—can be active simultaneously. The following paragraphs provide descriptions and operating instructions for each modulation mode. Use the Amplitude Modulation Mode, Frequency Modulation Mode, and Square Wave Modulation Mode menu maps (Chapter 4, Figures 4-10, 4-11, and 4-12) to follow the menu sequences.
  • Page 84 LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION This menu contains an external AM status window that shows the current menu selections. This menu lets you perform the following: Turn AM on and off. Select the Linear AM (100%/V) or Log AM (10 dB/V) operating mode.

  • Page 85: Frequency Modulation Operating Modes

    LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION Frequency The 681XXB accepts a signal from an external sig- Modulation nal generator and provides frequency modulation of Operating the output signal. FM deviation is proportional to Modes the input voltage, with sensitivity (–6 MHz/V, +10 MHz/V, or +20 MHz/V) selectable from a menu.
  • Page 86 LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION This menu contains an external FM status window that shows the current menu selections. This menu lets you perform the following: Turn FM on/off. Select the Wide or Narrow FM mode. Select FM sensitivity. Select the input connector (front panel or rear panel FM IN) that is connected to the external signal source.

  • Page 87: Square Wave Modulation Operating Modes

    LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION Square Wave The 681XXB provides square wave (pulse) modula- Modulation tion of the output signal using modulating signals Operating from either its internal square wave generator or an Modes external signal generator. The sweep generator’s internal square wave gener- ator outputs modulating signals of 400 Hz, 1 kHz, 7.8125 kHz, and 27.8 kHz.
  • Page 88 LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION Press On/Off to turn square wave modulation on and off. Both the Square Wave status display and the Square Wave modulation status area will reflect your selection. Press Internal/External to select the source of the modulating signal.
  • Page 89 LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION External Source Input Connector Selection If you have selected External to use a modulating signal from an external source, then when you press More the menu shown below is displayed. Press Front/Rear to select the front or rear panel IN connector.

  • Page 90: System Configuration

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION 3-13 SYSTEM The system configuration function provides menus that let you set or CONFIGURATION select instrument configuration items; for example, display intensity, polarity of blanking and video marker outputs, RF on or off during re- trace or between steps,GPIB address and line terminator, and incre- ment sizes for frequency, power level, and time parameters.

  • Page 91: Configuring The Front Panel

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Configuring Configuring the front panel of the sweep generator the Front involves adjusting the intensity level of the data dis- Panel play for ease of viewing. To go to the Configure Front Panel menu from the System Configuration menu, press Front Panel .

  • Page 92: Configuring The Rear Panel

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Configuring Configuring the rear panel of the sweep generator the Rear consists of selecting the polarity of the retrace blank- Panel ing, bandswitch blanking, retrace penlift, and video marker outputs. To go to the Configure Rear Panel menu from the System Configuration menu, press Rear Panel .

  • Page 93: Configuring The Rf

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Configuring Configuring the RF of the 681XXB involves select- the RF ing whether the RF should be on or off during re- trace and during frequency switching in CW and step modes and selecting whether a sweep triggered by a single or external trigger should rest at the top or bottom of the sweep ramp.

  • Page 94: Configuring The Gpib

    SS MODE Press SS Mode to place the sweep generator in a When SS Mode is selected on, this source lock mode for operation with a WILTRON message is displayed (in the fre- Model 360B Vector Network Analyzer. (Refer to...
  • Page 95 LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Press More to go to the additional Configure GPIB menu. Press Previous Menu to return to the System Con- figuration menu. Additional Configure GPIB Menu When you press More the additional Configure GPIB menu, shown below, is displayed. This menu lets you perform the following: Select the model and GPIB address for the power meter that is used to create a user level...

  • Page 96: Setting Increment Sizes

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Setting The Increment menu lets you set the incremental Increment size for editing frequency, power level, and time pa- Sizes rameters. When the increment mode is selected on, these parameter values will increase or decrease by the set amount each time the ∧...

  • Page 97: Saving/Recalling Instrument Setups

    LOCAL (FRONT SAVING/RECALLING PANEL) OPERATION INSTRUMENT SETUPS 3-14 SAVING/RECALLING The 681XXB offers the capability to store up to ten complete front INSTRUMENT SETUPS panel setups. The setups are numbered 0 through 9. The following paragraphs describe how to save and recall front panel setups. Saving Once you have decided that an instrument setup Setups...

  • Page 98: Erasing Stored Setups

    LOCAL (FRONT SAVING/RECALLING PANEL) OPERATION INSTRUMENT SETUPS Erasing The front panel setups are stored in non-volatile Stored memory. A master reset is required to erase the con- Setups tents of the setups and reprogram them with de- fault data. To perform a master reset, proceed as follows: NOTE Step 1 With the 681XXB in standby, press and...

  • Page 99: Secure Operation

    LOCAL (FRONT SECURE PANEL) OPERATION OPERATION 3-15 SECURE OPERATION The 681XXB can be operated in a secure mode of operation. In this se- cure mode, the display of all frequency, power level, and modulation parameters is disabled during both local (front panel) and remote (GPIB) operations.
  • Page 100 Chapter 4 Local Operation–Menu Maps Table of Contents INTRODUCTION ....4-3 MENU MAP DESCRIPTION ... . 4-3...
  • Page 101 Chapter 4 Local Operation–Menu Maps INTRODUCTION This chapter provides menu maps that support the 681XXB front panel operating instructions found in Chapter 3. It includes menu maps for all of the frequency, power level, and modulation modes of op- eration. In addition, a menu map for system configuration is also pro- vided.

  • Page 102: Sample Menu Map

    LOCAL OPERATION SAMPLE –MENU MAPS MENU MAP Main Menu Key Cursor A Main Typical Menu Soft-Key Points To The Menu Displayed Whenever (Indicates The Active Menu Display Functional Description The Menu Soft-Key Is Depressed Main Menu Key) CW/SWEEP Edit Current SELECT Frequency FREQUENCY...

  • Page 103: Cw Frequency Mode Menu Map

    LOCAL OPERATION –MENU MAPS FREQUENCY MODE CW/SWEEP Edit Current SELECT Frequency FREQUENCY Edit Highlighted CONTROL Frequency LEVEL/ALC SELECT Set Slave Edit Current DF Frequency Set Slave Frequency LEVEL CONTROL Power Level Offset in 360B VNA Mode Set Slave Main MODULATION Power Level Set Slave Power Level Set Slave Alternate...

  • Page 104: Analog Sweep Frequency Mode Menu Map

    LOCAL OPERATION ANALOG SWEEP –MENU MAPS FREQUENCY MODE CW/SWE EP Edit Start Frequency SELECT FREQUENCY Edit End Frequency CONTROL LEVEL/ALC Edit Current SELECT Sweep Time LEVEL CONTROL On / Off MODULATION On / Off SYSTEM On / Off Triggers Single Sweep On / Off On / Off Edit Alt Sweep...

  • Page 105: Step Sweep Frequency Mode Menu Map

    LOCAL OPERATION STEP SWEEP –MENU MAPS FREQUENCY MODE CW/SWE EP Edit Start Frequency SELECT FREQUENCY Edit End Frequency CONTROL Edit Dwell LEVEL/ALC SELECT Time LEVEL Edit Step CONTROL Size On / Off MODULATION Edit Number On / Off SYSTEM of Steps On / Off On / Off Edit Alt Sweep...

  • Page 106: Manual Sweep Frequency Mode Menu Map

    LOCAL OPERATION MANUAL SWEEP –MENU MAPS FREQUENCY MODE CW/SWEEP Edit Start Frequency SELECT FREQUENCY Edit End Frequency CONTROL LEVEL/ALC Edit Step Size SELECT LEVEL Edit Number of Steps CONTROL MODULATION SYSTEM CW/SWEEP Edit Start Frequency SELECT FREQUENCY Edit End Frequency CONTROL LEVEL/ALC SELECT...

  • Page 107: Fixed Power Level Mode Menu Map

    LOCAL OPERATION FIXED POWER –MENU MAPS LEVEL MODE CW/SWEEP Edit Current SELECT Power Level FREQUENCY CONTROL LEVEL/ALC SELECT Edit Power LEVEL Level Offset CONTROL MODULATION On/Off Level Offset SYSTEM * Display Showing Level Offset On Edit Current Tag/Untag Highlighted CW/SWEEP Power Level Power Level SELECT...
  • Page 108 LOCAL OPERATION CW POWER –MENU MAPS SWEEP MODE CW/SWEEP Edit Start Power Level SELECT FREQUENCY Edit End Power Level CONTROL Edit Dwell TIme LEVEL/ALC SELECT Edit Step Size LEVEL On/Off CONTROL Edit Number of Steps MODULATION On/Off SYSTEM On/Off CW/SWEEP Edit Start Power Level SELECT FREQUENCY...

  • Page 109: Sweep Frequency/Step Power Mode Menu Map

    LOCAL OPERATION SWEEP FREQUENCY/ –MENU MAPS STEP POWER MODE CW/SWEEP Edit Start Power Level SELECT FREQUENCY Edit End Power Level CONTROL LEVEL/ALC SELECT LEVEL Edit Step Size CONTROL MODULATION Edit Number of Steps SYSTEM CW/SWEEP Edit Start Power Level SELECT FREQUENCY Edit End Power Level CONTROL...

  • Page 110: Leveling Modes Menu Map

    LOCAL OPERATION LEVELING –MENU MAPS MODES Selects Internal ALC (Default Mode) CW/SWEEP SELECT Selects External ALC FREQUENCY CONTROL (External Detector Input) Selects Front Panel LEVEL/ALC Selects External ALC SELECT External ALC Input Power Meter Input LEVEL CONTROL Selects Rear Panel Selects ALC Off External ALC Input MODULATION...

  • Page 111: Amplitude Modulation Mode Menu Map

    LOCAL OPERATION AMPLITUDE –MENU MAPS MODULATION MODE CW/SWEEP AM On /Off SELECT Log AM (10dB/V) -or- FREQUENCY CONTROL Linear AM (100%/V) LEVEL/ALC SELECT 600Ω -or- 50Ω LEVEL CONTROL Input Impedance MODULATION Front Panel Input -or- Rear Panel Input SYSTEM CW/SWEEP SELECT FREQUENCY CONTROL...

  • Page 112: Frequency Modulation Mode Menu Map

    LOCAL OPERATION FREQUENCY –MENU MAPS MODULATION MODE FM On /Off CW/SWE EP SELECT Wide FM Mode -or- FREQUENCY CONTROL Narrow FM Mode Select LEVEL/ALC Sensitivity SELECT 600Ω -or- 50Ω LEVEL CONTROL Input Impedance MODULATION Front Panel Input -or- SYSTEM Rear Panel Input CW/SWE EP SELECT FREQUENCY...

  • Page 113: Square Wave Modulation Mode Menu Map

    LOCAL OPERATION SQUARE WAVE –MENU MAPS MODULATION MODE Internal Square Wave Source Selected Square Wave CW/ S WEEP SELECT Modulation On/Off Internal Square Wave Source -or- F RE Q UE N CY CONT ROL External Square Wave Source LOW Level Triggers RF -or- LEVEL/ A LC SELECT HIGH Level Triggers RF...

  • Page 114: System Configuration Menu Map

    LOCAL OPERATION SYSTEM –MENU MAPS CONFIGURATION CW/SWEEP Brightens The Display SELECT FREQUENCY Dims The Display CONTROL LEVEL/ALC SELECT LEVEL CONTROL MODULATION SYSTEM Select +5V or -5V Level For Retrace and Bandswitch Blanking Select Normally Open or Closed Pen Lift Relay Contacts Select +5V or -5V level for Video Markers Select RF On or Off...
  • Page 115 Chapter 5 Operation Verification Table of Contents INTRODUCTION ....5-3 TEST EQUIPMENT ....5-3 TEST RECORDS .

  • Page 116: Introduction

    Chapter 5 Operation Verification INTRODUCTION This chapter contains three operation verification tests that can be used to verify Series 681XXB Synthesized Sweep Generator operation. Setup instructions and performance procedures are included for each test. The results can be compared with the specified limits that are shown on the test record forms that are provided for each test.

  • Page 117: Initial 681Xxb Checkout

    OPERATION INITIAL 681XXB VERIFICATION CHECKOUT INITIAL 681XXB Before starting the operation verification tests in this chapter, perform CHECKOUT an initial checkout of the 681XXB to be tested. This initial checkout consists of applying power to the sweep generator, verifying that it passes self-test, and resetting it to the factory default parameters.

  • Page 118: Cw Frequency Accuracy Test

    OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST CW FREQUENCY The following test verifies that the CW frequency output of the sweep ACCURACY TEST generator is within accuracy specifications. Table 5-2, beginning on page 5-7, contains test records that you can copy and use to record test results for this test.

  • Page 119: Test Procedure

    OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Test The following procedure tests both the coarse and Procedure fine loops to verify the accuracy of the CW frequency output. Step 1 Set up the 681XXB as follows: a. Reset the instrument by pressing SYSTEM , then RESET .
  • Page 120 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Table 5-2A. CW Frequency Accuracy Test Record (for Standard Models) (1 of 2) Model 681 _ _ B Serial No. ____________________ Date ___________ 68137B / 68147B 68153B / 68159B 2.000 000 000* _____________________ 2.000 000 000* _____________________ 5.000 000 000 _____________________...
  • Page 121 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Table 5-2A. CW Frequency Accuracy Test Record (for Standard Models) (2 of 2) Model 681 _ _ B Serial No. ____________________ Date ___________ 68163B / 68169B 2.000 000 000* _____________________ 5.000 000 000 _____________________ 8.000 000 000 _____________________ 11.000 000 000...
  • Page 122 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Table 5-2B. CW Frequency Accuracy Test Record (for Models with Option 11) (1 of 2) Model 681 _ _ B Serial No. ____________________ Date ___________ 68137B / 68147B 68153B / 68159B 2.000 000 000 0* _____________________ 2.000 000 000 0* _____________________...
  • Page 123 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Figure 5-2B. CW Frequency Accuracy Test Record (for Models with Option 11) (2 of 2) Model 681 _ _ B Serial No. ____________________ Date ___________ 68163B / 68169B 2.000 000 000 0* _____________________ 5.000 000 000 0 _____________________ 8.000 000 000 0 _____________________...

  • Page 124: Test Setup

    OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS POWER LEVEL These tests verify that the power level accuracy and flatness of the ACCURACY AND 681XXB meet specifications. Table 5-3, beginning on page 5-17, con- FLATNESS TESTS tains test records that you can copy and use to record test results for these tests.

  • Page 125: Power Level Accuracy Test Procedure

    OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Power Level Power level accuracy is checked by stepping the Accuracy power down in 1 dB increments from its maximum Test Proce- rated power level. dure Step 1 Set up the 681XXB as follows: a.

  • Page 126: Power Level Flatness Test Procedure

    OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Power Level Power level flatness is checked by measuring the Flatness Test power level variation during a full band sweep; first Procedure in the step sweep mode, then in the analog sweep mode.
  • Page 127 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS g. Now, return to the Step Sweep menu by pressing the main menu key CW/SWEEP SELECT h. At the Step Sweep menu, press Sweep Ramp to go to the Step Sweep Ramp menu. i.
  • Page 128 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Step 3 Set up the 681XXB as follows for an ana- log sweep power level flatness test: a. Reset the instrument by pressing , then Reset . The CW SYSTEM Menu is displayed. b.
  • Page 129 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS h. At the Analog Sweep menu, press the menu soft-key Sweep Ramp to go to the Analog Sweep Ramp menu. i. Press Sweep Time to open the sweep time parameter for editing. j.
  • Page 130 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (1 of 24) Model 68137B Serial No. ____________________ Date ___________ Model 68137B (without Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power Measured Power +13 dBm...
  • Page 131 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (2 of 24) Model 68137B Serial No. ____________________ Date ___________ Model 68137B (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power Measured Power +11 dBm...
  • Page 132 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (3 of 24) Model 68137B w/Option 15 Serial No. ____________________ Date ___________ Model 68137B with Option 15 High Power (without Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power...
  • Page 133 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (4 of 24) Model 68137B w/Option 15 Serial No. ____________________ Date ___________ Model 68137B with Option 15 High Power (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power...
  • Page 134 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (5 of 24) Model 68147B Serial No. ____________________ Date ___________ Model 68147B (without Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz) Set Power...
  • Page 135 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (6 of 24) Model 68147B Serial No. ____________________ Date ___________ Model 68147B (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz) Set Power...
  • Page 136 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (7 of 24) Model 68147B w/Option 15 Serial No. ____________________ Date ___________ Model 68147B with Option 15 High Power (without Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz)
  • Page 137 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (8 of 24) Model 68147B w/Option 15 Serial No. ____________________ Date ___________ Model 68147B with Option 15 High Power (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz)
  • Page 138 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (9 of 24) Model 68153B Serial No. ____________________ Date ___________ Model 68153B (without Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz) (CW Frequency = 22.0 GHz) Set Power...
  • Page 139 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (10 of 24) Model 68153B Serial No. ____________________ Date ___________ Model 68153B (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz) (CW Frequency = 22.0 GHz) Set Power...
  • Page 140 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (11 of 24) Model 68153B w/Option 15 Serial No. ____________________ Date ___________ Model 68153B with Option 15 High Power (without Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz)
  • Page 141 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (12 of 24) Model 68153B w/Option 15 Serial No. ____________________ Date ___________ Model 68153B with Option 15 High Power (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz)
  • Page 142 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (13 of 24) Model 68159B Serial No. ____________________ Date ___________ Model 68159B (without Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz)
  • Page 143 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (14 of 24) Model 68159B Serial No. ____________________ Date ___________ Model 68159B (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz)
  • Page 144 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (15 of 24) Model 68159B w/Option 15 Serial No. ____________________ Date ___________ Model 68159B with Option 15 High Power (without Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy *...
  • Page 145 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (16 of 24) Model 68159B w/Option 15 Serial No. ____________________ Date ___________ Model 68159B with Option 15 High Power (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy *...
  • Page 146 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (17 of 24) Model 68163B Serial No. ____________________ Date ___________ Model 68163B (without Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz) (CW Frequency = 25.0 GHz) Set Power...
  • Page 147 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (18 of 24) Model 68163B Serial No. ____________________ Date ___________ Model 68163B (with Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz) (CW Frequency = 25.0 GHz) Set Power...
  • Page 148 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (19 of 24) Model 68163B w/Option 15 Serial No. ____________________ Date ___________ Model 68163B with Option 15 High Power (without Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz)
  • Page 149 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (20 of 24) Model 68163B w/Option 15 Serial No. ____________________ Date ___________ Model 68163B with Option 15 High Power (with Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz)
  • Page 150 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (21 of 24) Model 68169B Serial No. ____________________ Date ___________ Model 68169B (without Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz)
  • Page 151 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (22 of 24) Model 68169B Serial No. ____________________ Date ___________ Model 68169B (with Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz)
  • Page 152 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (23 of 24) Model 68169B w/Option 15 Serial No. ____________________ Date ___________ Model 68169B with Option 15 High Power (without Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy *...
  • Page 153 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (24 of 24) Model 68169B w/Option 15 Serial No. ____________________ Date ___________ Model 68169B with Option 15 High Power (with Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy *...
  • Page 154 Chapter 6 Operator Maintenance Table of Contents INTRODUCTION ....6-3 ERROR AND WARNING/STATUS MESSAGES . . 6-3 Self-Test Error Messages ....6-3 Normal Operation Error and Warning/Status Messages .

  • Page 155: Introduction

    Chapter 6 Operator Maintenance INTRODUCTION This chapter provides the information necessary for operator mainte- nance of the sweep generator. Operator maintenance is limited to trou- bleshooting and repairs that can be made without removing the instru- ment covers. ERROR AND During normal operation, the 681XXB generates error messages to in- WARNING/STATUS dicate internal malfunctions, abnormal signal generator operations, or...
  • Page 156 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Table 6-1. Self-Test Error Messages (1 of 4) Error Message Description/Remarks Error 100 Indicates a calibration-related problem. Do Not Attempt to Operate! Refer the DVM Ground Offset Failed instrument to a qualified service technician. Error 101 Indicates either a calibration-related problem or a defective+10 Volt reference.
  • Page 157 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Table 6-1. Self-Test Error Messages (2 of 4) Error Message Description/Remarks Error 115 Indicates failure of the not phase-locked indicator circuit. The 681XXB is still Not Locked Indicator Failed operable but an error message will not appear on the data display when the output frequency is not phase-locked.
  • Page 158 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Table 6-1. Self-Test Error Messages (3 of 4) Error Message Description/Remarks Error 129 Indicates a failure of either the switched filter or level detector circuitry. The Switched Filter or Level 681XXB may or may not produce an RF output. Use caution and always determine Detector Failed the output power level when operating the 681XXB in this condition.
  • Page 159 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Table 6-1. Self-Test Error Messages (4 of 4) Error Message Description/Remarks Error 142 Indicates a failure of the sample and hold circuitry on the A10 PCB. The 681XXB Sample and Hold Circuit still operates normally but the RF output may be unleveled during square wave Failed modulation.
  • Page 160 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Normal When an abnormal condition is detected during op- Operation eration, the 681XXB displays an error message to in- Error and dicate that the output is abnormal or that a signal Warning/ input or data entry is invalid. It also displays warn- Status ing messages to alert the operator to conditions that Messages...
  • Page 161 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Table 6-3. Possible Warning/Status Messages during Normal Operation Warning/Status Description Message This warning message indicates that the 100 MHz OVN COLD Crystal oven (or the 10 MHz Crystal oven if Option 16 is installed) has not reached operating temperature.

  • Page 162: Troubleshooting

    OPERATOR MAINTENANCE TROUBLESHOOTING TROUBLESHOOTING Table 6-4 provides procedures for troubleshooting common malfunc- tions encountered during operation of the sweep generator. Included are procedures for troubleshooting faults that do not produce error mes- sages, such as, failure to power up and unexpected shutdown. Table 6-4.
  • Page 163 OPERATOR MAINTENANCE TROUBLESHOOTING Table 6-4. Troubleshooting (2 of 3) Sweep Generator Quits During Operation (OPERATE light remains on) Trouble Description: The sweep generator operates for some time, then shuts down (OPERATE light remains on). After a short period, the sweep generator resumes normal operation. This is an indication that the 681XXB has reached an excessive operating temperature.
  • Page 164 OPERATOR MAINTENANCE TROUBLESHOOTING Table 6-4. Troubleshooting (3 of 3) UNLEVELED is Displayed Trouble Description: This message is displayed to indicate that the RF output is unleveled. Step 1 Check that the output power does not exceed the specified leveled-power rating and that the RF OUTPUT connector is terminated into a 50Ω...

  • Page 165: Routine Maintenance

    OPERATOR ROUTINE MAINTENANCE MAINTENANCE ROUTINE MAINTENANCE Routine maintenance that can be performed by the operator consists of replacing a defective line fuse, cleaning the fan filter, and cleaning the data display. Replacing The value of the line fuse used in the 681XXB is de- the Line Fuse termined by the line voltage selection—a 5A line fuse for 110 Vac line voltage;...

  • Page 166: Cleaning The Fan Filter

    OPERATOR ROUTINE MAINTENANCE MAINTENANCE Cleaning the The sweep generator must always receive adequate Fan Filter ventilation. A blocked fan filter can cause the instru- ment to overheat and shut down. Check and clean the rear panel fan honeycomb filter periodically. Clean the fan honeycomb filter more frequently in dusty environments.
  • Page 167 Chapter 7 Use With Other Instruments Table of Contents INTRODUCTION ....7-3 MASTER-SLAVE OPERATION ... 7-4 Connecting the 68XXXBs .

  • Page 168: Introduction

    It contains the following: Instructions for interconnecting and operating any two 68XXXBs in a master-slave configuration. Instructions for connecting the 681XXB to a WILTRON Model 562 Scalar Network Analyzer so that it can be used as a signal source for the analyzer.

  • Page 169: Master-Slave Operation

    “MASTER” to the rear panel AUX gether for Master-Slave operations, I/O connector on the Master 68XXXB. always use a WILTRON Master- Connect the AUX I/O cable labeled Slave interface cable set, Part No. “SLAVE” to the rear panel AUX I/O con- ND36329.

  • Page 170: Initiating Master-Slave Operation

    USE WITH MASTER-SLAVE OTHER INSTRUMENTS OPERATION to the appropriate connections on the DUT. Initiating The following paragraphs describe how to set up Master-Slave both 68XXXBs to perform master-slave operations. Operation Use the CW Frequency Mode menu map (Chapter 4, Figure 4-2) to follow the menu sequences. To initiate master-slave operation, turn on both 68XXXBs and place them in CW mode.
  • Page 171 USE WITH MASTER-SLAVE OTHER INSTRUMENTS OPERATION NOTE Upon reset, the slave frequencies (F0 - F9 and M0 - M9) return to the default values shown here. This menu lets you edit the listed frequencies for the Slave 68XXXB. Use the cursor control key to select a frequency pa- rameter from the list, then press Edit to edit its value.

  • Page 172: Master-Slave Operation In Vna Mode

    USE WITH MASTER-SLAVE OTHER INSTRUMENTS OPERATION pad and appropriate termination key. When you have finished setting the open parameter, close it by pressing its menu soft-key or by making another menu selection. Press Enable to begin master-slave operation. Press CW to return to the CW menu. Master-Slave During master-slave operation, the Slave unit is in Operation...
  • Page 173 USE WITH MASTER-SLAVE OTHER INSTRUMENTS OPERATION Press VNA Menu to go to the VNA Menu display (below). This menu lets you set the frequency offset and out- put power level for the Slave 68XXXB in the VNA mode. Press VNA Offset to open the slave frequency off- set parameter.

  • Page 174: Terminating Master-Slave Operation

    USE WITH MASTER-SLAVE OTHER INSTRUMENTS OPERATION Terminating The following describes how to terminate master- Master-Slave slave operation and return the Slave 68XXXB to lo- Operation cal (front panel) control. On the Master 68XXXB, select CW mode. At the CW Menu, press Master Slave to go to the Master Slave Menu display.

  • Page 175: Connecting The 681Xxb To The 562

    USE WITH A 562 SCALAR OTHER INSTRUMENTS NETWORK ANALYZER USE WITH A 562 The 681XXB is directly compatible with the WILTRON Model 562 Sca- SCALAR NETWORK lar Network Analyzer (SNA). The following paragraphs provide in- ANALYZER structions for connecting the sweep generator to the 562 SNA so that is can be used as a signal source for the analyzer.
  • Page 176 USE WITH OPERATION WITH A 562 OTHER INSTRUMENTS SCALAR NETWORK ANALYZER 681XXB rear panel IEEE-488 GPIB con- nector. Step 3 Turn on the 681XXB and the 562. The system is now ready to operate. Using Discrete Cables Connect the 681XXB to the 562 SNA as follows: Step 1 Connect one end of a coaxial cable to the 681XXB rear panel HORIZ OUT connec-...

  • Page 177: Use With A 360B Vna

    USE WITH A 360B VECTOR OTHER INSTRUMENTS NETWORK ANALYZER USE WITH A 360B The 681XXB sweep generator is compatible with the WILTRON Model VECTOR NETWORK 360B Vector Network Analyzer (VNA). The following paragraphs pro- ANALYZER vide instructions for connecting the 681XXB to the 360B VNA and con- figuring the sweep generator so that it can operate as a signal source for the analyzer.

  • Page 178: Modes Of Operation

    USE WITH USE WITH A 360B VECTOR OTHER INSTRUMENTS NETWORK ANALYZER If the 681XXB contains an Option 16 high-stability time base, connect the coax- ial cable between the 681XXB rear panel 10 MHz REF OUT connector and the 360B rear panel 10 MHz REF IN connector. Step 3 Connect one end of a GPIB cable, 1 meter in length, to the 681XXB rear panel IEEE-...
  • Page 179 USE WITH USE WITH A 360B VECTOR OTHER INSTRUMENTS NETWORK ANALYZER At the System Configuration menu, press GPIB . The Configure GPIB Menu (shown below) is dis- played. Verify that the GPIB address and terminator shown on the display match the System Bus source ad- dress and data terminator that are set on the 360B VNA.

  • Page 180: Tracking Mode

    USE WITH USE WITH A 360B VECTOR OTHER INSTRUMENTS NETWORK ANALYZER Terminating 360B Source Lock Mode Opera- tions To terminate 360B VNA source lock mode opera- tions, you must first return the 681XXB to local con- trol and then turn off the SS Mode. To return the 681XXB to local control, turn off the 360B VNA.
  • Page 181 USE WITH USE WITH A 360B VECTOR OTHER INSTRUMENTS NETWORK ANALYZER If the address of the 681XXB on the System Bus needs changing, press GPIB Address . Enter the new address using the cursor control key or the data entry keypad and the terminator key ADRS The new GPIB address will appear on the display.
  • Page 182 Appendix A Rear Panel Connectors INTRODUCTION This appendix provides descriptions for the rear panel connectors on a typical Series 681XXB Synthesized Sweep Generator. REAR PANEL Figure A-1 provides a illustration of the rear panel and describes the CONNECTORS rear panel connectors. Figures A-2 and A-3 provide pinout diagrams and descriptions for the CONNECTOR PINOUT DIAGRAMS...
  • Page 183 0V erator (master-slave operation) and with other to 10V ramp. BNC connector, 50Ω impedance. WILTRON instruments such as the WILTRON 10 MHz REF IN: Accepts an external 10 MHz 562 Scalar Network Analyzer. A pinout diagram ±100 Hz, 0 to 10 dBm time-base signal.
  • Page 184 REAR PANEL CONNECTORS FM IN: Accepts an external modulating signal DWELL IN: Accepts an external TTL low-level to produce FM on the RF output. FM sensitivity signal to stop the sweep in both analog- and step-sweep modes. The sweep resumes when and input impedance (50Ω...
  • Page 185 REAR PANEL CONNECTOR CONNECTORS PINOUT DIAGRAMS AUX I/O SIGNAL NAME SIGNAL DESCRIPTION HORIZ OUTPUT Horizontal Sweep Output: Provides a 0V at beginning and +10V at end of sweep for all sweep modes, regardless of sweep width. In the CW mode, the voltage is proportional to frequency between 0V at low end and +10V at the high end of range.
  • Page 186 REAR PANEL CONNECTOR CONNECTORS PINOUT DIAGRAMS SIGNAL NAME SIGNAL DESCRIPTION V/GHz Output: Provides a reference voltage relative to the RF output frequency V/GHz (1.0 V/GHz for Models 68137B and 68147B; 0.5 V/GHz for Models 68153B, 68159B, 68163B, and 68169B). EOS INPUT End-of-Sweep Input: Accepts a TTL high-level signal to tell the sweep generator to begin the end of sweep dwell.
  • Page 187 REAR PANEL CONNECTOR CONNECTORS PINOUT DIAGRAMS IEEE-488 GPIB 13 14 15 16 17 18 19 20 21 22 23 24 9 10 11 12 SIGNAL NAME SIGNAL DESCRIPTION DIO 1 thru DIO 4 Data Input/Output: Bits are HIGH when the data is logical 0 and LOW when the data is logical 1.
  • Page 188 Appendix B Performance Specifications FREQUENCY MODEL SUMMARY CW MODE Model Frequency Range Output Power Output: Twenty independent, presettable CW frequencies 68137B 2.0 to 20.0 GHz +13 dBm (F0 – F9 and M0 – M9). Accuracy: Same as internal or external 10 MHz time base. 68147B 0.01 to 20.0 GHz +13 dBm...
  • Page 189 10 MHz to ≤2 GHz: <–40 dBc >2 GHz to ≤40 GHz: <–60 dBc 360B VNA SOURCE LOCK MODE Under control of the WILTRON 360B Vector Network Ana- SINGLE-SIDEBAND PHASE NOISE lyzer, the synthesized sweep generator is phase-locked at a (dBc/Hz) typical <7 ms/step sweep speed.
  • Page 190 PERFORMANCE SPECIFICATIONS RESIDUAL FM RF OUTPUT (50 Hz - 15 kHz BW) Power level specifications apply at 25 ° ± 10 ° C. MAXIMUM LEVELED OUTPUT POWER Frequency Range Residual FM (GHz) (Hz RMS) Output Power Output 0.01 to ≤8.4 <120 Model with Attenuator...
  • Page 191 PERFORMANCE SPECIFICATIONS POWER LEVEL SWITCHING TIME (to within specified OUTPUT ON/OFF: Toggles the RF output between an Off accuracy): and On state. During the Off state, the RF oscillator is turned Without Change in Step Attenuator: <50 µs off. The On or Off state is indicated by two LEDs located below the OUTPUT ON/OFF key on the front panel.
  • Page 192 Wide Mode: 0 to 100 MHz peak minimum, DC to Emulations: The instrument responds to the published 100 Hz rates. GPIB commands and responses of the WILTRON Models Distortion at 1 kHz: <10% typical Maximum Input: ±5V 6600 and 6700 signal sources. When emulating another sig-...
  • Page 193 PERFORMANCE SPECIFICATIONS GENERAL Warm Up Time (Standard Time Base): From Standby: 30 minutes. Stored Setups: Stores front panel settings and nine addi- –7 From Cold Start (0°C): 120 hours to achieve <1 x 10 tional front-panel setups in a non-volatile RAM. A system per day frequency stability.
  • Page 194 Model 562 Scalar Network Ana- lyzer and other WILTRON instruments. For a pinout diagram EXT ALC IN (External ALC Input): Provides for leveling the RF output signal externally with either a detector or power and descriptions, see Appendix A, Figure A-2.
  • Page 195 Option 11, 0.1 Hz Frequency Resolution: Provides fre- quency resolution of 0.1 Hz. Option 14, WILTRON 360B VNA Compatibility: Modifies rack mounting hardware to mate unit in a WILTRON 360B VNA console. Option 15, High Power Output: Add s hig h-p owe r RF components to the instrument in the 2-20 GHz frequency range.

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