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Anritsu 681 C Series Operation Manual

Anritsu 681 C Series Operation Manual

Synthesized signal generator
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Summary of Contents for Anritsu 681 C Series

  • Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
  • Page 2 SERIES 681XXC SYNTHESIZED SIGNAL GENERATOR OPERATION MANUAL 490 JARVIS DRIVE P/N: 10370-10333 MORGAN HILL, CA 95037-2809 REVISION: B PRINTED: APRIL 2001 COPYRIGHT 1999 ANRITSU CO.
  • Page 3 WARRANTY The Anritsu product(s) listed on the title page is (are) warranted against defects in materials and workmanship for one year from the date of shipment. Anritsu’s obligation covers repairing or replacing products which prove to be defective during the warranty period.
  • Page 5 Safety Symbols To prevent the risk of personal injury or loss related to equipment malfunction, Anritsu Company uses the following symbols to indicate safety-related information. For your own safety, please read the information carefully BEFORE operating the equipment. WARNING WARNING indicates a hazard. It calls attention to a procedure that could result in personal injury or loss of life if not performed properly.
  • Page 6 For Safety WARNING When supplying power to this equipment, always use a three-wire power cable connected to a three-wire power line outlet. If power is supplied without grounding the equip- ment in this manner, there is a risk of receiving a severe or fatal electric shock.
  • Page 7: Table Of Contents

    Table of Contents Chapter 1 General Information SCOPE OF MANUAL ....1-3 INTRODUCTION ....1-3 DESCRIPTION .
  • Page 8 Table of Contents (Continued) PREPARATION FOR STORAGE/SHIPMENT . . . 2-13 Preparation for Storage ... . . 2-13 Preparation for Shipment ... . 2-13 Chapter 3 Local (Front Panel) Operation INTRODUCTION .
  • Page 9 Table of Contents (Continued) Frequency Modulation Operating Modes ..3-74 Providing Frequency Modulation ..3-75 Square Wave Modulation Operating Modes . . . 3-77 Providing Square Wave Modulation ..3-77 3-13 SYSTEM CONFIGURATION .
  • Page 10 Table of Contents (Continued) Power Level Accuracy Test Procedure ..5-14 Power Level Flatness Test Procedure ..5-15 Chapter 6 Operator Maintenance INTRODUCTION ....6-3 ERROR AND WARNING/STATUS MESSAGES.
  • Page 11 Table of Contents (Continued) Appendix A Rear Panel Connectors INTRODUCTION ....A-1 REAR PANEL CONNECTORS ... A-1 CONNECTOR PINOUT DIAGRAMS .
  • Page 12 Table of Contents (Continued)
  • Page 13 Chapter 1 General Information Table of Contents SCOPE OF MANUAL ....1-3 INTRODUCTION ....1-3 DESCRIPTION .
  • Page 14 Figure 1-1. Series 681XXC Synthesized Signal Generator...
  • Page 15: Scope Of Manual

    SCOPE OF MANUAL This manual provides general information, installation, and operating information for the Anritsu Series 681XXC Synthesized Signal Gen- erator. (Throughout this manual, the terms 681XXC and signal gen- erator will be used interchangeably to refer to the instrument.) Man- ual organization is shown in the table of contents.
  • Page 16 GENERAL 681XXC INFORMATION MODELS Table 1-1. Series 681XXC Models Output Power 681XXC Output Power Frequency Output Power w/Electronic Model w/Step Attenuator Step Attenuator 68117C 0.01 – 8.4 GHz +13.0 dBm +11.0 dBm +9.0 dBm 68137C 2.0 – 20.0 GHz +13.0 dBm +11.0 dBm +3.0 dBm 68147C...
  • Page 17: Identification Number

    IDENTIFICATION INFORMATION NUMBER IDENTIFICATION All Anritsu instruments are assigned a unique six-digit ID number, such as “875012”. The ID number is imprinted on a decal that is af- NUMBER 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 18: Maintenance Manual

    The Anritsu part number for the Main- tenance Manual is 10370-10336. The following options are available. OPTIONS Option 1, Rack Mounting. Rack mount kit containing a set of track slides (90°...
  • Page 19: Performance Specifications

    GENERAL PERFORMANCE INFORMATION SPECIFICATIONS Option 14, Rack Mounting without Chassis Slides. Modifies rack mounting hardware to install unit in a console that has mount- ing shelves. Includes mounting ears and front panel handles. Option 15A, High Power Output. Adds high-power RF compo- nents to the instrument providing increased RF output power in the 2–20 GHz frequency range.
  • Page 20: Recommended Test Equipment

    Option 91 (26.5 to 40 GHz) Option 92 (40 to 60 GHz) Option 93 (60 to 90 GHz) Power Meter, Range: –30 to +20 dBm Anritsu Model ML2437A or ML2438A, (1 mW to 100 mW) with with Power Power Sensors: Sensors MA2474A (0.01 to 40 GHz)
  • Page 21 Chapter 2 Installation Table of Contents INTRODUCTION ....2-3 INITIAL INSPECTION ....2-3 PREPARATION FOR USE .
  • Page 23: Introduction

    Anritsu Customer Service. If either the shipping container is damaged or the cushioning material shows signs of stress, notify the carrier as well as Anritsu. Keep the shipping materials for the carrier’s inspec- tion. 681XXC OM...
  • Page 24: 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 signal generator to the power source. The following paragraphs provide these procedures along with information about power require- ments, warmup times, and the operating environment.
  • Page 25: Standby Operation

    PREPARATION INSTALLATION FOR USE Line Fuse Line Voltage Selector Switch GPIB Connector Figure 2-1. Signal Generator Rear Panel showing Power Connection Whenever the signal generator is not being used it Standby should be left connected to the power source and Operation placed in standby.
  • Page 26: Warmup Time

    PREPARATION INSTALLATION FOR USE Warmup Time From Standby–When placing the 681XXC in op- eration from stand-by, allow 30 minutes warmup to assure stable operation. From a Cold Start (0°C)–The signal generator re- quires approximately 120 hours (5 days) of warm up to achieve specified frequency stability with aging.
  • Page 27: Gpib Setup And Interconnection

    This interconnection is via a standard GPIB cable. The Anritsu 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 28 GPIB SETUP AND INSTALLATION INTERCONNECTION Now press the menu soft-key Config . The System Configuration Menu (below) is displayed. To go to the Configure GPIB menu from this menu, press the menu soft-key GPIB . The Configure GPIB Menu (below) is displayed. Press the menu soft-key GPIB Address to change the current GPIB address of the signal generator.
  • Page 29: Selecting The Line Terminator

    GPIB SETUP AND INSTALLATION INTERCONNECTION Selecting the Data is delimited on the GPIB by either the carriage 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 30: Rack Mounting Kit Installation

    RACK MOUNTING KIT INSTALLATION INSTALLATION RACK MOUNTING KIT The rack mounting kit (Option 1) contains a set of track slides (90° tilt capability), mounting ears, and front panel handles for mounting the INSTALLATION signal generator in a standard equipment rack. The following proce- dure provides instructions for installing the rack mounting hardware on to the instrument.
  • Page 31 (Anritsu P/N 2000-560) to avoid damage to the instrument. Step 7 Insert two green-headed screws through the holes near the rear of the slide assem- bly and into the metric tapped holes in the side of the instrument.
  • Page 32 RACK MOUNTING KIT INSTALLATION INSTALLATION Step 10 Place the right side inner slide assembly onto the instrument case with the handle towards the front of the instrument. Step 11 Insert two green-headed screws through the holes in the slide assembly behind the handle and into the metric tapped holes in the side of the instrument.
  • Page 33: 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 Anritsu for service, mark the address of the appropriate Anritsu service center (Table 2-1) and your return address on the carton in one or more prominent locations.
  • Page 34 ANRITSU INSTALLATION SERVICE CENTERS Table 2-1. ANRITSU Service Centers UNITED STATES FRANCE JAPAN ANRITSU COMPANY ANRITSU S.A ANRITSU CUSTOMER SERVICE LTD. 490 Jarvis Drive 9 Avenue du Quebec 1800 Onna Atsugi-shi Morgan Hill, CA 95037-2809 Zone de Courtaboeuf Kanagawa-Prf. 243 Japan...
  • Page 35 Chapter 3 Local (Front Panel) Operation Table of Contents INTRODUCTION ....3-5 FRONT PANEL LAYOUT....3-6 Line Key .
  • Page 36 Table of Contents (Continued) CW FREQUENCY OPERATION ..3-21 Selecting CW Mode ....3-21 Selecting a CW Frequency ... 3-22 Selecting a Power Level.
  • Page 37 Table of Contents (Continued) 3-11 LEVELING OPERATIONS ... . . 3-60 Selecting a Leveling Mode ... 3-60 Attenuator Decoupling ... . . 3-64 ALC Power Slope .
  • Page 39: Introduction

    Chapter 3 Local (Front Panel) Operation INTRODUCTION This chapter provides information and instructions on operating the Series 681XXC Synthesized Signal 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 controls, inputs, and outputs.
  • Page 40: Line Key

    LOCAL (FRONT FRONT PANEL PANEL) OPERATION LAYOUT FRONT PANEL LAYOUT The 681XXC 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 41: Rf Output Control Key

    LOCAL (FRONT FRONT PANEL PANEL) OPERATION LAYOUT Data Entry The data entry area consists of data entry keys and Area controls that provide for (1) changing values for each 681XXC parameter, and (2) terminating the value entry and assigning the appropriate units (GHz, MHz, dBm, etc.).
  • Page 42: 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 43: Menu Display Format

    LOCAL (FRONT DATA DISPLAY PANEL) OPERATION AREA Menu Display The menu display is divided into specific areas that Format show the frequency, power level, and modulation in- formation for the current signal generator setup. Menu labels for the current menu’s soft-keys appear along the bottom and right side of the display.
  • Page 44: Menu Keys

    LOCAL (FRONT DATA DISPLAY PANEL) OPERATION AREA most cases, when a menu soft-key is pressed, its menu label changes appearance to visually show the On/Off condition. Window Display A window display that overlays a portion of the cur- rent menu display is used to (1) show the parameter being edited;...
  • Page 45 LOCAL (FRONT DATA DISPLAY PANEL) OPERATION AREA sweep. In the Level Sweep mode, this menu lets you select the power sweep range parame- ters to use. 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.
  • Page 46: Data Entry Area

    LOCAL (FRONT DATA ENTRY PANEL) OPERATION AREA DATA ENTRY AREA The value of a selected 681XXC 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 47 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- clockwise the value of the parameter is increased or decreased by the unit size.
  • Page 48: Instrument Start-Up

    LOCAL (FRONT INSTRUMENT PANEL) OPERATION START-UP INSTRUMENT START-UP Now that you have familiarized yourself with the layout of the signal 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 681XXC to an ac power source by fol- the 681XXC...
  • Page 49: Self-Testing The 681Xxc

    LOCAL (FRONT INSTRUMENT PANEL) OPERATION START-UP Self-Testing The 681XXC firmware includes internal diagnostics the 681XXC 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 signal generator fails self-test, an error message is dis- played on the data display.
  • Page 50 LOCAL (FRONT RESET (DEFAULT) PANEL) OPERATION PARAMETERS Table 3-1. Reset (Default) Paramenters (1 of 2) 681XXC FREQUENCY PARAMETERS (GHz) MODEL NUMBER M0 M1 M2 M3 M4 M5 M6 M7 M8 M9 68117C 3.5 2.0 8.4 2.0 5.0 8.0 8.4 8.4 8.4 8.4 3.5 2.0 8.4 2.0 5.0 8.0 8.4 8.4 8.4 8.4 1.0 68137C 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 68147C...
  • Page 51 LOCAL (FRONT RESET (DEFAULT) PANEL) OPERATION PARAMETERS Table 3-1. Reset (Default) Paramenters (2 of 2) STEP SWEEP LEVEL SWEEP 681XXC SWEEP LEVEL MODEL TIME NUMBER OF NUMBER OF OFFSET NUMBER DWELL TIME DWELL TIME STEPS STEPS 68117C 50 ms 1 ms 50 ms 0.0 dB 68137C...
  • Page 52 LOCAL (FRONT ENTERING PANEL) OPERATION DATA ENTERING DATA Before proceeding to the various modes of signal 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 53 LOCAL (FRONT ENTERING PANEL) OPERATION DATA Editing the To change the current value of a parameter by edit- Current Value ing, you can use either the cursor control key or the rotary data knob. Using the Cursor Control Key Cursor Control Using the <...
  • Page 54 LOCAL (FRONT ENTERING PANEL) OPERATION DATA Entering a To change the current value of a parameter by en- New Value tering a new value for the parameter, use the data entry keypad and termination keys. As soon as you press one of the keys on the data en- try keypad, the current parameter display clears for entry of a new value.
  • Page 55: Cw Frequency Operation

    LOCAL (FRONT CW FREQUENCY PANEL) OPERATION OPERATION CW FREQUENCY One of the signal generator’s major functions is to produce discrete CW frequencies across the frequency range of the instrument. The OPERATION following paragraphs describe how to place the 681XXC in the CW frequency mode, select a CW frequency and power level for output, and activate the CW ramp.
  • Page 56: Selecting A Cw Frequency

    LOCAL (FRONT CW FREQUENCY PANEL) OPERATION OPERATION Selecting a There are several ways to select a CW frequency for output. You can (1) edit the current frequency, (2) Frequency enter a new frequency, or (3) select one of the 20 pre- set frequency parameters.
  • Page 57 LOCAL (FRONT CW FREQUENCY PANEL) OPERATION OPERATION Frequency List–To go to the Frequency List Menu (below), press Freqs List . This menu lets you tag, edit, or output a frequency from the list. Use the cursor control key to select a frequency from the frequency list.
  • Page 58: Selecting A Power Level

    LOCAL (FRONT CW FREQUENCY PANEL) OPERATION OPERATION Scanning Tagged Frequencies–To go to the Tagged Frequencies Menu (below) from the CW Fre- quency Control menu, press Tag Freq Menu . This menu lets you select the tagged frequencies for output using the Scan Up and Scan Dn keys. Return to the CW Frequency Control Menu display by pressing Previous Menu .
  • Page 59: Cw Ramp

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION CW Ramp When active, the signal generator’s CW ramp pro- vides a repetitive 0V to 10V ramp output to the rear panel HORIZ OUT BNC connector and AUX I/O con- nector. The CW ramp is used to drive a scalar ana- lyzer display.
  • Page 60: Sweep Frequency Operation

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION SWEEP FREQUENCY The signal generator can generate broad (full range) and narrow band sweeps across the frequency range of the instrument. The 681XXC has OPERATION four sweep frequency modes—analog sweep, step sweep, manual sweep, and list sweep.
  • Page 61 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION This menu lets you perform the following: Select a sweep range (edit the sweep start and stop frequency parameters). Go to the sweep ramp menu (set the sweep time and select a sweep trigger). Select an output power level for the sweep.
  • Page 62: Selecting A Sweep Trigger

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting a There are three modes of sweep triggering provided Sweep for analog sweep and step sweep—automatic, exter- Trigger nal, and single. The sweep trigger is selectable from the trigger menu. The following is a description of each mode.
  • Page 63: Step Sweep Mode

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Step Sweep In step sweep frequency mode, the output frequency Mode changes in discrete, synthesized steps between selected start and stop frequencies. Step sweeps can be from a low frequency to a high frequency or from a high frequency to a low frequency.
  • Page 64 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION The step size range is 1 kHz (0.1 Hz with Option 11) to the full frequency range of the signal generator; the number of steps range is 1 to 10,000. If the step size does not divide into the frequency range, the last step is truncated.
  • Page 65 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Open the parameter you wish to change, then edit the current value using the cursor control key or the rotary data knob or enter a new value using the key pad and appropriate termination key. When you have finished setting the open parameter, close it by pressing its menu soft-key or make another menu selection.
  • Page 66: Selecting Manual Sweep Mode

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Manual In manual sweep frequency mode, the output fre- Sweep Mode quency can be manually tuned in phase-locked steps between the selected start and stop frequencies us- ing the rotary data knob. As the knob is turned, the current output frequency is displayed on the data display as Fm.
  • Page 67: 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 the analog sweep, step sweep, and manual sweep fre- quency modes.
  • Page 68 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, F2.
  • Page 69: 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 70: Frequency Markers

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Frequency The signal 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 71 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Use the cursor control key to select a frequency parameter 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 frequency parameter, then edit the current fre-...
  • Page 72: Selecting Alternate Sweep Mode

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting In alternate sweep frequency mode, the signal 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 73 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Now, press Previous Menu to return to the Step Sweep Menu display (or the Analog Sweep Menu display if operating in analog sweep frequency mode). Notice the changes to the Step Sweep Menu display (below).
  • Page 74 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION When you are done selecting the alternate sweep range, press Previous Menu to return to the Alter- nate Sweep Menu display. Selecting an Alternate Sweep Power Level To go to the Alternate Level Menu (below) from the Alternate Sweep menu, press Alt Level .
  • Page 75: List Sweep Mode

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION List Sweep In list sweep frequency mode, the output is a step Mode sweep of up to 2000 phase-locked, non-sequential frequencies. Each frequency can have a different power level setting. The list index (0 thru 1999) identifies each frequency/power level set in the list.
  • Page 76: Selecting List Sweep Mode

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Selecting List To place the 681XXC in list sweep frequency mode, Sweep Mode press the main menu key CW/SWEEP SELECT At the reulting menu display, press List . The List Sweep Menu (below) is displayed. This menu lets you perform the following: Go to the Edit List menus (edit list index fre- quency and power level parameters and insert...
  • Page 77: Editing The List

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Performing List Calculations The PreCalc List soft-key initiates a process that examines every index in the list and performs all the calculations necessary to set the frequency and power levels. The soft-key does not have to be pressed every time the list changes.
  • Page 78 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION List Frequency Edit–to go to the List Frequency Edit Menu (below), press Edit Freq . This menu lets you scroll through the list frequencies and edit se- lected frequencies. The menu displays a total of 20 frequencies. The in- dex range of the displayed frequencies is shown at the top of the list.
  • Page 79 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Press Edit to edit the highlighted power level or en- ter a new power level. Press Page Up to scroll the displayed power levels to the next 10 in the list. Press Page Down to scroll the displayed power levels to the previous 10 in the list.
  • Page 80: Selecting A List Sweep Range

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Copying Data from the CW Menu An easy method of entering frequency and power level information into the current list index is to copy the data from the CW menu. Fisrt, go to the main List Sweep menu and press the List Index soft-key to open the list index parameter.
  • Page 81: Selecting A List Sweep Trigger

    LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION Press Start Index to open the list sweep start index parameter. Press Stop Index to open the list sweep stop index parameter. Press Dwell Time to open the dwell-time-per-step parameter. Open the parameter you wish to change, then edit the current value using the cursor control key or ro- tary data knob or enter a new value using the key pad and appropriate terminator key.
  • Page 82 LOCAL (FRONT SWEEP FREQUENCY PANEL) OPERATION OPERATION To go to the List Sweep Trigger Menu (below) from the Sweep menu, press Trigger . To select a sweep trigger mode, press its menu soft- key. A message showing the trigger mode selected appears on the right side of the frequency title bar.
  • Page 83: Fixed Power Level Operation

    LOCAL (FRONT FIXED POWER PANEL) OPERATION LEVEL OPERATION FIXED POWER LEVEL The signal generator provides leveled output power over a maximum range of up to 33 dB (up to 149 dB with Option 2) for CW and sweep OPERATION frequency operations. Units with Option 15A provide leveled output power over a maximum range of up to 27 dB (up to 141 dB with Op- tion 2).
  • Page 84 LOCAL (FRONT FIXED POWER PANEL) OPERATION LEVEL OPERATION and appropriate terminator key. To close the open NOTE power level parameter, press Edit L1 or make an- When Linear power level units are other menu selection. selected, use the following termina- tor keys for power level data entries: Selecting a Preset Power Level To select one of the preset power levels for output,...
  • Page 85 LOCAL (FRONT FIXED POWER PANEL) OPERATION LEVEL OPERATION Use the cursor control key to select a power level from the level list. The selected power level is high- lighted in reverse video and displayed in full below the level list. Press Tag to mark a selected power level (place an L in front of it).
  • Page 86: Level Offset

    LOCAL (FRONT FIXED POWER PANEL) OPERATION LEVEL OPERATION Level Offset Level offset lets you compensate for a device on the signal 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 681XXC RF output...
  • Page 87 LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION 3-10 POWER LEVEL SWEEP The signal generator provides leveled output power sweeps at CW fre- quencies and in conjunction with frequency sweeps (analog and step). OPERATION Power level sweeps can be from a high level to a low level or vice versa.
  • Page 88: Power Level Sweep Operation

    LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION Setting CW There are two ways to set the size of each step of the Power Sweep CW power sweep—set the step size or set the Step Size and number of steps. The step size range is 0.01 dB Dwell Time (Log) or 0.001 mV (Linear) to the full power range of the instrument;...
  • Page 89: 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 90: 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 pro- cess is identical for all power level sweep modes —CW power sweep, analog sweep frequency/step power, and step sweep frequency/step power.
  • Page 91 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 92: 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 93: Setting Power Level Step Size

    LOCAL (FRONT POWER LEVEL PANEL) OPERATION SWEEP OPERATION Setting Power There are two ways to set the step size of the power Level Step level step that occurs after each frequency sweep Size —set the step size or set the number of steps. The step size range is 0.01 dB (Log) or 0.001 mV (Linear) to the full power range of the ssignal generator;...
  • Page 94 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS 3-11 LEVELING The 681XXC generates leveled output power over a maximum range of up to 33 dB (up to 149 dB with Option 2). Instruments with Option OPERATIONS 15A provide leveled output power over a maximum range of up to 27 dB (up to 141 dB with Option 2).
  • Page 95 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 attenuator, if equipped, from the ALC system and set the power level and attenuation).
  • Page 96 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS Before going to the Leveling Menu from the ALC Mode menu, select whether the external ALC signal is to be connected to the front- or rear-panel EXT ALC IN connector. 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 97: Leveling Operations

    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 display. 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 98: Attenuator Decoupling

    LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS Attenuator In 681XXCs equipped with option 2 step attenua- Decoupling tors, the ALC and attenuator work in conjunction to provide leveled output power down to –140 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 99: 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 100 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 using the cursor control key or rotary data knob or SLOPE enter a new value using the keypad and appropriate termination key.
  • Page 101: User Cal (User Level Flatness Correction)

    Up to five user level flatness correction power-offset tables from 2 to 801 frequency points/table can be created and stored in 681XXC memory for recall. The GPIB power meters supported are the Anritsu Models ML2437A, ML2438A, and ML4803A and the Hewlett-Packard Models 437B, 438A, and 70100A.
  • Page 102 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 681XXC. Step 2 Calibrate the Power Meter with the Power Sensor.
  • Page 103 The new GPIB address will appear on the display. Press Pwr Mtr Select to select the power meter model being used. (Supported power meters are the Anritsu ML2437A, ML2438A, and ML4803A and Hewlett-Packard 437B, 438A, and 70100A.) Press Previous Menu to return to the main Config- ure GPIB Menu display.
  • Page 104 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS Place the signal generator in a fixed power level mode by pressing the main menu key LEVEL/ALC SELECT At the resulting menu display, press Level . The 681XXC is now in fixed (non-swept) power level mode.
  • Page 105 LOCAL (FRONT LEVELING PANEL) OPERATION OPERATIONS range is 2 to 801.) When you have finished setting the open number-of-points parameter, close it by pressing Edit Points or by making another menu selection. Now, press Start Cal to begin automatically taking power level correction information at each frequency point.
  • Page 106 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 681XXC in standby, press and...
  • Page 107: Signal Modulation

    LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION 3-12 SIGNAL MODULATION The signal 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 4-11, 4-12, and 4-13) to follow the menu sequences.
  • Page 108: Frequency Modulation Operating Modes

    LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION Select the input impedance (600W or 50W) of the input connector. Select the input connector (front panel or rear panel AM IN) that is connected to the external signal source. Press On / Off to turn AM on and off. Both the AM status display and AM modulation status area will reflect your selection.
  • Page 109: Providing Frequency Modulation

    LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION In Unlocked Wide mode, frequency modulation is accomplished by applying the modulating signal to the main tuning coil of the YIG-tuned oscillator. Un- locked Wide FM mode allows maximum deviations of ±100 MHz for DC to 100 Hz rates. Providing To provide frequency modulation, first set up the ex- Frequency...
  • Page 110 LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION This menu contains an external FM status window that shows the current menu selections and the measured FM Deviation. (The FM deviation meas- urement function measures the voltage of the exter- nal modulation signal and calculates the peak frequency deviation.) This menu lets you perform the following: Turn FM on/off.
  • Page 111: Square Wave Modulation Operating Modes

    LOCAL (FRONT SIGNAL PANEL) OPERATION MODULATION Square Wave The 681XXC 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 signal generator’s internal square wave genera- tor outputs modulating signals of 400 Hz, 1 kHz, 7.8125 kHz, and 27.8 kHz.
  • Page 112 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 113 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 (below) is displayed. Press Front/Rear to select the front or rear panel IN connector.
  • Page 114: System Configuration

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION 3-13 SYSTEM The system configuration function provides menus that let you set or select instrument configuration items; for example, display intensity, CONFIGURATION polarity of blanking and video marker outputs, RF on or off during re- trace or between steps, frequency scaling, GPIB operating parameters, external interface language, and increment sizes for frequency, power level, and time parameters.
  • Page 115: Configuring The Front Panel

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Configuring Configuring the front panel of the signal 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 116: Configuring The Rear Panel

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Configuring Configuring the rear panel of the signal generator the Rear consists of selecting the polarity of the retrace Panel blanking, 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 117: Configuring The Rf

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Configuring Configuring the RF of the 681XXC involves the fol- the RF lowing: Selecting whether the RF should be on or off during retrace. Selecting whether the RF should be on or off during frequency switching in CW, step sweep, and list sweep modes.
  • Page 118 LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Additional Configure RF Menu When you press More , the Additional Configure RF Menu (below) is displayed. Press Reset State to select RF On or Off at reset. The display will reflect your selection. Frequency Scaling –...
  • Page 119: Configuring The Gpib

    LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Configuring The GPIB configuration menus let you perform the the GPIB following: Set the GPIB address and select the GPIB line terminator for the signal generator. Turn on the source lock mode for operation with a Model 360B Vector Network Analyzer.
  • Page 120 CONFIGURATION Press SS Mode to place the signal generator in a SS MODE source lock mode for operation with a Anritsu Model 360B Vector Network Analyzer. (Refer to paragraph When SS Mode is selected on, this 7-4 for information pertaining to operating the message is displayed (in the fre- 681XXC with a 360B VNA.) Press SS Mode again...
  • Page 121 LOCAL (FRONT SYSTEM PANEL) OPERATION CONFIGURATION Press Native SCPI to select the external interface language to be used for remote operation of the 681XXC. (Language selection is only available on instruments that have Option 19 installed.) Press More to go to the Second Additional Config- ure GPIB menu.
  • Page 122: 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 Ù...
  • Page 123: Saving/Recalling Instrument Setups

    LOCAL (FRONT SAVING/RECALLING PANEL) OPERATION INSTRUMENT SETUPS 3-14 SAVING/RECALLING The 681XXC offers the capability to store up to ten complete front panel setups. The setups are numbered 0 through 9. The following INSTRUMENT SETUPS paragraphs describe how to save and recall front panel setups. Saving Once you have decided that an instrument setup Setups...
  • Page 124: Erasing Stored Setups

    LOCAL (FRONT SAVING/RECALLING PANEL) OPERATION INSTRUMENT SETUPS Erasing The front panel setups are stored in non-volatile Stored Setups memory. A master reset is required to erase the con- tents of the setups and reprogram them with default data. To perform a master reset, proceed as follows: NOTE Step 1 With the 681XXC in standby, press and...
  • Page 125: Secure Operation

    LOCAL (FRONT SECURE PANEL) OPERATION OPERATION 3-15 SECURE OPERATION The 681XXC can be operated in a secure mode of operation. In this secure mode, the display of all frequency, power level, and modulation parameters is disabled during both local (front panel) and remote (GPIB) operations.
  • Page 126: Reference Oscillator Calibration

    LOCAL (FRONT REFERENCE PANEL) OPERATION OSCILLATOR CALIBRATION 3-16 REFERENCE The reference oscillator calibration function lets you calibrate the internal 100 MHz crystal reference oscillator of the 681XXC using an OSCILLATOR CALIBRATION external 10 MHz, 0 to +10 dBm reference signal. NOTE Before beginning calibration, always let the 681XXC warm up for a minimum of...
  • Page 127 LOCAL (FRONT REFERENCE PANEL) OPERATION OSCILLATOR CALIBRATION When Proceed is pressed, the date parameter opens for data entry. Using the key pad, enter the current date (in any desired format). Then, press any teminator key. The Calibration Status Menu display changes to indicate calibration is in progress.
  • Page 128 Chapter 4 Local Operation–Menu Maps Table of Contents INTRODUCTION ....4-3 MENU MAP DESCRIPTION ... . . 4-3...
  • Page 130 Chapter 4 Local Operation–Menu Maps INTRODUCTION This chapter provides menu maps that support the 681XXC 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 132: Sample Menu Map

    LOCAL OPERATION SAMPLE –MENU MAPS MENU MAP Figure 4-1. Sample Menu Map (Annotated) 681XXC OM...
  • Page 133: Cw Frequency Mode Menu Map

    LOCAL OPERATION –MENU MAPS FREQUENCY MODE NOTES Refer to Chapter 7, paragraph 7-2 for Master-Slave operating in- structions. Refer to Chapter 3, paragraph 3-7 for CW Frequency Mode operating instructions. Figure 4-2. CW Frequency Mode Menu Map 681XXC OM...
  • Page 134: Analog Sweep Frequency Mode Menu Map

    LOCAL OPERATION ANALOG SWEEP –MENU MAPS FREQUENCY MODE NOTE Refer to Chapter 3, paragraph 3-8 for Analog Sweep Frequency Mode operating instructions. Figure 4-3. Analog Sweep Frequency Mode Menu Map 681XXC OM...
  • Page 135: Step Sweep Frequency Mode Menu Map

    LOCAL OPERATION STEP SWEEP –MENU MAPS FREQUENCY MODE NOTE Refer to Chapter 3, paragraph 3-8 for Step Sweep Frequency Mode operating instructions. Figure 4-4. Step Sweep Frequency Mode Menu Map 681XXC OM...
  • Page 136: Manual Sweep Frequency Mode Menu Map

    LOCAL OPERATION MANUAL SWEEP –MENU MAPS FREQUENCY MODE NOTE Refer to Chapter 3, paragraph 3-8 for Manual Sweep Frequency Mode operating instructions. Figure 4-5. Manual Sweep Frequency Mode Menu Map 681XXC OM...
  • Page 137: List Sweep Frequency Mode Menu Map

    LOCAL OPERATION LIST SWEEP –MENU MAPS FREQUENCY MODE NOTE Refer to Chapter 3, paragraph 3-8 for List Sweep Frequency Mode operating instructions. Figure 4-6. List Sweep Frequency Mode Menu Map 4-10 681XXC OM...
  • Page 138 LOCAL OPERATION FIXED POWER –MENU MAPS LEVEL MODE NOTE Refer to Chapter 3, paragraph 3-9 for Fixed Power Level Mode operating in- structions. Figure 4-7. Fixed Power Level Mode Menu 681XXC OM 4-11...
  • Page 139: Cw Power Sweep Mode Menu Map

    LOCAL OPERATION CW POWER –MENU MAPS SWEEP MODE NOTE Refer to Chapter 3, paragraph 3-10 for CW Power Sweep Mode operating instructions. Figure 4-8. CW Power Sweep Mode Menu 4-12 681XXC OM...
  • Page 140: Sweep Frequency/Step Power Mode Menu Map

    LOCAL OPERATION SWEEP FREQUENCY/ –MENU MAPS STEP POWER MODE NOTE Refer to Chapter 3, paragraph 3-10 for Sweep Frequency/Step Power Mode operating instructions. Figure 4-9. Sweep Frequency/Step Power Mode Menu Map 681XXC OM 4-13...
  • Page 141: 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 External ALC Input Selects External ALC SELECT Power Meter Input LEVEL CONTROL Selects Rear Panel Selects ALC Off External ALC Input MODULATION...
  • Page 142: Amplitude Modulation Mode Menu Map

    LOCAL OPERATION AMPLITUDE –MENU MAPS MODULATION MODE CW/SWEEP AM On /Off SELECT Log AM (0-25dB/V) or FREQUENCY CONTROL Linear AM (0-100%/V) LEVEL/ALC SELECT Edit AM Sensitivity LEVEL or 50 CONTROL Input Impedance MODULATION Front Panel Input or Rear Panel Input SYSTEM CW/SWEEP SELECT...
  • Page 143: Frequency Modulation Mode Menu Map

    LOCAL OPERATION FREQUENCY –MENU MAPS MODULATION MODE CW/SWEEP FM On /Off SELECT FREQUENCY Edit FM Sensitivity CONTROL or 50 LEVEL/ALC SELECT Input Impedance LEVEL Front Panel Input or CONTROL Rear Panel Input Select Locked FM Mode MODULATION Selects Unlocked / Narrow SYSTEM FM Mode Selects Unlocked / Wide...
  • Page 144 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 145: System Configuration Menu Map

    LOCAL OPERATION SYSTEM –MENU MAPS CONFIGURATION C W / S W E E P B r i g h t e n s T h e D i s p l a y S E L E C T . R E Q U E N C Y D i m s T h e D i s p l a y C O N T R O L L E V E L / A L C...
  • Page 146 Chapter 5 Operation Verification Table of Contents INTRODUCTION ....5-3 TEST EQUIPMENT....5-3 TEST RECORDS .
  • Page 148: Introduction

    External Mixer: Option 91 (26.5 to 40 GHz) Option 92 (40 to 60 GHz) Option 93 (60 to 90 GHz) Power Meter, Range: –30 to +20 dBm Anritsu Model ML2437A or ML2438A, with (1mW to 100 mW) with Power Power Sensors: Sensors MA2474A (0.01 to 40 GHz)
  • Page 149: Initial 681Xxc Checkout

    OPERATION INITIAL 681XXC VERIFICATION CHECKOUT INITIAL 681XXC Before starting the operation verification tests in this chapter, perform an initial checkout of the 681XXC to be tested. This initial checkout CHECKOUT consists of applying power to the signal generator, verifying that it passes self-test, and resetting it to the factory default parameters.
  • Page 150: Cw Frequency Accuracy Test

    OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST CW FREQUENCY The following test verifies that the CW frequency output of the signal generator is within accuracy specifications. Table 5-2, beginning on ACCURACY TEST page 5-7, contains test records that you can copy and use to record test results for this test.
  • Page 151: 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 681XXC as follows: a. Reset the instrument by pressing SYSTEM , then RESET .
  • Page 152 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Table 5-2A. CW Frequency Accuracy Test Record (for Standard Models) (1 of 3) Model 681 _ _ C Serial No. ____________________ Date ___________ 68117C 68137C / 68147C 1.000 000 000* _____________________ 2.000 000 000* _____________________ 2.000 000 000 _____________________...
  • Page 153 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Table 5-2A. CW Frequency Accuracy Test Record (for Standard Models) (2 of 3) Model 681 _ _ C Serial No. ____________________ Date ___________ 68167C 68177C 2.000 000 000* _____________________ 2.000 000 000* _____________________ 5.000 000 000 _____________________ 6.000 000 000 _____________________...
  • Page 154 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Table 5-2A. CW Frequency Accuracy Test Record (for Standard Models) (3 of 3) Model 681 _ _ C Serial No. ____________________ Date ___________ 68187C 68197C 2.000 000 000* _____________________ 2.000 000 000* _____________________ 6.000 000 000 _____________________ 6.000 000 000 _____________________...
  • Page 155 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Table 5-2B. CW Frequency Accuracy Test Record (for Models with Option 11) (1 of 3) Model 681 _ _ C Serial No. ____________________ Date ___________ * Specification for all frequencies listed above is ±100 Hz. All frequencies are in GHz. 68117C 68137C / 68147C 1.000 000 000 0*...
  • Page 156 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Figure 5-2B. CW Frequency Accuracy Test Record (for Models with Option 11) (2 of 3) Model 681 _ _ C Serial No. ____________________ Date ___________ * Specification for all frequencies listed above is ±10 Hz. All frequencies are in GHz. 68167C 68177C 2.000 000 000 0*...
  • Page 157 OPERATION CW FREQUENCY VERIFICATION ACCURACY TEST Table 5-2B. CW Frequency Accuracy Test Record (for Models with Option 11) (3 of 3) Model 681 _ _ C Serial No. ____________________ Date ___________ * Specification for all frequencies listed above is ±10 Hz. All frequencies are in GHz. 68187C 68197C 2,000 000 000 0*...
  • Page 158: Power Level Accuracy And Flatness Tests

    OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS POWER LEVEL These tests verify that the power level accuracy and flatness of the 681XXC meet specifications. Table 5-3, beginning on page 5-19, con- ACCURACY AND FLATNESS TESTS tains test records that you can copy and use to record test results for these tests.
  • Page 159: Power Level Accuracy Test Procedure

    OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Power Level Power level accuracy is checked by stepping the Accuracy Test power down in 1 dB increments from its maximum Procedure rated power level. Step 1 Set up the 681XXC as follows: a.
  • Page 160: 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 161 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 (below). i.
  • Page 162 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Step 3 Set up the 681XXC as follows for an ana- log sweep power level flatness test: a. Reset the instrument by pressing SYSTEM , then Reset . The CW Menu is displayed. b.
  • Page 163 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 164 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (1 of 27) Model 68117C Serial No. ____________________ Date ___________ Model 68117C (without Option 2 Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz) Set Power...
  • Page 165 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (2 of 27) Model 68117C Serial No. ____________________ Date ___________ Model 68117C (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz) Set Power...
  • Page 166 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (3 of 27) Model 68117C Serial No. ____________________ Date ___________ Model 68117C (with Option 2E Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz) Set Power...
  • Page 167 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (4 of 27) Model 68117C w/Option 15A Serial No. ____________________ Date ___________ Model 68117C with Option 15A High Power (without Option 2 Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz)
  • Page 168 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (5 of 27) Model 68117C w/Option 15A Serial No. ____________________ Date ___________ Model 68117C with Option 15A High Power (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz)
  • Page 169 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (6 of 27) Model 68117C w/Option 15A Serial No. ____________________ Date ___________ Model 68117C with Option 15A High Power (with Option 2E Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz)
  • Page 170 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (7 of 27) Model 68137C Serial No. ____________________ Date ___________ Model 68137C (without Option 2 Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power Measured Power +13 dBm...
  • Page 171 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (8 of 27) Model 68137C Serial No. ____________________ Date ___________ Model 68137C (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power Measured Power +11 dBm...
  • Page 172 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (9 of 27) Model 68137C Serial No. ____________________ Date ___________ Model 68137C (with Option 2F Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power Measured Power + 3 dBm...
  • Page 173 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (10 of 27) Model 68137C w/Option 15A Serial No. ____________________ Date ___________ Model 68137C with Option 15A High Power (without Option 2 Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power...
  • Page 174 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (11 of 27) Model 68137C w/Option 15A Serial No. ____________________ Date ___________ Model 68137C with Option 15A High Power (with Option 2A Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power...
  • Page 175 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (12 of 27) Model 68137C w/Option 15A Serial No. ____________________ Date ___________ Model 68137C with Option 15A High Power (with Option 2F Step Attenuator) Power Level Accuracy * (CW Frequency = 5.0 GHz) Set Power...
  • Page 176 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (13 of 27) Model 68147C Serial No. ____________________ Date ___________ Model 68147C (without Option 2 Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz) Set Power...
  • Page 177 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (14 of 27) Model 68147C Serial No. ____________________ Date ___________ Model 68147C (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz) Set Power...
  • Page 178 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (15 of 27) Model 68147C Serial No. ____________________ Date ___________ Model 68147C (with Option 2F Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz) (CW Frequency = 5.0 GHz) Set Power...
  • Page 179 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (16 of 27) Model 68147C w/Option 15A Serial No. ____________________ Date ___________ Model 68147C with Option 15A High Power (without Option 2 Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz)
  • Page 180 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (17 of 27) Model 68147C w/Option 15A Serial No. ____________________ Date ___________ Model 68147C with Option 15A High Power (with Option 2A Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz)
  • Page 181 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (18 of 27) Model 68147C w/Option 15A Serial No. ____________________ Date ___________ Model 68147C with Option 15A High Power (with Option 2F Step Attenuator) Power Level Accuracy * Power Level Accuracy * (CW Frequency = 1.0 GHz)
  • Page 182 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (19 of 27) Model 68167C Serial No. ____________________ Date ___________ Model 68167C (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 183 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (20 of 27) Model 68167C Serial No. ____________________ Date ___________ Model 68167C (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 184 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (21 of 27) Model 68167C w/Option 15A Serial No. ____________________ Date ___________ Model 68167C with Option 15A High Power (without Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy *...
  • Page 185 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (22 of 27) Model 68167C w/Option 15A Serial No. ____________________ Date ___________ Model 68167C with Option 15A High Power (with Option 2B Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy *...
  • Page 186 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (23 of 27) Model 68177C Serial No. ____________________ Date ___________ Model 68177C (without Option 2C Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz) (CW Frequency = 25.0 GHz)
  • Page 187 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (24 of 27) Model 68177C Serial No. ____________________ Date ___________ Model 68177C (with Option 2C Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz) (CW Frequency = 25.0 GHz)
  • Page 188 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (25 of 27) Model 68187C Serial No. ____________________ Date ___________ Model 68187C (without Option 2D Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz) (CW Frequency = 25.0 GHz)
  • Page 189 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (26 of 27) Model 68187C Serial No. ____________________ Date ___________ Model 68187C (with Option 2D Step Attenuator) Power Level Accuracy * Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz) (CW Frequency = 25.0 GHz)
  • Page 190 OPERATION POWER LEVEL ACCURACY VERIFICATION AND FLATNESS TESTS Table 5-3. Power Level Accuracy and Flatness Test Record (27 of 27) Model 68197C Serial No. ____________________ Date ___________ Model 68197C Power Level Accuracy * Power Level Accuracy * Power Level Accuracy * (CW Frequency = 5.0 GHz) (CW Frequency = 25.0 GHz) (CW Frequency = 50.0 GHz)
  • Page 191 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 193: Introduction

    Chapter 6 Operator Maintenance INTRODUCTION This chapter provides the information necessary for operator mainte- nance of the signal generator. Operator maintenance is limited to troubleshooting and repairs that can be made without removing the instrument covers. ERROR AND During normal operation, the 681XXC generates error messages to in- WARNING/STATUS dicate internal malfunctions, abnormal signal generator operations, or invalid signal inputs or data entries.
  • Page 194 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES WARNING Self-test error messages normally indicate the failure of an internal component or assembly of the signal generator. There are no operator serviceable components inside. Refer servicing of the instrument to qualified service technicians. To prevent the risk of electrical shock or damage to precision components, do not remove the equipment covers.
  • Page 195 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Table 6-1. Self-Test Error Messages (2 of 4) Error Message Description/Remarks Error 111 Indicates one or more of the oscillators within the fine loop is not phase-locked. The Fine Loop Osc Failed 681XXC is still operable but the accuracy and stability of frequency outputs are greatly reduced.
  • Page 196 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Table 6-1. Self-Test Error Messages (3 of 4) Error Message Description/Remarks Error 125 Indicates a failure of the 8.4 to 20 GHz YIG-tuned oscillator. Do Not Attempt to 8.4 – 20 GHz Unlocked and Operate! Refer the instrument to a qualified service techician.
  • Page 197 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Table 6-1. Self-Test Error Messages (4 of 4) Error Message Description/Remarks Error 138 Indicates a failure of the switched doubler module (SDM) or SDM bias regulator cir- SDM Unit or Driver Failed cuitry on the A14 PCB. The 681XXC is still operable but it will not produce an RF output in the 20 - 40 GHz frequency range.
  • Page 198 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Normal When an abnormal condition is detected during op- Operation eration, the 681XXC displays an error message to Error and indicate 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 199 OPERATOR ERROR AND WARNING/ MAINTENANCE STATUS MESSAGES Table 6-3. Possible Warning/Status Messages during Normal Operation Warning/Status Description Message OVN COLD This warning message indicates that the 100 MHz Crystal oven (or the 10 MHz Crystal oven if Option 16 is installed) has not reached operating temperature.
  • Page 200: Troubleshooting

    OPERATOR MAINTENANCE TROUBLESHOOTING TROUBLESHOOTING Table 6-4 provides procedures for troubleshooting common malfunc- tions encountered during operation of the signal generator. Included are procedures for troubleshooting faults that do not produce error messages, such as, failure to power up and unexpected shutdown. Table 6-4.
  • Page 201 OPERATOR MAINTENANCE TROUBLESHOOTING Table 6-4. Troubleshooting (2 of 3) Signal Generator Quits During Operation (OPERATE light remains on) Trouble Description: The signal generator operates for some time, then shuts down (OPERATE light remains on). After a short period, the signal generator resumes normal operation. This is an indication that the 681XXC has reached an excessive operating temperature.
  • Page 202 OPERATOR MAINTENANCE TROUBLESHOOTING Table 6-4. Troubleshooting (3 of 3) is Displayed UNLEVELED 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 50W load.
  • Page 203: Routine Maintenance

    OPERATOR ROUTINE MAINTENANCE MAINTENANCE ROUTINE MAINTENANCE Routine maintenance that can be performed by the operator consists of cleaning the fan filter, cleaning the data display, and replacing a defective line fuse. Cleaning the The 681XXC must always receive adequate ventila- Fan Filter tion.
  • Page 204: Replacing The Line Fuse

    OPERATOR ROUTINE MAINTENANCE MAINTENANCE free cloth. Do not use abrasive cleaners, tissues, or paper towels which can scratch the plastic surface. Replacing the The value of the line fuse used in the 681XXC is de- Line Fuse termined by the line voltage selection—a 5A type T line fuse for 110 Vac line voltage;...
  • Page 205 OPERATOR ROUTINE MAINTENANCE MAINTENANCE Step 3 Replace the fuse in the fuse holder. Step 4 Install the fuse holder in the rear panel. Using the screwdriver, rotate the fuse cap clockwise to secure the fuse holder in place. Step 5 Reconnect the signal generator to the power source.
  • Page 206 Chapter 7 Use With Other Instruments Table of Contents INTRODUCTION ....7-3 MASTER-SLAVE OPERATION ... 7-4 Connecting the Instruments .
  • Page 208: Introduction

    56100A Scalar Network Analyzer so that it can be used as a signal source for the analyzer. Instructions for connecting the 681XXC to a Anritsu Model 360B Vector Network Analyzer and configuring the signal generator so that it can be used as a signal source for the analyzer.
  • Page 209: Master-Slave Operation

    “MASTER” to the rear panel AUX together for Master-Slave opera- I/O connector on the Master instrument. tions, always use a Anritsu Connect the AUX I/O cable labeled Master-Slave interface cable set, “SLAVE” to the rear panel AUX I/O con- Part No.
  • Page 210: Initiating Master-Slave Operation

    USE WITH MASTER-SLAVE OTHER INSTRUMENTS OPERATION Step 4 Connect the Master instrument RF OUT- PUT and the Slave instrument RF OUT- PUT to the appropriate connections on the DUT. Initiating The following paragraphs describe how to set up Master-Slave both instruments to perform master-slave opera- tions.
  • Page 211 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 instrument. Use the cursor control key to select a frequency pa- rameter from the list, then press Edit to edit its value.
  • Page 212: 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 display. Master-Slave During master-slave operation, the Slave unit is in Operation...
  • Page 213 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 instrument in the VNA mode. Press VNA Offset to open the slave frequency offset parameter.
  • Page 214: 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 instrument to Operation local (front panel) control. On the Master instrument, select CW mode. At the CW Menu, press Master Slave to go to the Master Slave Menu display.
  • Page 215: Use With A 56100A Scalar Network Analyzer

    USE WITH A 56100A SCALAR OTHER INSTRUMENTS NETWORK ANALYZER USE WITH A 56100A The 681XXC is directly compatible with the Anritsu Model 56100A Scalar Network Analyzer (SNA). The following paragraphs provide SCALAR NETWORK ANALYZER instructions for connecting the signal generator to the 56100A SNA so that is can be used as a signal source for the analyzer.
  • Page 216: Use With A 360B Vector Network Analyzer

    USE WITH A 360B VECTOR OTHER INSTRUMENTS NETWORK ANALYZER USE WITH A 360B The 681XXC signal generator is compatible with the Anritsu Model 360B Vector Network Analyzer (VNA). The following paragraphs pro- VECTOR NETWORK ANALYZER vide instructions for connecting the 681XXC to the 360B VNA and con- figuring the signal generator so that it can operate as a signal source for the analyzer.
  • Page 217: Modes Of Operation

    USE WITH USE WITH A 360B VECTOR OTHER INSTRUMENTS NETWORK ANALYZER If the 681XXC contains an Option 16 high-stability time base, connect the coax- ial cable between the 681XXC 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 681XXC rear panel...
  • Page 218 USE WITH USE WITH A 360B VECTOR OTHER INSTRUMENTS NETWORK ANALYZER At the System Configuration menu, press GPIB . The Configure GPIB Menu (below) is displayed. Verify that the GPIB address and terminator shown on the display match the System Bus source address and data terminator that are set on the 360B VNA.
  • Page 219: 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 681XXC to local con- trol and then turn off the SS Mode. To return the 681XXC to local control, turn off the 360B VNA.
  • Page 220 USE WITH USE WITH A 360B VECTOR OTHER INSTRUMENTS NETWORK ANALYZER If the address of the 681XXC 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 221: Use With A Hp8757D Scalar Network Analyzer

    USE WITH USE WITH A HP8757D OTHER INSTRUMENTS SCALAR NETWORK ANALYZER USE WITH A HP8757D The 681XXC signal generator is compatible with the Hewlett Packard 8757D Scalar Network Analyzer (SNA). The following paragraphs pro- SCALAR NETWORK ANALYZER vide instructions for connecting the 681XXC to the HP8757D SNA and setting up the signal generator so that it can operate as a signal source for the analyzer.
  • Page 222: Setting Up The 681Xxc

    OTHER INSTRUMENTS SCALAR NETWORK ANALYZER Step 3 Connect the special AUX I/O interface cable (Anritsu Part No. 806-90) to the 681XXC rear panel AUX I/O connector. Connect the cable end having BNC con- nectors as follows: a. Connect the cable end labeled “SEQ SYNC”...
  • Page 223 USE WITH USE WITH A HP8757D OTHER INSTRUMENTS SCALAR NETWORK ANALYZER Press GPIB Address to change the address of the 681XXC on the bus. Enter 19 using the cursor con- trol key or the data entry keypad and the termina- tor key ADRS The new GPIB address (19) will appear on the dis-...
  • Page 224: Initiating Hp8757D Sna Operation

    USE WITH USE WITH A HP8757D OTHER INSTRUMENTS SCALAR NETWORK ANALYZER Initiating Turn ON the HP8757D to initiate scalar network HP8757D analyzer operation. (Refer to the Hewlett Packard Model 8757D Scalar Network Analyzer Operation Operation Manual for operating instructions. 681XXC OM 7-19/7-20...
  • Page 225 Appendix A Rear Panel Connectors INTRODUCTION This appendix provides descriptions for the rear panel connectors on a typical Series 681XXC Synthesized Signal Generator. REAR PANEL Figure A-1 provides a illustration of the rear panel and describes the CONNECTORS rear panel connectors. CONNECTOR PINOUT Figures A-2 and A-3 provide pinout diagrams and descriptions for the DIAGRAMS...
  • Page 226 REAR PANEL CONNECTORS Figure A-1. Rear Panel, Series 681XXC Synthesized Signal Generator (1 of 2) 681XXC OM...
  • Page 227 CONNECTORS AUX I/O: 25-pin connector that provides for single cable interface with another 68XXXB/C (master-slave operation) and with other Anritsu instruments such as the Anritsu 56100A Scalar Network Analyzer. A pinout diagram for this connector is shown in Figure A-2.
  • Page 228 REAR PANEL CONNECTOR CONNECTORS PINOUT DIAGRAMS AUX I/O SIGNAL NAME SIGNAL DESCRIPTION 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 HORIZ OUTPUT proportional to frequency between 0V at low end and +10V at the high end of range.
  • Page 229 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 68117C, 68137C, and 68147C; 0.5 V/GHz for Model 68167C; 0.25V/GHz for Models 68177C, 68187C, and 68197C). End-of-Sweep Input: Accepts a TTL high-level signal to tell the signal generator EOS INPUT to begin the end of sweep dwell.
  • Page 230 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 Data Input/Output: Bits are HIGH when the data is logical 0 and LOW when the DIO 1 thru DIO 4 data is logical 1.
  • Page 231 Appendix B Performance Specifications MODEL SUMMARY ANALOG SWEEP MODE Sweep Width: Independently selected from 1 MHz to full Model Frequency Range range continuous sweep. Accuracy: The lesser of: 68117C 0.01 to 8.4 GHz ±30 MHz or (±2 MHz + 0.25% of sweep width) for sweep speeds of £50 MHz/ms.
  • Page 232 SPECIFICATIONS 360B VNA SOURCE LOCK MODE SPECTRAL PURITY Under control of the Anritsu 360B Vector Network Ana- All specifications apply to the phase-locked CW and Step lyzer, the synthesized signal generator is phase-locked at a Sweep modes at the lesser of +10 dBm output or maxi- typical <8.5 ms/step sweep speed.
  • Page 233 PERFORMANCE SPECIFICATIONS SINGLE-SIDEBAND PHASE NOISE (dBc/Hz) Offset From Carrier Frequency Range 100 Hz 1 kHz 10 kHz 100 kHz 0.1 Hz to <10 MHz –90 –120 –130 –130 (w/Option 22) ³10 MHz to £2.0 GHz –77 –88 –86 –100 >2.0 GHz to £6.0 GHz –78 –88 –86...
  • Page 234 PERFORMANCE SPECIFICATIONS RF OUTPUT Power level specifications apply at 25° ±10°C. MAXIMUM LEVELED OUTPUT POWER Frequency Output Output Power with Output Power with Model Range Power Step Attenuator Electronic Step Number (GHz) (dBm) (dBm) Attenuator (dBm) w/Option 22 0.1 Hz to 10 MHz +13.0 +11.0 +9.0...
  • Page 235 PERFORMANCE SPECIFICATIONS LEVELED OUTPUT POWER RANGE Analog Sweep Mode (typical) Standard Units Frequency Attenuation Without an Attenuator: Maximum leveled power to (GHz) Below –15 dBm (–20 dBm typical). Max Power 0.01-0.05 0.05-20 20-40 40-65 With an Attenuator: Maximum leveled power to Accuracy –120 dBm.
  • Page 236 PERFORMANCE SPECIFICATIONS User Level Flatness Correction: FREQUENCY MODULATION Number of points: 2 to 801 points per table External FM Input: Front or rear panel BNC, 50W or 600W input impedance. All options selectable from modulation Number of tables: 5 available menu.
  • Page 237 Keypad entries are terminated by pressing the appropri- Emulations: The instrument responds to the published ate unit key (GHz/Sec/dBm, MHz/ms/dB, kHz/ms/STEPS, GPIB commands and responses of the Anritsu Models or Hz/ns/ADRS). Edits are terminated by exiting the edit 6600, 6700, and 6XX00-series signal sources. When emu- menu.
  • Page 238 PERFORMANCE SPECIFICATIONS Warm Up Time: INPUTS and OUTPUTS From Standby: 30 minutes. From Cold Start (0°C): 120 hours to achieve specified Input/Output Connectors frequency stabiltiy with aging. Instruments disconnected from ac line power for more Nomenclature Type Location than 72 hours require 30 days to return to specified fre- AM IN Front &...
  • Page 239 Model 56100A Scalar Network Analyzer standard 19-inch equipment rack. and other Anritsu instruments. For a pinout diagram and de- Option 2A, 110 dB Step Attenuator: Adds a 10 dB/step scriptions, see Appendix A, Figure A-2.
  • Page 240 Subject Index Number Menu Display Format, 3-9 Menu Keys, 3-10 681XXC Data Entry Area Front Panel Layout, 3-6 Description, 3-12 General Description, 1-3 Default Parameters, 3-16 Manual, Electronic, 1-5 Manuals, Related, 1-5 Models, List of, 1-4 Options, List of, 1-6 Entering Data Performance Specifications, B-1 Setting Increment Sizes, 3-88...
  • Page 241 SUBJECT INDEX Square Wave Modulation Mode, 3-73 Leveling Operations ALC Power Slope, 3-65 Attenuator Decoupling, 3-64 Operating Environment, 2-6 External Leveling, 3-61 Operational Verification Tests, 5-3 Fixed Gain, 3-63 Operator Maintenance Internal Leveling, 3-61 Error and Warning/Status Messages, 6-3 Menu Map, 4-14 Routine Maintenance, 6-13 Selecting a Leveling Mode, 3-60 Troubleshooting, 6-10...
  • Page 242 SUBJECT INDEX Operating Modes, 3-77 Setting Increment Sizes, 3-88 Providing Square Wave Modulation, 3-77 SS Mode Operation, 7-12 Start Up, 3-14 Test Equipment, 1-8, 5-3 Start-Up Display, 3-14 Testing, Operational Verification Step Sweep Frequency Mode CW Frequency Accuracy, 5-5 Menu Map, 4-8 Initial 681XXC Checkout, 5-4 Sweep Frequency/Step Power Mode Power Level Accuracy and Flatness, 5-13...

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