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6-4

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 Line Fuse

The value of the line fuse used in the 681XXB is de-
termined by the line voltage selection—a 5A line
fuse for 110 Vac line voltage; a 2.5A line fuse for
220 Vac line voltage. These line fuse values are
printed on the rear panel next to the fuse holder.

Step 1

Disconnect the 681XXB from the power
source. 

Step 2

Using a small flat-blade screwdriver, turn
the fuse cap counter-clockwise and re-
move the fuse holder.

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 sweep generator to the
power source.

OPERATOR

ROUTINE

MAINTENANCE

MAINTENANCE

Fuse

Fuse Holder

Figure 6-1.

Replacing the Line Fuse

681XXB OM

6-13

Содержание 681 B Series

Страница 1: ...490 JARVIS DRIVE MORGAN HILL CA 95037 2809 SERIES 681XXB SYNTHESIZED SWEEP GENERATOR OPERATION MANUAL P N 10370 10258 REVISION B PRINTED FEBRUARY 1995 COPYRIGHT 1993 WILTRON CO...

Страница 2: ...oes not apply to defects resulting from improper or inadequate mainte nance by the Buyer unauthorized modification or misuse or operation outside of the environmental specifications of the product No...

Страница 3: ...Products Synthesized CW Sweep Signal Generators Models 680XXB 681XXB 682XXB 683XXB Standards 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...

Страница 4: ...following the tab Chapter 4 Local Operation Menu Maps Chapter 4 provides menu maps that support the local front panel operating instructions found in Chapter 3 It includes menu maps for all of the fre...

Страница 5: ...escriptions for the AUX I O and IEEE 488 GPIB connectors Appendix B Performance Specifications Appendix B lists the performance specifications for the Series 681XXB Synthesized Sweep Generator Supplem...

Страница 6: ...DESCRIPTION 1 3 1 4 IDENTIFICATION NUMBER 1 5 1 5 RELATED MANUALS 1 5 GPIB Programming Manual 1 5 SCPI Programming Manual 1 5 Maintenance Manual 1 5 1 6 OPTIONS 1 6 1 7 PERFORMANCE SPECIFICATIONS 1 6...

Страница 7: ...Figure 1 1 Series 681XXB Synthesized Sweep Generator...

Страница 8: ...anuals options and performance specifications A listing of recommended test equip ment is also provided 1 3 DESCRIPTION The Series 681XXB Synthesized Sweep Generators are microprocessor based synthesi...

Страница 9: ...dBm 3 dBm 68169B 0 01 2 0 GHz 2 0 20 0 GHz 20 0 40 0 GHz 13 dBm 9 dBm 6 dBm 11 dBm 7 dBm 3 dBm With Option 15 High Power Installed 68137B 2 0 20 0 GHz 17 dBm 15 dBm 68147B 0 01 2 0 GHz 2 0 20 0 GHz 1...

Страница 10: ...ta transfer and control functions a com plete listing and description of all 681XXB GPIB Product Specific commands and several program ming examples The WILTRON part number for the GPIB Programming Ma...

Страница 11: ...onnector on the front panel 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 WIL...

Страница 12: ...GHz Input Z 50 Resolution 1 Hz Other External Time Base Input EIP Microwave Inc Model 578A with External Mixer Option 91 26 5 to 40 GHz Power Meter with Power Sensor Range 30 to 20 dBm 1 W to 100 mW...

Страница 13: ...5 Warmup Time 2 6 Operating Environment 2 6 2 4 GPIB SETUP AND INTERCONNECTION 2 7 Interface Connector 2 7 Cable Length Restrictions 2 7 GPIB Interconnection 2 7 Setting the GPIB Address 2 7 Selecting...

Страница 14: ...ntainer or cushioning material is damaged retain until the contents of the ship ment have been checked against the packing list and the sweep gener ator has been checked for mechanical and electrical...

Страница 15: ...0 Vac the 681XXB accepts 180 to 264 Vac line voltage If the selector setting is incor rect for the line voltage available change it to the correct setting Whenever the selector setting is changed the...

Страница 16: ...ng temperature On the front panel press LINE to switch the 681XXB from OPERATE green LED on to STANDBY orange LED on NOTE During standby operation the fan runs continuously PREPARATION INSTALLATION FO...

Страница 17: ...o assure stable opera tion Operating Environment The 681XXB can be operated within the following en vironmental limits Temperature 0 C to 55 C 32 F to 131 F Humidity 5 to 95 relative at 40 C Altitude...

Страница 18: ...e cable length between all instruments is too long the data and control lines cannot be driven properly and the system may fail to perform Cable length restrictions are as follows No more than 15 inst...

Страница 19: ...is displayed Press the menu soft key GPIB Address to change the current GPIB address of the sweep generator Enter a new address using the cursor control key or the data entry keypad and the terminator...

Страница 20: ...rators can be remotely operated via the GPIB using one of two external interface languages Native or SCPI Op tion 19 The Native interface language uses a set of 681XXB GPIB Product Specific commands t...

Страница 21: ...se two options is possible instructions for packaging and shipment are given below Use a Suitable Container Obtain a corrugated cardboard carton with a 275 pound test strength This carton should have...

Страница 22: ...Zone de Courtaboeuf 91951 Les Ulis Cedex Telephone 016 44 66 546 FAX 016 44 61 065 GERMANY ANRITSU WILTRON GmbH Rudolf Diesel Strabe 17 8031 Gilching Telephone 08 10 58 055 FAX 08 10 51 700 INDIA MEER...

Страница 23: ...8 3 4 DATA ENTRY AREA 3 10 3 5 INSTRUMENT START UP 3 12 Powering Up the 681XXB 3 12 Start Up Display 3 12 Standby Operation 3 12 Self Testing the 681XXB 3 13 Resetting to Default Parameters 3 13 3 6 E...

Страница 24: ...39 3 10 POWER LEVEL SWEEP OPERATION 3 40 Selecting CW Power Sweep Mode 3 40 Setting CW Power Sweep Step Size and Dwell Time 3 41 Selecting a CW Power Sweep Trigger 3 42 Selecting a Power Level Sweep R...

Страница 25: ...l 3 68 Configuring the Rear Panel 3 69 Configuring the RF 3 70 Configuring the GPIB 3 71 Setting Increment Sizes 3 73 3 14 SAVING RECALLING INSTRUMENT SETUPS 3 74 Saving Setups 3 74 Recalling Setups 3...

Страница 26: ...panel data display area and data entry area that identify and describe all front panel con trols inputs and outputs An annotated diagram of the menu display format showing where the current frequency...

Страница 27: ...ur rent status of the 681XXB in a menu display for mat This information includes the operating mode of the instrument the value of the active frequency and power level parameters and the modulation st...

Страница 28: ...ors The front panel has both input and output connec tors Modulation Connectors The modulation connectors provide for applying ex ternal AM FM or Square Wave modulation to the RF output signal Externa...

Страница 29: ...the menu display and identifies the dis play elements It also shows the placement of the menu keys in rela tion to the display The paragraphs that follow provide descriptions of the menu display elem...

Страница 30: ...le Bars Each type of signal modulation AM FM Square Wave has a separate title bar on the display Parameter Areas The parameter areas show the frequency power level and modulation information for the c...

Страница 31: ...of each main menu follows CW SWEEP SELECT This menu lets you select between CW Analog Step and Manual Sweep frequency modes FREQUENCY CONTROL In CW frequency mode this menu lets you select the CW fre...

Страница 32: ...The cursor is displayed on all sub menus of the current menu until a differ ent main menu key is pressed When the SYSTEM key is pressed the System menu is displayed The System menu and its sub menus d...

Страница 33: ...used to increase or de crease the value of the parameter The unit size of the increase or decrease that occurs each time the or pad is pressed is determined by the cursor posi tion In addition when ed...

Страница 34: ...he param eter s value increases or decreases by the set amount KEYPAD The numeric keypad provides for entering fre quency power level time and number of steps pa rameters and GPIB address values The k...

Страница 35: ...ayed until the sweep generator has loaded all programs Upon completion of power up the 681XXB returns to the exact configuration it was in when last turned off Standby Operation Whenever the sweep gen...

Страница 36: ...on To perform a self test from any menu press SYSTEM Then when the System Menu shown below is displayed press Selftest Resetting to Default Pa rameters You can reset the 681XXB to the factory selected...

Страница 37: ...40 0 2 0 5 0 8 0 11 0 14 0 17 0 20 0 3 5 2 0 40 0 2 0 5 0 8 0 11 0 14 0 17 0 20 0 1 0 681XXB MODEL NUMBER POWER LEVEL PARAMETERS dBm L0 L1 L2 L3 L4 L5 L6 L7 L8 L9 68137B 1 0 0 0 1 0 2 0 3 0 4 0 5 0 6...

Страница 38: ...parameters If you wish to follow along on your synthesizer you can obtain this same menu display by resetting your instrument press SYSTEM then press Reset Opening the Parameter In order for the valu...

Страница 39: ...urn the knob clock wise or counter clockwise to increase or decrease the value of the parameter by the unit size Turning the knob rapidly changes the value of the parame ter in larger steps Using a Se...

Страница 40: ...terminated in GHz MHz kHz or Hz however it is al ways displayed on the data display in GHz A time entry may be terminated in Sec ms s or ns however it is always displayed on the data display in Sec If...

Страница 41: ...the CW frequency mode Selecting a CW Frequency There are several ways to select a CW frequency for output You can 1 edit the current frequency 2 en ter a new frequency or 3 select one of the 20 pre s...

Страница 42: ...s you tag edit or output a frequency from the list Use the cursor control key to select a frequency from the frequency list The selected frequency is highlighted in reverse video and displayed in full...

Страница 43: ...d Scan Dn keys Return to the CW Frequency Control menu by press ing Previous Menu Selecting a Power Level While in the CW frequency mode you can edit the current CW frequency output power level or ent...

Страница 44: ...lets you set the ramp speed and turn the CW ramp on off To set ramp speed press Sweep Time The sweep time parameter opens for editing Edit the current sweep time using the cursor control key or rotary...

Страница 45: ...r s output frequency is swept between selected start and stop frequencies When the sweep width is 100 MHz the sweep is phase lock corrected at both the start and stop frequencies and at each band swit...

Страница 46: ...rameter for editing press Sweep Time Edit the current sweep time using the cursor control key or the rotary data knob or en ter a new sweep time using the key pad and appro priate termination key To c...

Страница 47: ...A single sweep starts when the trigger key is pressed If a sweep is in progress when the key is pressed it aborts and resets To go to the Analog Sweep Trigger menu shown be low from the Analog Sweep R...

Страница 48: ...from a step sweep menu To place the 681XXB in step sweep frequency mode press the main menu key CW SWEEP SELECT At the resulting menu display press Step The Step Sweep Menu shown below is then display...

Страница 49: ...Press Step Size to open the step size parameter Press Num of Steps to open the number of steps parameter Open the parameter you wish to change then edit the current value using the cursor control key...

Страница 50: ...ps between the start and stop frequencies are controllable from the manual sweep menu To place the 681XXB in manual sweep frequency mode press the main menu key CW SWEEP SELECT At the resulting menu d...

Страница 51: ...pens the stop frequency parame ter Edit the open frequency parameter using the cursor control key or the rotary data knob When you are finished close the open parameter by pressing its menu edit soft...

Страница 52: ...mined by the dF fre quency parameter F6 dF provides a symmetrical frequency sweep about the center frequency F6 The sweep width is determined by the dF fre quency parameter To select one of the preset...

Страница 53: ...or enter a new output power level for the frequency sweep Editing the Current Power Level Press Edit L1 to open the power level parameter then edit the current power level using the cursor control ke...

Страница 54: ...produces an intensified dot on a CRT display at each marker fre quency Intensity markers are only available in the analog sweep frequency mode and are obtained from a momentary dwell during the sweep...

Страница 55: ...eady tagged pressing Tag will untag it re move the m Activating Markers The soft keys Video Markers and Intensity Markers toggle the markers on and off Video Markers To output the tagged marker fre qu...

Страница 56: ...ode for analog sweeps start with the Analog Sweep Menu display to select the alternate sweep mode for step sweeps start with the Step Sweep Menu display shown be low To go to the Alternate Sweep menu...

Страница 57: ...the alternate sweep is now active 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 th...

Страница 58: ...Sweep menu press Alt Level Select the power level for the alternate sweep range L0 L1 L2 L3 or L4 The menu then displays the current level parameter for the selected power level If you wish to change...

Страница 59: ...s the main menu key LEVEL ALC SELECT At the resulting menu display press Level The Level Menu shown below is displayed This menu lets you perform the following Edit the power level parameter Edit the...

Страница 60: ...the following Select preset power levels L0 L1 L2 L3 or L4 for output Go to the Level List menu Go to the Tagged Levels menu Level List To go to the Level List menu shown be low press Level List This...

Страница 61: ...ct another level from the list and press Output Level On the level list the output power level selection is marked by a black square or if tagged an L highlighted in reverse video When you are finishe...

Страница 62: ...ue and apply it to the dis played power level go to the Level Menu Then press Edit Offset As shown in the following menu this opens the offset parameter for editing Edit the current offset value using...

Страница 63: ...single CW fre quency Menus provided let you set or select the sweep range the step size the dwell time per step and the sweep trigger To place the 681XXB in a CW power sweep mode from a CW frequency...

Страница 64: ...open the step size parameter Press Num of Steps to open the number of steps parameter Open the parameter you wish to change then edit the current value using the cursor control key or ro tary data kn...

Страница 65: ...trigger key is pressed If a sweep is in pro gress when the key is pressed it aborts and re sets To go to the CW Level Sweep Trigger menu shown below from the CW Level Sweep Ramp menu press Trigger Me...

Страница 66: ...ent power level sweep range start by opening either the start or stop power level pa rameter in the display above Edit L1 opens the start power level parameter Edit L2 opens the stop power level param...

Страница 67: ...rs for each preset sweep range Setting a Preset Power Level Sweep Range At the Level Sweep Control menu select the power level sweep range L1 L2 L3 L4 L5 L6 L7 L8 or L9 L0 that you wish to set The men...

Страница 68: ...lect an analog sweep frequency step power mode start with an analog sweep menu display to select a step sweep frequency step power mode start with a step sweep menu display Then press the main menu ke...

Страница 69: ...ameter Press Num of Steps to open the number of steps 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...

Страница 70: ...ith frequency in a test setup The following paragraphs provide descriptions and operating instruc tions for the power leveling modes and functions Use the Leveling Modes menu map Chapter 4 Figure 4 9...

Страница 71: ...nu To go to the Leveling Menu from the ALC Mode menu press Leveling Menu The Leveling Menu shown below is displayed To select internal ALC press Internal Pressing one of the other leveling menu soft k...

Страница 72: ...t from an external detector press External Detector To select the external ALC input from a power me ter press Power Meter After you have made the external ALC input connec tion and selected the senso...

Страница 73: ...nstalled are used to control the relative power level Power is not detected at any point and the absolute power level is uncalibrated Fixed gain mode is selected from the leveling menu Press Leveling...

Страница 74: ...shown below is displayed This menu lets you decouple the step attenuator from the ALC set the power level and set the at tenuation in 10 dB steps Press Decouple to decouple the step attenuator from th...

Страница 75: ...th the power slope and the pivot point The ALC loop menu lets you activate the ALC power slope function To go to the ALC Loop Menu from the Level ALC Control Menu display press ALC Loop The ALC Loop M...

Страница 76: ...or ed iting Edit the current slope value using the cursor control key or rotary data knob or enter a new value using the key pad and the STEPS termination key When you have finished setting the open p...

Страница 77: ...el is accom plished by summing a power offset word from the power offset table with the sweep generator s nor mal power level DAC word at each frequency point Up to five user level flatness correction...

Страница 78: ...n the test setup where the corrected power level is desired Power Meter Model and GPIB Address In order for the 681XXB to control the power meter the GPIB address and power meter model must be selecte...

Страница 79: ...wer meters are the Anritsu ML4803A and Hewlett Packard 437B 438A and 70100A Press Previous Menu to return to the main Config ure GPIB menu display At the Configure GPIB menu press Previous Menu to ret...

Страница 80: ...er 3 User 4 or User 5 that you wish to create Next set the measurement frequency range by pressing Edit Start or Edit Stop to open the start Flo or stop Fhi frequency parameter for editing Edit the cu...

Страница 81: ...ting the power offset table the set power level is delivered at the point where the calibration was performed To activate the selected power offset table and apply user level flatness correction to th...

Страница 82: ...OUTPUT ON OFF key Step 2 Press the LINE OPERATE STANDBY key to turn the instrument on Step 3 When the first menu is displayed after the start up display release the RF OUT PUT ON OFF key The contents...

Страница 83: ...de of the RF output changes linearly as the exter nal AM input changes In Log AM mode sensitivity is 10 dB V and the sweep generator accepts a wider range of input sig nals from the external signal ge...

Страница 84: ...connector Press On Off to turn AM on and off Both the AM status display and AM modulation status area will reflect your selection Press Log Linear to select the AM operating mode The AM status displa...

Страница 85: ...e allows maximum deviations of 50 MHz In Wide mode the FM signal is synthesized by ap plying the modulating signal to the main tuning coil of the YIG tuned oscillator Wide FM mode allows maximum devia...

Страница 86: ...elect the front or rear panel FM IN connector The FM status display will reflect you selection Press 600 50 to select the input impedance of the input connector The FM status display will re flect you...

Страница 87: ...g are the menu selections necessary to provide square wave pulse modulation of the out put signal using a modulating signal from both the internal and external sources Press MODULATION At the resultin...

Страница 88: ...ch input connector is selected Press L RF On H RF On to select the polarity of the signal that triggers the RF on Press More to go to the additional menu Internal Source Frequency Selection If you hav...

Страница 89: ...then when you press More the menu shown below is displayed Press Front Rear to select the front or rear panel IN connector The Square Wave status display shows your selection as Source Press Previous...

Страница 90: ...terminator and incre ment sizes for frequency power level and time parameters Use the System Configuration menu map Chapter 4 Figure 4 13 to follow the menu sequences To go to the System Configuration...

Страница 91: ...om the System Configuration menu press Front Panel The Configure Front Panel Menu shown below is displayed Press Brite repeatedly to increase the intensity of the data display to the desired level Pre...

Страница 92: ...lanking signal output is available at the rear panel AUX I O connec tor The display will reflect your selection Press Penlift to select normally open N O or nor mally closed N C contacts on the intern...

Страница 93: ...F to select RF On or Off during re trace The display will reflect your selection Press Delta F RF to select RF On or Off during fre quency switching in CW or step sweep modes The display will reflect...

Страница 94: ...lt GPIB address is 5 Enter a new address between 1 and 30 using the cursor control key or the data en try keypad and the terminator key Hz ns ADRS The new GPIB address will appear on the display Press...

Страница 95: ...tion Press Pwr Mtr Address to change the address of the power meter on the GPIB the power meter s de fault GPIB address is 13 Enter a new address be tween 1 and 30 using the cursor control key or the...

Страница 96: ...displayed Press Freq Incr to open the frequency increment parameter Press Level Incr to open the power level increment parameter Press Time Incr to open the time increment pa rameter Open the paramet...

Страница 97: ...number between 0 and 9 on the keypad The setup is now saved NOTE Setup 0 automatically saves the current front panel settings when the instrument is shutdown using the front panel LINE key Therefore...

Страница 98: ...ERATE STANDBY key to turn the instrument on Step 3 When the first menu is displayed after the start up display release the RF OUTPUT ON OFF key The contents of non volatile memory have now been erased...

Страница 99: ...cure mode and how to return to normal op eration To place the 681XXB in the secure mode first press SYSTEM to display the System Menu Next press Secure This places the sweep gener ator in the secure m...

Страница 100: ...Table of Contents 4 1 INTRODUCTION 4 3 4 2 MENU MAP DESCRIPTION 4 3 Chapter 4 Local Operation Menu Maps...

Страница 101: ...f each menu s soft keys is provided If a menu soft key se lects another menu then it is shown linked to that menu Figure 4 1 on page 4 5 is a sample menu map annotated to identify the key ele ments Th...

Страница 102: ...nt Power Level CW Ramp On Off Set The Sweep Time Typical Menu Soft Key Functional Description Points To The Menu Displayed Whenever The Menu Soft Key Is Depressed A Main Menu Display Main Menu Key Cur...

Страница 103: ...d Frequency Edit Current Power Level Edit Current Frequency Edit Current Power Level Edit Current Power Level On Off Set The Sweep Time Set Slave DF Frequency Set Slave Main Power Level Master Slave O...

Страница 104: ...Sweep Time On Off On Off On Off On Off On Off On Off Edit Start Frequency Edit End Frequency Edit Current Power Level Tag Untag Highlighted Marker Frequency Edit Highlighted Marker Frequency On Off On...

Страница 105: ...n Off On Off On Off Edit Step Size Edit Number of Steps Edit Start Frequency Edit End Frequency Edit Current Power Level Tag Untag Highlighted Marker Frequency Edit Highlighted Marker Frequency N A On...

Страница 106: ...MODULATION CW SWEEP SELECT FREQUENCY CONTROL LEVEL ALC SELECT LEVEL CONTROL Edit Start Frequency Edit End Frequency Edit Start Frequency Edit End Frequency Edit Current Power Level Edit Step Size Edit...

Страница 107: ...NTROL Display Showing Level Offset On Edit Current Power Level Output Previous Tagged Power Level Edit Current Power Level Tag Untag Highlighted Power Level Edit Highlighted Power Level Output Highlig...

Страница 108: ...TION CW SWEEP SELECT FREQUENCY CONTROL LEVEL ALC SELECT LEVEL CONTROL On Off Edit Step Size Edit Dwell TIme On Off On Off Edit Number of Steps Edit End Power Level Edit Start Power Level Edit End Powe...

Страница 109: ...REQUENCY CONTROL LEVEL ALC SELECT LEVEL CONTROL SYSTEM MODULATION CW SWEEP SELECT FREQUENCY CONTROL LEVEL ALC SELECT LEVEL CONTROL Edit Start Power Level Edit End Power Level Edit Start Power Level Ed...

Страница 110: ...10dB Steps Press To Decrease Attenuation 10dB Steps ALC Slope On Off Edit The ALC Slope Edit The Pivot Point Selects Front Panel External ALC Input Selects Rear Panel External ALC Input Set The Exter...

Страница 111: ...ROL SYSTEM MODULATION CW SWEEP SELECT FREQUENCY CONTROL LEVEL ALC SELECT LEVEL CONTROL Log AM 10dB V or Linear AM 100 V Front Panel Input or Rear Panel Input 600 or 50 Input Impedance AM On Off Displa...

Страница 112: ...DULATION CW SWEEP SELECT FREQUENCY CONTROL LEVEL ALC SELECT LEVEL CONTROL FM On Off Wide FM Mode or Narrow FM Mode 600 or 50 Input Impedance Select Sensitivity Display Showing FM Selected On Unlocked...

Страница 113: ...are Wave Source LOW Level Triggers RF or HIGH Level Triggers RF Select Frequency Square Wave Modulation On Off Internal Square Wave Source or External Square Wave Source LOW Level Triggers RF or HIGH...

Страница 114: ...Display Dims The Display Select RF On or Off During Retrace Select Reset For Single Sweep 0 For Bottom of Sweep Ramp 10 For Top of Sweep Ramp Select RF On or Off During Frequency Switching In CW and...

Страница 115: ...CKOUT 5 4 Power Up 5 4 Self Test 5 4 Resetting the 681XXB 5 4 Warmup Time 5 4 5 5 CW FREQUENCY ACCURACY TEST 5 5 Test Setup 5 5 Test Procedure 5 6 5 6 POWER LEVEL TESTS 5 11 Test Setup 5 11 Power Leve...

Страница 116: ...ocopied and used to record the results of operational verification testing of your 681XXB These tables are included as part of the operational verifica tion test procedures and contain test informatio...

Страница 117: ...e instrument PCBs and other internal assemblies To self test the signal generator press SYSTEM Then press the System Menu soft key Selftest When the self test is complete the sweep generator displays...

Страница 118: ...t If the Fre quency Counter has an INT EXT toggle switch ensure the switch is set to EXT Step 2 Connect the 681XXB RF OUTPUT to the Frequency Counter RF Input as follows a For measuring frequencies of...

Страница 119: ...unter read ing meets specifications 100 Hz of the value shown on the test record for stand ard models 10 Hz for instruments with Option 11 Step 3 Record the Frequency Counter reading on the test recor...

Страница 120: ...____ 2 000 002 000 _____________________ 2 000 003 000 _____________________ 2 000 001 000 _____________________ 2 000 004 000 _____________________ 2 000 002 000 _____________________ 2 000 005 000 _...

Страница 121: ...00 000 000 _____________________ 38 000 000 000 _____________________ 40 000 000 000 _____________________ 2 000 001 000 _____________________ 2 000 002 000 _____________________ 2 000 003 000 _______...

Страница 122: ...____________ 2 000 000 100 0 _____________________ 2 000 000 200 0 _____________________ 2 000 000 300 0 _____________________ 2 000 000 100 0 _____________________ 2 000 000 400 0 ___________________...

Страница 123: ...32 000 000 000 0 _____________________ 35 000 000 000 0 _____________________ 38 000 000 000 0 _____________________ 40 000 000 000 0 _____________________ 2 000 000 100 0 _____________________ 2 000...

Страница 124: ...ws Step 1 Calibrate the Power Meter with the Power Sensor Step 2 Connect the Power Sensor to the RF OUT PUT of the 681XXB Step 3 Connect the 681XXB rear panel HORIZ OUT to the Oscilloscope CH 1 input...

Страница 125: ...e current power level parameter for editing e Set L1 to the power level noted on the test record Step 2 Measure the output power level with the Power Meter and record the reading on the test record St...

Страница 126: ...set The CW Menu is displayed b Press Step to place the 681XXB in the step sweep frequency mode and dis play the Step Sweep Menu c With the Step Sweep menu displayed press the main menu key FREQUENCY C...

Страница 127: ...NOTE Monitor the 681XXB s Horizontal Output on the Oscilloscope to deter mine sweep start and stop Step 2 As the 681XXB steps through the full fre quency range measure the maximum and minimum Power M...

Страница 128: ...the Analog Sweep menu dis played press the main menu key FREQUENCY CONTROL The Sweep Frequency Control menu shown below is displayed d Press Full to select a full range fre quency sweep e Press Edit...

Страница 129: ...81XXB s Horizontal Output on the Oscilloscope to deter mine sweep start and stop Step 4 During the analog sweep measure the maximum and minimum Power Meter readings and record the values on the test r...

Страница 130: ...m _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm Specification is 1 0 dB Power Level Flatness Step Sweep Set Power Ma...

Страница 131: ..._________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm Specification is 1 0 dB Power Level Flatness Step Sweep Set Power Max...

Страница 132: ...______dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm Specification is 1 0 dB Power Level Flatness St...

Страница 133: ...____dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm Specification is 1 0 dB Power Level Flatness Step...

Страница 134: ...m _________dBm _________dBm 13 dBm 12 dBm 11 dBm 10 dBm 9 dBm 8 dBm 7 dBm 6 dBm 5 dBm 4 dBm 3 dBm 2 dBm 1 dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm...

Страница 135: ..._________dBm _________dBm 11 dBm 10 dBm 9 dBm 8 dBm 7 dBm 6 dBm 5 dBm 4 dBm 3 dBm 2 dBm 1 dBm 0 dBm 1 dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm __...

Страница 136: ...___dBm _________dBm _________dBm _________dBm 17 dBm 16 dBm 15 dBm 14 dBm 13 dBm 12dBm 11 dBm 10 dBm 9 dBm 8 dBm 7dBm 6 dBm 5 dBm _________dBm _________dBm _________dBm _________dBm _________dBm _____...

Страница 137: ..._dBm _________dBm _________dBm _________dBm 15 dBm 14 dBm 13 dBm 12 dBm 11 dBm 10 dBm 9 dBm 8 dBm 7 dBm 6 dBm 5 dBm 4 dBm 3 dBm _________dBm _________dBm _________dBm _________dBm _________dBm _______...

Страница 138: ...dBm 3 dBm 4 dBm 5 dBm 6 dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm Spe...

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Страница 153: ...Bm 1 dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm _________dBm 3 dBm 2 dBm 1 dBm 0 dB...

Страница 154: ...ESSAGES 6 3 Self Test Error Messages 6 3 Normal Operation Error and Warning Status Messages 6 8 6 3 TROUBLESHOOTING 6 10 6 4 ROUTINE MAINTENANCE 6 13 Replacing the Line Fuse 6 13 Cleaning the Fan Filt...

Страница 155: ...ostics that self test the instrument These self test diagnos tics perform a brief go no go test of most of the in strument PCBs and other internal assemblies You can perform a sweep generator self tes...

Страница 156: ...perating temperature The 681XXB is still operable but frequency accuracy and stability may be degraded Error 109 The 100MHz Reference is not Locked to the External Reference Indicates the reference lo...

Страница 157: ...e will not appear when the RF output goes unleveled Error 122 Level Reference Failed Indicates a failure of the level reference circuitry on the A10 PCB Use caution and always determine the output pow...

Страница 158: ...uency range Use caution and always determine the output power level when operating the 681XXB in this condition Error 134 13 25 20 GH Switched Filter Indicates a failure in the 13 25 20 GHz switched f...

Страница 159: ...e DAC on the A10 PCB The 681XXB still operates normally but RF output level flatness may be affected during analog frequency sweeps Error 144 RF was Off when Selftest started Some tests were not perfo...

Страница 160: ...eatly reduced Normally caused by an internal component failure Run self test to verify malfunction RANGE Displayed in the frequency parameters area when 1 the analog sweep start frequency entered is g...

Страница 161: ...the power level usually clears the warning UNLOCKED When FM is selected ON this warning message appears indicating that the instrument is not phase locked during the FM mode of operation EXT REF This...

Страница 162: ...e power source then check the line fuse on the rear panel If the fuse is defective replace see page 6 13 If the fuse is good go to the next step Step 2 Check to see if power is available at the power...

Страница 163: ...operating clean the air filter see page 6 14 If the fan is not operating call a service technician LOCK ERROR is Displayed Trouble Description This message is displayed in the frequency pa rameters ar...

Страница 164: ...e F value entered re sults in a sweep outside the range of the instrument 3 the step size value entered is greater than the sweep range or 4 the number of steps entered results in a step size of less...

Страница 165: ...hese line fuse values are printed on the rear panel next to the fuse holder Step 1 Disconnect the 681XXB from the power source Step 2 Using a small flat blade screwdriver turn the fuse cap counter clo...

Страница 166: ...ep 2 Vacuum the honeycomb filter to clean it Step 3 Install the filter guard back on the rear panel Step 4 Press in on the panel fasteners to secure the filter guard to the rear panel Cleaning the Dat...

Страница 167: ...ter Slave Operation 7 7 Master Slave Operation in VNA Mode 7 7 Terminating Master Slave Operation 7 9 7 3 USE WITH A 562 SNA 7 10 Connecting the 681XXB to the 562 7 10 7 4 USE WITH A 360B VNA 7 12 Con...

Страница 168: ...ons 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...

Страница 169: ...ter and Slave 68XXXBs Step 3 Connect one end of a coaxial cable to the rear panel 10 MHz REF OUT connector on the Master 68XXXB Connect the other end to the rear panel 10 MHz REF IN con nector on the...

Страница 170: ...er Slave Menu display below This menu lets you perform the following Go to the Slave Frequencies List menu Set the dF frequency for the Slave unit Set the Slave unit s main power level L1 Set the alte...

Страница 171: ...ess Previous Menu to return to the Master Slave menu below The Master Slave menu lets you set the dF fre quency and L1 and L2 power level parameters for the Slave unit Press Slave DF to open the dF fr...

Страница 172: ...whenever the F1 F2 sweep range is selected on the Master 68XXXB The Master 68XXXB will sweep from F1 F2 with the values of F1 and F2 defined in the Master unit s frequency list Master Slave Operation...

Страница 173: ...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 Previous Menu to return to the Slave...

Страница 174: ...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 At the Master Slave Menu display press Enable This terminates master s...

Страница 175: ...ing proce dures Using the Auxiliary I O Cable Connect the 681XXB to the 562 SNA as shown in Figure 7 2 Step 1 Connect one end of the Auxiliary I O ca ble P N 806 7 to the 562 rear panel AUX I O connec...

Страница 176: ...KER OUT connec tor Connect the other end of the cable to the 562 rear panel VIDEO MARKER IN PUT connector Step 4 Connect one end of a coaxial cable to the 681XXB rear panel DWELL IN connector Connect...

Страница 177: ...Step 1 Connect one end of a coaxial cable to the 681XXB rear panel FM IN connector Con nect the other end to the 360B rear panel EXT FM LOCK OUTPUT connector Step 2 Connect one end of a coaxial cable...

Страница 178: ...ration and operation of the 681XXB for both modes of operation are described in the following paragraphs Source Lock Mode When operating in source lock mode the 360B phase locks the frequency output o...

Страница 179: ...ck mode operation Initiating 360B Source Lock Mode Operations Turn on the 360B and configure it for source lock mode of operation Refer to the 360B VNA opera tion manual Once configured the 360B takes...

Страница 180: ...cy and phase sig nal so as to phase lock itself to the reference signal from the 681XXB Due to the inherent resolution of the 360B s frequency readout frequency resolution is limited to 1 kHz interval...

Страница 181: ...igure it for tracking mode of operation Refer to the 360B VNA operation man ual Once configured the 360B should take control of the sweep generator When the 360B takes control the display of all pa ra...

Страница 182: ...es 681XXB Synthesized Sweep Generator A 2 REAR PANEL CONNECTORS Figure A 1 provides a illustration of the rear panel and describes the rear panel connectors A 3 CONNECTOR PINOUT DIAGRAMS Figures A 2 a...

Страница 183: ...ch frequency step in step sweep mode Also when video markers are selected provides 5V marker pulses and a 10V se lected marker pulse during forward sweep BNC connector HORIZ OUT Provides a 0V to 10V r...

Страница 184: ...m an external controller via the IEEE 488 bus GPIB A pinout diagram for this con nector is shown in Figure A 3 SERIAL I O Provides access to two RS 232 terminal ports to support service and calibra ti...

Страница 185: ...ANKING Retrace Blanking Output Provides a 5V or 5V signal coincident with sweep retrace Signal polarity selected from a front panel menu 7 L ALT SWP L Alternate Sweep Output Provides a TTL low level s...

Страница 186: ...analog and step sweep modes The sweep resumes when the signal is removed 19 AUX 2 Aux 2 Auxiliary input output to the processor PC3 20 BANDSWITCH BLANK Bandswitch Blanking Output Provides a 5V or 5V s...

Страница 187: ...s have accepted the current data byte for internal processing 9 IFC Interface Clear A low true state places all bus instruments in a known quiescent state unaddressed to talk unaddressed to listen and...

Страница 188: ...s to 99 seconds PHASE LOCKED STEP SWEEP MODE Sweep Width Independently selected 1 kHz 0 1 Hz with Option 11 to full range Every frequency step in sweep range is phase locked Accuracy Same as internal...

Страница 189: ...s sweep frequency accuracy Marker Resolution Analog Sweep 1 MHz or Sweep Width 4096 whichever is greater Marker Resolution Step Sweep 1 kHz 0 1 Hz with Option 11 SWEEP TRIGGERING Sweep triggering is p...

Страница 190: ...dBm 2 to 20 GHz 3 5 dBm 20 to 26 5 GHz 68159B 13 dBm 2 GHz 9 dBm 2 to 20 GHz 6 dBm 20 to 26 5 GHz 11 dBm 2 GHz 7 dBm 2 to 20 GHz 3 5 dBm 20 to 26 5 GHz 68163B 9 dBm 2 to 20 GHz 6 dBm 20 to 40 GHz 7 d...

Страница 191: ...input signal range to an optimum value BNC connector front and rear panel External Power Meter Levels output power at a re mote power meter location Accepts a 1V full scale input signal from the remot...

Страница 192: ...Wave Symmetry 50 5 at all power levels External Input Front or rear panel BNC selectable from modulation menu Drive Level TTL compatible input Minimum Pulse Width 5 s Input Logic Positive true or nega...

Страница 193: ...s all instrument parameters to predefined de fault states or values Any pending GPIB I O is aborted Selectable from the system menu Master Slave Operation Allows two 681XXB output sig nals to be swept...

Страница 194: ...V signal co incident with sweep retrace Signal polarity selectable from system menu SEQ SYNC OUT Sequential Sync Output Provides a 5V signal during retrace at bandswitching points and dur ing each fre...

Страница 195: ...the RF output connector on the front panel 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 ma...

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