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2. O Diagrams T6H EU BBEE O O Q gu L ooocooocGooocoooo0o0o0 L uni oo0000000 000 0000 B 0075 0 0 0 0 16 8110 10101870 K621 z 315 a le CY S g 9 Len 9 DES t 5 EA ceo CN B 29 3 g as gt band N S a a BgigeU205 0324 mm B E a x U N cO co gt 05019 9303 Ja 5 g amp git 8 p D RH BE uzog Uz13 u31 5 U3078 gus fg absida 810319 2 H B B B E E Eg E E munan eo E mem emen FD E EU 8 U401 U403 U405 U407 U409 U5011 05039 R705 E L cO O cO O s s 2 8 8 E U N LO N LO 9 x x 8 S S x E cem 00000000000000000000 60 0000000000000000000 0000000000000000000 00000000000000000000 O O 0000000000000000000 0000000000000000000 P701 P702 O PCB EDGE 8 139 8 140 Diagrams 34925A Co
3. RE i la eb E koe 1002 2 34980A Service Guide 34922A Component Locator 8 Diagrams 311 Y201 U203 g 8 13 Usos USO 0519 B 0523 Usod 07 B g m RP311 U318 E s RP309 E m m Cg gh imi gg lg gc gh igo ib Dipi gg iyi ig isi gC Cog imi i si a isi ig ope gh la ge LLLIIIIEIJI IJI A Q o A Oo AAA 211512112112 miel ol II m m N M co A 5 A 6 1 o B lt A o x B S N sS A o o A o o P801 Cin Cun w am Cam Cu um Cum C ipa ua C Oun Cum gn Cg K604 K614 r AIRGAS ABE ISe ca cel M 2 1 e A A Q e 17321 0325 B BE LI JI IAE UN LI EL NE LIT
4. 144 34980A Service Guide 34937A Component Locator 000 HOt B m a ew i ERE D B BE S E 8 8 M Sog H m E x m E watt uot E LM PE MES ms ID mm NE NE D o 59310 o W317 C135 m aem mmm G en ss sZ sn ik ap an Q 7 di dh h h i i h igh DQ h i dpi dh i ie d dh d Qh LEM MN NEM MEME ES MES L IP NIE JF alle i d Lda 010 m P702 34980A Service Guide Diagrams 145 8 8 146 Diagrams 34938A Component Locator L4 4 JQIUIT
5. Sor B amp 3 o B Fa e N B Go B g 404 0 mm 15 90 in SLOT COVER A p ars 5 5 mm 0 22 in SQ M3 5 x 0 6 Thread 4 Places Specifications Product D 2 367 7 mm 14 48 in 36 Specifications 2 To Calculate Total DMM Measurement Error Each specification includes correction factors which account for errors present due to operational limitations of the optional internal DMM This section explains these errors and shows how to apply them to your measurements Refer to Interpreting Internal DMM Specifications on page 39 to get a better understanding of the terminology used and to help you interpret the internal DMM s specifications The internal DMM s accuracy specifications are expressed in the form of reading of range In addition to the reading error and range error you may need to add additional errors for certain operating conditions Check the list below to make sure you include all measurement errors for a given function Also make sure you apply the conditions as described in the footnotes on the specification pages If you are operating the internal DMM outside the
6. 9 viot 8 q Bs Uso B B B D Usos voor E 5 550 8 on B 8 8 5 LI mm er mati a m mB IE 8 Ta 311 now RP30d E 5 o mw m 5 aa 3 mon b P nl ba b jm bv i i Bs gi gh ih B in im i ih P WB LIA III LE LL IJI IIILTITII O dig ih igh ng inr iio ip LILIJIIJI I roa veso escas _ 7 P901 alae P902 La UJ 142 34980A Service Guide 34932A Component Locator 34980A Service Guide ol OJ 010180315 g 950 E om a E t Y201 an a ss ps fal BEES BETER m ES U205 0311 U317 JSE 3 es B EE rm B B E U31348 Usos a B em s 5 Oso nd b RP3I B RPSOS e uum om asqa qm n it at i tt wni m mom Sm qa f i o ht on gl pth sil s ph hb isi ph cig wa dyi dyb wil ap Ag ig th hg
7. gt m S m 5 fe fe IS w Iel el Ja Ja m I fo mila j fo Jal f allo HR e Im IR Nf fs IS IS o e e Jo o o lol o l lej lo ox l lo x Loe oe lo x m le e e o o o n o N xn 2 8 o o nr p nr 0m a 1944 441 4419449 mM NaS amp Aq 41 419449 Qo 15 116 ipie Dele DEDE tele Lele Lele oe to xUx xUx oc Loe oe 77 xUx oc do cc Uo oc Uo o o o o o o o o 6 o o G o o o o o o o 00 N 00 Nj m o co N 0 N f S ojlo mm N C901 s o Qe m mpm mn nmm o o o jo o o o o x Loc lo x oe lac x cc c 04 m lo C702 C601 34980A Service Guide 141 8 Diagrams 34931A Component Locator a B a e U205 mu o m ew B Bom pwu n kiss CU K924 J
8. Bank 1 Bank 2 Channel Relay Channel Relay 001 K601 015 K615 002 K602 016 K616 003 K603 017 K617 004 K604 018 K618 005 K605 019 K619 006 K606 020 K620 007 K607 021 K621 008 K608 022 K622 009 K609 023 K623 010 K610 024 K624 011 K611 024 K625 012 K612 026 K626 013 K613 027 K627 Form A Form A 029 K629 031 K631 030 K630 032 K632 4 111 4 Troubleshooting and Diagnostics 34938A 20 Channel High Current GP Switch The 34938A high current GP switch module provides twenty 5 A Form A relays for general purpose switching needs WO e Channel 001 5A Form A COM e amp e we Channel 020 5A Form A COM For the 34938A relay part numbers are given on page 130 and the component locator is shown on page 146 The table below shows the relationship of channel numbers to relay numbers Bank 1 Bank 2 Channel Relay Channel Relay 001 K501 O11 K511 002 K502 012 K512 003 K503 013 K513 004 K504 014 K514 005 K505 015 K515 006 K506 016 K516 007 K507 017 K517 008 K508 018 K518 009 K509 019 K519 010 K510 020 K520 112 34980A Service Guide Agilent 34980A Multifunction Switch Measure Unit Service Guide 5 Disassembly and Repair Electrostatic Discharge ESD Precautions 114 Surface Mount Repair 114 Tools Required 114 Basic Disassembly 115 Power Supply Removal 116 Power Supply Disassembly 117 KOM Removal 118 Front Panel Removal 119 Front Panel Disassembly 120 DMM Removal 121 Backplane Removal 122 RE A
9. 34931A 34932A 34933A 34934A Channels configurations dual 4x8 dual 4x16 dual 4x8 8x8 quad 4x32 4x128 8x8 4x16 8x16 4x32 4x16 quad 4x8 8x64 16x32 1 wire Switch type Armature Armature Reed Reed latching latching non latching non latching Input characteristics per channel Max volts 300 v 1 x 300 vI 150 V peak 2 100 V peak Max current DC AC RMS Switch current 1A 1A 0 5 AMl70 05 AU Q5A Carry current 2A 2A 1 5 Al4 0 05 AUI 0 5 A Power W VA 2 5l 60 W 60 W 10 wis 10 W Volt Hertz limit 108 108 108 10 Initial closed channel res 150 150 lt 15 0 20 97 10 1000 General Specifications Offset voltage lt 3uV 3yV lt 50 uV 20 uV lt 100 uV 1 wire lt 50 uV 1 wire DC Isolation ch ch ch earth gt 10 GO gt 10 GO gt 10 GO 10 GQ DC or AC RMS voltage channel to channel or channel to earth N Peak voltage channel to channel or channel to earth Ww Into analog bus System errors are included in the internal DMM measurement accuracy specifications With in rush resistors bypassed Bypassing resistors reduces lifetime of relays See the rated load relay life characteristics Un Limited to 6 W channel resistance power loss per module aD Power restrictions allow only 20 channels to be closed at one time N With 100 Q input protection resistors 10 Channel resistance is typically lt 1 5 Q but can be as high as 50 Q when a channel is used in measurement applications wit
10. 18 34980A Service Guide Specifications 2 34945A 34945EXT Module Specifications and Characteristics 34945EXT switch drive 64 channels low side drive mode Driver off voltage max 30V Driver off leakage current 500 pA Driver on current max 600 mA Driver on voltage max 0 5 V 8 600 mA 34945EXT switch drive 64 channels TTL drive mode Hi output voltage 3V lut 2 mA Lo output voltage 0 4 V lj 20 mA Lo input Current 20 mA 34945EXT position indicator sense inputs Channels 64 Lo input voltage max 0 8 V Hi input voltage min 25V Input resistance gt 100 kO Vi lt 5 V gt 20 kQ Vi gt 5 V Maximum input voltage 30 V 34945EXT switch drive power supply 34945EXT powered by 34945A Voltage 24 V nominal external power supply required for switches needing more than 24 V Current 100 mA continuous 200 mA 15 msec pulse 25 duty cycle 34945EXT external power connection Voltage range 4 75 V to 30 V Current limit 2A LED indicators current mode drivers Channels 64 Supply voltage 5 V nominal LED drive current 5 mA nominal programmable 1 to 20 mA Compliance voltage 0 8 V 34945EXT Dimensions 11 2 x 4 5 x 1 5 inches high with distribution boards installed 34980A Service Guide 19 2 Specifications 34950A 64 channel Digital 1 0 Specifications and Characteristics Digital input output charact
11. Cal mainframe cal memory write failure invalid while cal in progress Firmware and FPGA revision mismatch Cal no cal in progress DMM relay count data lost 34980A Service Guide 34980A Service Guide Firmware Update Errors Troubleshooting and Diagnostics These errors occur when attempting to update the mainframe internal DMM or plug in modules Erro r 791 792 793 794 795 796 797 798 799 800 810 811 Description Firmware update error unable to begin download Firmware update error programming operation failed Firmware update error data record invalid character Firmware update error data record length mismatch Firmware update error data record checksum mismatch Firmware update error bad checksum for download start Firmware update error bad checksum for download complete Firmware update error download in progress Firmware update error unable to complete download Firmware update error invalid programming address State has not been restored Operation has not been implemented 4 87 4 Troubleshooting and Diagnostics Plug In Module Errors These errors are related to the plug in modules and often indicate a failing module Error 901 902 903 904 905 906 907 908 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 88 Description Module hardware unexpected data recei
12. Internal DMM Adjustments on page 60 Perform the DAC adjustment procedures if either the 34951A 34951A 4 Ch Isolated DAC Module on page 66 or 34952A 34952A Multifunction Module on page 71 is installed Secure the instrument against calibration Note the new security code and calibration count in the instrument s maintenance records The 34951A 4 Ch Isolated DAC is intended to be adjusted frequently to compensate for changes in the module s environment These adjustments can be made either volatile or non volatile See page 66 for details Aborting a Calibration in Progress Sometimes it may be necessary to abort a calibration after the procedure has already been initiated You can abort a calibration at any time on any module by turning off the power You can abort a calibration on the internal DMM or the 34951A 4 Ch Isolated DAC by issuing a remote interface device clear message You can abort a calibration on the 34952A Multifunction Module by sending the CALibration ABORt command CAUTION If you abort a calibration in progress when the instrument is attempting to write new calibration constants to EEPROM you may lose all calibration constants for the function Typically upon re applying power the instrument will report error 705 Cal Aborted You may also generate errors 740 through 746 If this occurs you should not use the instrument until a complete re adjustment has been performed For a list of calibrati
13. Annunciator Display Indicators Display Indicator LAN USB GPIB ABUS 1234 ERRO Rmt Safety Interlock Trig HO ALARM H1234L Mx B 4W OC vii NWA NA NZ i NZI NZ NZI NA NA NZI i Z NZI Ml NA VN VIN ANI ANI AN IAN lN NI ANI ANI IN X Agliont Technologies 94 GRGRERRERRERER EERO EEREEEEREEEEEREE ABI ALARM LAN USB 259 EIMI Amt 188105 Trig 12341 Mx B 4w oc NA NZ NZ NZ MZ NZ MZ NZ NZ MZ NZ MZ NZ MZ NZ MZ NZ NZ PN BN PN BN al Ly Cy Cy Ly Ly CLA C Definition Communicating with the 34980A over LAN Communicating with the 34980A over USB Communicating with the 34980A over GPIB Analog Bus Connectivity Normally designated ABus connected on any module in mainframe During scan if ABus 1 and ABus 2 are indicated they will be used at some point during the scan An error has been generated and is in the error queue Remote Running a program puts the display into remote and disables the front panel keys Pressing the LOCAL button takes you out of remote mode and enables the front panel keys ABus Safety Interlock Terminal block or cables have been removed from the D sub connector of a module For more information see the Agilent 34980A User s Guide Waiting for external or manua
14. 0 of range 5 60 50 0 001 of range 5 300 0 001 of range 4 600 0 01 of range Auto Zero OFF Operation Following instrument warm up at calibration temperature 1 C and lt 10 minutes add 0 0002 range additional error 5 uV For 300 VDC instead of 0 0002 of range use 0 00066 of range Settling Considerations Reading settling times are affected by source impedance low dielectric absorption characteristics and input signal changes AC Operating Characteristics 15 Function Digits 16 Readings s AC Filter ACV ACI 6 7 s reading Slow 3 Hz 6 1 Medium 20 Hz 5 g Ul Fast 200 Hz 6 10 Fast 200 Hz 6 100 81 Fast 200 Hz Reading speeds for 60 Hz and 50 Hz operation autozero OFF 6 0 digits 22 bits 5 2 digits 18 bits 4V2 digits 15 bits Add 20 for DCV 4 HA for DCI or 20 mQ for resistance For 300 VDC multiply the additional noise error by 3 3 6 0 digits 22 bits 5 2 digits 18 bits 4V2 digits 15 bits Maximum limit with default settling delays defeated For external trigger or remote operation using default settling delay Delay Auto Maximum reading rates for 0 01 of AC step additional error Additional settling delay required when input DC level varies 33 2 Specifications System Specifications and Characteristics Scanning inputs Analog 34921A 34922A 34923A 34924A and 34925A multiplexer channels Digital 34950A 52A digital i
15. 058 K504 010 019 020 K404 030 059 060 K504 011 021 022 K401 031 061 062 K501 012 023 024 K401 032 063 064 K501 013 025 026 K403 033 065 066 K503 014 027 028 K404 034 067 068 K504 015 029 030 K405 035 069 070 K505 016 031 032 K402 036 071 072 K502 017 033 034 K403 037 073 074 K503 018 035 036 K404 038 075 076 K504 019 037 038 K405 039 077 078 K505 020 039 040 K405 040 079 080 K505 Backplane Backplane 911 K611 92 K621 912 K612 922 K622 913 K613 923 K623 914 K614 924 K624 97 98 4 Troubleshooting and Diagnostics 34924A 70 Channel Reed Multiplexer The high density 34924A 70 Channel Reed Multiplexer 70 Ch Reed MUX is divided into two banks with 35 non latching reed switches channels 1 35 and 36 70 in each This module also contains eight armature Analog Bus relays channels 911 914 and 921 924 four on each bank that can connect the bank relays to the system Analog Buses Through ABus1 and ABus2 you can connect any of the channels to the system DMM for voltage or resistance measurements See the simplified schematic below NOTE Bank relays Reed non latching Analog Bus relays Armature non latching 34980A Service Guide Troubleshooting and Diagnostics 4 For the 34924A relay part numbers are given on page 127 and the component locator is shown on page 159 The table below shows the relationship of channel numbers to rel
16. 9107 ium J PU x rm ee K621 2 34 m C ES Fn amp EE Em K611 2 WU F sk saa NOS m P 103 Y Co EE pas s N De g I pep ees 211 TE 5 a oN a EB Se Be mef IE oS a r E EJ EJ V sis Ds c z E cu p x C m B 567 J 19 g S al 5 O gt 8 B 2 jel i i Em gt ee eT Le L r D o j m 9 5 gt gt a Boe is rf isl po res rc t By CC ee 22 JA B B aa 315 ES El El E amp E Es wa PATS B Pe PO aos Re Re 059 n n U41 1 U40 04050400511 B zu E amp m 5 m E 2 K403 K503 o st a e lt LO 3 S x x x A a 138 34980A Service Guide 34924A Component Locator 34980A Service Guide
17. Plug in Module Test Considerations 65 34951A 4 Ch Isolated DAC Module 66 34952A Multifunction Module 71 Relay Plug in Modules 73 Thermocouple Reference Junction 34921A Optional 75 34980A Service Guide 4 Troubleshooting and Diagnostics Troubleshooting Hints 78 Power Supply 79 Product Firmware Updates 79 Instrument Errors 80 Error Numbers 82 Isolate a Problem with a Plug In Module 90 Relay and FET Replacement 91 34921A 40 Channel Armature Multiplexer with Low Thermal Offset 34922A 70 Channel Armature Multiplexer 94 34923A 40 80 Channel Reed Multiplexer 96 34924A 70 Channel Reed Multiplexer 98 34925A 40 80 Channel Optically Isolated FET Multiplexer 100 34931A Dual 4x8 Armature Matrix 102 34932A Dual 4x16 Armature Matrix 104 34933A Dual Quad 4x8 Reed Matrix 107 34937A 32 Channel GP Switch 111 34938A 20 Channel High Current GP Switch 112 5 Disassembly and Repair 34980A Service Guide Electrostatic Discharge ESD Precautions 114 Surface Mount Repair 114 Tools Required 114 Basic Disassembly 115 Power Supply Removal 116 Power Supply Disassembly 117 KOM Removal 118 Front Panel Removal 119 Front Panel Disassembly 120 DMM Removal 121 Backplane Removal 122 92 6 Replaceable Parts 7 Backdating 8 Diagrams To Order Replaceable Parts Backdating and Part Changes Mainframe Replaceable Parts 34921A Replaceable Parts 34922A Replaceable Parts 34923A Replaceable Parts 34924A Replaceable Parts 34925A R
18. again to increase the scrolling speed the final key press cancels the scroll All errors are cleared when you exit the menu Remote Interface Operation SYSTem ERRor Read and clear one error from the queue Errors have the following format the error string may contain up to 80 characters 113 Undefined header 34980A Service Guide 81 4 Troubleshooting and Diagnostics Error Numbers The following sections list the error numbers and error descriptions that may be reported by the instrument Not all these errors indicate a hardware failure Execution Errors These errors typically do not indicate a hardware failure They are related to illegal or improper operation of the instrument using the remote interface Erro r 101 102 103 113 123 213 222 222 224 230 231 313 313 314 314 315 315 321 350 350 410 420 82 Description Invalid character Syntax error Invalid separator Undefined header Numeric overflow INIT ignored Data out of range value set to upper limit Data out of range value set to lower limit Illegal parameter value ranges must be positive Data stale Internal software error Calibration memory lost memory corruption detected Calibration memory lost due to firmware revision change Save recall memory lost memory corruption detected Save recall memory lost due to firmware revision change Configuration memory lo
19. switches not the scan model For example send conf fres 100 rout clos 1001 1021 1911 1922 read should return something close to zero cal val 0 cal In this manual the direct ABus connection is the one described Connections for the ABus connector are shown below souco ens fe P En sy oMw Cure DMM Sense HI Pin 8 j 3 DMM Sense LO 6 9 gt L AC V 2 and 4 Wire Ohms Connections e gt L _ 4 wire Ohms Connections e M e 6 SN 1 OJ O 5 9 lt gt L DC AC Current Connections M 6 Use shielded twisted pair PTFE insulated cables to reduce settling and noise errors Connect the shield to the source LO output PTFE is a registered trademark of E I du Pont de Nemours and Company 52 34980A Service Guide Calibration Procedures 3 DMM Test Considerations Errors may be induced by ac signals present on the input leads during a self test Long test leads can also act as an antenna causing pick up of ac signals For optimum performance all procedures should comply with the following recommendations Assure that the calibration ambient temperature is stable and between 18 C and 28 C Ideally the calibration should be performed at 23 C 1 C e Assure ambient relative humidity is less than 80 Allow a 1 5 hour warm up period with a copper short connecting pins 3 4 8 and 9 of the ABus conne
20. 0 0030 0 0035 0 0040 0 0040 0 0050 0 0040 0 0005 0 0005 with 34921A 1 000000 V 0 0020 0 0006 0 0030 0 0007 0 0040 0 0007 0 0005 0 0001 22A 25A 31A 32A I 10 00000 V 0 0015 0 0004 0 0020 0 0005 0 0035 0 0005 0 0005 0 0001 Input impedance Hi Z 100 0000 V 0 0030 0 0006 0 0045 0 0006 0 0055 0 0006 0 0005 0 0001 10 V range and below 300 0000 V 0 0030 0 0020 0 0045 0 0030 0 0055 0 0030 0 0005 0 0003 Resistance 12 100 0000 Q 1mA 0 0030 0 0035 0 008 0 004 0 010 0 004 0 0006 0 0005 1 000000 1mA 0 0020 0 0006 0 008 0 001 0 010 0 001 0 0006 0 0001 10 00000 100 pA 0 0020 0 0005 0 008 0 001 0 010 0 001 0 0006 0 0001 100 0000 10 pA 0 0020 0 0005 0 008 0 001 0 010 0 001 0 0006 0 0001 1 000000 5 0 pA 0 002 0 001 0 008 0 001 0 010 0 001 0 0010 0 0002 10 00000 500nA 0 015 0 001 0 020 0 001 0 040 0 001 0 0030 0 0004 100 0000 MQ 500 10 0 300 0 010 0 800 0 010 0 800 0 010 0 1500 0 0002 DC current 34921 only 10 00000 lt 0 1 burden 0 005 0 010 0 030 0 020 0 050 0 020 0 002 0 0020 100 0000 lt 0 6 0 010 0 004 0 030 0 005 0 050 0 005 0 002 0 0005 1 000000 lt 2V 0 050 0 006 0 080 0 010 0 100 0 010 0 005 0 0010 One hour warm up and a fixed configuration with slow AC filter sine wave input and 6 2 digits 18 28 C Relative to calibration standards Temperature within 5 C of tempe
21. 036 071 072 U716 017 033 034 U617 037 073 074 U717 018 035 036 U618 038 075 076 U718 019 037 038 U619 039 077 078 U719 020 039 040 U620 040 079 080 U720 Backplane Relay Backplane Relay 911 K800 921 K804 912 K801 922 K805 913 K802 923 K806 914 K803 924 K807 101 4 Troubleshooting and Diagnostics 34931A Dual 4x8 Armature Matrix The 34931A dual 4x8 armature matrix contains two matrices each with 32 2 wire crosspoint latching armature relays organized in a 4 row by 8 column configuration Every row and column are made up of two wires each a high H and a low L Each crosspoint relay has a unique channel number representing the row and column that intersects to create the crosspoint For example channel 304 represent the crosspoint connection between row 3 and column 4 all columns consisting of two digits in this case the digits are 04 See the simplified schematic below Col 1 Matrix 1 Col 2 Col 3 Col 4 Col 5 Col 6 Col 7 Col 8 Row 1 Row 2 Row3 2 Row4 5 NOTE Three digit channel numbers are derived from the intersection of the rows and columns columns having two digits The intersection shown here represents Channel 304 Row 3 Column 4 Matrix 2 Col 2 Col 3 Col4 Col 5 Col 6 Col 7 Col 8 Analog Buses ABus1 Row 5 e DMM Row6 f MEAS ABus2 DMM SENS Row 7 G ABus3 Row 8 Matrix 1 and Matrix
22. 10 mv Ul 100 V 100 V 300 V 300 Input Frequency 1 kHz 50 kHz 1 kHz 50 kHz 1 kHz 50 kHz 10 Hz 1 kHz 1 kHz 50 kHz 1 kHz 50 kHz Range 100 mV 10 V 100 mV 100 V 300 V Quick Check Q Error from Nominal 24 hour 70 uV 150 uV 700 uV 1 5 mV 7 15 7 34uV 70 mV 150 mV 270 mV 600 mV 90 day 90 uV 160 900 1 6 mV 9 16 9 45 uV 90 mV 160 390 690 mV 1 100 uV 170 uV 1 1 7 mV 10 17 10 46uV 100 mV 170 mV 420 mV 720 mV 1 For this test isolate the calibrator s output from earth ground to prevent ground noise affecting the reading 2 Some calibrators may have difficulty driving the internal DMM and cable load at this V Hz output Use short low capacitance cable to reduce calibration loading Verification can be performed at gt 195 Vrms New test limits can be computed from the accuracy specification shown in the data sheet for the actual test conditions used Q Quick performance verification test points 34980A Service Guide 57 3 58 Calibration Procedures The 50 kHz ac voltage test points may fail performance verification if the DMM internal shields have been removed and reinstalled See Gain Adjustment on page 61 for further information on how to recalibrate the ac voltage function AC CURRENT Gain Verification Tes
23. 16V Q mV 12 9mV 10 V 8mV 7 4V 5mV OV Q 3mV 4V 5mV 8 V 7mV 10 V 8 mV 12 V 9 mV 16 V Q 11 mV Output Current Quick Error from Check Nominal 90 day 20 mA Q 23 uA 15 mA 18 5 uA 10 mA l4pA 5mA 9 5 uA 0 mA I Q 5uA 5 mA 9 5 uA 10 mA 14 uA 15 mA 18 5 uA 20 mA Q 23 uA 1 Apply a measured 0 offset to this measurement 70 34980A Service Guide Calibration Procedures 3 Analog Output Adjustment Install the 34951A module in the mainframe and allow a 1 hour warm up before performing these procedures This adjustment procedure sets a zero adjustment and a gain adjustment constant for each DAC output You must perform all the adjustments on one analog output channel before adjusting the other analog output channel 1 Install the module s in the instrument Remove any inputs from the ABus connector CAUTION Remove any ABus connector before performing this procedure 2 Set the calibration security for the adjustment mode you desire see page 66 3 Send the CALibration MODule slot command to begin the auto calibration procedure for all channels on the module in lt slot gt You may use the CALibration MODule ALL command to perform the auto calibration on all channels for all modules installed in the mainframe The complete procedure may take up to 1 minute per module Be sure to set the remote command time out value appropriately 4 The command returns
24. 2 are electrically separate from one another Matrix Relays Armature latching Analog Bus Relays Armature non latching 102 34980A Service Guide Troubleshooting and Diagnostics 4 For the 34931A relay part numbers are given on page 128 and the component locator is shown on page 142 The table below shows the relationship of channel numbers to relay numbers Matrix 1 Matrix 2 Channel Relay Channel Relay 101 K7101 501 K8501 102 K7102 502 K8502 103 K7103 503 K8503 104 K7104 504 K8504 105 K7105 505 K8505 106 K7106 506 K8506 107 K7107 507 K8507 108 K7108 508 K8508 201 K7201 601 K8601 202 K7202 602 K8602 203 K7203 603 K8603 204 K7204 604 K8604 205 K7205 605 K8605 206 K7206 606 K8606 207 K7207 607 K8607 208 K7208 608 K8608 301 K7301 701 K8701 302 K7302 702 K8702 303 K7303 703 K8703 304 K7304 704 K8704 305 K7305 705 K8705 306 K7306 706 K8706 307 K7307 707 K8707 308 K7308 708 K8708 401 K7401 801 K8801 402 K7402 802 K8802 403 K7403 803 K8803 404 K7404 804 K8804 405 K7405 805 K8805 406 K7406 806 K8806 407 K7407 807 K8807 408 K7408 808 K8808 Backplane 921 K921 922 K922 923 K923 924 K924 34980A Service Guide 103 4 Troubleshooting and Diagnostics 34932A Dual 4x16 Armature Matrix The 34932A dual 4x16 armature matrix contains two matrices each with 64 2 wire crosspoint latching armature relays organized in a 4 row by 16 column configuration Every row and column are made up of two wires each a high H
25. 34951A 34952A 34959A Description 40 channel armature multiplexer 40 80 channel reed multiplexer 40 80 channel optically isolated FET multiplexer 70 channel armature multiplexer 70 channel reed multiplexer Dual 4x8 armature matrix Dual 4x16 armature matrix Dual quad 4x8 reed matrix 32 channel Form C Form A general purpose switch 20 channel 5 amp Form A switch Quad 1x4 50 ohm 3 GHz RF multiplexer Quad 1x4 75 ohm 1 5 GHz RF multiplexer Microwave switch attenuator driver Dual 1x2 SPDT terminated microwave switch Triple 1x2 SPDT unterminated microwave switch 64 bit digital I O with memory and counter 4 channel isolated D A converter Multifunction module Breadboard module Repair Strategy Relay and Fuse replacement only Relay replacement only FET replacement only Relay and Fuse replacement only Relay replacement only Relay replacement only Relay replacement only Relay replacement only Relay replacement only Relay replacement only Module replacement Module replacement Module replacement Module replacement Module replacement Module replacement Module replacement Module replacement Module replacement 34980A Service Guide Troubleshooting and Diagnostics 4 Relay and FET Replacement 34980A Service Guide Failing relays and FET switches can be isolate to a specific channel and replaced There are two methods you can use to verify relays and switches Read the relay cycle count Measur
26. A component locator is shown on page 136 Component Locator F1041 F1042 F1043 F1044 K601 K602 K603 K604 K605 K606 K607 K608 K609 K610 K611 K612 K613 K614 K615 K616 K617 K618 K619 K620 K721 K722 K723 K724 K725 K726 K727 K728 K729 K730 K731 K732 K733 K734 K735 K736 K737 K738 K739 K740 K841 K842 K843 K844 K841S K842S 8435 K844S K911 K912 K913 K914 K921 K922 K923 K924 K931 Agilent P N 2110 0043 0490 1896 0490 1954 Description FUSE 1 5A 250V NTD FE Littelfuse UL LST RELAY 2C 3VDC COIL 2A 30VDC RELAY 2C 12VDC COIL Omron 2A 250VAC Vendor P N 031201 5 Vendor Omron G6SU 2 DC3 G6S 2 DC12 34922A Replaceable Parts A component locator is shown on page 137 Component Locator K601 K602 K603 K604 K605 K606 K607 K608 K609 K610 K611 K612 K613 K614 K615 K616 K617 K618 K619 K620 K621 K622 K623 K624 K625 K626 K627 K628 K629 K630 K631 K632 K633 K634 K635 K736 K737 K738 K739 K740 K741 K742 K743 K744 K745 K746 K747 K748 K749 K750 K751 K752 K753 K754 K755 K756 K757 K758 K759 K760 K761 K762 K763 K764 K765 K766 K767 K768 K769 K770 K811 K812 K813 K814 K821 K822 K823 K824 Agilent P N Description 0490 1896 2A 30VDC 0490 1954 RELAY2CI2VDC COIL Omron 2A 250VAC RELAY 2C 3VDC COIL Omron Vendor P N G6SU 2 DC3 Vendor G6S 2 DC12 34980A Service
27. A component locator is shown on page 146 Component Locator K501 K502 K503 K504 K505 K506 K507 K508 K509 K510 K511 K512 K513 K514 K515 K516 K517 K518 K519 K520 Agilent P N Description Vendor Vendor P N 0490 2731 RELAY 1A 9VDC COIL Matsushita 5A 30VDC THRU HOLE DSP1A L2 DC9V F 130 34980A Service Guide Replaceable Parts 6 34946A and 34947A Replaceable Parts There are no replaceable parts on these modules However they support only the following N1810 switch options Option 124 24 VDC coil options Option 201 D subminiature connectors Option 402 Position Indicators CAUTION If the proper N1810 voltage option Opt 124 is not used the switches could be damaged Vendor Addresses Agilent Technologies Inc 3501 Stevens Creek Blvd Santa Clara CA 95052 U S A Omron Electronics LLC 55 East Commerce Drive Schaumberg IL 60173 5302 U S A Coto Technology 55 DuPont Drive Providence RI 02907 U S A Matsushita c o Panasonic Electric Works Corporation of America 629 Central Avenue New Providence NJ 07974 U S A Littelfuse 800 East Northwest Highway Des Plains IL 60016 U S A 34980A Service Guide 131 6 Replaceable Parts 132 34980A Service Guide Agilent 34980A Multifunction Switch Measure Unit Service Guide e e Backdating ii Agilent Technologies 133 7 Backdating Backdating This chapter contains information necessary to adapt this
28. Bus relays channels 911 914 921 924 and 931 four on each bank that can connect the bank relays to the system Analog Buses and one that connects the current relays to the current input of the DMM Through ABusl and ABus2 you can connect any of the channels to the internal DMM for voltage or resistance measurements Refer to the simplified schematic below NOTE Bank Relays Armature latching A H H H H Analog Bus Relays Armature non latching mi G Current 34980A Service Guide Troubleshooting and Diagnostics 4 For the 34921A relay and fuse part numbers are given on page 126 and the component locator is shown on page 136 The table below shows the relationship of channel numbers to relay numbers Bank 1 Bank 2 Channel Relay Channel Relay 001 K601 021 K721 002 K602 022 K722 003 K603 023 K723 004 K604 024 K724 005 K605 025 K725 006 K606 026 K726 007 K607 027 K727 008 K608 028 K728 009 K609 029 K729 010 K610 030 K730 011 K611 031 K731 012 K612 032 K732 013 K613 033 K733 014 K614 034 K734 015 K615 035 K735 016 K616 036 K736 017 K617 037 K737 018 K618 038 K738 019 K619 039 K739 020 K620 040 K740 Backplane Backplane 911 K911 921 K921 912 K912 922 K922 913 K913 923 K923 914 K914 924 K924 Current Current 041 K841 8415 043 K843 K843S F1041 F1043 042 K842 K842S 044 K844 K844S F1042 F1044 Current Backplane 931 K931 T
29. Guide 34923A Replaceable Parts Replaceable Parts 6 A component locator is shown on page 138 Component Locator Agilent P N Description Vendor Vendor P N K401 K402 K403 K404 0490 2746 RLY DRY RD 1A 8 PC Coto 9000 0311 K405 K501 K502 K503 BUNDLE 0 5A 12V 300V K504 K505 K609 K611 K612 K613 0490 1954 RELAY2CI2VDC COIL Omron G6S 2 DC12 K614 K621 K622 K623 2A 250VAC K624 34924A Replaceable Parts A component locator is shown on page 139 Component Locator Agilent P N Description Vendor Vendor P N K401 K402 K403 K404 0490 2746 RLY DRY RD 1A 8 PC Coto 9000 0311 K405 K406 K407 K408 BUNDLE 0 5A 12V 300V K409 K501 K502 K503 K504 K505 K506 K507 K508 K509 K611 K612 K613 K614 0490 1954 RELAY 2C 12VDC COIL Omron G6S 2 DC12 K621 K622 K623 K624 2A 250VAC 34925A Replaceable Parts Component locators begin on page 140 Component Locator Agilent P N Description Vendor Vendor P N c J601 0602 1603 U604 J605 U606 U607 U608 J609 U610 U611 U612 J613 U614 U615 U616 J617 U618 U619 U620 701 U702 U703 U704 J705 U706 U707 U708 J709 U710 U711 U712 J713 U714 U715 U716 J717 U718 U719 U720 C K800 K801 K802 K803 K804 K805 K806 K807 1990 3295 SOLID STATE RELAY IF Matsushita AQW227NA 50mA MAX BVR 3V SMT 0490 1954 RELAY 2C 12VDC COIL Omron 2A 250VAC G6S 2 DC12 34980A Service Guide 127 6 Replaceable Parts 3
30. K8506 K8507 K8508 K8509 K8510 K8511 K8512 K8513 K8514 K8515 K8516 K8601 K8602 K8603 K8604 K8605 K8606 K8607 K8608 K8609 K8610 K8611 K8612 K8613 K8614 K8615 K8616 K8701 K8702 K8703 K8704 K8705 K8706 K8707 K8708 K8709 K8710 K8711 K8712 K8713 K8714 K8715 K8716 K8801 K8802 K8803 K8804 K8805 K8806 K8807 K8808 K8809 K8810 K8811 K8812 K8813 K8814 K8815 K8816 K921 K922 K923 K924 0490 1954 RELAY 2C 12VDC COIL Omron G6S 2 DC12 2A 250VAC 34980A Service Guide 129 6 Replaceable Parts 34933A Replaceable Parts A component locator is shown on page 144 Component Locator K501 K502 K503 K504 K505 K506 K507 K508 K601 K602 K603 K604 K605 K606 K607 K608 K921 K922 K923 K924 Agilent P N 0490 2746 0490 1954 Description Vendor Vendor P N RLY DRY RD 1A 8 PC Coto 9000 0311 BUNDLE 0 5A 12V 300V RELAY 2C 12VDC COIL Omron G6S 2 DC12 2A 250VAC 34937A Replaceable Parts A component locator is shown on page 145 Component Locator K601 K602 K603 K604 K605 K606 K607 K608 K609 K610 K611 K612 K613 K614 K615 K616 K617 K618 K619 K620 K621 K622 K623 K624 K625 K626 K627 K628 K629 K630 K631 K632 Agilent P N 0490 1896 0490 2731 Description Vendor Vendor P N RELAY 2C 3VDC COIL Omron G6SU 2 DC3 2A 30VDC RELAY 1A 9VDC COIL Matsushita 5A 30VDC THRU HOLE DSP1A L2 D C9V F 34938A Replaceable Parts
31. Plug in Module Test Considerations For optimum performance all test procedures should comply with the following recommendations Assure that the calibration ambient temperature is stable and between 18 C and 28 C Ideally the calibration should be performed at 28 C 1 C Assure ambient relative humidity is less than 80 Install the plug in module and allow a 1 hour warm up period before verification or adjustment Use shielded twisted pair PTFE insulated cables to reduce settling and noise errors Keep the input cables as short as possible Remove all user wiring and connections from the plug in modules before verification or adjustment Use 4 wire Ohms measurement techniques for checking relay contact resistance Check directly at the terminals where possible 34980A Service Guide Calibration Procedures 3 34951A 4 Ch Isolated DAC Module Each isolated DAC output channel can be measured and adjusted using the internal DMM The Internal DMM is recommended because it compensates for ambient temperature The 34951A features auto calibration Upon receipt of the calibration command all channels on the DAC are adjusted using the internal DMM Additionally you may adjust ALL 34951A modules installed in the instrument with one command The adjustments require approximately one minute per module The 34951A 4 Ch Isolated DAC is intended to be adjusted frequently to compensate for changes in the module s environ
32. Version M for Windows NT support or version 14 0 for Windows 98 SE support 34980A Service Guide 35 68 2 mm 2 68 in BQOVSQOLSVSLSVSBSLVSQOLSQOVSQSLGVSL0L5858 o909090909696909080809090909089690909096 o95969090909090908090969090909690909096 O99998090808980808089898080898980808980 H OG5OoG95959595959595959595959595959595959 95909095959590950055050000090009090909090 9909090959590909005000000000000900090909 64 6 mm 2 54 in 500 OSOSOSOSOROBOSOSGOROROSOBOROBOSOSODOROSO 9590959596909595069095959090909590009590 59900909095009595060566050000005900059000 OSOSOGOSOSOSOSOGSOSOSOSOGOSOSOSOSOSOSOSO OSOSOSOSOSOSOSOSOSOSOSOSOSOSOSOSOSOSOSO SS OLSLSLSLSLSYSLOSSLSSSL8SSLSL58SL58S595 SSOGOSGSOSOSOSOSOGOSOSOGOSOSOGOSOSOSOSOSOS 98P9GPSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPSPS 2X 88 85 mm 3 50 in 128 8 mm 5 07 in M4 0 x 0 7 Thread 4 Places 22 4 mm 0 88 in 34980A Service Guide 2X 93 6 mm 3 68 in sore SLOT COVER 425 6 mm 16 76 in Imensions A SLOT COVER SLOT COVER A A SLOT COVER LJ 2
33. a value of 0 if the calibration is successful A returned value of 1 indicates a calibration failure Following the auto calibration procedure the DMM is left in its reset state DCV 34980A Service Guide 71 3 Calibration Procedures 34952A Multifunction Module The only calibration constants are for the two DAC outputs on the 34952A Multifunction Module These outputs can be measured using an external voltmeter or with a test fixture such as the one shown below using the internal DMM via the ABus connector on the instrument s rear panel DMM Source HI Pin 9 Pin 4 DMM Source LO lt gt L Channel 6 or Channel 7 34952A Verification Analog Output Verification Test This procedure is used to check the calibration of the analog outputs on the 34952A Multifunction Module Verification checks are performed only for those output values with unique calibration constants 1 Use the internal DMM to measure the output of each channel You will need to physically move the input connections on the 34952A module to channel 6 and then channel 7 2 For each analog output channel 6 and channel 7 set each output value in the table on the next page Compare measurement results to the appropriate test limits shown in the table Itis not necessary to test the voltage output at the full rated 10 mA load 72 34980A Service Guide Calibration Procedures 3 Output Voltage Quick Check Error from Nom
34. ac voltage gain calibration Never turn off the instrument during a Gain Adjustment This may cause calibration memory for the present function to be lost 34980A Service Guide 34980A Service Guide Valid Gain Adjustment Input Values Calibration Procedures Gain adjustment can be accomplished using the following input values Function Range DC VOLTS 100 mV to 100 V 300 V OHMS OHMS 4W 100Q to 10 MQ DC CURRENT 10mAtolA AC VOLTS 1 10 mV to 100 V 300 V AC CURRENT 1A FREQUENCY Any Valid Calibration Input Values 0 9 to 1 1 x Full Scale 250 V to 303 V 0 9 to 1 1 x Full Scale 0 9 to 1 1 x Full Scale 0 9 to 1 1 x Full Scale 95 V to 303 V 9 mA to 11 mA Any Input 100 mV rms 1 kHz 100 kHz 1 Valid frequencies are as follows 1 kHz 10 for the 1 kHz calibration 45 kHz 100 kHz for the 50 kHz calibration and 10 Hz 10 for the 10 Hz calibration 63 3 64 Calibration Procedures Gain Adjustment Procedure Adjustment for each function should be performed only in the order shown in the performance verification table The performance verification tables used for gain adjustments start on page 55 Review the DMM Test Considerations on page 53 and Gain Adjustment Considerations on page 61 sections before beginning this test Configuration DC functions 61 digits AC functions LF 3 HZ SLOW 1 Configure each function and range shown in the gain verification tables starting on p
35. and a low L Each crosspoint relay has a unique channel number representing the row and column that intersect to create the crosspoint For example channel 815 represents the crosspoint connection between row 3 and column 15 all columns consisting of two digits in this case the digits are 15 See the simplified schematic below Matrix 1 Col 1 Col 2 Col 3 Col 4 Col15 Col 16 Row 1 Row2 2 Row3 5 Row 4 NOTE Three digit channel numbers are derived from the intersection of the rows and columns columns having two digits The intersection shown here represents Channel 315 Row 3 Column 15 Matrix 2 Col 1 Col 2 Col 3 Col 4 Col15 Col 16 Analog Buses Row 5 Row 6 Row 7 Row 8 Matrix 1 and Matrix 2 are electrically separate from one another Matrix Relays Armature latching Analog Bus Relays Armature non latching 104 34980A Service Guide Troubleshooting and Diagnostics 4 For the 34932A relay part numbers are given on page 129 and the component locator is shown on page 143 The table below and on the next page shows the relationship of channel numbers to relay numbers Matrix 1 Matrix 2 Channel Relay Channel Relay 101 K7101 501 K8501 102 K7102 502 K8502 103 K7103 503 K8503 104 K7104 504 K8504 105 K7105 505 K8505 106 K7106 506 K8506 107 K7107 507 K8507 108 K7108 508 K8508 109 K7109 509 K8509 110 K7110 510 K8510 111 K7111 511 K8511 112 K7112 512 K8512 11
36. contact an Agilent Service Center If all tests pass you have a high confidence 90 that the instrument is operational You can initiate a more complete self test by sending the TST command to the instrument This command returns a 0 if all the self tests pass or a 1 if a failure occurred Depending upon the number and type of modules installed this command may take up to 2 minutes to complete You may need to set an appropriate interface time out value 50 34980A Service Guide 34980A Service Guide Calibration Procedures 3 Quick Performance Check The quick performance check is a combination of internal self test and an abbreviated performance test specified by the letter Q in the performance verification tests This test provides a simple method to achieve high confidence in the instrument s ability to functionally operate and meet specifications These tests represent the absolute minimum set of performance checks recommended following any service activity Auditing the instrument s performance for the quick check points designated by a Q verifies performance for normal accuracy drift mechanisms This test does not check for abnormal component failures To perform the quick performance check do the following Perform a self test as described on page 50 Perform only the performance verification tests indicated with the letter Q If the instrument fails the quick performance c
37. further information on programming the instrument see Chapter 2 in the 34980A User s Guide For information about errors that may occur during the calibration procedure see Calibration Errors on page 86 45 3 46 Calibration Procedures Recommended Test Equipment The test equipment recommended for the performance verification and adjustment procedures is listed below If the exact instrument is not available substitute calibration standards of equivalent accuracy A suggested alternate method would be to use the Agilent 3458A 8 digit Digital Multimeter to measure less accurate yet stable sources The output value measured from the source can be entered into the instrument as the target calibration value Application Zero Calibration DC Voltage DC Current Resistance AC Voltage AC Current Frequency Analog Output 34951A Analog Output 34952A Thermocouple Reference Junction 34921A with 34921T Only Relay contact resistance 1 switch modules Recommended Equipment None Fluke 5700A Fluke 5700A 5725A Fluke 5700A Fluke 5700A 5725A Fluke 5700A 5725A Agilent 33220A Internal DMM Internal DMM J Type Calibrated Thermocouple Triple Point Cell Agilent Y1131A Accuracy Requirements 4 terminal all copper short 1 5 instrument 24 hour spec 1 5 instrument 24 hour spec 1 5 instrument 24 hour spec 1 5 instrument 24 hour spec 1 5 instrument 24 hour spec 1 5 instrument 24 ho
38. o gt N JA N m ee ele ls S elle eS Iz RIS SIS S ra a p 4 a raa a i4 4 a a a x 0e ce a C600 C700 C701 C703 A amp 9 o 5 P901 ci ES P902 34980A Service Guide Diagrams 8 34925A Component Locator Bottom 290 01 ceg2 C C195 ea CR300 RF CR1001 C1012 R100 C1005 1002 e M e e Sn g c m N o x gt exo E S29 o o eO w M 75 o p 0005 95 Go amp T2 oo c pp o Q eoo EM ge x jam c 0325 C322 C321 C320 C318 24 O ESL Oo Ez ps Lp Hd C315 0512 C311 C310 C308 C314 U502 U503 U500 0405 0404 0402 SER802OCR8O0 RP504 RP506 RP500 8 048 jn RP408 RP406 RP402 C319 26 C323 C517 C516 79 6309 c507 nnn ann ono oon I 0504 0501 0807 0805 0801 0803 0403 0401 RIO22 RP508 RP502 RP404 RP400 1023 o o mv oo o o p 4 NaN g no MAM Foo MAN ZO 14 MAM Fone 1515 1515 115 1515 EIE felis Lele ce Uee He He eUe He Ue xH ote Uy Iy crudo Hee O G 0 O0 G G O G G G G O O S 9 5 5 fe
39. panel you can control each of the FET channel switches individually and configure this module for differential 2 wire or 4 wire or single ended 1 wire mode Refer to the simplified 2 4 wire schematic below NOTE The three digit number assigned to each switch represents the channel number NOTE Bank relays FET non latching Analog Bus relays Armature non latching o L Overvoltage Protection each channel 10022 51 10 Tio 112 Current Limiting Circuitry 34980A Service Guide 34980A Service Guide Troubleshooting and Diagnostics For the 34925A FET part numbers are given on page 127 and the component locator is shown on page 140 The table below shows the relationship of channel numbers to relay numbers 4 Bank 1 Bank 2 2 4 Wire 1 wire FET 2 4 Wire 1 Wire FET Channel Channel Channel Channel 001 001 002 U601 021 041 042 U701 002 003 004 U602 022 043 044 U702 003 005 006 U603 023 045 046 U703 004 007 008 U604 024 047 048 U704 005 009 010 U605 025 049 050 U705 006 011 012 U606 026 051 052 U706 007 013 014 U607 027 053 054 U707 008 015 016 U608 028 055 056 U708 009 017 018 U609 029 057 058 U709 010 019 020 U610 030 059 060 U710 011 021 022 U611 031 061 062 U711 012 023 024 U612 032 063 064 U712 013 025 026 U613 033 065 066 U713 014 027 028 U614 034 067 068 U714 015 029 030 U615 035 069 070 U715 016 031 032 U616
40. range on all ranges except 300VDC and AC ranges and 1 ADC and AC current ranges For sine wave input gt 5 of range For inputs from 1 to 5 of range and lt 50 kHz add 0 1 of range additional error For AC filter slow Typically 3096 of reading error at 1 MHz limited to 1 x 108 volt hertz Input gt 100 mV For 10 mV inputs multiply 96 of reading error x 10 For 1 second aperture 62 digits Specified only for inputs 10 mA For AC filter slow 34980A Service Guide 27 2 Specifications Additional Low Frequency Error for ACV ACI of reading Frequency AC Filter Slow AC Filter Medium AC Filter Fast 10 Hz 20 Hz 0 0 74 _ 20 Hz 40 Hz 0 0 22 _ 40 Hz 100 Hz 0 0 06 0 73 100 Hz 200 Hz 0 0 01 0 22 200 Hz 1 kHz 0 0 0 18 gt 1 kHz 0 0 0 Additional Error for Frequency Period of reading Aperture Digits Frequency 1second 0 1 seconds 0 01 seconds 6 digits 5 digits 4 digits 3 Hz 5 Hz 0 0 12 0 12 5Hz 10 Hz 0 0 17 0 17 10 Hz 40 Hz 0 0 2 0 2 40 Hz 100 Hz 0 0 06 0 21 100 Hz 300 Hz 0 0 03 0 21 300 Hz 1 kHz 0 0 01 0 07 gt 1 kHz 0 0 0 02 Temperature Specifications Temperature Type 1 year accuracy TIT 24 hour Extended rangel 1 year Temp accuracy Coefficient Thermocouple B 1100 to 1820 1 2 400 Cto 1100 C 18 C 0 03 34921A only includes E 150 C to 1000 10 C 200 Cto 150 C15 C 0 03 cold junction accuracy o
41. the 100 mV 1 V and 10 V ranges for the best dc voltage accuracy Use 4 wire ohms and enable offset compensation for the best resistance accuracy AC Voltage and AC Current Measurements Set the resolution to 6 digits Select the slow ac filter 3 Hz to 300 kHz Frequency and Period Measurements Set the resolution to 6 digits 34980A Service Guide 41 2 Specifications 42 34980A Service Guide Agilent 34980A Multifunction Switch Measure Unit Service Guide 3 Calibration Procedures Agilent Technologies Calibration Services 44 Calibration Interval 44 Adjustment is Recommended 44 Time Required for Calibration 45 Automating Calibration Procedures 45 Recommended Test Equipment 46 Calibration Security 47 Calibration Message 48 Calibration Count 48 Calibration Process 49 Aborting a Calibration in Progress 49 Performance Verification Tests 50 Input Connections 52 DMM Test Considerations 53 Internal DMM Verification Tests 53 Optional AC Performance Verification Tests 59 Internal DMM Adjustments 60 Gain Adjustment 61 Plug in Module Test Considerations 65 34951A 4 Ch Isolated DAC Module 66 34952A Multifunction Module 71 Relay Plug in Modules 73 Thermocouple Reference Junction 34921A Optional 75 XE Agilent Technologies 5 3 Calibration Procedures Calibration Procedures This manual contains procedures for verification of the instrument s performance and adjustment calibration Closed Cas
42. those functions and ranges with unique offset calibration constants Measurements are checked for each function and range as described in the procedure on the next page 34980A Service Guide Zero Offset Verification Procedure Calibration Procedures 1 Make sure you have read DMM Test Considerations on page 53 2 Short all the inputs on the input test connector see page 52 Leave the Current input open Connect the shorts as close to the input connector as possible 3 3 Select each function and range in the order shown in the table below Make a measurement and return the result Compare measurement results to the appropriate test limits shown in the table Input Function Open DC Current Open Open Short DC Volts Short Short Short Short Short 2 Wire Ohms 2 and 4 Wire Short Ohms Short Short Short Short Short Quick Range Check 10 mA 100 mA Q 1A 100 mV 1V 10 V Q 100 V 300 V 100 Q 1kQ 10 KQ Q 100 KQ 1 MO 10 MQ 100 MQ 24 hour uA 4 60 3 5 uV 6uV 40 uV 600 uV 6mV 3 5 mQ 6 50 mQ 500 mQ 100 1000 10 Error from Nominal 90 day 2 5 100 uA 4uV 7uV 50uV 600 uV 9mV t4mO 10 100 mQ 1 Q 100 1000 10 1 2 5 100 uA 4uV 7uV 50 600 uV 9 4 10 mQ 100 mQ 190 100 1000 10 1 Select 6 digit resolution 2 For 2 wire ohms using a
43. used under normal operating conditions Therefore the cycle count is not recorded and this command always returns 0 will not generate an error Although the count on the FET switches is not recorded you can read the actual cycle count on the mechanical Analog Bus relays On the RF Multiplexer modules 34941A 34942A the signal path to the COM terminal consists of both a channel relay and a bank relay For each bank the module stores the cycle count for each channel relay the bank relay and returns the greater of the two For example to determine the cycle count on Channel 11 the module recalls the count on Channel 11 the count on the Bank 1 relay and returns the greater of the two In addition the cycle count on the two channels within the same physical relay package will always be equal Therefore the cycle count for Channels 11 and 12 will always be equal 34980A Service Guide 34980A Service Guide Calibration Procedures 3 Use the DIAGnostic RELay CYCLes lt ch_list gt command to read relay cycle counts on the following modules 34921A through 34925A Multiplexer Modules e 34931A through 34933A Matrix Modules e 34937A and 34938A GP Switch Modules 34941A and 34942A RF Multiplexer Modules e 34946A and 34947A Microwave Switch Modules Use the DIAGnostic DMM CYCLes 11213141516 command to read relay cycle counts for the internal DMM function and range relays By maintaining a count you can estimate
44. which relays are nearing the end of their useful life Relay Contact Resistance Verification Optional The Agilent Y1131A Verification Diagnostic Software Kit contains software and hardware used to test the relay switching modules available for the Agilent 34980A Multifunction Switch Measure Unit The software provides module specific tests to assist you with troubleshooting possible relay failures and predicting system maintenance requirements Custom terminal blocks are provided to route signals and isolate individual relays for verification and diagnostics For several of the relay switching modules it is very difficult to isolate a particular channel The Y1131A Verification Diagnostic Software used in conjunction with the provided verification terminal blocks attempts to isolate measurement channels in a repeatable manner 75 3 Calibration Procedures Thermocouple Reference Junction 34921A Optional You should perform these verification if you are using the module for thermocouple measurements To make a thermocouple measurement a known reference junction temperature measurement must be made The reference junction temperature is measured by two solid state temperature sensors in the input connection area on the module The adjustments store calibration constants used to correct the measurements from the temperature sensors Thermocouple measurements using an internal reference are only supported by the 34921A module using th
45. 07 4 108 Troubleshooting and Diagnostics 34933A Two Wire Mode Matrix 1 Col 1H Col 1L Col 2H Col 2L Col 8H Col 8L C1L C2H C2L C8L C1H bypass C1L bypass C2H bypass C2L bypass C8H bypass C8L bypass o NOTE i z Matrix Relays Reed non latching H H H Analog Bus Relays Armature non latching H Row 1 1 NOTE Although columns are numbered the same on Matrix 1 and Matrix 2 they are electrically seperate from one another Row 2 L NOTE All series resistors shown are 100Q e Row 3 2 H e Row 4 L NOTE Three digit channel numbers are derived from the intersection of the rows and columns columns having two digits The intersectoin shown here represents Channel 308 Row 3 Column 8 Matrix 2 Col 1H Col 1L Col 2H Col 2L Col 8H Col 8L 2 C2L C8H C8L C1H bypass C1L bypass C2H bypass C2L bypass C8H bypass C8L bypass Q Q Analog Buses Row 5 Row 6 Row 7 Row 8 34980A Service Guide 34933A One Wire Mode Row 1 Row 2 Row 3 Row 4 NOTE Three digit channel numbers are derived from a specific matrix number and the intersection of rows and Matrix 1 102 1C8 1C2 bypass 1C8 bypass 1C1 1C1 bypass Row 1 Row 2 Row 3 Row 4 columns on that matrix The channel shown here is 132 Matrix 1 Row 3 Column 2 Row 1 Row 2 Row 3 Row 4 Row 1 Row 2 Row 3 Row 4
46. 1 Remove the power cable from the unit If attached remove the analog bus connector a If desired you may also remove the feet by lifting the tab on each foot and sliding the foot toward the rear of the instrument 2 Remove all plug in modules 3 Using a T 20 Torx driver loosen the five captive screws in the rear bezel and remove the bezel The metal cover will now slide otf 34980A Service Guide 115 5 Disassembly and Repair Power Supply Removal 1 Remove the two T20 Torx screws securing the power supply module 2 Swing the module out and disengage it from the sheet metal at the back Note For testing purposes you can stand the power supply on end and insert it into slots in the mainframe as shown 116 34980A Service Guide Disassembly and Repair 5 3 To completely remove the power supply unplug the main power input brown and blue and the green yellow ground wire from the power supply printed circuit board Unplug the fan power and dc power from the KOM pc board Power Supply Disassembly 1 To disassembly the power supply press the catch on the power supply shield and slide the shield to release it 34980A Service Guide 117 5 118 Disassembly and Repair KOMI Removal 1 Remove the power supply see the procedure on page 116 2 Disconnect the two ribbon cables on the top of the chassis 3 Use a 3 16 nut driver to remove the nuts holding the Ext Trig DB9 con
47. 119 Gate input 0v 5vy Bl System clock generator characteristics Frequency 20 MHz 10 Hz configurable divide by n 24 bits programmable on off Vout 1 66 V 5 v Accuracy 100 ppm Configurable by bank 2 Lower current drive at lower voltages B Maximum threshold setting of 3V 34980A Service Guide 2 21 2 Specifications 34951A 4 channel D A Converter Specifications and Characteristics General specifications Maximum update rate 200 kHz point to point Monotonic to 16 bits Isolation 80 VDC AC peak chan to chassis or chan to chan Synchronization Software commands or external trigger Internal external CLK accuracy 100 ppm AC accuracy Not specified DC voltage Amplitude 16 V up to 10 Resolution 16 bits 500 uV Amplitude accuracy DC 0 05 3 0 mV 90 days 5 C or CAL MOD 5 C Ripple and noise lt 2 mVrms 20 Hz to 250 kHz into 10 kQ load Settling time 40 uS full scale to full scale step single channel to rated accuracy Output impedance lt 1 Q with the load sensed DC current Range 20 mA Resolution 16 bit 630 nA Accuracy value amps temperature within 5 C of or CAL 90 day 0 09 5 0 uA Ripple and noise lt 2 uA ms 20 Hz to 250 kHz into 250 Q Compliance voltage 12 V Max open circuit voltage lt 22V 22
48. 1810UL for the 34947A The M9046A and M9047A requires N1810 Switch Options 124 24 volt coils 201 D submin 9 pin conn and 402 Position Indicators 34980A Service Guide 17 2 Specifications RF and Microwave Module Specifications and Characteristics continued Switching characteristics Max volts 1 Max current Max power W Offset voltage Initial channel resistance Volt Hertz limit DC to 3 GHz 34941A 34942A 30 V 30 V 0 5A 0 5A 10 w M 10 w M 10 uV 10 uV 10 10 2 x 1010 2 x 101 General characteristics Relay life Open Close time Connector type Analog bus backplane connection 300 000 at 30V 10mA load 100 000 at 10 W load RF SAmeas 18 ms 18 ms SMA No 300 000 at 30V 10mA load 100 000 at 10 W load RF SAmeas 18 ms 18 ms Mini 75 SMB No DC to 20 GHz 12 34946A 7VDC N A 1W Q 7 VDC 50W peak 3 N A N A gt 5 M cycles 1M w drive 28 32VDC lt 15 ms 15 ms SMA No 34947A 7V DC N A 1W 7 VDC 50W peak 3 N A N A gt cycles 1 w drive 28 32VDC lt 15 ms 15 ms SMA No 1 Channel to earth 2 For more detailed specifications see the N1810TL for the 34946A and N1810UL for the 34947A The M9046A and M9047A requires N1810 Switch Options 124 24 volt coils 201 D submin 9 pin conn and 402 Position Indicators 3110 usec maximum duration 4 Max power is 1 W between 30 MHz and 1 GHz for CISPR 11 compliance
49. 23 C 5 C temperature range specified apply an additional temperature coefficient error For dc voltage dc current and resistance measurements you may need to apply an additional reading speed error For ac voltage and ac current measurements you may need to apply an additional low frequency error or crest factor error Understanding the of reading Error reading error compensates for inaccuracies that result from the function and range you select as well as the input signal level The reading error varies according to the input level on the selected range This error is expressed in percent of reading The following table shows the reading error applied to the internal DMM s 24 hour dc voltage specification Range Input Level Reading Error Reading Error of reading Voltage 10 Vdc 10 Vdc 0 0015 150 uV 10 Vdc 1 Vdc 0 0015 lt 15uV 10 Vdc 0 1 Vdc 0 0015 lt 1 5 uV 34980A Service Guide 37 2 38 Specifications Understanding the of range Error The range error compensates for inaccuracies that result from the function and range you select The range error contributes a constant error expressed as a percent of range independent of the input signal level The following table shows the range error applied to the DMM s 24 hour dc voltage specification Range Input Level Range Error Range Error voltage of range 10 Vdc 10 Vdc 0 0004 40 uV 10 Vdc 1 Vdc 0 0004 lt 40 uV 10 V
50. 3 K7113 513 K8513 114 K7114 514 K8514 115 K7115 515 K8515 116 K7116 516 K8516 201 K7201 601 K8601 202 K7202 602 K8602 203 K7203 603 K8603 204 K7204 604 K8604 205 K7205 605 K8605 206 K7206 606 K8606 207 K7207 607 K8607 208 K7208 608 K8608 209 K7209 609 K8609 210 K7210 610 K8610 211 K7211 611 K8611 212 K7212 612 K8612 213 K7213 613 K8613 214 K7214 614 K8614 215 K7215 615 K8615 216 K7216 616 K8616 34980A Service Guide 105 4 Troubleshooting and Diagnostics Matrix 1 Matrix 2 Channel Relay Channel Relay 301 K7301 701 K8701 302 K7302 702 K8702 303 K7303 703 K8703 304 K7304 704 K8704 305 K7305 705 K8705 306 K7306 706 K8706 307 K7307 707 K8707 308 K7308 708 K8708 309 K7309 709 K8709 310 K7310 710 K8710 311 K7311 711 K8711 312 K7312 712 K8712 313 K7313 713 K8713 314 K7314 714 K8714 315 K7315 715 K8715 316 K7316 716 K8716 401 K7401 801 K8801 402 K7402 802 K8802 403 K7403 803 K8803 404 K7404 804 K8804 405 K7405 805 K8805 406 K7406 806 K8806 407 K7407 807 K8807 408 K7408 808 K8808 409 K7409 809 K8809 410 K7410 810 K8810 411 K7411 811 K8811 412 K7412 812 K8812 413 K7413 813 K8813 414 K7414 814 K8814 415 K7415 815 K8815 416 K7416 816 K8816 Backplane 921 K921 922 K922 923 K923 924 K924 106 34980A Service Guide Troubleshooting and Diagnostics 4 34933A Dual Quad 4x8 Reed Matrix 34980A Service Guide Using program commands or the front panel of the 34980A you can configure the 34933A dual quad 4x8 ree
51. 325 425 K604 206 126 226 K503 606 326 426 K603 207 127 227 K502 607 327 427 K602 208 128 228 K501 608 328 428 K601 301 131 231 K505 701 331 431 K605 302 132 232 K508 702 332 432 K608 303 133 233 K507 703 333 433 K607 304 134 234 K506 704 334 434 K606 305 135 235 K504 705 335 435 K604 306 136 236 K503 706 336 436 K603 307 137 237 K502 707 337 437 K602 308 138 238 K501 708 338 438 K601 401 141 241 K505 801 341 441 K605 402 142 242 K508 802 342 442 K608 403 143 243 K507 803 343 443 K607 404 144 244 K506 804 344 444 K606 405 145 245 K504 805 345 445 K604 406 146 246 K503 806 346 446 K603 407 147 247 K502 807 347 447 K602 408 148 248 K501 808 348 448 K601 Backplane 92 K704 922 K703 923 K702 924 K701 34980A Service Guide 34937A 32 Channel GP Switch 34980A Service Guide The 34937A general purpose switch module provides independent control of Troubleshooting and Diagnostics Twenty eight Form C DPST latching relays rated at 1 A Four Form A SPST latching relays rated at 5 A A simplified schematic is shown below NB e Channel 029 5A Form A COM NC NO o COM NC NO o COM For the 349374 relay part numbers are given on page 130 and the component locator is shown on page 145 The table below shows the Channel 001 1A Form C Channel 028 1A Form C NO o COM Channel 032 5A Form A relationship of channel numbers to relay numbers
52. 34 and 34924A 12 34980A Service Guide Specifications 2 Multiplexer Module Specifications and Characteristics continued 34921A 34922A 34923A 34924A 34925A AC characteristics Bandwidth at terminal block 11 45 MHz 25 MHz 45 MHz 4 MHz 25 MHz 1 4 1 MHz 10 MHz 1 wire MHzll Crosstalk at terminal block ch ch 1 300 kHz 75 dB 75 dB 75 dB 75 dB N A 1 MHz 75 dB 75 dB 75 dB 70 dB 20 MHz 50 dB 50 dB 50 dB 45 dB 45 MHz 40 dB 40 dB Capacitance at terminal block 150 pF 250 pF 130 pF 200 pF 100 pF HI LO 150 pF 200 pF 120 pF 170 pF 300 pF LO earth 600 pF 1 wire General characteristics Relay life typical No load 100 M 100 M 1000 M 1000 M Unlimited 10 V 100 mA 10M 10M 10M 10M Unlimited Rated load 100 k 100 k 10 k 10 k Unlimited Scanning speeds 3 100 ch sec 100 ch sec 500 ch sec 500 ch sec 1000 ch sec Open close time typical 4 ms 4 ms 4 ms 4 ms 0 5 ms 0 5 ms 0 5 ms 0 5 ms 0 25 ms 0 25 ms Analog bus backplane Yes Yes Yes Yes Yes connection 11 50 Q source 50 Q load differential measurements verified with 4 port network analyzer Sdd21 2 With in rush resistors bypassed Bypassing resistors reduces lifetime of relays See the rated load relay life characteristics 3 Speeds are for 4 digits delay 0 display off autozero off and within bank 4 With 100 Q input protection resistors 34980A Service Guide 13 2 Specifications Matrix Modules Specifications and Characteristics
53. 34980A Service Guide Specifications 2 34951A 4 channel D A Converter Specifications and Characteristics continued Phase locking 1 0 trigger characteristics Trigger input Input level TTL compatible 3 3 V logic 5 V tolerant Slope Rising or falling selectable Pulse width gt 100 nS Input impedance gt 10 kQ DC coupled Trigger output Level TTL compatible into 1 kQ 3 3 V logic Output impedance 50 Q typical Clock input Input level TTL compatible 3 3 V logic 5 V tolerant Input impedance gt 10 DC Maximum rate 10 MHz Clock output Level TTL compatible into 1 kQ 3 3 V logic Output impedance 50 typical Maximum rate 10 MHz Accuracy 100 ppm 34980A Service Guide 23 2 Specifications 34952A Multifunction Module Specifications and Characteristics Digital input output characteristics Four 8 bits channels 8 bits wide input or output non isolated Vin L lt 0 8 V TTL Vin H 2 0 V TIL Vout L lt 0 8 V lout 400 mA Vout H gt 2 4 V lout 1 mA Vin H max lt 42 V with external open drain pull up Alarm Maskable pattern match or state change Speed 4 ms max alarm sampling Latency 5 ms typical to 34980A alarm output Read write speed 95 s Totalize input characteristics Max count 228 _1 Totalize input 100 kHz max rising or falling edge programmable Signal l
54. 4931A Replaceable Parts A component locator is shown on page 142 Component Locator Agilent P N Description Vendor Vendor P N K7101 K7102 K7103 0490 1896 RELAY 2C3VDC COIL Omron G6SU 2 DC3 K7104 K7105 K7106 2A 30VDC K7107 K7108 K7201 K7202 K7203 K7204 K7205 K7206 K7207 K7208 K7301 K7302 K7303 K7304 K7305 K7306 K7307 K7308 K7401 K7402 K7403 K7404 K7405 K7406 K7407 K7408 K8501 K8502 K8503 K8504 K8505 K8506 K8507 K8508 K8601 K8602 K8603 K8604 K8605 K8606 K8607 K8608 K8701 K8702 K8703 K8704 K8705 K8706 K8707 K8708 K8801 K8802 K8803 K8804 K8805 K8806 K8807 K8808 K921 K922 K923 K924 0490 1954 RELAY 2C I2VDC COIL Omron G6S 2 DC12 2A 250VAC 128 34980A Service Guide Replaceable Parts 6 34932A Replaceable Parts A component locator is shown on page 143 Component Locator Agilent P N Description Vendor Vendor P N K7101 K7102 K7103 0490 1896 RELAY 2C 3VDC COIL Omron G6SU 2 DC3 K7104 K7105 K7106 2A 30VDC K7107 K7108 K7109 K7110 K7111 K7112 K7113 K7114 K7115 K7116 K7201 K7202 K7203 K7204 K7205 K7206 K7207 K7208 K7209 K7210 K7211 K7212 K7213 K7214 K7215 K7216 K7301 K7302 K7303 K7304 K7305 K7306 K7307 K7308 K7309 K7310 K7311 K7312 K7313 K7314 K7315 K7316 K7401 K7402 K7403 K7404 K7405 K7406 K7407 K7408 K7409 K7410 K7411 K7412 K7413 K7414 K7415 K7416 K8501 K8502 K8503 K8504 K8505
55. 5 50kHz 100kHz 0 55 0 08 0 60 0 08 0 60 0 08 0 060 0 008 100kHz 300kHz I6 4 00 0 50 4 00 0 50 4 00 0 50 0 20 0 02 300 0000 V 3Hz 5Hz 1 00 0 05 1 00 0 08 1 00 0 08 0 100 0 008 5Hz 10Hz 0 35 0 05 0 35 0 08 0 35 0 08 0 035 0 008 10Hz 20kHz 0 04 0 05 0 05 0 08 0 06 0 08 0 005 0 008 20kHz 50kHz 0 10 0 10 0 11 0 12 0 12 0 12 0 011 0 012 50kHz 100kHz 0 55 0 20 0 60 0 20 0 60 0 20 0 060 0 020 100kHz 300kHz 18 4 00 1 25 4 00 1 25 4 00 1 25 0 20 0 05 Frequency and 100mV 300V 2 5 2 0 10 0 10 0 10 0 005 period 7 5Hz 10Hz 0 05 0 05 0 05 0 005 10Hz 40Hz 0 03 0 03 0 03 0 001 40Hz 300kHz 0 006 0 01 0 01 0 001 True RMS 10 00000 3Hz 5Hz 1 00 0 04 1 00 0 04 1 00 0 04 0 100 0 006 current and 1 0A 5Hz 10Hz 0 30 0 04 0 30 0 04 0 30 0 04 0 035 0 006 34921A only 10Hz 5kHz 0 10 0 04 0 10 0 04 0 10 0 04 0 015 0 006 100 0000 mA 8 3Hz 5Hz 1 00 4 0 5 1 00 4 0 5 1 00 4 0 5 0 100 0 006 5Hz 10Hz 0 30 0 5 0 30 0 5 0 30 0 5 0 035 0 006 10Hz 5kHz 0 10 0 5 0 10 0 5 0 10 0 5 0 015 0 006 One hour warm up and a fixed configuration with slow AC filter sine wave input and 6 2 digits Temperature within 5 C of temperature at calibration Tcal between 18 28 C 90 minute warm up and a fixed configuration and 61 2 digits Temperature within 1 C of temperature at calibration Tcal between 18 28 C Relative to calibration standards 20 over
56. 50 60 Hz 10 automatically sensed Power consumption 150 VA Operating environment Full accuracy for 0 C to 55 C Full accuracy to 80 R H at 40 C IEC 60664 1 pollution degree 1 Storage environment 40 C to 70 11 Mainframe dimensions 133H x 426W x 3410 mm 5 25 x 16 8 x 14 Full rack 3 units high Mainframe weight 8 8 kg 19 6 Ibs Module dimensions 280 x 170 x 27 mm 11 x 6 7 x 1 Safety Conforms to CSA UL IEC EN 61010 1 EMC Conforms to IEC EN 61326 1 CISPR 11 Warranty 1 year Software Agilent IO Libraries Suite 14 0 or greater E2094N connectivity software included Minimum system requirements IO libraries and drivers PC hardware Intel Pentium 100 MHz 64 Mbyte RAM 210 Mbyte disk space Display 800 x 600 256 colors CD Rom drive Operating system 2 Windows 98 SE NT 2000 XP Computer interfaces Standard LAN 10BaseT 100BaseTx Standard USB 2 0 IEEE 488 2 GPIB Software driver support for programming languages Software drivers IVI C and IVI COM for Windows NT 2000 XP LabVIEW Compatible with Agilent VEE Pro Agilent T amp M Toolkit requires Visual Studio NET National Instruments Test Stand Measurement Studio LabWindows CVI LabVIEW Switch Executive Microsoft Visual Studio NET C C Visual Basic 6 1 Storage at temperatures above 40 will decrease battery life 2 Load IO Libraries
57. 6 937 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 Troubleshooting and Diagnostics Description Trace of that name already exists Cannot delete active trace Digital channel not capable of specified width State of switch unknown No remote module present Remote module not powered Remote module topology change Channel drive is paired Remote module commands are unsupported on this slot Remote module is unable to perform requested operation Channel is not accessible Invalid missing remote module specifier Open operation not valid for this channel configuration Illegal operation when channel drive enabled Switch failed to verify as expected Internal channel drive illegal for remote slave module Overcurrent detected Remote modules configured in an illegal topology Illegal operation when remote module s channel drive disabled Module hardware unexpected transaction termination 4 89 4 90 Troubleshooting and Diagnostics Isolate a Problem with a Plug In Module Any module that fails the mainframe self test or generates a mainframe error must be replaced at the module level Only the relay and FET switches have field replaceable parts The following table summarizes the repair strategy for the plug in modules Model 34921A 34923A 34925A 34922A 34924A 34931A 34932A 34933A 34937A 34938A 34941A 34942A 34945A 34946A 34947A 34950A
58. 980A Service Guide 34980A Service Guide Calibration Procedures 3 Analog Output Verification Test This procedure is used to check the calibration of the analog outputs on the 34951A 4 channel DAC Module Verification checks are performed only for those output values with unique calibration constants 1 Using the input test connector described on page 67 leave the current input terminal open Set the DMM to the 100 mA range Make and record a current measurement This value will be used as an offset value during the output current zero verification 2 Make voltage measurement connections to channel 1 of the module 3 Set each output voltage value in the table below and make a measurement Compare measurement results to the appropriate test limits shown in the table It is not necessary to test the voltage output at the full rated 10 mA load If you test the output using a load connect the sense terminals 4 Make current measurement connections to channel 1 of the module Set the DMM to the 100 mA range 5 Set each output current value in the table below and make a measurement Compare measurement results to the appropriate test limits shown in the table When measuring the 0 mA output value apply the offset value from step 1 to the measured value 6 Repeat steps 2 through 5 for channels 2 3 and 4 7 Remove the input test connector 69 3 Calibration Procedures Output Voltage Quick Error from Check Nominal 90 day
59. A Service Guide Troubleshooting and Diagnostics 4 Bank 1 Bank 2 Channel Relay Channel Relay 001 K601 036 K736 002 K602 037 K737 003 K603 038 K738 004 K604 039 K739 005 K605 040 K740 006 K606 041 K741 007 K607 042 K742 008 K608 043 K743 009 K609 044 K744 010 K610 045 K745 O11 K611 046 K746 012 K612 047 K747 013 K613 048 K748 014 K614 049 K749 015 K615 050 K750 016 K616 051 K751 017 K617 052 K752 018 K618 053 K753 019 K619 054 K754 020 K620 055 K755 021 K621 056 K756 022 K622 057 K757 023 K623 058 K758 024 K624 059 K759 025 K625 060 K760 026 K626 061 K761 027 K627 062 K762 028 K628 063 K763 028 K629 064 K764 030 K630 065 K765 031 K631 066 K766 032 K632 067 K767 033 K633 068 K768 034 K634 069 K769 035 K635 070 K770 Backplane Backplane 911 K811 921 K821 912 K812 922 K822 913 K813 923 K823 914 K814 924 K824 34980A Service Guide 95 4 Troubleshooting and Diagnostics 34923A 40 80 Channel Reed Multiplexer The 34923A 40 80 Channel Reed Multiplexer 40 80 Ch Reed MUX is divided into two equal banks of non latching reed switches This module also contains eight armature Analog Bus relays channels 911 914 and 921 924 four on each bank that can connect the bank relays to the system Analog Buses You can connect any of the channels to the internal DMM through ABus1 and ABus2 for voltage or resistance measurements Using program commands or the mainframe front panel you can control each of the channel switches in
60. Disassembly and Repair Backplane Removal 1 Remove the front panel see the procedure on page 119 and the DMM see the procedure on page 121 2 Use a 3 16 nut driver to remove the rear panel Analog Bus DB9 connector Unclip the connector cable from the mainframe 3 Remove the five T20 Torx screws holding the backplane assembly to the chassis and lift the printed circuit assembly out 122 34980A Service Guide Agilent 34980A Multifunction Switch Measure Unit Service Guide 6 Replaceable Parts To Order Replaceable Parts 124 Backdating and Part Changes 124 Mainframe Replaceable Parts 125 34921A Replaceable Parts 126 34922A Replaceable Parts 126 34923A Replaceable Parts 127 34924A Replaceable Parts 127 34925A Replaceable Parts 127 34931A Replaceable Parts 128 34932A Replaceable Parts 129 34933A Replaceable Parts 130 34937A Replaceable Parts 130 34938A Replaceable Parts 130 34946A and 34947A Replaceable Parts 131 Vendor Addresses 131 RE Agilent Technologies 123 6 Replaceable Parts Replaceable Parts 124 This section contains information for ordering replacement parts for your instrument Parts are listed in alphanumeric order according to their reference designators The parts lists include a brief description of each part with applicable Agilent part number To Order Replaceable Parts You can order replaceable parts from Agilent using the Agilent part number Note that only field replaceable parts are li
61. Errata Agilent References in this manual NOTICE This document contains references to Agilent Technologies Agilent s former Test and Measurement business has become Keysight Technologies For more information go to www keysight com About this manual We ve added this manual to the Keysight website in an effort to help you support your product This manual provides the best information we could find It may be incomplete or contain dated information Support for your product You can find information about technical and professional services product support and equipment repair and service on the web www keysight com Select your country from the drop down menu at the top Under F ectronic Test and Measurement click on Services The web page that appears next has contact information specific to your country For more detailed product information go to www keysight com find product model i e for the M9514A use www keysight com find M9514A Hypertext links to documents on agilent com are no longer active Use this substitution to access PDF files Broken links have the form http cp literature agilent com litweb pdf lt ferature part number Substitute links with this form http literature cdn keysight com litweb pdf terature part number Where ferature part number has the form M9300 90001 pdf For service notes use www keysight com find servicenotes KEYSIGHT TECHNOLOGIES Agilent 34980A Mul
62. Guide 61 3 62 Calibration Procedures Gain Adjustment The Internal DMM stores a single new gain correction constant each time this procedure is followed The gain constant is computed from the calibration value entered for the calibration command and from measurements made automatically during the adjustment procedure Most measuring functions and ranges have gain adjustment procedures Only the 100 MO range does not have gain calibration procedures Adjustments for each function should be performed ONLY in the order shown in the performance verification table See Performance Verification Tests on page 50 for the tables used for gain adjustments Gain Adjustment Considerations The zero adjustment procedure must have been recently performed prior to beginning any gain adjustment procedures The optional 10 Vdc adjustment should be performed only after servicing the Internal DMM s a to d converter When performing a 4 wire ohms gain adjustment a new gain correction constant is also stored for the corresponding 2 wire ohms measurement range If desired the 2 wire gain can be adjusted separately after the 4 wire ohms gain calibration is completed If the 2 wire Ohms gain is adjusted separately the 2 wire Ohms function will not meet specifications when offset compensated Ohms is used During the ac voltage gain adjustments some of the dc voltage gain constants are used Perform the dc voltage gain calibration before the
63. IITIIIITIJ api Se in a Br ig ag ag ismi Cg i ig s Cag K748 A AWAY ANAH 3115 AIAISIASISISI AAW WANN SS RIN 2 a l Aegle elea B elo K752 x ANA NT 000000000000000000090 0000000000000000000 00000000000000000000 0000000000000000000 O 34980A Service Guide 137 8 Diagrams 34923A Component Locator 020
64. Init Open 3 7 4 1 4 7 34923A Open or Close 0 9 1 2 1 8 Read 2 9 3 3 4 7 Close Read Open 5 3 5 8 6 5 Init WAI 1 9 2 1 3 Close Init Open 4 2 4 7 5 2 34921A Open or Close 47 5 5 3 Read 2 9 3 3 4 7 Close Read Open 14 15 15 Init WAI 1 9 2 1 3 Close Init Open 124 14 14 1 Readings were made with minimum NPLC delay 0 display off autozero off 2 All times include the issue of READ and the retrieval of data 3 CLOSE or OPEN bus transfer times allowed to overlap previous command Command parse times overlap current activity until I O latency dominant 34980A Service Guide 29 Single Channel Measurement Rates DMM Reading Rates 1 2 Function Resolution Rdgs s DCV 4 1 2 digits 0 02 plc 3000 5 1 2 digits 1 plc 59 6 1 2 digits 10 plc 6 2 wire Resistance 4 1 2 digits 0 02 plc 2000 5 1 2 digits 1 plc 58 6 1 2 digits 10 plc 6 Thermocouple 0 02 plc 2000 0 1 C 1 plc 59 RTD Thermistor 1 C 0 02 plc 1900 0 1 C 1 plc 58 0 01 C 10 plc 6 ACV 6 1 2 fast 200 Hz 350 6 1 2 Med 20 Hz 350 6 1 2 slow 3 Hz 300 Frequency period 4 1 2 digits 10 ms 70 5 1 2 digits 100 ms 9 6 1 2 digits 1 s gate 1 1 Reading speeds for 60 Hz autozero OFF 2 For fixed function and range readings to memory scaling and alarms off autozero OFF Scanning Measurement Rates to Bus or Memory Direct Measurements direct to 1 0 Direct includes switch measure time and 1 0 time
65. Measurment to Memory Scanning Channels m GPIB USB 2 0 LAN w VXI 11 Into memory ch sec ch sec ch sec ch sec Scanning DCV or Ohms 34925A 920 860 980 1000 34923A 24A 588 572 605 625 34921A 22A 109 109 109 109 Scanning ACV 2 34925 318 315 323 318 34923 24 260 260 260 260 34921 22 88 88 88 88 Scanning Temperature 34921A 109 109 109 109 Scanning Digital in 34950A 660 592 815 1038 1 Speeds are for 4 digits delay 0 display off autozero off Scanning is within bank on the same module Add 10 ms for between banks or modules 2 Add additional time for filter setting on ACV 30 34980A Service Guide Specifications 2 Data Out of Memory to LAN USB or GPIB Data transfer rate with 1000 channel blocks XwYyACL GPIBB USB2 wxi n rdgs sec rdgs sec rdgs sec Readings 2560 2400 3542 Readings with Timestamp 1304 1230 1826 Readings with all Format Options 980 926 1361 ON 1 LAN large block throughput rate is increased by approximately 30 using LAN sockets Internal DMM Measurement Characteristics 34980A Service Guide DC voltage Measurement method Continuously integrating multi slope Ill A D converter A D linearity 0 0002 of reading 0 0001 of range on 10 V range Input resistance 100 mV 1 V 10 V ranges 100 V 300 V ranges Selectable 10 MQ or gt 10 000 10 MO 1 Input bias current Input Protection lt 50 pA at 25 C 300 V all ra
66. O gt 10 GO gt 10 GO gt 10 GO Leakage current 3 N A N A N A N A 20 nA I T C cold junction accuracy 3 8 1 C N A N A N A N A DC or AC RMS voltage channel to channel or channel to earth Peak voltage channel to channel or channel to earth Into analog bus System errors are included in the internal DMM measurement accuracy specifications With in rush resistors bypassed Bypassing resistors reduces lifetime of relays See the rated load relay life characteristics Limited to 6 W of channel resistance power loss per module DC or peak AC current Ambient temperature lt 30 C Includes 0 5 C temperature reference sensor and 0 5 C terminal block isothermal gradient error Measured under worst case loading of the mainframe See 34980A User s Guide for information on supported external reference sensors With 100 Q input protection resistors 10 Channel resistance is typically lt 1 5 but can be as high as 50 when a channel is used in measurement applications with 1 mA load current Increased relay channel resistance for measurements with load currents below 1 mA can occur on cards that have been out of service or following relay inactivity for periods of greater than 1 week Switching relays for 2k cycles prior to use typically corrects this problem Agilent recommends the use of 4 wire ohms for resistance measurements and the Hi Z input impedance configuration for voltage measurements Applies to 34921A 34922A 3492
67. R SLOT COVER D Se ums DIO pit O Access to Analog Buses shown with cover installed For pinout see page vi Module installed in slot 1 Slot identifier Module ground screw Slot cover over slot 2 AC power connector LAN connector 10Base T 100Base Tx USB 2 0 connector External trigger input For pinout see page vi USB gt ig Al GPIB o 9 12 Internal DMM option mark If you ordered the internal DMM option the circle is marked black IEEE 488 2 GPIB Connector Chassis ground screw 34980A Service Guide Rear Panel Connector Pinouts External Trigger Alarms Connector Male D Sub Input E 5V a gt Y OV o E i Ext Trig Input gt lt lt Chan Adv Input Pin 6 gt 1us gt E Gnd Pin 9 Output 3 3 V Chan Closed Output VM Comp Output Pin 5 0v Approx 2 us Alarm 1 Output Pin 1 Alarm 2 Output Pin 2 Alarm 3 Output Pin 3 Alarm 4 Output Pin 4 Gnd Pin 9 Ext Trig Alarms DIO Analog Bus Connector Female D Sub ANALOG BUSSES ABus1 HI Pin 9 iu Input I Pin 5 ABus2 HI Pin 8 ABus2 LO Pin 3 ABus3 HI Pin 7 ABus3 LO Pin 2 ABus4 HI Pin 6 ABus4 LO Pin 1 34980A Service Guide vi
68. SS Matrix 3 3C1 3C2 3C8 3C1 bypass 3C2 bypass 3C8 bypass o o o o o Q Matrix 4 4C1 4C2 4C8 4C1 bypass 4C2 bypass 4C8 bypass o o o o o E R L Ao Troubleshooting and Diagnostics 4 NOTE Although rows are numbered the same across the matrices they are electrically separate from one another NOTE Matrix Relays Reed non latching Analog Bus Relays Armature non latching NOTE All series resistors shown are 1000 Matrix 2 2C1 2 2 2 8 2C1 bypass 2C2L bypass 2C8 bypass Channel 218 Matrix 2 Row 1 Column 8 Analog Buses Row3_ Row 4 For the 34933A relay part numbers are given on page 130 and the component locator is shown on page 144 The table on the next page shows the relationship of channel numbers to relay numbers 34980A Service Guide 109 4 110 Troubleshooting and Diagnostics Matrix 1 Matrix 2 2 Wire 1 Wire Relay 2 Wire 1 Wire Relay Channel Channel Channel Channel 101 111 211 K505 501 311 411 K605 102 112 212 K508 502 312 412 K608 103 113 213 K507 503 313 413 K607 104 114 214 K506 504 314 414 K606 105 115 215 K504 505 315 415 K604 106 116 216 K503 506 316 416 K603 107 117 217 K502 507 317 417 K602 108 118 218 K501 508 318 418 K601 201 121 221 K505 601 321 421 K605 202 122 222 K508 602 322 422 K608 203 123 223 K507 603 323 423 K607 204 124 224 K506 604 324 424 K606 205 125 225 K504 605
69. a partial or 1 2 digit For example the internal DMM can measure 9 99999 Vdc on the 10 V range This represents six full digits of resolution The internal DMM can also overrange on the 10 V range and measure up to a maximum of 12 00000 Vdc This corresponds to a 6 digit measurement with 20 overrange capability Sensitivity Sensitivity is the minimum level that the instrument can detect for a given measurement Sensitivity defines the ability of the instrument to respond to small changes in the input level For example suppose you are monitoring a 1 mVdc signal and you want to adjust the level to within 1 uV To be able to respond to an adjustment this small this measurement would require a instrument with a sensitivity of at least pV You could use a 61 digit instrument if it has a 1 Vdc or smaller range You could also use 4 2 digit instrument with a 10 mVdc range For ac voltage and ac current measurements note that the smallest value that can be measured is different from the sensitivity For the internal DMM these functions are specified to measure down to 1 of the selected range For example the internal DMM can measure down to 1 mV on the 100 mV range Resolution Resolution is the numeric ratio of the maximum displayed value divided by the minimum displayed value on a selected range Resolution is often expressed in percent parts per million ppm counts or bits For example a 61 2 digit instrument w
70. age 55 2 Apply the input signal shown in the Input column of the appropriate verification table Always complete tests in the same order as shown in the appropriate verification table 3 Send the actual input value to the instrument using the CALibration VALue lt value gt command 4 Calibrate the instrument using the CALibration command 5 Perform the appropriate Gain Verification Test to check the calibration results 6 Repeat steps 1 through 5 for each gain verification test point shown in the tables Each range in the gain adjustment procedure takes less than 20 seconds to complete 34980A Service Guide Calibration Procedures 3 10 Vdc Adjustment Procedure Optional The 10 Vdc calibration electronically enhances the Internal DMM s a to d converter linearity characteristic This adjustment should ONLY be performed after servicing the A to D converter or replacement of the calibration RAM You will need an input test connector as described in Input Connections on page 52 1 If a zero calibration has not been performed recently perform one before beginning this procedure see page 60 2 Configure the instrument as follows DC VOLTS 10 V range SENSe VOLTage DC RANGe 10 6 digits INTEG 100 PLC SENSe VOLTage DC NPLC 100 INPUT R gt 10 G SENSe VOLTage DC IMP AUTO ON 3 Measure and note the voltage offset present at the end of the measurement cable by shorting the ends of
71. age Frequency Range 24 hour 90 day 1 year 10 1 100 Hz 100 mV 0 06Hz 01Hz 01Hz 1V 100 kHz 1V Q 6 Hz 10 Hz 10 Hz 1 Verify only No adjustment For this test isolate the calibrator s output from earth ground Q Quick performance verification test points 59 3 60 Calibration Procedures Optional AC Performance Verification Tests These tests are not intended to be performed with every calibration They are provided as an aid for verifying additional instrument specifications There are no adjustments for these tests they are provided for performance verification only Configuration AC Volts CONFigure VOLTage AC LF 3 HZ SLOW SENSe VOLTage AC BANDwidth 3 1 Make sure you have read DMM Test Considerations on page 53 2 Select the AC Volts function and the 3 Hz filter 3 Select each range in the order shown below Provide the input voltage and frequency indicated Compare measurement results to the appropriate test limits shown in the table below Be certain to allow for appropriate source settling Input Error from Nominal Voltage Frequenc Range 24 hour 90 day 1 year y 1V 20 Hz 1v 700uV x900uV ImV 1V 20 kHz 1V 700uV x900uV 1mV 1V 100 kHz 1v 63mV 68mV 6 8 1V 300 kHz 1V 45mV 45mV 45mV 10 V 1 kHz 10 V 7mV 9mV 10 mV 1V 1 kHz 10 V 34mV 45mV 46mV 100 mV 1 kHz 10 V 13mV 14mV 14mV 34980A Service Guide Calibration Procedures 3 Internal DMM Adjust
72. al electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE directive Annex 1 this product is classified as a Monitoring and Control instrumenta tion product To return unwanted products contact your local Agilent office or go to www agilent com environment product for more information Technical Support If you have questions about your ship ment or if you need information about warranty service or technical support contact Agilent Technologies In the United States 800 829 4444 In Europe 31 20 547 2111 In Japan 0120 421 345 Or go to www agilent com find assist for information on contacting Agilent in your country of specific location You can also contact your Agilent Technologies Representative Front Panel at a Glance ad 7 grim 2 KE Cee 6 GO C9 G cen 7 SHE Antone Technologies 232894 snes ine 3 amp O oo 8222 gD s 2 2 9090 09 1 amp GO OO CO CG G Measure Configure n gt 1 On Standby switch ZU This switch is standby only To disconnect the mains from the instrument remove the power cord 2 Utility menu contains settings for Remote I O LAN GPIB and USB Date and Time and other system related instrument parame
73. asuring Not a scannable channel Not able to accept unit names longer than 3 characters Not able to accept character in unit name Not able to perform on more than one channel Not able to recall state it is empty Not able to recall state DMM enable changed 83 4 Troubleshooting and Diagnostics Error Description 301 Module currently committed to scan 302 No module was detected in this slot 303 Module is not able to perform requested operation 304 Does not exist 305 Not able to perform requested operation 306 Part of a 4 wire pair 307 Incorrectly configured ref channel 308 Channel not able to perform requested operation 309 Incorrectly formatted channel list 310 Operation refused because channel is locked open 311 Not able to specify resolution with Auto range 501 Isolator UART framing error 502 Isolator UART overrun error 514 Not allowed 514 Not allowed Instrument locked by another I O session 521 Communications input buffer overflow 521 Input buffer overflow 522 Output buffer overflow 522 Communications output buffer overflow 531 Insufficient memory 532 Cannot achieve requested resolution 532 Not able to achieve requested resolution 540 Cannot use overload as math reference 540 Not able to null channel in overload 550 Command not allowed in local 550 Not able to execute command in local mode 551 Unknown Dmm Inguard Error 84 34980A Servic
74. ay numbers Bank 1 Bank 2 Channel Relay Channel Relay 001 K401 036 K501 002 K403 037 K503 003 K404 038 K504 004 K408 039 K508 005 K408 040 K508 006 K402 041 K502 007 K403 042 K503 008 K404 043 K504 009 K409 044 K509 010 K407 045 K507 011 K401 046 K501 012 K404 047 K505 013 K404 048 K504 014 K408 049 K508 015 K408 050 K508 016 K402 051 K502 017 K403 052 K503 018 K404 053 K505 019 K409 054 K509 020 K407 055 K507 021 K401 056 K501 022 K403 057 K503 023 K404 058 K504 024 K409 059 K509 025 K407 060 K507 026 K402 061 K502 027 K404 062 K505 028 K406 063 K506 028 K407 064 K507 030 K409 065 K509 031 K402 066 K502 032 K401 067 K501 033 K404 068 K505 034 K406 069 K506 035 K406 070 K506 Backplane Backplane 911 K611 921 K621 912 K612 922 K622 913 K613 923 K623 914 K614 924 K624 34980A Service Guide 99 4 100 Troubleshooting and Diagnostics 34925A 40 80 Channel Optically Isolated FET Multiplexer The 34925A 40 80 Channel Optically Isolated FET Multiplexer 40 80 Ch FET MUX module is a high speed and high density FET MUX for high throughput production test This module is divided into two equal banks of non latching FET switches This module also contains four armature Analog Bus relays Through ABus1 and ABus2 you can connect any of the channels to the internal DMM for voltage or resistance measurements When the power is off all channel and Analog Bus relays open Using program commands or the mainframe front
75. cedures Relay Plug in Modules There are two methods you can use to verify relays Read the relay cycle count Measure the relay contact resistance Relay Cycle Count The instrument has a Relay Maintenance System to help you predict relay end of life The instrument counts the cycles on each relay in the instrument and stores the total count in non volatile memory on each switch module You can use this feature on any of the relay modules and the internal DMM 74 In addition to the channel relays you can also query the count on backplane relays and bank relays Note that you cannot control the state of these relays from the front panel but you can query the count You can also query the state of the six relays on the internal DMM These relays open or close when a function or range is changed on a module You can reset the count but the instrument must be unsecured see Calibration Security on page 47 to unsecure the instrument The 34923A 34924A and 34933A modules can be configured for 2 wire differential or 1 wire single ended measurements Since two coils are required to drive each channel relay in the 2 wire mode the module stores the cycle count for each coil and returns the greater of the two To determine the cycle count for each coil reconfigure the module for the 1 wire mode a power cycle is required and query the count The FET switches on the 34925A FET Multiplexer module have an infinite life when
76. cements become available you can easily update your mainframe and plug in module firmware to ensure optimum compatibility The latest firmware updates are available from the Agilent 34980A product page at www agilent com find 34980AUpdates Front Panel Operation Utility gt FIRMWARE gt UPDATE Once you have downloaded the latest mainframe firmware see above use the knob to scroll through the installed modules that require a firmware update To exit the menu without installing the updates select CANCEL 34980A Service Guide 79 4 80 Troubleshooting and Diagnostics Instrument Errors A record of up to 20 errors can be stored in the instrument s error queue Each remote interface I O session i e GPIB USB LAN etc has its own interface specific error queue Errors appear in the error queue of the I O session that caused the error For example if an error was generated by a command sent over the GPIB interface send this command from GPIB to read the error queue The instrument beeps once each time a command syntax or hardware error is generated The front panel ERROR annunciator turns on when one or more errors are currently stored in the error queue A special global error queue holds all power on and hardware related errors e g over temperature Safety Interlock etc Errors are retrieved in first in first out FIFO order The first error returned is the first error that was stored Once you have read all of
77. channel to channel or channel to earth 2 Limited to 6 W of channel resistance power loss per module BI 50 Q source 50 Q load differential measurements verified S21 16 34980A Service Guide Specifications 2 RF and Microwave Module Specifications and Characteristics DC to 3 GHz DC to 20 GHz 121 34941A 34942A 34946A 34947A Channels quad 1x4 quad 1x4 2 SPDT 3 SPDT Switch type 50 unterminated 75 Q unterminated 50 terminated 50 Q unterminated RF characteristics latching relays latching relays Frequency range l l pCto3 GHz DC to 1 5 GHz DC to 4 GHz DC to 4 GHz or or DC to 20 GHz DC to 20 GHz Insertion loss DC to 4 GHz lt 0 42 dB DC to 4 GHz lt 0 42 dB lt 40 C 80 RH 1 20GHz lt 069dB 20 GHz lt 0 69 dB 100 MHz 0 15 dB 0 15 dB 1 GHz 0 60 dB 0 60 dB 3 GHz 1 40 dB N A VSWR DC to 4 GHz 1 15 DC to 4 GHz 1 15 20 GHz lt 1 30 9 20 GHz lt 1 30 100 MHz 1 03 1 15 1 GHz 1 25 1 35 3 GHz 1 55 N A Isolation dB Contact Factory Contact Factory DC to 4 GHz gt 85 dB 9 20 GHz 67 dB DC to 4 GHz gt 85 dB 9 20 GHz 67 dB 100 MHz 80 dB 80 dB 1 GHz 58 dB 60 dB 3 GHz 40 dB N A Spurious noise below 1 3 GHz 140 dBm 140 dBm 80 dB 80 dB Risetime 80 ps 160 ps N A N A Signal delay 1 ns 1ns N A N A Capacitance 30 pF 30 pf N A N A 1 50 Q source 50 Q load 75 Q for 34942A 2 For more detailed specifications see the N1810TL for the 34946A and N
78. ctor Connector pinout is shown in the figure on page 52 Use shielded twisted pair PTFE insulated cables to reduce settling and noise errors Keep the input cables as short as possible Connect the input cable shield to the source LO output Except where noted in the procedures connect the calibrator LO source to earth ground Either remove all modules from the mainframe or reset the modules to ensure no module is connected to the backplane ABus Because the instrument is capable of making highly accurate measurements you must take special care to ensure that the calibration standards and test procedures used do not introduce additional errors Ideally the standards used to verify and adjust the instrument should be an order of magnitude more accurate than each instrument range full scale error specification For the dc voltage dc current and resistance gain verification measurements you should take care to ensure the calibrator s 0 output is correct If necessary the measurements can be referenced to the calibrator s 0 output using Mx B scaling see Chapter 2 in the 34980A User s Guide You will need to set the offset for each range of the measuring function being verified 34980A Service Guide 53 3 54 Calibration Procedures Internal DMM Verification Tests Zero Offset Verification This procedure is used to check the zero offset performance of the internal DMM Verification checks are only performed for
79. d matrix module for differential 2 wire mode or single ended 1 wire mode The 34933A module contains 100 in rush resistors that are used to protect the reed relays from reactive loads If you have applications where in rush resistors interfere with measurements connections are provided on the terminal blocks for you to bypass the in rush resistors that are located on the columns Two Wire Mode In 2 wire mode the 34933A module contains two matrices each with 32 2 wire crosspoint non latching reed relays organized in a 4 row by 8 column configuration Every row and column are made up of two wires each a high H and a low L Each crosspoint relay has a unique channel number representing the row and column that intersect to create the crosspoint For example channel 308 represents the crosspoint connection between row 3 and column 08 all columns consisting of two digits in this case the digits are 08 See the simplified schematic on page 108 One Wire Mode In 1 wire mode the 34933A module contains four matrices 1 through 4 each with 32 1 wire crosspoint non latching reed relays organized in a 4 row by 8 column configuration Every row and column has one wire each Each crosspoint relay has a unique channel number representing the matrix and the single wire row and column that intersect to make the crosspoint For example channel 218 represents Matrix 2 row 1 and column 8 See the simplified schematic on page 109 1
80. dc 0 1 Vdc 0 0004 lt 40 uV Total Measurement Error To compute the total measurement error add the reading error and range error You can then convert the total measurement error to a percent of input error or a ppm part per million of input error as shown below Total Measurement Error a gr H ERR 1 of input error Input Signal Level x 100 Total Measurement Error f input NE E Input Signal Level x 1 000 000 Example Computing Total Measurement Error Assume that a 5 Vdc signal is input to the DMM on the 10 Vdc range To compute the total measurement error using the 90 day accuracy specification of 0 0020 of reading 0 0005 of range Reading Error 0 0020 x 5 Vde 100 uV Range error 0 000596 x 10 Vdc 50 uV Total Error 100 uV 50 uV t150uV 0 0030 of 5 Vdc 30 ppm of 5 Vdc 34980A Service Guide Specifications 2 Interpreting Internal DMM Specifications This section is provided to give you a better understanding of the terminology used and will help you interpret the internal DMM s specifications Number of Digits and Overrange The number of digits specification is the most fundamental and sometimes the most confusing characteristic of a instrument The number of digits is equal to the maximum number of 9 s the instrument can measure or display This indicates the number of full digits Most instruments have the ability to overrange and add
81. ding conduc tor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury Do Not Operate in an Explosive Atmosphere Do not operate the instrument in the pres ence of flammable gases or fumes Do Not Remove the Instrument Cover Only qualified service trained personal who are aware of the hazards involved should remove instrument covers Always disconnect the power cable and any exter nal circuits before removing the instru ment cover Do Not Modify the Instrument Do not install substitute parts or perform any unauthorized modification to the product Return the product to an Agilent Sales and Service Office for service and repair to ensure that safety features are maintained In Case of Damage Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified ser vice personnel Safety Symbols Alternating current d Frame or chassis terminal Standby supply Unit is not completely disconnected from ac mains when switch is off Caution risk of electric shock Caution refer to accompanying O AN N Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC This product complies with the WEEE Directive 2002 96 EC marking require ment The affixed product label see above indicates that you must not dis card this electric
82. dividually and configure this module for differential 2 wire or 4 wire single ended 1 wire mode Refer to the simplified schematic for two or four wire modes Bank 1 NOTE 7 Bank Relays Reed non latching ak gt 001 006 011 016 Analog Bus Relays Armature L eode L EC L E i non latching 002 L 007 012 o 05 25 008 013 2 s o mi 1 j 009 014 019 L5 H I hV y 1000 1000 008 Lt 010 015 2 ia T H L H H L H L 1000 pE f pP Te 912 1002 VE lj mies 1000 1000 li 1000 H k 1000 1000 ot di fe T 027 COM2 03215 028 ui 029 p Is L 030 96 34980A Service Guide 34980A Service Guide Troubleshooting and Diagnostics For the 34923A relay part numbers are given on page 127 and the component locator is shown on page 138 The table below shows the relationship of channel numbers to relay numbers 4 Bank 1 Bank 2 2 4 Wire 1 wire Relay 2 4 Wire 1 Wire Relay Channel Channel Channel Channel 001 001 002 K401 021 041 042 K501 002 003 004 K401 022 043 044 K501 003 005 006 K402 023 045 046 K502 004 007 008 K403 024 047 048 K503 005 009 010 K405 025 049 050 K505 006 011 012 K401 026 051 052 K501 007 013 014 K402 027 053 054 K502 008 015 016 K403 028 055 056 K503 009 017 018 K404 029 057
83. e Electronic Calibration The instrument features closed case electronic calibration No internal mechanical adjustments are required The instrument calculates correction factors based upon the input reference value you set The new correction factors are stored in non volatile memory until the next calibration adjustment is performed Non volatile EEPROM calibration memory does not change when power has been off or after a remote interface reset Agilent Technologies Calibration Services Agilent Technologies offers calibration services at competitive prices When your instrument is due for calibration contact your local Agilent Service Center for recalibration See Types of Service Available on page 6 for information on contacting Agilent Calibration Interval The instrument should be calibrated on a regular interval determined by the measurement accuracy requirements of your application A 1 year interval is adequate for most applications Accuracy specifications are warranted only if adjustment is made at regular calibration intervals Accuracy specifications are not warranted beyond the l year calibration interval Agilent does not recommend extending calibration intervals beyond 2 years for any application Adjustment is Recommended Specifications are only guaranteed within the period stated from the last adjustment Whatever calibration interval you select Agilent recommends that complete re adjustment should always be perfo
84. e Guide 34980A Service Guide Self Test Errors Troubleshooting and Diagnostics 4 These errors can indicate a hardware failure The first two errors 601 and 602 can indicate a failure of the communications board The remaining errors are typically caused by a failure on the internal DMM Error 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 Description Self test front panel not responding Self test RAM read write Self test A D sync stuck Self test A D slope convergence Self test Cal not able to calibrate rundown gain Self test Cal rundown gain out of range Self test rundown too noisy Serial configuration readback failed DC gain x1 failed DC gain x10 failed DC gain x100 failed Ohms 500 nA source failed Ohms 5 uA source failed DC 1000V zero failed Ohms 10 uA source failed DC current sense failed Ohms 100 uA source failed DC high voltage attenuator failed Ohms 1 mA source failed AC rms zero failed AC rms full scale failed Frequency counter failed Cannot calibrate precharge Unable to sense line frequency I O processor does not respond I O processor failed self test 85 4 86 Troubleshooting and Diagnostics Calibration Errors The following errors indicate failures that may occur during a calibration Often performing the calibration again will clear these er
85. e optional 34921T terminal block The isothermal block is located on and is an integral part of the terminal block There are no adjustments for the reference junction Thermocouple Reference Junction Verification 1 Read Plug in Module Test Considerations on page 65 2 Connect a calibrated thermocouple to channel 21 3 Install the module in slot 1 4 Place the J Type calibrated thermocouple at a known temperature ice bath or calibrator 5 Select Channel 21 Configure the channel as follows TEMPERATURE THERMOCOUPLE J TYPE INTEG 10 PLC INTERNAL REF n ENS TEMP TRAN TYPE TC 01021 ENS TEMP TRAN TC TYPE J 01021 ENS TEMP NPLC 10 1021 ENS TEMP TRANS TC RJUN TYPE INT 01021 n uU 6 Subtract the thermocouple error from the measured temperature Verify the result is within 1 0 C of the known temperature set in step 4 76 34980A Service Guide Agilent 34980A Multifunction Switch Measure Unit Service Guide 4 Troubleshooting and Diagnostics Troubleshooting Hints 78 Power Supply 79 Product Firmware Updates 79 Instrument Errors 80 Error Numbers 82 Isolate a Problem with a Plug In Module 90 Relay and FET Replacement 91 34921A 40 Channel Armature Multiplexer with Low Thermal Offset 92 34922A 70 Channel Armature Multiplexer 94 34923A 40 80 Channel Reed Multiplexer 96 34924A 70 Channel Reed Multiplexer 98 34925A 40 80 Chann
86. e self test send the TST command This command performs a complete self test of the instrument and all installed plug in modules and returns a pass fail indication The self test runs a series of tests and depending upon the modules installed may take up to 2 minutes to complete be sure to set an appropriate interface time out If all tests pass you can have a high confidence that the instrument and all installed plug in modules are operational If the self test is successful SELF TEST PASSED is displayed on the front panel If the self test fails SELF TEST FAILED is displayed and an error number is shown Self test error numbers and their meaning are shown in the table on page 85 The self test will abort if any signals are connected to 1 via the rear panel Analog Bus connector pins 4 5 and 9 Be sure to disconnect any signals from ABus1 prior to running the self test On the 34945A Microwave Switch Attenuator Driver this command performs a self test of the 34945A and all connected 34945EXT remote modules If you have a 34951A Isolated DAC Module installed the self test will require an additional 15 seconds to complete per DAC module a memory test is performed If one or more tests fail return the instrument to Agilent for service Self Test Error Numbers On the remote interface a self test failure will generate SCPI error 330 and a supplemental message indicating one of the test numbers shown in th
87. e table on page 85 Calibration Errors The table on page 86 shows failures that may occur during a calibration 34980A Service Guide Obtaining Service 1 Electrostatic Discharge ESD Precautions 34980A Service Guide Almost all electrical components can be damaged by electrostatic discharge ESD during handling Component damage can occur at electrostatic discharge voltages as low as 50 volts The following guidelines will help prevent ESD damage when servicing the instrument or any electronic device Disassemble instruments only in a static free work area Use a conductive work area to reduce static charges Use a conductive wrist strap to reduce static charge accumulation Minimize handling Keep replacement parts in original static free packaging Remove all plastic foam vinyl paper and other static generating materials from the immediate work area Use only anti static solder suckers 1 Obtaining Service 10 34980A Service Guide Agilent 34980A Multifunction Switch Measure Unit Service Guide 2 Specifications Multiplexer Module Specifications and Characteristics 12 Matrix Modules Specifications and Characteristics 14 GP Actuator Module Specifications and Characteristics 16 RF and Microwave Module Specifications and Characteristics 17 34945A 34945EXT Module Specifications and Characteristics 19 34950A 64 channel Digital 1 0 Specifications and Characteristics 20 34951A 4 channel D A Converter Specifica
88. e the relay contact resistance The Agilent Y1131A Verification Diagnostic Software Kit is a recommended tool and contains software and hardware used to test the relay switching modules available for the Agilent 34980A Multifunction Switch Measure Unit The software provides module specific tests to assist you with troubleshooting possible relay failures and predicting system maintenance requirements Custom terminal blocks are provided to route signals and isolate individual relays for verification and diagnostics For several of the relay switching modules it is very difficult to isolate a particular channel The Y1131A Verification Diagnostic Software used in conjunction with the provided verification terminal blocks attempts to isolate measurement channels in a repeatable manner 91 4 92 Troubleshooting and Diagnostics 34921A 40 Channel Armature Multiplexer with Low Thermal Offset The 34921A 40 Channel Armature Multiplexer 40 Ch Arm MUX is divided into two banks with 20 latching armature switches channels 1 20 and 21 40 in each This module also offers four additional fused relays channels 41 44 for making AC and DC current measurements with the internal DMM with no external shunts needed These current channels feature make before break connections to ensure continuous current flow when switching from one current channel to another The current fuses are replaceable This module also contains nine armature Analog
89. el Optically Isolated FET Multiplexer 100 34931A Dual 4x8 Armature Matrix 102 34932A Dual 4x16 Armature Matrix 104 34933A Dual Quad 4x8 Reed Matrix 107 34937A 32 Channel GP Switch 111 34938A 20 Channel High Current GP Switch 112 RE Agilent Technologies 71 4 Troubleshooting and Diagnostics Troubleshooting and Diagnostics 78 This chapter provides basic instructions to isolate a problem Troubleshooting Hints This section provides a brief checklist of common failures Before troubleshooting the instrument be sure the failure is in the instrument rather than any external connections Unit seems inoperative 1 2 3 5 Verify the ac power cord is connected to the instrument Press the front panel power switch Listen for the fan on the right side of the instrument to isolate a problem with the front panel Remove all plug in modules to verify a module is not causing the failure Verify the power supply as described on page 79 Isolating to an assembly 1 Remove all plug in modules from the mainframe 2 Remove any connections to the Analog Bus 3 Turn on power and listen for the beep and fan operation The fan operates from the main power supply 4 Isolate the internal DMM by removing it from the instrument The instrument should turn on and pass self test without the internal DMM installed Disassembly procedures begin on page 115 Unit fails self test 1 Check the display for the power on self test r
90. eliable for errors or for incidental or consequential damages in con nection with the furnishing use or performance of this document or of any information contained herein Should Agilent and the user have a separate written agreement with warranty terms covering the mate rial in this document that conflict with these terms the warranty terms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license Restricted Rights Legend U S Government Restricted Rights Software and technical data rights granted to the federal government include only those rights customarily provided to end user customers Agilent provides this customary commercial license in Soft ware and technical data pursuant to FAR 12 211 Technical Data and 12 212 Computer Software and for the Depart ment of Defense DFARS 252 227 7015 Technical Data Commercial Items and DFARS 227 7202 3 Rights in Commer cial Computer Software or Computer Software Documentation Safety Notices CAUTION A CAUTION notice denotes a hazard It calls attention to an operating procedure practice or the like that if not correctly per formed or adhered to could result in damage to the product or loss of important data Do not proceed beyond a CAUTION notice until the indicated conditions are full
91. eplaceable Parts 34931A Replaceable Parts 34932A Replaceable Parts 34933A Replaceable Parts 34937A Replaceable Parts 34938A Replaceable Parts 34946A and 34947A Replaceable Parts Vendor Addresses 131 34921A Component Locator 34922A Component Locator 34923A Component Locator 34924A Component Locator 124 124 125 126 126 127 127 127 128 129 130 130 130 136 137 138 139 34925A Component Locator Top 34925A Component Locator Bottom 34931A Component Locator 34932A Component Locator 34933A Component Locator 34937A Component Locator 34938A Component Locator 142 143 144 145 146 34980A Service Guide Agilent 34980A Multifunction Switch Measure Unit Service Guide 1 Obtaining Service Operating Checklist 6 Types of Service Available 6 Repackaging for Shipment 7 Cleaning 7 Self Test Procedures 8 Electrostatic Discharge ESD Precautions 9 RE Agilent Technologies 1 Obtaining Service Obtaining Service Operating Checklist Before returning your instrument to Agilent for service or repair check the following items Is the instrument inoperative Verify that the power cord is connected to the instrument and to ac line power Verify the front panel power switch is depressed Does the instrument fail self test Remove all test connections to the instrument and run the self test again Errors may be induced by ac signals present on the instrument input terminal
92. eristics Eight 8 bit channels 8 bits wide input or output non isolated Vin ov 5vll Vout 1 66 V 5 VT lout max 24 mA I Frequency max 10 MHz 131 max 400 mA tise Output typ 6 ns M 10K Vcc ANN 5V 59 2 Roullup Zo 10Q s OE gt 2 5 pF 147 264 DOUT AAN AAA y o A 5V 1 Configurable by 8 bit DIN lt channel lt VTHREF 2 Lower current drive at i IM lower voltages 1 of 64 3 From memory with handshaking 4 5 V 50 load Active Drive Open Collector Vin 0V 5V Vout 0V 5V Vout L 0 24 V lt Vout lt 0 55 V 4 mA lt lout lt 24 mA 4 mA lt lout lt 24 mA Vout H 1 6 V lt Vout lt 5 V Vcc lt 2V 2150 lt Rpullup lt 1 4 mA lt lout lt 24 mA Vcc gt 2V 2150 lt Rpullup lt 10 20 34980A Service Guide Specifications 34950A 64 channel Digital 1 0 Specifications and Characteristics continued Handshake lines Vin ov 5v Vout 166 v 5 v I7 out max 24 mA UI Frequency max 10 MHz Counter function characteristics Maximum frequency 10 MHz max 50 duty Vin 0v 5v B tise Input min 5 us Totalizer function characteristics Maximum count 232 _ 1 4 294 967 296 Maximum input frequency 10 MHz rising or falling edge programmable Vin 01 5
93. esults 2 Remove all plug in modules from the mainframe and any connections to the Analog Bus Run the self test again A passing self test indicates a problem with a plug in module Replace the plug in modules one at a time to isolate the failing module 3 If the self test still fails remove the internal DMM from the instrument The instrument should turn on and pass self test without the internal DMM installed Disassembly procedures begin on page 115 4 Self test errors are described beginning on page 82 34980A Service Guide Troubleshooting and Diagnostics 4 Power Supply The main power supply provides 12 Volts All other power supplies are derived from this supply To test the main power supply WARNING Exposed Mains When the instrument cover is removed to test the power supply the ac mains are exposed 1 Disassemble the instrument as described beginning on page 115 2 Use a DVM to check that the power supply output is 12 V 0 6 V Test the power supply output at the red leads on the power supply connector to the communications board a The 12 Volt supply is always on when the ac power is applied to the instrument Test for loading errors by unplugging the power supply connector from the communications board 3 Use an oscilloscope to verify there is no ac oscillation on the 12 V power supply Replace the power supply assembly if 12 V is not present Product Firmware Updates As new product features and enhan
94. evel 1 Vp p min 42 Vpk max Threshold 0 V or TTL Gate input TTL Hi TTL Lo or none Count reset Manual or read reset Read speed 85 rds s Analog output characteristics DAC 1 2 12 V non isolated Resolution 1 mV IOUT 10 mA max Settling time 1 ms to 0 01 of output Accuracy of output mV 1 year 0 25 20 mV Temperature coefficient 0 015 1mV C 24 34980A Service Guide 34959A Breadboard Module Specifications and Characteristics 34980A Service Guide General specifications Specifications 2 Maximum module power dissipation 6 W Power available 12 V regulation no load to fullload 10 5 V regulation no load to full load 5 Maximum power from 12 V 6W Maximum power from 5 V 1W Relay drives 28 sink up to 100 mA GPIO ports Channel 1 and 2 8 configure bits as input or output Channel 3 3 output bits Dimensions L x W x H 5 4 x 7 5 x 0 9 inches without PC board 5 4 x 7 5 x 0 7 inches with PC board 25 2 Specifications Internal DMM Specifications and Characteristics DC and Resistance Specifications DMM accuracy 96 of reading of range Includes measurement error switching error and transducer conversion error Function Range Test Current or 24 hour 1777 90 days 1 year Temperature Burden Voltage Tcal 1 C Teal 5 C Tcal 1 C coefficient Teal 5 C DC voltage 100 0000 mV
95. f 01002 R1017 vefoo2t aus TP 104 TP103 ae E103 TP106 TP105 U308 usid U31 o9 U312 0315 0314 e 5 D EAM RP403 RP407 RP409 93599 5 C2895 RP501 RP507 RP505 s d 2 1 00 R802 R803 0307 0309 0313 03161 nnn nnn nno oon S LT LT D C1007 D Q802 Q800 Q804 Q806 me Lag C1010 RP401 RP405 RP503 RP509 CR10061P L E 8 C800 N N vn wo o n Oo o m E NX On Qu Qe Mo n eet cim att ad ott y or w c c wd gu wu rH oz o O S o o G S o O G m a 5 e A 5 a 5 JH fra fo Jol S s fal 9 fa o Jo jo o Si IR IR IS ALINI PSE INI n x ie e lel e cile ej x le San OR SR 348 Eoo dur um dE EE m ehet sibel EDD om SUSE RORO cio DL EI po m eo 9 HII ES al Is pe p o o o N JA N m IM C903 jo
96. gilent Technologies 113 5 Disassembly and Repair Electrostatic Discharge ESD Precautions Almost all electrical components can be damaged by electrostatic discharge ESD during handling Component damage can occur at electrostatic discharge voltages as low as 50 volts The following guidelines will help prevent ESD damage when servicing the instrument or one of the plug in modules Disassembly the instrument only in a static free work area Use a conductive work area to dissipate any static charge Use a conductive wrist strap to dissipate static charge accumulation Minimize handling Keep replacement parts in their original static free packaging Remove all plastic foam vinyl paper and other static generating materials from the immediate work area Use only anti static solder suckers Surface Mount Repair Surface mount components should only be removed using soldering irons or desoldering stations expressly designed for surface mount components Use of conventional solder removal equipment will almost always results in permanent damage to the printed circuit board Tools Required The following tools are required for basic disassembly 114 T20 Torx driver 3 16 nut driver for rear panel connectors 9 32 nut driver for GP IB connector 2 Pozidrive for fan 34980A Service Guide Disassembly and Repair 5 Basic Disassembly Observe the electrostatic discharge precautions given on page 114
97. h cig ah Gab ig Cg gh i bsa ah ft ig age pth igh pth igs ge ah igs igh s gh Ch ig gi Ch ah bsa s p i ie wa s sa as sn on na an um Ba Bs B oss Bs en i nh ea inh is i D GS Gh igh Bab gh igh igh dyi zo co azalea roc reso erri ren es pom _ ES P901 a P902 C 2 J Diagrams n 8 143 8 Diagrams 34933A Component Locator c a Ji m 8 E C U205 mag O USOT U303 Em em m a B 8g CINE LI a Or S m le LE b R603 R60 Usos uso Usod 0519 ps27 B GH Ga GH EE mmy B 0315 8 mi U415 0417 0427 O U401 U403 0405 U407 U409 U411 04137
98. h lt 1 mA load current Increased relay channel resistance for measurements with load currents below 1 mA can occur on cards that have been out of service or following relay inactivity for periods of greater than 1 week Switching relays for 2k cycles prior to use typically corrects this problem Agilent recommends the use of 4 wire ohms for resistance measurements and the Hi Z input impedance configuration for voltage measurements Applies to 34931A 34932A 14 34980A Service Guide Matrix Modules Specifications and Characteristics continued 34931A AC characteristics Bandwidth at terminal block 1 30 MHz Crosstalk at terminal block ch ch 300 kHz 65 dB 1 MHz 55 dB 20 MHz 30 dB Capacitance at terminal block HI LO 50 pF LO earth 80 pF General characteristics Relay life typical No load 100 M 10 V 100 ma 10M Rated load 100 k Open close time 4 ms 4 ms Analog bus backplane connection Bank 2 34932A 30 MHz 65 dB 55 dB 30 dB 50 pF 80 pF 100 M 10M 100 k 4 ms 4 ms Bank 2 34933A 30 2121 4 MHz 8 2 MHz 1 wire 65 dB 55 dB 40 dB 80 pF 75 pF 1000 M 10 M 10k 0 5 ms 0 5 ms Bank 2 Specifications 2 34934A 35 MHz 2 wire 15 MHz 1 wire 65 dB 55 dB 33 dB 45 pF 250 pF 1000 M operations 0 35 ms 0 10 ms No 1 50 Q source 50 Q load differential measurements verified Sdd21 2 With in rush resistors bypassed B With 100 Q input protection resistor
99. he current switches use two relays to create a make before break circuit You should replace both relays 34980A Service Guide 93 4 Troubleshooting and Diagnostics 34922A 70 Channel Armature Multiplexer The high density 34922A 70 Channel Armature Multiplexer 70 Ch Arm MUX is divided into two banks with 35 latching armature switches channels 1 35 and 36 70 in each This module also contains eight armature Analog Bus relays channels 911 914 and 921 924 four on each bank that can connect the bank relays to the system Analog Buses Through ABusl and ABus2 you can connect any of the channels to the internal DMM for voltage or resistance measurements Refer to the simplified schematic below NOTE Bank Relays Armature latching Analog Bus Relays Armature non latching Bank 1 H 008 212 015 L4 022 L4 eo s H 0 002 0 0 0 0 003 004 005 006 007 1 25 25 zE ose 25 911 ABus1 ABus2 DMM DMM MEAS SENS 921 922 923 924 060218 o lo ee ost WEOL loss 0 TT oes TE 053 eae tet 054 a 061 pt 068 1 ise pe Lose os Tt ji Bank 2 For the 34922A relay part numbers are given on page 126 and the component locator is shown on page 137 The table on the next page shows the relationship of channel numbers to relay numbers 94 34980
100. heck adjustment or repair is required Performance Verification Tests The performance verification tests are recommended as acceptance tests when you first receive the instrument The acceptance test results should be compared against the 90 day test limits You should use the 24 hour test limits only for verification within 24 hours after performing the adjustment procedure After acceptance you should repeat the performance verification tests at every calibration interval If the instrument fails performance verification adjustment or repair is required Adjustment is recommended at every calibration interval If adjustment is not made you must guard band using no more than 80 of the specifications as the verification limits 51 3 Calibration Procedures Internal DMMI Input Connections Test connections to the internal DMM are best accomplished using the rear panel Analog Bus connector ABus You may need to remove the cover for access to this connector A test fixture can be constructed using a standard DB9 male connector some shielded twisted pair PTFE insulated cables and appropriate connectors for the calibrator output you are using You may also use one of the multiplexer modules to connect the calibrator output to the DMM If you use a multiplexer module you must take into account any additional relay contacts and resistances in the measurement path To do this use the switch measure model to set up the DMM and
101. inal 1 year 10 V Q 45 mV OV Q 20 mV 10 V 45 mV Analog Output Adjustment Install the 34952A module in the mainframe and allow a 1 hour warm up before performing these procedures This adjustment procedure sets a zero adjustment and a gain adjustment constant for each DAC output You must perform all the adjustments on one analog output channel before adjusting the other analog output channel 1 Install the module s in the instrument 2 Unsecure the instrument for calibration see page 47 3 Connect channel 6 DAC output to the DMM input Set the DMM to measure DC volts 4 The calibration procedure makes two adjustments per channel After sending the first command measure the module output Send the measured value to the module and advance to the next point This procedure is summarized as follows a Send the following command to begin the procedure CALibration BEGin VOLTage 1 lt channel gt b Measure the module output c Send the measured value to the module with the following command CALibration POINt lt value gt d The command returns a 1 to indicate it is ready for the next point e Measure the module output f Send the measured value to the module with the following command CALibration POINt lt value gt g The command returns a 0 to indicate the calibration on the channel is completed 5 Repeat steps 3 and 4 for channel 7 34980A Service Guide 73 3 Calibration Pro
102. internal DMM Query and update the firmware revisions for the mainframe and modules Configure Key Group Set parameters for measurement DMM Set DMM measurement function AC volts DC volts AC current DC current 2 wire ohms 4 wire ohms temperature frequency and period Set function parameters Channel Set channel measurement function AC volts DC volts AC current 34921A only DC current 34921A only 2 wire ohms 4 wire ohms temperature frequency and period Set function parameters Scan Set up trigger in parameters Set up sweep count Set up sample count Sequence View sequence command string Execute sequence Delete sequence definitions Module Open all relays Clear all measurement functions Clear channel labels Configure external trigger and clock 34951A Set trace or level mode 34951A Set waveform parameters 34951A View View errors and alarms 34980A Service Guide viii Advanced Available at a later firmware release Alarm Select one of four alarms to report alarm conditions on the displayed channel Configure a high limit a low limit or both for the displayed channel Select the slope rising or falling edge for the four alarm output lines 34980A Service Guide Instrument Rack Mounting Using the optional Agilent Y1130A Rack Mount Kit you can mount the 34980A in a standard 19 inch rack cabinet This kit includes rack mount bracket
103. ith 20 overrange capability can display a measurement with up to 1 200 000 counts of resolution This corresponds to about 0 0001 1 ppm of full scale or 21 bits including the sign bit All four specifications are equivalent 34980A Service Guide 39 2 40 Specifications Accuracy Accuracy is a measure of the exactness to which the internal DMM s measurement uncertainty can be determined relative to the calibration reference used Absolute accuracy includes the Internal DMM s relative accuracy specification plus the known error of the calibration reference relative to national standards such as the U S National Institute of Standards and Technology To be meaningful the accuracy specifications must be accompanied with the conditions under which they are valid These conditions should include temperature humidity and time There is no standard convention among instrument manufacturers for the confidence limits at which specifications are set The table below shows the probability of non conformance for each specification with the given assumptions Specification Criteria Probability of Failure Mean 2 sigma 4 596 Mean 3 sigma 0 396 Variations in performance from reading to reading and instrument to instrument decrease for increasing number of sigma for a given specification This means that you can achieve greater actual measurement precision for a specific accuracy specification number The internal DDMM is de
104. kO 250 90 11Q 1MQ 1MQ 300 900 110Q 10 MQ 10 MQ Q 16 2 1kQ 4 1kQ 100 100 MQ 310kQ 810 kO 810 KQ 10 mA DC Current 10 mA 1 5 uA 5 uA 7 uA 100 mA 100 mA Q l4uA 35 uA 55 uA 1A 1A 560 uA 900 pA 1 1 mA 1 Select 6 1 2 digit resolution 2 The 2 wire ohms resistance verification test is optional see Gain Adjustment Considerations on page 61 For 2 wire ohms using a multiplexer for the input connections an additional 4 Q of error for the relay contacts must be added Add a 1 second channel delay when using Fluke 5700 in 2 wire compensated mode This avoids response time issues with 2 wire compensation when 34980A s current source contains a pulse 3 Verify only no adjustment required Q Quick performance verification test points 34980A Service Guide AC VOLIS Gain Verification Test Configuration AC Volts CONFigure VOLTage AC LF 3 HZ SLOW SENSe VOLTage AC BANDwidth 3 Calibration Procedures 1 Make sure you have read DMM Test Considerations on page 53 2 Set the AC VOLTS function and the 3 Hz input filter With the slow filter selected each measurement takes 7 seconds to complete 3 3 Select each range in the order shown below Provide the indicated input voltage and frequency Compare measurement results to the appropriate test limits shown in the table Be certain to allow for appropriate source settling Vrms 100 mV 100 mV 1V 1V 10 V 10 V 10 V
105. l trigger during scans Over temperature condition One or more general purpose 34937A 34938A modules have reached their over temperature limits HI or LO alarm condition has occurred on the indicated alarms Alarms are enabled on the displayed channel Scaling enabled on channel This appears on display after you select scaling function via front panel or remote interface 4 wire measurement specified on channel This appears on display after you select the 4 wire function via the front panel or remote interface Offset Compensation specified on channel This appears on display after you have selected the offset compensation function via the front panel or remote interface Measurement is in progress 34980A Service Guide Front Panel Menu Reference This section gives an overview of the top two levels of menus that you access from the front panel The menus are designed to automatically guide you through all parameters required to configure a particular function or operation Store Recall Store and recall instrument states Store up to six instrument states in non volatile memory Assign a name to each storage location Recall stored states power down state factory reset state or preset state Utility Configure system related instrument parameters Connecting and configuring to use with LAN GPIB or USB Set the real time clock and calendar Set radix character thousand separator Enable disable the
106. ltiplexer Module Specifications and Characteristics 12 Matrix Modules Specifications and Characteristics 14 GP Actuator Module Specifications and Characteristics 16 RF and Microwave Module Specifications and Characteristics 17 34945A 34945EXT Module Specifications and Characteristics 19 34950A 64 channel Digital I O Specifications and Characteristics 20 34951A 4 channel D A Converter Specifications and Characteristics 22 34952A Multifunction Module Specifications and Characteristics 24 34959A Breadboard Module Specifications and Characteristics 25 Internal DMM Specifications and Characteristics 26 Typical System Speeds 29 Internal DMM Measurement Characteristics 31 System Specifications and Characteristics 35 Product Dimensions 37 To Calculate Total DMM Measurement Error 38 Interpreting Internal DMM Specifications 40 Configuring for Highest Accuracy Measurements 42 3 Calibration Procedures Agilent Technologies Calibration Services 44 Calibration Interval 44 Adjustment is Recommended 44 Time Required for Calibration 45 Automating Calibration Procedures 45 Recommended Test Equipment 46 Calibration Security 47 Calibration Message 48 Calibration Count 48 Calibration Process 49 Aborting a Calibration in Progress 49 Performance Verification Tests 50 Input Connections 52 DMM Test Considerations 53 Internal DMM Verification Tests 53 Optional AC Performance Verification Tests 59 Internal DMM Adjustments 60 Gain Adjustment 61
107. manual to instruments and assemblies not directly covered by the current content There are no backdated assemblies at the time of this printing 134 34980A Service Guide Agilent 34980A Multifunction Switch Measure Unit Service Guide 8 Diagrams 34921A Component Locator 34922A Component Locator 34923A Component Locator 34924A Component Locator 136 137 138 139 34925A Component Locator Top 34925A Component Locator Bottom 34931A Component Locator 34932A Component Locator 34933A Component Locator 34937A Component Locator 34938A Component Locator 142 143 144 145 146 RE Agilent Technologies 135 8 Diagrams 34921A Component Locator a a J101 O amp 60600000000 a P 0000000000 H 0000000000 K931 o OR ET K921 EF L1 Ge Y201 3 a U303 0 era O U301 U305 exu 8 VET di 8415 1043 8 q N lt gt A All SI LTDA ALIA SI S9 AAU ATS Sli el ells a i O
108. ment changes in ambient temperature changing the mainframe slot used adding or removing modules to a system These adjustments can be made either volatile or non volatile as described below The adjustment procedure is given beginning on page 70 There are two ways to adjust the DACs depending upon the state of calibration security see Calibration Security on page 47 If the instrument is secured for calibration when the adjustment is begun the adjustments are considered volatile All adjustments are discarded when power is cycled This provides an easy means to make immediate temperature compensated adjustments to the DAC outputs without overwriting stored calibration constants When this type of adjustment is made the calibration count see page 48 is not advanced If the instrument is unsecured for calibration the adjustments are written to non volatile calibration memory The calibration count see page 48 is advanced 34980A Service Guide 67 3 Calibration Procedures 34951A Verification Test Connections The DAC outputs can be measured using an external voltmeter or using a test fixture such as the one shown below with the internal DMM via the ABus connector on the instrument s rear panel I Pin 5 DMM Current DMM Source HI Pin 9 Pin 4 DMM Source LO X gt L Channels 1 2 3 or 4 Voltage Output 95 9 To Channels 1 2 3 or 4 Current Output 68 34
109. ments You will need a test input fixture to adjust the internal DMM see page 52 Zero Adjustment Each time you perform a zero adjustment the Internal DMM stores a new set of offset correction constants for every measurement function and range The Internal DMM will sequence through all required functions and ranges automatically and store new zero offset calibration constants All offset corrections are determined automatically You may not correct a single range or function without re entering ALL zero offset correction constants automatically This feature is intended to save calibration time and improve zero calibration consistency Never turn off the Internal DMM during Zero Adjustment This may cause ALL calibration memory to be lost Zero Adjustment Procedure The zero adjustment procedure takes about 5 minutes to complete Be sure to allow the instrument to warm up for 2 hours before performing the adjustments Follow the steps outlined below Review DMM Test Considerations on page 53 before beginning this test 1 This procedure will use the copper shorts installed on input test connector Leave the Current input connection open 2 Set the DC VOLTS function 3 Send the value 0 000000 to the instrument using the CALibration VALue 0 000000 command 4 Calibrate the instrument using the CALibration command 5 Perform the Zero Offset Verification on page 53 to check zero calibration results 34980A Service
110. mponent Locator Top uao JIUI E110 E112 El14 E116 E118 E120 E122 E124 BEE BB RIDERS RE EAE AAAAAAAAAAAAAAAA Q E102 E101 TP 01 C D c204 RP 0202 200 lu TP100 D C100 E104 m Pm 1419 191 Jo ea 0 ee 9 GU amp U201 a R9020 r3C900 p102 07 C9025 R900 Rel LJ U104 cto6 ugoo BDS1001 US17 RP901 UR1021 0103 0102 mm mo R400 S RP BET 00 cag C400 l C100 C401 1001 ap U400 300 U301 26 sm LH m C500 CR1008 R500 N 1009 j B Uuiooj 0106 6327 L3C302 C303 C304 RP300 RP301 Eis el P U302 0505 0304 C3050 C3060 JvR1oo Corp 1000 i Riole S 305 0306 O
111. multiplexer for the input connections an additional 4 Q of error for the relay contacts must be added Q Quick performance verification test points Zero offset calibration using a multifunction calibrator is NOT recommended The calibrator and cabling offset can be large and unstable causing poor offset calibration of the internal DMM 34980A Service Guide 55 3 Calibration Procedures Gain Verification This procedure is used to check the full scale reading accuracy of the internal DMM Verification checks are performed only for those functions 56 and ranges with unique gain calibration constants DC VOLTS Resistance and DC CURRENT Gain Verification Test 1 Make sure you have read DMM Test Considerations on page 53 2 Select each function and range in the order shown below Provide the input shown in the table below 3 Make a measurement and return the result Compare measurement results to the appropriate test limits shown in the table Be certain to allow for appropriate source settling when using the Fluke 5700A Input Quick Error from Nominal Function Range on 24 hour 90 day 1 year 100 mV DC Vols 100 mV 6 5 uV 8 uV 9 uV 1V 1V 26 uV 37uV 47 10 V 10 V I9HuV 250 400 100 V 100 V Q 26mV 4 1 mV 5 1 mV 300 V 300 V 12 mV 19 5mV 22 5 mV 100 Q 2 Wire Ohms 1000 6 5 mQ 12 mQ 14 mO 1kQ lm 1kQ Q z26mO 90 mQ 110mQ ms 10kQ 10kQ 250mO 900mQ 110 100 kQ 100
112. n J 150 C to 1200 10 C 210 Cto 150 C1 2 C 0 03 terminal block K 100 C to 1200 10 C 200 Cto 100 C15 C 0 03 N 100 to 1300 10 C 200 Cto 100 C 1 5 C 0 03 R 300 C to 1760 12 50 Cto300 C 18 C 0 03 C S 400 C to 1760 C 12 50 Cto400 C 18 C 0 03 C T 100 C to 400 C 10 200 Cto 100 C15 C 0 03 RTD Ro from 49 Q to 200 C to 600 C 0 06 0 003 C 2 1 Thermistor 2 2k bk 10k 80 Cto 150 C 0 08 0 002 C 1 For total measurement accuracy add temperature probe error 28 34980A Service Guide Typical System Speeds Measurements made on a 3 2 GHz PC running VB6 in Windows XP Professional Specifications 2 Single Channel Reading Direct Measurements direct to 1 0 Direct Time in msec includes switch measure time and 1 0 time Measurment to Memory GPIB Single Channel 1 2 GPIB USB 2 0 LAN Measurement w VXI 11 into memory Single Channel DCV 2 83 ms 3 14 ms 4 57 ms 1 9 ms Single Channel ACV 5 00 ms 5 35 ms 5 75 ms 4 ms Single Channel Ohms 2 91 ms 3 14 ms 4 65 ms 1 9 ms Single Channel while 9 52 ms 10 64 ms 11 76 ms 8 4 ms changing scale e g MEAS DCV 10 to MEAS DCV 1 Single Channel while 128 ms 120 ms 120 ms 120 ms changing function e g MEAS ACV to MEAS DCV Command Execution Time 131 34925A Open or Close 0 7 0 9 1 6 Read 2 9 3 3 4 7 Close Read Open 4 8 5 3 6 5 Init WAI 1 9 2 1 3 Close
113. n and totalize Scan triggering Source Interval external button press software or on monitor channel alarm Scan count 1 to 50 000 or continuous Scan interval 0 to 99 hours 1 ms step size Channel delay 0 to 60 seconds per channel 1 ms step size External trig delay lt 2 ms With monitor on lt 200 ms External trig jitter lt 2 ms Alarms Analog inputs Hi Lo or Hi Lo evaluated each scan Digital inputs 34950A 52A digital in maskable pattern match or state change 34950A 52A frequency and totalize Hi limit only Monitor channel Alarm evaluated each reading Alarm outputs 4 TTL compatible Selectable TTL logic Hi or Lo on fail Latency 5 ms typical Memory Type Volatile Readings 500 000 with timestamp readable during scan States 5 instrument states with user label Alarm queue Up to 20 events with channel number reading and timestamp System features Per channel math min max average Individual Mx B scaling and calculated real time Power fail recovery Save switch states Relay maintenance Counts each relay closure and stores on module user resettable Real time clock Battery backed 20 year typical life 34980A Service Guide Specifications 2 System Specifications and Characteristics continued General specifications Power supply Universal 100 V to 240 V 10 Power line frequency
114. nector on the rear panel Use a 9 32 nut driver to remove the nuts holding the GP IB connector on the rear panel 4 Use a T20 Torx to remove the four screws holding the KOM printed circuit assembly to the mainframe Lift out the assembly 34980A Service Guide Disassembly and Repair 5 Front Panel Removal 1 Loosen the front panel assembly by lifting gently on the four plastic ears and moving the front panel off the mainframe Stand the entire assembly on its side to make removal easier a Pull to unclip the ground connector from the mainframe b Swing the two clips securing the front panel connector ribbon cable to the front panel circuit board and unplug the connector 34980A Service Guide 119 5 Disassembly and Repair Front Panel Disassembly 1 Pull to remove the knob Use a 7 16 nut driver to remove the nut from the knob shaft 2 Remove the four T20 Torx screws from the circuit board and lift the circuit board out You can now lift out the keypad 120 34980A Service Guide Disassembly and Repair 5 DMM Removal 1 To remove the DMM if installed remove the front panel see the procedure on page 119 2 Unplug the ribbon cable at the top of the DMM assembly 3 Remove the two T20 Torx screws from the left front side of the mainframe 4 Move the DMM assembly to the right and lift out 5 Unplug the input cable from the backplane printed circuit board 34980A Service Guide 121 5
115. nges True RMS AC voltage Measurement method AC coupled True RMS measures the AC component of the input with up to 300 VDC of bias on any range Crest factor Maximum of 5 1 at full scale Additional crest factor errors non sinewave Crest factor 1 2 0 0596 of reading Crest factor 2 3 0 1596 of reading Crest factor 3 4 0 3096 of reading Crest factor 4 5 0 4096 of reading AC Filter Bandwidth Slow Medium Fast 3 Hz 300 kHz 20 Hz 300 kHz 200 Hz 300 kHz Input impedance 1 MQ 2 in parallel with 150 pF Input protection 300 Vrms all ranges Resistance Measurement method Selectable 4 wire or 2 wire ohms Current source Referenced to LO input Offset compensation Maximum lead resistance Selectable on 100 1 and10 kQ ranges 10 of range per lead for 100 and 1 ranges 1 KQ on all other ranges Input protection 300 V on all ranges 31 2 Specifications Internal DMM Measurement Characteristics continued Frequency and period Measurement method Reciprocal counting technique Voltage ranges Same as AC voltage function Gate time 1s 100 ms or 10 ms Measurement time out Selectable 3 Hz 20 Hz 200 Hz LF limit Measurement Consideration All frequency counters are susceptible to error when measuring low voltage low frequency signals Shielding inputs from external noise pickup is critical for minimizing measuremen
116. nt Technologies Service Center to provide shipping instructions including what components to ship Agilent recommends that you retain the original shipping carton for use in such shipments Repackaging for Shipment Cleaning 34980A Service Guide If the unit is to be shipped to Agilent for service or repair be sure to Remove all accessories or plug in modules from the mainframe Attach a tag to the unit identifying the owner and indicating the required service or repair Include the model number and full serial number Place the unit in its original container with appropriate packaging material for shipping Secure the container with strong tape or metal bands f the original shipping container is not available place your unit in a container which will ensure at least 4 inches of compressible packaging material around all sides for the instrument Use static free packaging materials to avoid additional damage to your unit Agilent suggests that you always insure shipments Clean the outside of the instrument with a soft lint free slightly dampened cloth Do not use detergent Disassembly is not required or recommended for cleaning 1 Obtaining Service Self Test Procedures Power On Self Test Each time the instrument is powered on a subset of self tests are performed These tests check that the minimum set of logic and output hardware are functioning properly Complete Self Test To perform a complet
117. on error numbers see page 86 34980A Service Guide 49 3 Calibration Procedures Performance Verification Tests Use the Performance verification Tests to verify the measurement performance of the instrument The performance verification tests use the instrument s specifications listed in Chapter 2 Specifications in this manual You can perform four different levels of performance verification tests Self Test A series of internal verification tests that give a high confidence that the instrument is operational Quick Verification A combination of the internal self tests and selected verification tests Performance Verification Tests An extensive set of tests that are recommended as an acceptance test when you first receive the instrument or after performing adjustments Optional Verification Tests Tests not performed with every calibration Perform these tests to verify additional specifications or functions of the instrument Self Test A brief power on self test occurs automatically whenever you turn on the instrument This limited test assures that the instrument is capable of operation and also checks the plug in modules for basic operation During the self test all display segments and annunciators are lit If the self test fails the ERROR annunciator turns on Read any errors using the front panel View menu or use the SYSTem ERRor command query from the remote interface If repair is required
118. r to the 34980A Programmer s Reference Help File for complete information To Unsecure the Instrument Without the Security Code To unsecure the instrument without the correct security code follow the steps below 1 Turn off the instrument 2 Press and hold the DMM Measure key and CANCEL key and turn on the unit You can release the keys when the unit has completed the power on sequence 3 Send the CALibration SECure STATe OFF lt code gt command to the instrument You may use any valid sequence of characters for the lt code gt value 4 The unit is now unsecured for calibration 5 Enter a new security code when calibration is complete Be sure to remember the new security code 34980A Service Guide 47 3 48 Calibration Procedures Calibration Message The instrument allows you to store a message in calibration memory You may store a calibration message for the mainframe the DMM the 34951A 4 Ch Isolated DAC Module and 34952A Multifunction Module For example you can store such information as the date when the last calibration was performed the date when the next calibration is due the instrument s serial number or even the name and phone number of the person to contact for a new calibration You can record a calibration message only from the remote interface and only when the instrument is unsecured You can read the calibration message whether the instrument is secured or unsecured The calibra
119. rature at calibration Tcal between 18 28 C 41 20 over range on all ranges except 300VDC and AC ranges and 1 ADC and AC current ranges 2190 minute warm up and a fixed configuration and 61 digits Temperature within 1 C of temperature at calibration Tcal between gt Accuracy for 4 wire ohms or 2 wire ohms with scaling to remove offset add 4 additional error plus the lead wire resistance to the 2 wire ohms function without scaling The 34921A and 34922A may have increased relay channel resistance up to an additional 50 which can occur on modules that have been out of service or following relay inactivity for periods of greater than 1 week Using 4 wire measurements or switching relays for 2k cycles prior to use typically corrects this problem 6 Add 50 uV error for 34923 24 33 26 34980A Service Guide Specifications AC Specifications of reading of range DMM accuracy of reading of range Includes measurement error switching error and transducer conversion error 2 Function Range Frequency 24 hour 77 90 days 1 year Temperature Tcal 1 Tcal 5 Tcal 1 coefficient Tcal 5 C True RMS 100 0000 mV to 3Hz 5Hz 1 00 0 03 1 00 0 04 1 00 0 04 0 100 0 004 AC voltage 100 0000 V 5Hz 10Hz 0 35 0 03 0 35 0 04 0 35 0 04 0 035 0 004 10Hz 20kHz 0 04 0 03 0 05 0 04 0 06 0 04 0 005 0 004 20kHz 50kHz 0 10 0 05 0 11 0 05 0 12 0 05 0 011 0 00
120. rmed at the calibration interval This will assure that the 34980A will remain within specification for the next calibration interval This criteria for re adjustment provides the best long term stability Performance data measured during Performance Verification Tests does not guarantee the instrument will remain within these limits unless the adjustments are performed Use the Calibration Count feature see page 48 to verify that all adjustments have been performed 44 34980A Service Guide Calibration Procedures 3 Time Required for Calibration The 34980A can be automatically calibrated under computer control With computer control you can perform the complete calibration procedure and performance verification tests in less than 30 minutes once the instrument is warmed up see DMM Test Considerations on page 53 Automating Calibration Procedures 34980A Service Guide You can automate the complete verification and adjustment procedures outlined in this manual You can program the instrument configurations specified for each test over the remote interface You can then enter readback verification data into a test program and compare the results to the appropriate test limit values You must adjust the instrument using the remote interface Adjustment cannot be performed from the local front panel The instrument must be unsecured prior to initiating the calibration procedure see Calibration Security on page 47 For
121. rors Error 701 702 703 704 705 706 707 708 709 710 711 720 721 722 723 724 725 730 731 732 733 734 735 736 740 741 742 743 744 745 746 747 747 748 748 748 748 748 749 Description Cal security disabled by jumper Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal Cal secured invalid secure code secure code too long aborted value out of range signal measurement out of range signal frequency out of range no cal for this function or range full scale correction out of range cal string too long DCV offset out of range DCI offset out of range RES offset out of range FRES offset out of range extended resistance self cal failed 300V DC correction out of range precharge DAC convergence failed A D turnover correction out of range AC flatness DAC convergence failed AC low frequency convergence failed AC low frequency correction out of range AC rms converter noise correction out of range AC rms 100th scale correction out of range Cal data lost secure state Cal data lost string data Cal data lost DCV corrections Cal data lost DCI corrections Cal data lost RES corrections Cal data lost FRES corrections Cal data lost AC corrections Calibration failed Cal checksum failed GPIB address Cal checksum failed internal data Cal
122. s 34980A Service Guide 2 Specifications Channels configurations Switch type Input characteristics per channel Max volts DC AC RMS 11 Max current DC AC RMS Power W VA 2 Volt Hertz limit General specifications Offset voltage Initial closed channel res DC Isolation ch ch ch earth AC characteristics Bandwidth at terminal block 8 Channel Isolation at terminal block I3 100 kHz 1 MHz 10 MHz Capacitance at terminal block CH CH CH earth General characteristics Relay life no load rated Open close time Initial reset relay state Analog bus backplane connection GP Actuator Module Specifications and Characteristics 34937A 28 Form C 4 Form A Armature latching Form 300 V Form A 30 VDC 250 VAC Form C 1 A switch 2 A carry Form A 5 A switch 8 A carry Form 60 W Form A 150 W 108 3 uV Form C 125 mQ Form A 50 mQ gt 10 GO 10 MHz 55 dB 35 dB 15 dB Form 12 pF Form A 10 pF Form 21 pF Form 18 pF Form 100 100 Form 50 30 k Form 4 ms 4 ms Form 10 ms 10 ms Form maintain state Form A user configurable No 34938A 20 Form A Armature latching 30 VDC 250 VAC 5 A switch 8 A carry 150 W 108 3 uV lt 60 mQ gt 10 GO 1 MHz 60 dB 40 dB 65 pF 105 pF 50 M 30 k 10 ms 10 ms User configurable No ll DC or AC RMS voltage
123. s and associated hardware required to forward or reverse mount the instrument in the rack cabinet For forward rack mounting 34980A front panel facing the front of the cabinet use the Agilent standard rack mount kit part number 5063 9214 For Agilent rack cabinets use the E3663A Basic Rail Kit sold separately For reverse rack mounting 34980A rear panel facing the front of the cabinet use the longer brackets see figure below with the hardware for the standard rack mount kit For Agilent rack cabinets use the E3664AC Third Party Rail Kit sold separately Reverse Rack Mount Orientation longer brackets used 34980A Service Guide x xi m 425 6 mm 16 76 in i 367 7 mm 14 48 in Y 1 lt amis 101 9 mm 4 01 in or 70 4 mm 2 78 in E 0 7 Agilent 34980A Dimensions shown with Reverse Rack Mount brackets installed 34980A Service Guide Contents Front Panel ata Glance Rear Panel ata Glance iv Rear Panel Connector Pinouts v Annunciator Display Indicators vi Front Panel Menu Reference vii Instrument Rack Mounting vii 1 Obtaining Service Operating Checklist 6 Types of Service Available 6 Repackaging for Shipment 7 Cleaning 7 Self Test Procedures 8 Electrostatic Discharge ESD Precautions 9 2 Specifications 34980A Service Guide Mu
124. s during self test Long test leads can act as an antenna causing pick up of ac signals Types of Service Available If your instrument fails during the warranty period Agilent Technologies will repair or replace it under the terms of your warranty After your warranty expires Agilent offers repair services at competitive prices Extended Service Contracts Many Agilent products are available with optional service contracts that extend the covered period after the standard warranty expires If you have such a service contract and your instrument fails during the covered period Agilent Technologies will repair or replace it in accordance with the contract 34980A Service Guide Obtaining Service 1 Obtaining Repair Service Worldwide To obtain service for your instrument in warranty under service contract or post warranty contact your nearest Agilent Technologies Service Center They will arrange to have your unit repaired or replaced and can provide warranty or repair cost information where applicable To obtain warranty service or technical support information you can contact Agilent Technologies at one of the following telephone numbers In the United States 800 829 4444 In Europe 31 20 547 2111 In Japan 0120 421 345 Or use our Web link for information on contacting Agilent worldwide www agilent com find assist Or contact your Agilent Technologies Representative Before shipping your instrument ask the Agile
125. signed and tested to meet performance better than mean 3 sigma of the published accuracy specifications 24 Hour Accuracy The 24 hour accuracy specification indicates the internal DMM s relative accuracy over its full measurement range for short time intervals and within a stable environment Short term accuracy is usually specified for a 24 hour period and for a 1 C temperature range 90 Day and 1 Year Accuracy These long term accuracy specifications are valid for a 23 C 5 C temperature range These specifications include the initial calibration errors plus the internal DMM s long term drift errors Temperature Coefficients Accuracy is usually specified for a 23 C 5 C temperature range This is a common temperature range for many operating environments You must add additional temperature coefficient errors to the accuracy specification if you are operating the instrument outside a 23 C 5 C temperature range the specification is per C 34980A Service Guide Specifications 2 Configuring for Highest Accuracy Measurements The measurement configurations shown below assume that the internal DMM is in its Factory Reset state It is also assumed that manual ranging is enabled to ensure proper full scale range selection DC Voltage DC Current and Resistance Measurements Set the resolution to 6 digits you can use the 6 digits slow mode for further noise reduction Set the input resistance to greater than 10 GO for
126. st memory corruption detected Configuration memory lost due to firmware revision change Out of memory use definite length block for large traces Error queue overflow DMM processor error queue overflowed Query INTERRUPTED Query UNTERMINATED 34980A Service Guide 34980A Service Guide Instrument Errors Troubleshooting and Diagnostics 4 These errors typically do not indicate a hardware failure They are related to improper settings usually in command parameters Error 111 112 113 114 201 202 203 204 221 222 222 223 224 225 226 227 251 261 262 263 264 271 272 281 291 292 Description Channel list slot number out of range Channel list channel number out of range Channel list empty scan list Channel list ABus channels not allowed as endpoint in range Memory lost stored state Memory lost power on state Memory lost stored readings Memory lost time and date Settings conflict calculate limit state forced off Settings conflict module type does not match state Settings conflict Scan list cleared Settings conflict trig source changed to IMM Settings conflict chan adv source changed to IMM Settings conflict DMM disabled or missing Settings conflict DMM enabled Settings conflict DMM not installed Unsupported temperature transducer type Not able to execute while scan initiated Not able to abort scan Not able to execute while DMM is me
127. sted in this service guide Parts not listed here are not field replaceable and assembly replacement is recommended To order replaceable parts from Agilent do the following 1 Contact your nearest Agilent Sales Office or Service Center 2 Identify the parts by the Agilent part number shown in the replaceable parts list 3 Provide the instrument model number and serial number Backdating and Part Changes Always refer to Chapter 7 Backdating before attempting repair or before ordering replaceable parts Parts changes if any are documented in the backdating chapter 34980A Service Guide Mainframe Replaceable Parts Replaceable Parts 6 Refer to the disassembly drawings beginning on page 115 Agilent Part Number 34980 66503 34980 66501 34980 67601 349980 61601 34980 61604 34980 61606 34980 61607 0950 4603 34980 48001 34980 48307 34980 66502 34980 49301 34970 87401 34980 04104 34980 48301 5041 9167 34980 48305 34980 48304 34980 66504 34980 68501 Description PCA backplane PCA KOM and Power Supply Line Filter Assembly Cable KOM to Backplane Cable front panel to KOM and DMM Cable Power Supply Cable ground green yellow Power Supply Module Keypad Front Panel PCA Front Panel Window Knob Mainframe Cover sheet metal Rear Bezel Foot Cover Analog Output Cover Slot PCA DMM Fan Assembly 34980A Service Guide 125 6 126 Replaceable Parts 34921A Replaceable Parts
128. t Configuration AC Current CONFigure CURRent AC LF 3 HZ SLOW SENSe CURRent AC BANDwidth 3 1 Make sure you have read DMM Test Considerations on page 53 2 Set the AC CURRENT function and the 3 Hz input filter With the slow filter selected each measurement takes 7 seconds to complete 3 Select each range in the order shown below Provide the input current and frequency indicated Compare measurement results to the appropriate test limits shown in the table Be certain to allow for appropriate source settling Input Quick Error from Nominal Check Current Frequency Range 24 hour 90 day 1 year 10 mA H 1 kHz 10 mA 14 l4pA 14 100 mA H 1 kHz 100 mA Q 600pA 600uA 600 10 mA 1 kHz 1A 141mA 141 1 41 mA H 1 kHz 1A 14mA l4mA l4mA 1 Verify only no adjustment Q Quick performance verification test points 34980A Service Guide 34980A Service Guide Calibration Procedures Frequency Gain Verification Test Configuration Frequency 6 digits SENSe FREQuency APERture 1 1 Make sure you have read DMM Test Considerations on page 53 2 Select the FREQUENCY function and set 6 digits 3 Select each range in the order shown below Provide the input voltage and frequency indicated Compare measurement results to the appropriate test limits shown in the table Be certain to allow for appropriate source settling Input Quick Error from Nominal Check Volt
129. t errors DC Current Shunt resistance 5Q for 10 mA 100 mA 0 1 Q for 1A Input protection 1A 250 V fuse on 34921A module True RMS AC current Measurement method Direct coupled to the fuse and shunt AC coupled True RMS measurement measures the ac component only Shunt resistance 5 Q for 10 mA 0 1 Q for 100 mA Input protection 1A 250 V fuse on 34921A module Thermocouple Conversion ITS 90 software compensation Reference junction type Internal fixed or external Open thermocouple check Selectable per channel Open gt 5 Thermistor 44004 44007 44006 series RTD a 0 00385 DIN and o 0 00392 Measurement noise rejection 60 50 Hz DC CMRR 140 dB AC CMRR 70 dB Integration time Normal mode rejection 2 200 plc 3 33 s 4 s 105 dB 191 100 plc 1 67 s 2 s 100 dB 20 plc 333 ms 400 ms 95 dB 18 10 plc 167 ms 200 ms 90 dB 2 plc 33 3 ms 40 ms 85 dB 1 plc 16 7 ms 20 ms 60 dB lt 1 plc 0 dB 1 For 1 unbalance in LO lead 2 For power line frequency 0 08 For power line frequency 1 use 75 dB or 2 5 use 60 dB 32 34980A Service Guide Internal DMM Measurement Characteristics continued 1 2 3 5 34980A Service Guide DC Operating Characteristics u Specifications 2 Function Digits 2 Readings Additional RMS Noise Error Devl DCI and Resistance lt 10 6 0 6 0 5 0 of range 6 6 5
130. ters Store recall menu allows you to save and recall up to six instrument setups Control keys directly control module actions Number keypad enters numerical characters 3 4 5 6 Exponent 7 Cancel key exits a menu without saving changes 8 Arrow keys move cursor positions 9 Knob enters alphanumeric characters selects slots channels and navigates menus 10 Enter key steps you through a menu or saves number entries 11 Running a program puts the display into remote and disables the front panel keys Local takes you out of remote mode and enables the front panel keys 12 Configure keys select functions and set function parameters 13 Measure keys execute and monitor measurements Depending on which measurement key you use you can have complete direct control over the switching and measurement operation or you can have the 34980A automatically control these to capture the desired data 34980A Service Guide iv MN lt lt WN m N Rear Panel at a Glance 2 3 4 5 e SLOT COVER i cmo A Je ut Je n j olL c Er SLOT COVER SLOT COVER H 1 SLOT COVER SLOT COVER z j SLOT COVE
131. the interface specific errors the errors in the global error queue are retrieved Errors are cleared as you read them When you have read all errors from the interface specific and global error queues the ERROR annunciator turns off and the errors are cleared If more than 20 errors have occurred the last error stored in the queue the most recent error is replaced with 350 Error queue overflow No additional errors are stored until you remove errors from the queue If no errors have occurred when you read the error queue the instrument responds with 0 No error The front panel reports errors from all I O sessions as well as the global error queue To read the error queue from the front panel use the View key Error conditions are also summarized in the Status Byte Register For more information on the SCPI Status System for the Agilent 34980A see Status System Introduction The interface specific and global error queues are cleared by the CLS Clear Status command and when power is cycled The errors are also cleared when you read the error queue The error queue is not cleared by a Factory Reset RST command or an Instrument Preset SYSTem PRESet command 34980A Service Guide Troubleshooting and Diagnostics 4 Front Panel Operation If the ERROR annunciator is on press View to view the errors Use the knob to scroll through the error numbers Press gt to view the text of the error message Press gt
132. the cable Be sure to use a copper wire and allow enough time for the residual thermal offset to stabilize usually about 1 minute 4 Connect the input cable to the calibrator output and set the calibrator to output 10V Allow enough settling time for any thermal offset voltages to stabilize usually about 1 minute 5 Perform a 10V dc gain calibration 6 Send an adjustment to the instrument The adjustment value is the sum of the calibrator output and the measured offset from step 3 For example if the calibrator output is 10 001 volts and the measured offset is 10 uV send the value 10 001010 volts When the adjustment finishes verify that new readings fall within 20 uV of the calibrator output plus the offset 7 Reverse the cable connections to the calibrator to create a 10 Vdc voltage standard You must physically reverse the cables DO NOT switch the output polarity of the calibrator 8 Perform a 10V DC gain calibration Be sure to allow time for thermal offsets to stabilize usually about 1 minute 9 Send an adjustment to the instrument The adjustment value is the sum of the calibrator output and the measured offset from step 3 Using the previous example values enter 10 uV minus 10 001 volts or 10 000990 volts 10 When the adjustment finishes verify that new readings fall within 30 uV of the calibrator output minus the offset 34980A Service Guide 65 3 Plug in Modules 66 Calibration Procedures
133. tifunction Switch Measure Unit Service Guide wie Agilent Technologies Notices Agilent Technologies Inc 2006 2011 2012 2013 No part of this manual may be reproduced in any form or by any means including electronic storage and retrieval or transla tion into a foreign language without prior agreement and written consent from Agilent Technologies Inc as governed by United States and international copy right laws Manual Part Number 34980 90010 Edition Sixth Edition September 2013 Printed in Malaysia Agilent Technologies Inc 3501 Stevens Creek Blvd Santa Clara CA 95052 USA Microsoft and Windows are U S regis tered trademarks of Microsoft Corpora tion Software Revision This guide is valid for the firmware that was installed in the instrument at the time of manufacture However upgrading the firmware may add or change product features For the latest firmware and documentation go to the product page at www agilent com find 34980A Warranty The material contained in this doc ument is provided as is and is subject to being changed without notice in future editions Further to the maximum extent permitted by applicable law Agilent disclaims all warranties either express or implied with regard to this manual and any information contained herein including but not limited to the implied warranties of mer chantability and fitness for a par ticular purpose Agilent shall not b
134. tion message may contain up to 40 characters Remote Interface Commands CALibration STRing lt string gt lt slot gt MAINframe DMM CALibration STRing lt slot gt MAINframe DMM Calibration Count You can query the mainframe the DMM the 34951A 4 Ch Isolated DAC Module and 34952A Multifunction Module to determine how many calibrations have been performed Note that your instrument was calibrated before it left the factory When you receive your instrument be sure to read the count to determine its initial value The calibration count increments up to a maximum of 232 after which it rolls over to 0 Since the value increments by one for each calibration point a complete calibration may increase the value by many counts The calibration count is also incremented with calibrations of the 34951A 4 Ch DAC and DAC channels on the 34952A multifunction module Remote Interface Command CALibration COUNt lt slot gt MAINframe DMM 34980A Service Guide Calibration Procedures 3 Calibration Process The following general procedure is the recommended method to complete a full instrument calibration 1 Read DMM Test Considerations on page 53 and Plug in Module Test Considerations on page 65 Perform the verification tests to characterize the instrument incoming data Unsecure the instrument for calibration Calibration Security on page 47 Perform the DMM adjustment procedures
135. tions and Characteristics 22 34952A Multifunction Module Specifications and Characteristics 24 34959A Breadboard Module Specifications and Characteristics 25 Internal DMM Specifications and Characteristics 26 Typical System Speeds 29 Internal DMM Measurement Characteristics 31 System Specifications and Characteristics 34 Product Dimensions 36 To Calculate Total DMM Measurement Error 37 Interpreting Internal DMM Specifications 39 Configuring for Highest Accuracy Measurements 41 E Agilent Technologies 2 Specifications Multiplexer Module Specifications and Characteristics 34921A 34922A 34923A 34924A 34925A Channels configurations 40 2 wire 702 wire 80 1 wire 70 2 wire 80 1 wire 20 4 wire 35 4 wire 40 2 wire 35 4 wire 40 2 wire 4 current 20 4 wire 20 4 wire 1 5 A Fused Switch type Armature Armature Reed Reed Optically isolated latching latching FET Input characteristics per channel Max volts x300Vl 300 Vl 150 V peak 2 150 V peak 2 80 V peak 2 Max current DC RMS Switch current 1A 1A 0 5 0 05 1 0 5 51 0 05 0 02 ASI Carry current 2A 2A 1 5 Al 0 05 AP 1 5 All70 05 ADI Power W VA Pl 60 W 60 W 10 W 10 W 1 6 W Volt Hertz limit 108 108 108 108 107 Initial closed channel res 110 lt 15 150 15001720 09 15001 90 Q 7000 General specifications Offset voltage 8 3yV 3yV lt 50 uV lt 50 uV 3yV lt 100 uV 1 wire DC Isolation ch ch ch earth gt 10 GQ gt 10 G
136. ur spec 1 5 instrument 24 hour spec 1 5 instrument 24 hour spec 0 0010 resolution 1 Optional test if not using relay cycle count 34980A Service Guide Calibration Procedures 3 Calibration Security This feature allows you to enter a security code to prevent accidental or unauthorized adjustments of the instrument When you first receive your instrument it is secured Before you can adjust the instrument you must unsecure it by entering the correct security code If you forget your security code you can disable the security feature by following the procedure below The security code is set to AT34980 when the instrument is shipped from the factory The security code is stored in non volatile memory and does not change when power has been off after a Factory Reset RST command or after an Instrument Preset SYSTem PRESet command The security code may contain up to 12 alphanumeric characters The first character must be a letter but the remaining characters can be letters numbers or an underscore _ You do not have to use all 12 characters but the first character must always be a letter The 34951A 4 Channel DAC has two modes of adjustment based upon the setting of the calibration security feature Additional details are described in 34951A 4 Ch Isolated DAC Module on page 66 Use the CALibration SECure STATe lt mode gt lt code gt command to secure or unsecure the instrument Refe
137. ved Module hardware missing stop bit Module hardware data overrun Module hardware protocol violation Module hardware early end of data Module hardware missing end of data Module hardware module SRQ signal stuck low Module hardware not responding Module reported an unknown module type Module reported command buffer overflow Module reported command syntax error Module reported nonvolatile memory fault Module reported temperature sensor fault Module reported firmware defect Firmware update required www agilent com find 34980A Updates Module reported overvoltage Module reported that maximum number of switches are closed Module reported that switch is missing Module reported that FPGA update failed Module reported that its boot test failed Module reported error byte containing unknown error s DAC Module reported no trace assigned to channel Module reported trace download failed Module does not support trace Invalid width for digital channel Trace does not exist Module reported ABus safety interlock activated Module reported overtemperature Module backplane error Backplane module transaction failed Safety Interlock prevents completion of this command Check Terminal connection Revision mismatch between module firmware and FPGA Backplane interrupt line stuck asserted service disabled 34980A Service Guide 34980A Service Guide Error 935 93
138. y understood and met WARNING A WARNING notice denotes a hazard It calls attention to an operating procedure practice or the like that if not correctly performed or adhered to could result in personal injury or death Do not proceed beyond a WARNING notice until the indi cated conditions are fully understood and met Additional Safety Notices The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings or instructions else where in this manual violates safety stan dards of design manufacture and intended use of the instrument Agilent Technologies assumes no liability of the customer s failure to comply with the requirements General Do not use this products in any manner not specified by the manufacturer The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions Before Applying Power Verify that all safety precautions are taken Make all connections to the unit before applying power Ground the Instrument This product is provided with protective earth terminals To minimize shock haz ard the instrument must be connected to the ac power mains through a grounded power cable with the ground wire firmly connected to an electrical ground safety ground at the power outlet Any interrup tion of the protective groun

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