Agilent Technologies 34937A User's Manual
Contents
1. 15 Agilent 34937A 34939A General Purpose Switch Modules User s Guide vi Agilent 34937A 34939A General Purpose Switch Modules User s Guide General Purpose Switch Modules General Purpose Switch Modules This User s Guide covers the following two plug in modules for the Agilent 34980A Multifunction Switch Measure Unit 34937A 28 channel Form C and 4 channel Form A 34938A 28 channel b amp Form 34939A 64 Channel High Density Form A e The 349374 provides independent control of 32 relays including Twenty eight Form C relays each rated for 1 A at 60 W per channel Four Form A SPST relays each rated for 5 A at 150 W per channel e The 34938A for power switching applications offers 20 Form A relays each rated for 5 A at 150 W per channel The 34939A provides independent control of 64 Form relays each rated for 1 A at 60 W per channel All three modules utilize armature latching relays You can use these general purpose switches in your 34980A mainframe for device actuation digital output signal routing or combined with other switch modules to create flexible switching topologies You can close multiple channels at the same time These modules do not connect to the 34980A s analog buses Agilent 34937A 34939A General Purpose Switch Modules User s Guide 1 Operating Considerations Operating Considerations WARNING Do not connect either the 342. In 2 Electrical Considerations 2 Temperature qaqaqa 2 Switching Reactive sse 2 Hardware Power Fail Jumper 2 34937A 34938A and 34939A SCPI Programming Examples 4 Opening and Closing Channels 4 Reading Jumper State and System Identity 4 Reading Cycle Count and Resetting Modules to Power On State 5 34937A 32 Channel GP Switch Module 6 34937A Simplified Schematic 6 34937A D Sub Connectors 0 00 ccc cence e 7 34937T Terminal Block 8 34938A 20 Channel High Current GP Switch Module 9 34938A Simplified Schematic 9 34938A D Sub Connectors 0 0 ee RR 10 34938T Terminal Block 11 34939A 64 Channel High Density Form A GP Switch Module 12 34939A Simplified Schematic 12 34939A D Sub Connectors 0 ccc cece ee RI 13 34939T Terminal Block
3. Bank2 1 For orientation the D sub connector end of the module is facing you 6NO 6C 1NO 1C 7NO 7C 2NO 2C 3NO 3C 9NO 9C 4NO 4C 5NO 5C NC O90000009090090090 GND 6NO 6C 7NO 7C 8NO 8C 8NO 8C 9NO 9C 4NO 4C 10NO 10C 10NO 10C G amp 9 9 9 9 9 9 9 9 9 9 50 Pin D Sub Male Connector 1NO 3 3NO 25 5NO 31 7NO 37 9NO 43 1Common 4 3Common 26 5Common 32 7Common 38 9Common 44 1NO 19 4NO 13 6NO 1 8NO 39 10NO 47 1Common 20 4Common 14 6Common 2 8Common 40 10Common 48 2NO 7 4NO 29 6NO 35 8NO 41 10NO 49 2Common 8 4Common 30 6Common 36 8Common 42 10Common 50 2NO 23 4NO 45 7NO 5 9NO 11 Reserved 18 2Common 24 4Common 46 7Common 6 9Common 12 GND 33 3NO 9 5NO 15 7NO 21 9NO 27 GND 34 3Common 10 5Common 16 7Common 22 9Common 28 No Connect 17 Bank 2 16NO 16C 11NO 11C 17NO 17C 12NO 12C 13NO 13C 19NO 19C 14NO 14C 15NO 15C NC GND 16NO 16C 17NO 17C 18NO 18C 18NO 18C 19NO 19C 14NO 14C 20NO 20C 20NO 20C G9 50 Pin D Sub Male Connector 11NO 3 13 0 25 15 0 31 1 NO 37 19NO 43 11Common 4 13Common 26 15Common 32 17Common 38 19Common 44 11NO 19 14NO 13 16NO 1 18
4. 0 39 20NO 47 11Common 20 14Common 14 16Common 2 18Common 40 20Common 48 1230 7 1430 29 1630 35 18NO 41 20NO 49 12Common 8 14Common 30 16Common 36 18Common 42 20Common 50 1230 23 1430 45 17NO 5 19NO 11 Reserved 18 12Common 24 14Common 46 17Common 6 19Common 12 GND 33 13 0 9 15 0 15 17NO 21 19NO 27 GND 34 13Common 10 15Common 16 17Common 22 19Common 28 No Connect 17 10 Agilent 34937A 34939A General Purpose Switch Modules User s Guide 34938A 20 Channel High Current GP Switch Module 34938T Terminal Block This terminal block with screw type connections is labeled with the model number and the abbreviated module name In addition space is available on the label for you to write the slot number The 34980A Product Reference CD shipped with the instrument contains a 34938T Wiring Log for you to document your wiring configuration for this module You can open the wiring log file in Microsoft Excel or Adobe Acrobat format DN oooooooooood OOOOOOOO00000 Ib No c mn C ed er SPEED POWER CONSIDERATIONS QI Wire Size 20 AWG Typical 18 AWG Max Pads for user supplied snubber circuity to alleviate reactive transients The circuits may consist of resistors capacitors varistors or other elements as needed to reduce the switching voltage and current transi
5. 1 2 Maintain 3 3 Power Down State Agilent 34937A 34939A General Purpose Switch Modules User s Guide 3 34937A 34938A and 34939A SCPI Programming Examples 34937A 34938A and 34939A SCPI Programming Examples The programming examples below provide you with SCPI command examples to use for actions specific to the general purpose switch modules The slot and channel addressing scheme used in these examples follow the form scec where s is the mainframe slot number 1 through 8 and ccc is the channel number For complete information on the SCPI commands used to program the 34980A and for example programs refer to the Agilent 34980A Programmer s Reference contained on the 34980A Product Reference CD Opening and Closing Channels Example Closing and opening channels first two commands close channel 3 for a module in slot 2 then channel 5 for that module The last command opens both channel 3 and channel 5 ROUTe CLOSe 2003 ROUTe CLOSe 2005 ROUTe OPEN 2003 2005 Example Querying channels for open or closed state The following command returns a 1 true or 0 false state of channel 016 for a module in slot 3 ROUTe CLOSe 3016 ROUTe CLOSe 3016 Returns a 1 ROUTe OPEN 3016 Returns a 0 Reading Jumper State and System Identity Example Querying the power failure state of 5Arelays The following command returns the position of the power fail jumper either MAIN all relays maintain their
6. 3 NC 38 6 NC 49 9 NC 44 12 NC 39 29 NO 1 3 Common 21 6 Common 32 9 Common 27 12 Common 22 29 Common 2 3 NO 4 6 NO 50 9NO 10 12 NO 5 Bank 2 31NO 31C 21NO 17NO 26NO 22NO 18NO 15NO 27NO 23NO 19NO 16NO 28NO 24NO 32NO 32C NC GND 25NO 25NC 21NC 17NC 26NC 22NC 18NC 15NC 27NC 23NC 19NC 16NC 28NC 24NC 20NC 20NO 50 Pin D Sub Male Connector 15 NC 18 NC 21 NC 24NC 27 NC 32 NO 15 Common 18 Common 21 Common 24 Common 27 Common 32 Common 15 NO 18 NO 21 NO 24 NO 27 NO Reserved 16 NC 19 NC 22 NC 25 NC 28 NC GND 16 Common 19 Common 22 Common 25 Common 28 Common GND 16 NO 19 NO 22 NO 25 NO 28 NO No Connect 17 NC 20 NC 23 NC 26 NC 31 NO 17 Common 21 20 Common 32 23 27 26 22 31 Common 2 17 NO 4 20 NO 50 23 NO 10 26 NO 5 Agilent 34937A 34939A General Purpose Switch Modules User s Guide 7 34937A 32 Channel GP Switch Module 34937T Terminal Block This terminal block with screw type connections is labeled with the model number and the abbreviated module name In addition space is available on the label for you to write the slot number The 34980A Product Reference CD shipped with the instrument contains a 34937T Wiring Log for you to document your wiring configuration for this module You can open the wiring log file in Microsoft Ex
7. or loss of important data Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met A WARNING 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 personal injury or death Do not proceed beyond a WARNING notice until the indicated condi tions are fully understood and met Agilent 34937A 34939A General Purpose Switch Modules User s Guide Additional Safety Notices The following general safety precautions must be observed during all phases of oper ation of this instrument Failure to comply with these precautions or with specific warnings or instructions elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Agilent Technologies assumes no liability of the customer s failure to com ply with the requirements General Do not use this products in any manner not specified by the manufacturer The protec tive features of this product may be impaired if it is used in a manner not speci fied 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 hazard the instrument must be connected to the ac power mains
8. through a grounded power cable with the ground wire firmly con nected to an electrical ground safety ground at the power outlet Any interrup tion of the protective grounding conduc tor or disconnection of the protective earth terminal will cause a potential shock haz ard 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 instrument cover Do Not Modify the Instrument Do not install substitute parts or perform any unauthorized modification to the prod uct 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 defec tive should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel Safety Symbols Alternating current NS dh 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 description O AN Agilent 34937A 34939A General Purpose Switch Mo
9. 38A 10 34939A 13 D D sub pinouts 34937A 7 34938A 10 34939A 13 J jumper 2 P pinouts 34937A 7 34938A 10 34939 13 power fail jumper 2 programming examples 4 T temperature sensor 2 Agilent 34937A 34939A General Purpose Switch Modules User s Guide Index 17 Index 18 Agilent 34937A 34939A General Purpose Switch Modules User s Guide
10. 4C 14NO 17C 17NO 20C 20NO 23C 23NO 26C 26NO 29C 29NO NC e 0000000000000000080 1C 1NO 2C 2NO NC NC NC GND Res NC NC NC NC 32C 32NO 31C 31NO 9G 6 6 9 6 78 Pin D Sub Male Connector 1NO 8 NO 15 NO 22 NO 29 NO No Connect 1 Common 8 Common 15 Common 22 Common 29 Common No Connect 2 NO 9 NO 16 NO 23 NO 30 NO No Connect 2 Common 9 Common 16 Common 23 Common 30 Common No Connect 3 NO 10 NO 17 NO 24 NO 31 NO No Connect 3 Common 10 Common 17 Common 24 Common 31 Common No Connect 4 NO 11 NO 18 NO 25 NO 32 NO Chassis GND 4 Common 11 Common 18 Common 25 Common 32 Common Reserved 5 NO 12 NO 19 NO 26 NO No Connect 5 Common 12 Common 19 Common 26 Common No Connect 6 NO 13 NO 20 NO 27 NO No Connect 6 Common 23 13 Common 7 20 Common 51 27 Common 17 No Connect 60 7 NO 4 14 NO 48 21 NO 14 28 NO 38 No Connect 65 7 Common 3 14 Common 47 21 Common 13 28 Common 37 No Connect 66 Agilent 34937A 34939A General Purpose Switch Modules User s Guide 13 34939A 64 Channel High Density Form A GP Switch Module Bank 2 o Bank1 Bank 2 o For orientation the D sub connector end of the module is facing you 58C 58NO 61C 61NO 52C 52NO 55C 55NO 46C 46NO 48C 48NO 39C 39NO 42C 42NO 33C 33NO 36C 36NO O 9 9 9 O 9 9 O 57C 57NO 60C 60NO 51C 51NO 54C 54NO 45C 45NO 49C 49
11. 937A 34938A or 34939A module directly to a mains power outlet If it is necessary to switch a mains voltage or any circuit where a large inductive load may be switched you must add signal conditioning elements to reduce the potential transients before they reach the module or the Analog Buses Electrical Considerations See the Introduction to the Plug In Modules chapter of the 34980A Mainframe User s Guide for detailed environmental operating conditions for the 34980A mainframe and its installed modules That guidance sets maximum per channel current and power ratings at rated voltage for pollution degree 1 dry and pollution degree 2 possible condensation conditions for each of the GP modules Temperature Sensor A temperature sensor on these modules triggers system interrupts when high carry current induced heat on the modules is excessive and sets the HOT annunciator on the front panel This over temperature situation generates an SRQ event when the factory set 70 C threshold is reached It is up to the user to determine what if any action should be taken Switching Reactive Loads Reactive loads those that include significant inductance or capacitance can cause voltage spikes or current spikes during switching operations The general purpose modules are designed for switching reactive loads The optional 34937T and 34938T terminal blocks have solder pads for adding snubber circuits for the 5 A relays to reduce the reac
12. Agilent 34937A 34939A General Purpose Switch Modules User s Guide Agilent Technologies Inc Printed in Malaysia Edition 1 June 2008 E0608 34980 90037 34980 90037 RE Agilent Technologies Notices Agilent Technologies Inc 2008 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 90037 Edition First Edition June 2008 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 Corporation 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 docu ment is provided as is and is sub ject to being changed without notice in future editions Further to the max imum 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
13. NO 40C 40NO 43C 43NO 34C 34NO NC 9 NC 59 59NO 62C 62NO 53C 53NO 56C 56NO 47C 47NO 50C 50NO 41C 41NO 44C 44NO 35C 35NO NC OOOOH OOO amp NC 63 63NO 64C 64NO NC NC NC GND Res NC NC NC NC NC 38C 38NO 37C 37NO OOOHOOOHOOOOOOOQOODO 78 Pin D Sub Male Connectoi Channel Pim Bescripton Pin J Description Pim Description Pin_ Description Pin_ Description Pin 33 NO 18 40 NO 34 47 NO 50 54 NO 28 61 NO 4 No Connect 67 33 Common 17 40 Common 33 47 Common 49 54 Common 27 61 3 No Connect 70 34 NO 41 NO 48 NO 55 NO 8 62 NO No Connect 34 Common 41 Common 48 Common 55 Common 62 Common No Connect 35 NO 42 NO 49 NO 56 NO 63 NO No Connect 35 Common 42 Common 49 Common 56 Common 63 Common No Connect 36 NO 43 NO 50 NO 57 NO 64 NO Chassis GND 36 Common 43 Common 50 Common 57 Common 64 Common Reserved 37 NO 44 NO 51 NO 58 NO No Connect 37 Common 44 Common 51 Common 58 Common No Connect 38 NO 45 NO 52 NO 59 NO No Connect 38 Common 45 Common 52 Common 59 Common No Connect 39 NO 46 NO 53 NO 60 NO No Connect 39 Common 46 Common 53 Common 60 Common No Connect 14 Agilent 34937A 34939A General Purpose Switch Modules User s Guide 34939A 64 Channel High Density Form A GP Switch Module 34939T Terminal Block This terminal block with screw type connections is labeled with the model number and t
14. cel or Adobe Acrobat format Lo IO6OOOOQOOOOOQOO OOOOOO0000000 cj d NO C no no C NC NO C NC NO C NC NO NC 17 18 19 20 O ooooooooooooQ0 No nc NC C NC wo 2 Nc No C NC J NO C NC NO C NC Wire Size O Pads for user supplied snubber 20 AWG Typical circuity to alleviate reactive 18 AWG Max transients The circuits may consist of resistors capacitors varistors or other elements as needed to reduce the switching voltage and current transients inherent in reactive circuits 8 Agilent 34937A 34939A General Purpose Switch Mlodules User s Guide 34938A 20 Channel High Current GP Switch Module 34938A 20 Channel High Current GP Switch Module The 34938A high current GP switch module provides twenty 5 A Form A SPST relays for general purpose switching needs You can set the power failure state for these 5 A relays see Hardware Power Fail Jumper on page 2 A temperature sensor on these modules triggers system interrupts when high carry current induced heat on the modules reaches a threshold of 70 C See description of the HOT annunciator on page 2 34938A Simplified Schematic NO o Channel 001 5A Form A COM e e e Channel 020 5A Form A COM Agilent 34937A 34939A General Purpose Switch Modules User s Guide 9 34938A 20 Channel High Current GP Switch Module 34938A D Sub Connectors Bank1
15. dule provides independent control of Twenty eight Form C SPDT latching relays rated at 1 A Four Form A SPST latching relays rated at 5 A You can set the power failure state for these 5 A relays see Hardware Power Fail Jumper on page 2 A temperature sensor on these modules triggers system interrupts when high carry current induced heat on the modules reaches a threshold of 70 C See description of the HOT annunciator on page 2 34937A Simplified Schematic NC Channel 001 1 e e e NC Channel 028 1 Form COM NO o COM NO o COM Channel 029 5A Form A Channel 032 5A Form A Agilent 34937A 34939A General Purpose Switch Modules User s Guide 34937A 32 Channel GP Switch Module 34937A D Sub Connectors o Bank 1 Bank 2 Bank 1 For orientation the D sub connector end of the module is facing you 29NO 29C 7NO 12NO 8NO 4NO 1NO 13NO 9NO 5NO 2NO 14NO 10NO 30NO 30C NC 0900000099099099090 GND 11NO 11NC 7NC 12NC 8NC 4NC 1NC 13NC 9NC 5NC 2NC 14NC 10NC 6NC 6NO OO 9 9 9 9 9 9 9 9 9 2 1 NC 1 Common 4 Common 7 Common 10 Common 13 Common 30 Common 1NO 4 NO 7 NO 10 NO 13 NO Reserved 2 NC 5 NC 8 NC 11 NC 14 NC GND Common 2 NO 12 5 NO 11 8NO 6 11 NO 35 14 NO 13 No Connect 17
16. dules User s Guide 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 discard this electrical 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 instrumentation 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 shipment 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 The Declaration of Conformity DoC for the 34980A mainframe instrument can be found on page iii in the 34980A Mainframe User s Guide That DoC applies to the 34980A mainframe and all available plug in modules Agilent 34937A 34939A General Purpose Switch Modules User s Guide Contents General Purpose Switch Modules 1 Operating Considerations
17. ents inherent in reactive circuits Agilent 34937A 34939A General Purpose Switch Modules User s Guide 11 34939A 64 Channel High Density Form A GP Switch Module 34939A 64 Channel High Density Form A GP Switch Module The 34939A high density GP switch module provides sixty four 1 A Form A SPST relays for general purpose switching needs You can set the power failure state for these relays see Hardware Power Fail Jumper on page 2 A temperature sensor on these modules triggers system interrupts when high carry current induced heat on the modules reaches a threshold of 70 C See description of the HOT annunciator on page 2 34939A Simplified Schematic NO o Channel 001 1A Form A COM e e e 064 1 COM 12 Agilent 34937A 34939A General Purpose Switch Modules User s Guide 34939A D Sub Connectors NC Channel Pin Bescrip am Pin Tescriion Pin J Desorption Pim Bescrinton Pin_ Descrnton Pin Bank 1 34939A 64 Channel High Density Form A GP Switch Module o Bank 1 Bank 2 o For orientation the D sub connector end of the module is facing you 4C 4NO 7C 7NO 10C 10NO 13C 13NO 16C 16NO 18C 18NO 21C 21NO 24C 24NO 27C 27NO 30C 30NO 3C 3NO 6C 6NO 9C 9NO 12C 12NO 15C 15NO 19C 19NO 22C 22NO 25C 25NO 28C 28NO NC NC 5 5NO 8C 8NO 11C 11NO 1
18. he abbreviated module name In addition space is available on the label for you to write the slot number The 34980A Product Reference CD shipped with the instrument contains a 34939T Wiring Log for you to document your wiring configuration for this module You can open the wiring log file in Microsoft Excel or Adobe Acrobat format 220000000000 lew 33 22202202228 35 36 37 38 C NO C NO C NO C NO C NO C NO No c No 300000000000 40 41 42 43 44 oooooooooooOo Wire Size 20 AWG Typical 18 AWG Max 200000000000 Agilent 34937A 34939A General Purpose Switch Modules User s Guide 15 34939A 64 Channel High Density Form A GP Switch Module 16 Agilent 34937A 34939A General Purpose Switch Modules User s Guide Index Numerics W 34929A warranty ii pinouts 13 34937A connector pinouts 7 description 1 6 simplified schematic 6 snubber circuitry 8 terminal block 8 wiring log 8 34938A connector pinouts 10 description 1 9 simplified schematic 9 snubber circuitry 11 terminal block 11 wiring log 11 34939A connector pinouts 13 description 1 12 simplified schematic 12 terminal block 15 wiring log 15 C connector pinouts 34937A 7 349
19. limited to the implied warranties of merchantability and fitness for a par ticular purpose Agilent shall not be liable for errors or for incidental or consequential damages in connection with the furnishing use or perfor mance of this document or of any information contained herein Should Agilent and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms the warranty terms in the sep arate 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 Software and technical data pursuant to FAR 12 211 Technical Data and 12 212 Computer Software and for the Department of Defense DFARS 252 227 7015 Technical Data Commercial Items and DFARS 227 7202 3 Rights in Commercial Com puter Software or Computer Software Documentation Safety Notices CAUTION A CAUTION notice denotes a haz ard It calls attention to an operat ing procedure practice or the like that if not correctly performed or adhered to could result in damage to the product
20. present state when power fails or OPEN all relays open when power fails for a module in slot 4 If this command is sent to a module other than the 34937A or 34938A NONE is returned no error is generated In particular the position of the power fail jumper on the 34939A module cannot be queried using this commmand SYSTem MODule PFAil JUMPer AMP5 4 Example Querying the system for module identify all modules The following command returns the identify of the module installed in slot 7 SYSTem CTYPe 7 4 Agilent 34937A 34939A General Purpose Switch Modules User s Guide 34937A 34938A and 34939A SCPI Programming Examples Reading Cycle Count and Resetting Modules to Power On State Example Reading the cycle count for a relay all switch modules The following command returns the relay cycle count on channel 7 and channel 16 for a module in slot 1 DIAGnostic RELay CYCLes 1007 1016 Example Clearing the cycle count for a relay all switch modules The following command resets the relay cycle count on channels 7 and 16 for a module in slot 1 DIAGnostic RELay CYCLes CLEar 1007 1016 Example Resetting Module s to power on state all modules The following command resets a module in slot 4 to its power on state SYSTem CPON 4 Agilent 34937A 34939A General Purpose Switch Modules User s Guide 5 34937A 32 Channel GP Switch Module 34937 32 Channel GP Switch Module The 34937A general purpose switch mo
21. tive transients See the drawings on page 8 and page 11 for the locations of snubber circuit pads and installation information about a snubber circuit Hardware Power Fail Jumper A hardware jumper on the 34937A and 34938A modules allows you to define the power failure states for the modules 5 A latching relays Depending on the position of the jumper the 5 A relays will either open or maintain state when system power failure occurs On the 34939A module a hardware jumper allows you to define the power failure state affecting all 64 of the module s 1 A latching relays Depending on the position of the jumper these relays will either open or maintain state when system power failure occurs 2 Agilent 34937A 34939A General Purpose Switch Modules User s Guide Operating Considerations The jumpers are positionable across pins 1 2 Open position or across pins 2 3 Maintain position When shipped from the factory the power fail jumper is in the Maintain position i e all relays maintain their present state when power fails WARNING Before changing the position of the jumper remove external connections from the module Wait five to ten seconds to allow the module s internal capacitors to discharge After a five to ten second delay remove the sheet metal cover from the module and move the position of the jumper mounted on the module See the figure below for the jumper s location on the module oven
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