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Chapter 4

Understanding the Strain Gage Multiplexers

About This Chapter

This chapter describes the strain measurement procedure used by the
examples in Chapter 3, and also describes the measurement circuitry
associated with

1

⁄

4

,

1

⁄

2

, and full bridge measurements. The sections of this

chapter are:

•

Making Strain Measurements . . . . . . . . . . . . . . . . . . . . . . . . Page 49

•

Strain Gage Multiplexer Block Diagrams . . . . . . . . . . . . . . . Page 52

•

Understanding the Strain Gage Measurement
Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 53

•

Understanding the Bridge Configurations . . . . . . . . . . . . . . . Page 58

•

Measurements Using an External Voltmeter. . . . . . . . . . . . . Page 63

•

Voltage and Resistance Measurements . . . . . . . . . . . . . . . . . Page 64

Making Strain Measurements

This section explains the procedure used to make strain measurements.
Also covered are the equations (in the instrument firmware) which calculate
the measured strain.

Strain

Measurement

Procedure

The procedure for making strain measurements with the HP E1355A -
E1358A Strain Gage Multiplexers and HP E1326B/E1411B Multimeter is:

1. Specify the Gage Factor and, for Poisson configurations, the Poisson

Ratio.

STRain:GFACtor

gage_factor

,(@

channel_list

)

STRain:POISson

poisson_ratio

,(@

channel_list

)

One gage_factor and poisson_ratio (Poisson configurations) must be
specified for each channel.

2. Measure the unstrained reference voltage.

CALibration:STRain (@

channel_list

)

One unstrained reference voltage measurement must be made on
each channel. Note that this command leaves the HP
E1326B/E1411B Multimeter configured for an unstrained reference
voltage measurement. The multimeter must be reconfigured to make
the strain measurement (Step 4).

Chapter 4

Understanding the Strain Gage Multiplexers 49

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Summary of Contents for HP E1355A

Page 1: ...l service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE INSPECTION Remotely inspect equipment before purchasing with our interactive website at www instraview com LOOKING FOR MORE INFORMATION Visit us on the web at www artisantg com for more information on ...

Page 2: ...nstrument Addressing 21 Connecting the Multiplexers 22 Chapter 2 Connecting Strain Gages to the Multiplexers 23 About This Chapter 23 Terminal Module Configuration 23 Bridge Selection Jumpers 24 Bridge Excitation Voltage Terminals 24 Bridge Completion Channels 25 Bridge Wiring Diagrams 25 H L G Voltmeter Terminals 25 Wiring a Terminal Module 26 Strain Gage Wiring Diagrams 27 Wiring Considerations ...

Page 3: ...Strain Measurement Equations 52 Strain Gage Multiplexer Block Diagrams 52 Block Diagram Description 53 Understanding the Strain Gage Measurement Circuits 53 The Wheatstone Bridge 54 The Chevron Bridge 56 The Wagner Ground 57 Understanding the Bridge Configurations 58 1 4 Bridge Measurements QUARter 58 1 2 Bridge Measurements 59 Full Bridge Measurements 61 Measurements Using an External Voltmeter 6...

Page 4: ...IME 87 SENSe 88 STRain GFACtor 88 STRain GFACtor 89 STRain POISson 89 STRain POISson 89 STRain UNSTrained 90 STRain UNSTrained 90 STATus 91 OPERation ENABle 91 OPERation EVENt 91 SYSTem 92 CDEScription 92 CPON 93 CTYPe 93 ERRor 94 TRIGger 95 IMMediate 95 SOURce 95 SOURce 97 IEEE 488 2 Common Commands 98 Command Quick Reference 99 HP E1355A 56A 57A 58A Modules User s Manual Contents 3 Artisan Techn...

Page 5: ...mand Module or Mainframe 122 Register Offset 122 Register Descriptions 123 Relay Multiplexer Registers 123 The READ Registers 123 ID Register 123 Device Type Register 124 Status Register 124 The WRITE Registers 125 Control Register 125 Tree Switch Register 125 Channel Register 125 FET Multiplexer Registers 126 The READ Registers 126 ID Register 126 Device Type Register 127 Status Register 127 Scan...

Page 6: ...ting the Switchbox 135 Measuring the Bridge Excitation Voltage 135 FET Multiplexer Scanning 135 Appendix E Strain Gage Multiplexer Error Messages 137 HP E1355A 56A 57A 58A Modules User s Manual Contents 5 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 7: ...Notes 6 HP E1355A 56A 57A 58A Modules User s Manual Contents Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 8: ...HP does not warrant the Buyer s circuitry or malfunctions of HP products that result from the Buyer s circuitry In addition HP does not warrant any damage that oc curs as a result of the Buyer s circuit or any defects that result from Buyer supplied products NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PU...

Page 9: ... use by service trained personnel only Under certain conditions dangerous voltages may exist even with the equipment switched off To avoid dangerous electrical shock DO NOT perform procedures involving cover or shield removal unless you are qualified to do so DO NOT operate damaged equipment Whenever it is possible that the safety protection features built into this product have been im paired eit...

Page 10: ... 1991 EN50082 1 1992 4kVCD 8kVAD IEC 801 3 1984 EN50082 1 1992 3 V m IEC 801 4 1988 EN50082 1 1992 1kV Power Line Supplementary Information The product herewith complies with the requirements of the Low Voltage Directive 73 23 EEC and the EMC Directive 89 336 EEC and carries the CE marking accordingly Tested in a typical configuration in an HP B Size VXI mainframe European contact Your local Hewle...

Page 11: ...Notes 10 HP E1355A 56A 57A 58A Strain Gage Multiplexer Module User s Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 12: ...e easy to understand O O O O O The documentation is clearly written O O O O O Examples are clear and useful O O O O O Illustrations are clear and helpful O O O O O The documentation meets my overall expectations O O O O O Please write any comments or suggestions below be specific cut along this line fold here Your Name Company Name Job Title Address City State Province Country Zip Postal Code Tele...

Page 13: ...12 HP E1355A 56A 57A 58A Strain Gage Multiplexer Module User s Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 14: ... B size 8 channel 120Ω and 350Ω RELAY Strain Gage Multiplexers respectively The HP E1355A and E1356A terminal modules use the HP E1345 66201 component assembly The relay multiplexers use a single B size or C size mainframe slot The HP E1357A and E1358A are B Size 8 channel 120Ω and 350Ω FET Strain Gage Multiplexers respectively The E1357A and E1358A terminal modules use the HP E1351 66201 componen...

Page 15: ...Module The card ID jumpers and card ID switch Figure 1 1 indicates which terminal assembly is used Since the HP E1345 66201 and HP E1351 66201 assemblies are used with a variety of terminal modules the ID jumpers or ID switch may need to be changed To reduce setup time and avoid configuration errors check the jumper or switch setting to make sure they match the terminal module used Relay Multiplex...

Page 16: ...nt assembly and when the mainframe is turned on Note When the terminal card is not attached the system identifies the multiplexer as an HP E1351A 16 channel FET multiplexer when the card ID switches are in the OPEN 0 position Figure 1 1 Checking the Card ID Jumper Switch Chapter 1 Getting Started with the Strain Gage Multiplexers 15 Artisan Technology Group Quality Instrumentation Guaranteed 888 8...

Page 17: ...he HP E1357A and HP E1358A FET Strain Gage Multiplexers Note Make certain the card ID switch setting matches the terminal card used If they do not match a configuration error may occur or the wrong terminal card may be identified Figure 1 2 Identifying the HP E1357A E1358A 16 Getting Started with the Strain Gage Multiplexers Chapter 1 Artisan Technology Group Quality Instrumentation Guaranteed 888...

Page 18: ...plexers use an interrupt line At the factory the IRQ jumper or switch is set to line 1 Since the system instrument in the Series B mainframe is assigned to each line and the Series C command module E1406A is assigned line 1 by default it is not necessary to change the IRQ jumper switch setting If the command module in Series C systems is assigned another line and the switchbox is to use that line ...

Page 19: ...wever that this signal may not be stable enough or pure enough for some strain measurements CAUTION If jumpers are installed and then the 5V Bridge Excitation is shorted the main fuse on the PC board may blow and reset the mainframe This would set all instruments in the mainframe to their power on state To increase protection install a one amp fuse HP part number 2110 0665 in place of the wire sho...

Page 20: ...tmeter Guidelines for creating a scanning multimeter and switchbox follow Creating a Scanning Multimeter Instrument In a scanning multimeter instrument signals measured by the HP E1326B E1411B Multimeter are input via the multiplexer channels Channel openings and closings are controlled by the multimeter through commands sent to the multimeter To create a scanning multimeter instrument The instrum...

Page 21: ...cessive logical addresses beginning with the logical address of the instrument identifier For example the multiplexers in a switchbox might have logical addresses of 112 113 114 and so on All strain gage multiplexers have a factory set logical address of 112 The logical address is changed using the logical address switches shown in Figure 1 5 Note Detailed information on creating virtual instrumen...

Page 22: ...Thus for a scanning multimeter with an instrument identifier logical address of 24 the secondary address is 03 For a switchbox with an instrument identifier logical address of 112 the secondary address is 14 Multiplexer Card Numbers The multiplexer modules in a scanning multimeter and switchbox instrument assume card numbers within the instrument Figure 1 4 The multiplexer with the lowest logical ...

Page 23: ...instruments the multiplexers are connected to the multimeter and to other multiplexers with an analog bus cable or with an analog bus cable and a digital bus cable Figure 1 6 The cables used are determined as follows 1 If the scanning multimeter or switchbox uses relay strain gage multiplexers only the analog bus cable is used 2 If the scanning multimeter or switchbox uses FET strain gage multiple...

Page 24: ...Page 26 Strain Gage Wiring Diagrams Page 27 Terminal Module Configuration The strain gage terminal module used with each multiplexer accessory is shown in Figures 2 1A and 2 1B The terminal module is used to select the bridge arrangement on each channel supply the bridge excitation voltage external source connect the strain gages to the bridge completion channels Figure 2 1A Terminal Module Config...

Page 25: ...ied the voltage is connected to the Vs terminals on the terminal module The bridge excitation voltage required for each bridge arrangement 1 4 1 2 full and a recommended power supply are found in Table 2 1 Figure 2 1B Terminal Module Configuration 1 4 or 1 2 Bridge Arrangements Voltage Power 8 channels of 120Ω bridge arrangements 5V 200 mA 1 0W 8 channels of 350Ω bridge arrangements 5V 70 mA 0 35W...

Page 26: ... channel terminals The six points on the diagrams E E1 E2 H L and G correspond to the six wiring terminals on each bridge completion channel These points also correspond to the points shown on the Wheatstone Bridge on page 54 The terminals used by the bridge configurations are 1 4 bridge E E1 H G 1 2 bridge E E2 H G full bridge E E2 H L G An example of how the diagram relates to gage wiring is sho...

Page 27: ...Wiring a Terminal Module 26 Connecting Strain Gages to the Multiplexers Chapter 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 28: ...tion also takes advantage of the multiplexer s Wagner Ground see The Wagner Ground on page 57 The Wagner Ground drives the midpoint of the bridge to the same potential as the specimen thus preventing stray leakage currents from affecting measurement accuracy Note that the shield must be connected to the specimen and not the gage Twisting the conductor leads reduces the loop area formed by the Whea...

Page 29: ...grams Figure 2 4 Connecting Strain Gages in 1 4 Bridge Arrangements 28 Connecting Strain Gages to the Multiplexers Chapter 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 30: ...grams Figure 2 5 Connecting Strain Gages in 1 2 Bridge Arrangements Chapter 2 Connecting Strain Gages to the Multiplexers 29 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 31: ...grams Figure 2 6 Connecting Strain Gages in Full Bridge Arrangements 30 Connecting Strain Gages to the Multiplexers Chapter 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 32: ...n External Voltmeter Figure 2 7 Connecting Relay Strain Gage Multiplexers to an External Voltmeter Chapter 2 Connecting Strain Gages to the Multiplexers 31 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 33: ...n External Voltmeter Figure 2 8 Connecting FET Strain Gage Multiplexers to an External Voltmeter 32 Connecting Strain Gages to the Multiplexers Chapter 2 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 34: ...make strain gage measurements and to provide programs that can be used directly in your applications Programming Language The example programs are shown in the HP BASIC language and assume the multimeter is controlled from an HP 9000 Series 300 computer over the HP IB When using HP BASIC a command is sent to the scanning multimeter instrument with the OUTPUT statement OUTPUT 70903 MEAS STR QUAR 10...

Page 35: ...sed Strain Measurement Procedure Strain measurements with the strain gage multiplexers and HP E1326B E1411B multimeter are made as follows 1 Specify the Gage Factor and for Poisson configurations the Poisson Ratio 2 Measure the unstrained reference voltage Vout Vs unstrained 3 Add tension to the specimen 4 Configure the multimeter and make the strain measurement Vout Vs strained Each example in th...

Page 36: ... to the specimen then press Continue PAUSE DISP Measure the strain on the channel Enter and display the reading OUTPUT 70903 MEAS STR QUAR 100 ENTER 70903 Strn_rdg PRINT Strn_rdg END Comments The wiring diagram used for this example is on page 28 Specifying the gage factor as 2 11E 6 returns the strain measurement in microstrain A gage factor must be specified and an unstrained reference must be m...

Page 37: ...PUT 70903 CAL STR 100 102 DISP Add tension to the specimen then press Continue PAUSE DISP Measure the strain on the specified channels Enter and display the readings OUTPUT 70903 MEAS STR QUAR 100 102 ENTER 70903 Strn_rdgs PRINT Strn_rdgs END Comments The wiring diagram used for this example is on page 28 Specifying the gage factor as 2 11E 6 returns the strain measurements in microstrain A gage f...

Page 38: ... format and turn off the mainframe display Configure the multimeter for 1 4 bridge strain measurements on channel 0 To achieve 2000 measurements in 1 second specify a fixed lowest range set the aperture time to accept the necessary sample period turn autozero off specify the number of measurements to be taken and specify the source of the sample signal and the sample period OUTPUT 70903 FORM REAL ...

Page 39: ...eadings 8 bytes reading When HP BASIC is used the program s ENTER Dmm USING statement is used to remove the Arbitrary Block header tells the computer not to terminate the ENTER until all ENTER statements have completed X tells the computer to skip the first character of the Arbitrary Block header K K stores the non zero digit and block length portions of the header in the Ndig and Count variables ...

Page 40: ...NTER 70903 Strn_rdgs E1 Strn_rdgs 1 E2 Strn_rdgs 2 E3 Strn_rdgs 3 Epsilon 5 E1 E3 E1 E3 2 2 E2 E1 E3 2 5 Sigma 10 4 2 E1 E3 1 32 1 1 32 E1 E3 2 2 E2 E1 E3 2 5 Theta 5 ATN 2 E2 E1 E3 E1 E3 PRINT Epsilon PRINT Sigma PRINT Theta END Comments The wiring diagram used for this example is on page 28 A gage factor must be specified and an unstrained reference must be measured for each channel A rosette me...

Page 41: ...Measure the strain on the channel Enter and display the reading OUTPUT 70903 MEAS STR FBEN 107 ENTER 70903 Strn_rdg PRINT Strn_rdg END Comments The wiring diagram used for this example FBENding is on page 30 When making full bridge measurements the channel s bridge selection jumper must be in the FULL position Specifying the gage factor as 2 115E 6 returns the strain measurements in microstrain A ...

Page 42: ...mainframe Event In port to close a channel Connect the analog bus which carries the bridge output and excitation voltages to the HI LO and Guard terminals on the multiplexer terminal module OUTPUT 70914 RST OUTPUT 70914 OUTP ON OUTPUT 70914 TRIG SOUR EXT OUTPUT 70914 SCAN PORT ABUS Download the scan list to measure Vout and Vs unstrained Close the first channel in the list to start the scan OUTPUT...

Page 43: ...ed to compute Vr which in equation form is defined as Vr Vout Vs strained Vout Vs unstrained Vr is then substituted into the equation Table 4 1 for 1 4 bridge measurements The HP E1300 E1301 mainframe s Event In and Trig Out ports are connected to the voltmeter s VM Compl and Ext Trig ports respectively Thus when a multiplexer channel is closed a channel closed pulse from the mainframe s Trig Out ...

Page 44: ...ch carries the bridge output and excitation voltages to the HI LO and Guard terminals on the multiplexer terminal module Set a delay between when the trigger to close a channel is received and when the channel closed trigger is generated This prevents voltmeter triggers from occurring too fast OUTPUT 70914 RST OUTPUT 70914 TRIG SOUR DBUS OUTPUT 70914 SCAN MODE VOLT OUTPUT 70914 SCAN PORT ABUS OUTP...

Page 45: ...uted into the equation Table 4 1 on page 52 for 1 4 bridge measurements The channel closed measurement handshake sequence between the FET multiplexer switchbox and the voltmeter occurs over the multiplexer s digital bus When connected as shown in Figure 2 8 the digital bus cable HP Part Number E1411 80001 connects the multiplexer s channel advance and channel closed pins to the voltmeter s VM Comp...

Page 46: ...erminal module OUTPUT 70914 RST OUTPUT 70914 OUTP ON OUTPUT 70914 TRIG SOUR BUS OUTPUT 70914 SCAN MODE VOLT OUTPUT 70914 SCAN PORT ABUS Measure Vout and Vs unstrained INIT closes the first channel in the list TRG is used to advance and complete the scan The WAIT statements allow the voltmeter measurement to complete before the next channel is closed OUTPUT 70914 SCAN 100 102 115 OUTPUT 70914 INIT ...

Page 47: ... With the specimen in an unstrained state call the subprogram which measures the unstrained references for each channel Store the references in a computer variable CALL Ref_meas Unstr Once the specimen is in a strained state the strain measurements can be made PAUSE Make three sets of strain measurements For each set specify the gage factor download the unstrained references and then measure the s...

Page 48: ...ads the unstrained references prior to the strain measurements SUB Ref_load Unstr FOR I 0 TO 2 OUTPUT 70903 STR UNST Unstr I 100 I NEXT I SUBEND Comments This program makes 1 4 bridge measurements on channels 0 1 and 2 of multiplexer card number 1 The wiring diagram used is on page 28 Since each strain measurement must have an unstrained reference the unstrained references are downloaded prior to ...

Page 49: ...Notes 48 Making Strain Gage Measurements Chapter 3 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 50: ...ch calculate the measured strain Strain Measurement Procedure The procedure for making strain measurements with the HP E1355A E1358A Strain Gage Multiplexers and HP E1326B E1411B Multimeter is 1 Specify the Gage Factor and for Poisson configurations the Poisson Ratio STRain GFACtor gage_factor channel_list STRain POISson poisson_ratio channel_list One gage_factor and poisson_ratio Poisson configur...

Page 51: ...AD or INIT is executed Thus low level multimeter commands covered in the multimeter manual can be used to change the configuration range aperture time before the measurement is made Note The strain measurement commands identified in this procedure are HP E1326B E1411B Multimeter commands Information on how these commands relate to strain measurements and how the multimeter makes strain measurement...

Page 52: ... used with the channel s unstrained reference to determine Vr Note Vs unstrained and Vs strained is measured one time per channel list If the channel list includes more than one multiplexer Vs is measured one time on each multiplexer Downloaded Unstrained References The strain gage multiplexers have the capability of measuring the unstrained reference voltages storing the references in a computer ...

Page 53: ...ding Full Bridge Bending Poisson Full Bridge Poisson Full Bridge ε 4Vr GF 1 2Vr ε 2Vr GF ε 4Vr GF 1 ν 2Vr ν 1 ε Vr GF ε 2Vr GF ν 1 ε 2Vr GF ν 1 Vr ν 1 QUARter HBENding HPOisson FBENding FBPoisson FPOisson ε strain For results in microstrain multiply the calculated measured strain by 1E 6 NOTE tensile strain is compressive strain is Vr Vout VS strained Vout VS unstrained Vout bridge output voltage ...

Page 54: ...m the strain gage to the multimeter via the analog bus The E E1 and E2 signals are wired directly to the strain gage measurement circuitry on the terminal module The measurement circuitry is covered in the following sections Understanding the Strain Gage Measurement Circuits This section describes the strain gage measurement circuits used by each strain gage multiplexer These circuits include Whea...

Page 55: ...an active element strain gage The other arms are fixed value resistors as shown or they may represent unstrained gages In a 1 2 bridge arrangement the 120Ω or 350Ω bridge completion resistor is replaced by a strain gage when the gages are connected to the terminals as indicated in Figure 4 4 Figure 4 2 The Wheatstone Bridge Figure 4 3 Bridge Completion Circuitry 1 4 Bridge 54 Understanding the Str...

Page 56: ...ridge arrangement a 120Ω strain gage multiplexer is required for 120Ω gages and a 350Ω multiplexer is required for 350Ω gages In the 1 2 and full bridge arrangements the bridge completion resistor is replaced by a strain gage Figures 4 4 4 5 Thus any strain gage multiplexer can be used with any value of gage resistance when measuring strain with a 1 2 or full bridge arrangement Figure 4 5 Bridge C...

Page 57: ...The resistance must remain constant for the unstrained measurement and the strain measurement The only resistance which changes is the resistance of the active gage s The Chevron Bridge ensures that the bridge arm resistance remains constant by switching the outputs of the bridge completion channels HI high LO low G guard to the input of the multimeter By switching the outputs rather than switchin...

Page 58: ... same leakage current is reduced In applications where the specimen is maintained at a specific potential by an external source the Wagner Ground will float set the midpoint of the bridge to the same potential For example if 100V is applied to the specimen and the bridge excitation voltage is 5 0V the E point on the Bridge is floated to 102 5V E2 is floated to 97 5V and the midpoint E1 is maintain...

Page 59: ...y of the bridge arrangements available however accurate measurements can still be made when following the wiring guidelines covered in Chapter 2 Rosette Measurements 1 4 bridge measurements are used when measuring strain with rosettes A three element rosette for example would be connected to three bridge completion channels Each channel would then be programmed for a 1 4 bridge measurement Each me...

Page 60: ...y achieved with a 1 2 bridge arrangement is when the strain gages are mounted to the specimen as indicated in Figure 4 10 When the beam is strained strain gage Rg1 will be strained in tension and strain gage Rg2 will be strained in compression When both gages are strained the same amount simultaneously the output of the bridge sensitivity is doubled Since the gages represent adjacent legs in the W...

Page 61: ...a 1 4 bridge arrangement Again since the gages are adjacent legs of the Wheatstone Bridge circuit complete temperature compensation is achieved Dummy Gage In a dummy gage configuration one of the strain gages in the 1 2 bridge arrangement is mounted to an unstrained portion of the specimen Figure 4 12 This gage arrangement provides complete temperature compensation however measurement sensitivity ...

Page 62: ...full bridge arrangement is when the strain gages are mounted to the specimen as indicated in Figure 4 14 When the beam is strained gages Rg1 and Rg2 are strained in tension and gages Rg3 and Rg4 are strained in compression When all gages are strained the same amount simultaneously the bridge sensitivity is increased by a factor of four Since the gages undergoing tensile and compressive strain are ...

Page 63: ... is known as a Poisson arrangement and is represented in Figure 4 15 With a Poisson arrangement the sensitivity is not as great as with the bending full bridge However since the gages are adjacent legs of the Wheatstone Bridge circuit complete temperature compensation is achieved Figure 4 15 Bending Poisson Arrangement 62 Understanding the Strain Gage Multiplexers Chapter 4 Artisan Technology Grou...

Page 64: ... connected to the multiplexer through the HI LO and G terminals on the multiplexer terminal module Figures 2 7 2 8 Procedure Measuring strain with an external voltmeter involves measuring the Wheatstone bridge output voltage Vout and the bridge excitation voltage Vs under strained and unstrained conditions These measurements allow you to compute the value of Vr which in equation form is defined as...

Page 65: ...s If you are using an HP E1326B E1411B Multimeter the guard lead must be connected Note Two wire resistance measurements with an HP E1357A or E1358A FET Strain Gage Multiplexer will be in error by hundreds of ohms This is due to the on resistance of the FET which is in series with resistance being measured Refer to the HP E1326B E1411B Multimeter User s Manual for information on DC voltage and res...

Page 66: ...ys begin with the asterisk character and may include one or more parameters The command keyword is separated from the first parameter by a space character Some examples of Common commands are shown below RST ESR 32 STB SCPI Command Format The SCPI commands perform functions such as making measurements querying instrument states or retrieving data A command subsystem structure is a hierarchical str...

Page 67: ... are all acceptable Command keywords can be entered in their full form as shown above or can be entered in their short form In this manual the entry required in short form commands is always capitalized The short form is generally used for examples in this manual Implied Commands Implied commands are those which appear in square brackets in the command syntax Note that the brackets are not part of...

Page 68: ...sent to the instrument If you do not specify a value for an optional parameter the instrument chooses a default value For example consider the ARM COUNt MIN MAX command If you send the command without specifying a parameter the present ARM COUNt value is returned If you send the MIN parameter the command returns the minimum count available If you send the MAX parameter the command returns the maxi...

Page 69: ...s enabled from the HP IB interface use an interface CLEAR command or the HP E1301 front panel Reset Instr or Clear Instr key to stop the scan When the scan is enabled from the HP IB interface and the trigger source is TRIGger SOURce BUS or TRIGger SOURce HOLD use ABORt or the HP E1301 front panel Reset Instr or Clear Instr keys to stop the scan Stopping Scans Enabled from Front Panel When a scan i...

Page 70: ...ply to downloaded FET multiplexer scan lists Related Commands ABORt INITiate IMMediate RST Condition ARM COUNt 1 Example Setting Ten Scanning Cycles ARM COUN 10 Set 10 scanning cycles SCAN 100 107 Sets channel list INIT Starts scanning cycle COUNt ARM COUNt MIN MAX returns current number of scanning cycles set by ARM COUNt ARM COUN MIN returns the minimum allowable parameter 1 and ARM COUN MAX ret...

Page 71: ...hat is measured is the bridge output voltage Vout and the bridge excitation voltage Vs under unstrained conditions The reference is then computed as Vout Vs unstrained One unstrained reference is required for each channel on which strain is measured CALibration STRain is equivalent to executing CONFigure STRain UNSTrained followed by INIT Thus it leaves the multimeter configured for unstrained ref...

Page 72: ...on specified resolution Autozero CALibration ZERO AUTO ON autozero is performed after every measurement Offset Compensation RESistance OCOMpensated OFF resistance measurements only Trigger Source TRIGger SOURce IMM trigger signal is always true Measurement is taken when multimeter goes to trigger state Number of Triggers or Number of Scans TRIGger COUNt 1 number of triggers issued or number of sca...

Page 73: ...easurements FPOisson Poisson Full bridge measurements FBPoisson Bending Poisson Full bridge measurements QTENsion Tension shunt diagnostic QCOMpression Compression shunt diagnostic UNSTrained Unstrain reference voltage measurement The default strain_function is QUARter 1 4 bridge measurements QTENsion and QCOMpression are used for relay strain gage multiplexers only Example Making 1 4 Bridge Strai...

Page 74: ... in a switchbox to be monitored Parameters Parameter Name Parameter Type Range of Values number AUTO Numeric 1 99 Comments Selecting a Specific Module to be Monitored Send the card number in a switchbox with the DISPlay MONitor CARD command Selecting the Present Module to be Monitored Use the DISPlay MONitor CARD AUTO command to select the last multiplexer addressed by a switching command for exam...

Page 75: ...tored Use the DISPlay MONitor CARD number AUTO command to select the multiplexer Monitor Mode on an HP 1301 Mainframe Display The following shows the types of displays you will get when monitoring relay and FET multiplexer channels SWITCH_112 Chan 0 1 Relay channels 0 and 1 are closed SWITCH_112 Chan 1 FET channel 1 is closed RST Condition DISPlay MONitor STATe OFF 0 Example Enabling the Monitor M...

Page 76: ...COUNt command Sending the INITiate IMMediate command closes the first channel in the channel list Each trigger from a trigger source selected by the TRIGger SOURce command advances the scan through the channel list A trigger at the end of the channel list opens the last channel in the list and if the number of cycles has not reached the ARM COUNt parameter returns to the beginning of the scan list...

Page 77: ...source specified by the TRIGger SOURce command advance the scan through the channel list Comments Starting the Scanning Cycle The INITiate IMMediate command starts scanning by closing the first channel in the channel list A trigger advances the scan through the channel list An invalid channel list generates an error see the ROUTe SCAN command Stopping Scanning Cycles See the ABORt command Example ...

Page 78: ...rformed after every measurement Offset Compensation RESistance OCOMpensated OFF resistance measurements only Trigger Source TRIGger SOURce IMM trigger signal is always true Measurement is taken when multimeter goes to trigger state Number of Triggers or Number of Scans TRIGger COUNt 1 number of triggers issued or number of scans through channel list before multimeter returns to idle state Trigger ...

Page 79: ...surements FPOisson Poisson Full Bridge measurements FBPoisson Bending Poisson Full Bridge measurements QTENsion Tension shunt diagnostic QCOMpression Compression shunt diagnostic UNSTrained Unstrain reference voltage measurement The default strain_function is QUARter 1 4 bridge measurements QTENsion and QCOMpression are used for relay strain gage multiplexers only Example Making 1 4 Bridge Strain ...

Page 80: ... Port When enabled the Trig Out BNC is pulsed each time a channel is closed during scanning Output Pulse The pulse is a 5 V negative going pulse Trig Out Port Reserved by Switchboxes The Trig Out resource is a system resource and can only be reserved by one switchbox instrument at a time Related Commands ROUTe SCAN TRIGger SOURce RST Condition OUTPut STATe OFF port disabled Example Enabling Trig O...

Page 81: ...n ccnn where cc card number 00 99 and nn channel number 00 15 includes internal channels Before using the CLOSe command with the FET multiplexers you must specify the SCAN MODE and SCAN PORT as these commands determine what tree switches will be closed on a given channel You can only have one channel closed on a FET multiplexer at a time If you want to close a channel on two different multiplexers...

Page 82: ...Selects the voltage scanning mode SCAN PORT ABUS Selects the analog bus port CLOS 100 Closes channel 0 of multiplexer 1 CLOSe ROUTe CLOSe channel_list returns the current state of the channel queried The channel_list is in the form ccnn The command returns 1 if the channel is closed or returns 0 if the channel is open Comments Query is Software Readback The ROUTe CLOSe command returns the current ...

Page 83: ...o open the AT BT AT2 and RT tree switches respectively Related Commands ROUTe CLOSe ROUTe OPEN RST Condition All multiplexer channels are open Example Opening Multiplexer Channels This example opens channel 0 of switchbox multiplexer card number 1 OPEN 100 100 opens channel 0 of multiplexer 1 OPEN ROUTe OPEN channel_list returns the current state of the channel s queried The channel_list is in the...

Page 84: ...Scanning List When TRIG SOUR DBUS or TRIG SOUR IMM is set the channel_list for the SCAN command is automatically downloaded into RAM on the FET multiplexer The channels are advanced via the digital bus and no direct intervention by the mainframe CPU is required If the switchbox instrument contains FET and relay multiplexers the scan list is not downloaded but is still scanned Scanning Operation Wi...

Page 85: ...inal module SCAN 100 102 115 Specify the multiplexer channel list to scan and measure INIT Close the first channel in the scan list and start the scan FET Multiplexer Switchbox see Figure 2 8 on page 32 for external connections TRIG SOUR DBUS Switchbox is triggered over the digital bus SCAN MODE VOLT Closes the tree switches required to make a voltage bridge output measurement SCAN PORT ABUS Conne...

Page 86: ... 2 wire measurements using the relay strain gage multiplexer the bridge selection jumper must be set to the FULL bridge position RST Condition ROUT SCAN MODE NONE Example Selecting the Voltage Mode This example scans four channels for DC voltage measurements TRIG SOUR EXT Selects external trigger source SCAN MODE VOLT Selects the voltage scanning mode SCAN 100 102 115 Sets channel list INIT Starts...

Page 87: ...e Selecting the ABUS Port TRIG SOUR EXT Selects external trigger source SCAN MODE VOLT Selects the voltage scanning mode SCAN PORT ABUS Selects the ABUS port SCAN 100 107 Sets channel list INIT Starts scanning cycle SCAN PORT ROUTe SCAN PORT returns the current state of the analog bus port The command returns NONE if the analog bus connection control relays are disabled or ABUS if the control rela...

Page 88: ...g TIME command delays the channel closed pulse until the voltmeter is ready Digital Bus Handshaking Operation of the digital bus is described in the HP E1326B E1411B Multimeter User s Manual Related Commands TRIGger SOUR DBUS TRIGger SOURce IMM Example Setting the Maximum Settling Time TRIG SOUR DBUS Selects external trigger source SCAN MODE VOLT Selects the voltage scanning mode SCAN PORT ABUS Se...

Page 89: ...TRain GFACtor gage_factor channel_list specifies the gage factor for the strain gage on the channel specified A gage factor must be specified for each channel Parameters Parameter Name Parameter Type Range of Values gage_factor Numeric as specified channel_list Numeric 00 07 Comments One gage factor must be specified for each channel measured The gage factor must be specified before the strain is ...

Page 90: ...ge of Values poisson_ratio Numeric as specified channel_list Numeric 00 07 Comments One poisson ratio must be specified for each channel measuring a poisson configuration The poisson ratio must be specified before the strain is measured Example Specifying the Poisson Ratio STR POIS 32 100 Specifies the Poisson Ratio STRain POISson SENSe STRain POISson channel_list returns the poisson ratio set for...

Page 91: ...g the Unstrained Reference OUTPUT 70903 STR UNST Unstr 100 Downloads the reference from computer variable Unstr to channel 100 STRain UNSTrained SENSe STRain UNSTrained channel_list returns the unstrained references for the channels specified Parameters Parameter Name Parameter Type Range of Values channel_list Numeric 00 07 Comments The unstrained references are measured using CALibration STRain ...

Page 92: ...ister Bit 7 STAT OPER ENAB 256 Enables bit 7 of the Status Register to be set OPERation EVENt STATus OPERation EVENt returns the bit value of the Operation Status Register only bit 8 is used by the multiplexer modules Comments Setting Bit 8 of the Operation Status Register Bit 8 Scan Complete is set to 1 after a scanning cycle completes Bit 8 returns to 0 after sending the STATus OPERation EVENt c...

Page 93: ...ription number command returns 8 Channel Relay Strain Gage 120 Ohms 8 Channel 350Ω Ω Relay Strain Gage Multiplexer Description The SYSTem CDEScription number command returns 8 Channel Relay Strain Gage 350 Ohms 8 Channel 120Ω Ω FET Strain Gage Multiplexer Description The SYSTem CDEScription number command returns 8 Channel FET Strain Gage 120 Ohms 8 Channel 350Ω Ω FET Strain Gage Multiplexer Descr...

Page 94: ...annel 120Ω Ω Relay Strain Gage Multiplexer Module Model Number The SYSTem CTYPe number command returns HEWLETT PACKARD E1355A 0 A 03 00 8 Channel 350Ω Ω Relay Strain Gage Multiplexer Module Model Number The SYSTem CTYPe number command returns HEWLETT PACKARD E1356A 0 A 03 00 8 Channel 120Ω Ω FET Strain Gage Multiplexer Module Model Number The SYSTem CTYPe number command returns HEWLETT PACKARD E13...

Page 95: ... errors are cleared first in first out When the queue is empty each following SYSTem ERRor command returns 0 No error To clear all error numbers messages in the queue execute the CLS command Maximum Error Numbers Messages in the Error Queue The queue holds a maximum of 30 error numbers messages for each switchbox If the queue overflows the last error number message in the queue is replaced by 350 ...

Page 96: ...US commands remain in effect after triggering the switchbox with the TRIGger IMMediate command Related Commands INITiate ROUTe SCAN Example Advancing Scan using the TRIGger Command TRIG SOUR HOLD Sets trigger source to hold SCAN 100 107 Sets channel list INIT Starts scanning cycle loop statement Start count loop TRIG Advances scan to next channel increment loop Increment count loop SOURce TRIGger ...

Page 97: ... is assigned to the first switchbox requesting the external trigger source Assigning External Trigger A switchbox assigned with TRIGger SOURce EXTernal remains assigned to that source until it receives a command to change the source When the source is changed the external trigger source is available to another switchbox with a TRIGger SOURce EXTernal command Using Bus Triggers To trigger the switc...

Page 98: ...ource for the switchbox Command returns either BUS DBUS EXT HOLD or IMM for trigger sources BUS DBUS EXTernal HOLD or IMMediate respectively Example Query Trigger Source TRIG SOUR EXT Sets trigger source to external TRIG SOUR Query trigger source returns EXT Chapter 5 Strain Gage Multiplexer Command Reference 97 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisant...

Page 99: ...ee note below CLS Clear status Clears all status registers see STATus OPERation EVENt ESE ESE Event status enable Event status enable query See note below See note below ESR Event status register query See note below SRE SRE Service request enable Service request enable query Enables status register bits see Chapter 4 for operation See note below STB Read status byte query See note below TRG Trigg...

Page 100: ...ling TIME MIN MAX channel_list Close channel s Query channel s closed Open channel s Query channel s opened Define channels for scanning Selects appropriate tree isolation switches for measurements Returns present state of scan mode Enables tree isolation switches closure as part of a measurement Query analog bus state Sets delay between trigger pulse and channel closed pulse Returns current param...

Page 101: ...le Description RST Reset Opens all channels and invalidates current channel list for scanning Sets ARM COUN 1 TRIG SOUR IMM and INIT CONT OFF TRG Bus Trigger When scan is enabled and trigger source is TRIG SOUR BUS use the TRG command to trigger the switchbox to advance the scan TST Self Test Power on interrupt returns 110 Incorrect MFR ID or model code returns 103 Test pass returns 0 100 Strain G...

Page 102: ...sistors shorted 10 MHz Channel Channel Crosstalk Typical 50Ω Source Load 1 kHz 80dB 10 kHz 80 dB 100 kHz 80 dB 1 MHz 60 dB 10 MHz 40 dB Protection resistors shorted and Low and Guard tied to chassis Screw Terminal Wire Size 16 AWG Max 26 AWG Min Module Size Device Type B register based Connectors Used P1 Number of Slots 1 VXIbus Interface Capability Interrupter D16 Interrupt Level 1 7 selectable P...

Page 103: ...n 500 kHz Low tied to chassis Screw Terminal Wire Size 16 AWG Max 26 AWG Min Module Size Device Type B register based Connectors Used P1 Number of Slots 1 Interrupt Level selectable Power Requirements Voltage 5V 12V Peak module current IPM A 0 53 0 13 Dynamic module current IDM A 0 01 0 01 Strain Gage Excitation chassis referenced 4 63V 10 Max Current 400mA short circuit protected Watts Slot 2 8 C...

Page 104: ...sistance exceeds a predetermined value the relay should be replaced Stability of Contact Resistance The stability of the contact resistance decreases with age Using this method the contact resistance is measured several 5 10 times and the variance of the measurements is determined An increase in the variance indicates deteriorating performance Number of Operations Relays can be replaced after a pr...

Page 105: ...Notes 104 HP E1355A E1356A E1357A E1358A Specifications Appendix A Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 106: ...re εp q Principal strains σp q Principal stresses and θp q the acute angle from the axis of gage 1 to the nearest principal axis When positive the direction is the same as that of the gage numbering and when negative opposite NOTE Corrections may be necessary for transverse sensitivity refer to gage manufacturers literature Biaxial Stress State Equations The following equations relate stress to st...

Page 107: ... psi ABS unfilled 0 2 0 4 4500 7500 Aluminum 2024 T4 0 32 10 6 48000 Aluminum 7075 T6 0 32 10 4 72000 Red Brass soft 0 33 15 15000 Iron Gray Cast 13 14 Polycarbonate 0 285 0 3 0 38 8000 9500 Steel 1018 0 285 30 32000 Steel 4130 4340 0 28 0 29 30 45000 Steel 304 SS 0 25 28 35000 Steel 410 SS 0 27 0 29 29 40000 Titanium alloy 0 34 14 135000 a Elastic strength may be represented by proportional limit...

Page 108: ...rcuit for bridge completion channels 0 and 1 From this voltage and the value of the bridge completion resistor the leadwire resistance can be determined so that leadwire desensitization corrections can be made 10 11 Internal Half Bridge Voltage Channels 10 and 11 measure the lower and upper legs of the internal half bridge voltage This checks the stability of the 1 000Ω bridge completion resistors...

Page 109: ...1 4 bridge strain Rl is the leadwire resistance and Rg is the resistance of the strain gage 120Ω or 350Ω Specification There is no specification for leadwire resistance however typical values can range from a few tenths of an ohm to several ohms Among the factors that will affect leadwire resistance are wire gage wire length and temperature Set Up To perform the leadwire resistance diagnostic your...

Page 110: ...Ω bridge completion resistor Rcomp These parameters are represented with the circuit of Figure C 2 and the leadwire resistance is calculated using the equation R_leadwire V_leadwire x Rcomp V_lower Vout V_leadwire Figure C 1 Externally Supplied Bridge Excitation Voltage Figure C 2 Determining Leadwire Resistance Appendix C Strain Gage Diagnostics 109 Artisan Technology Group Quality Instrumentatio...

Page 111: ...nning multimeter instrument The computer syntax used is HP BASIC running on a Hewlett Packard Series 300 computer Clear and reset the multimeter CLEAR 70903 OUTPUT 70903 RST Measure the voltage across the lower leg of the internal 1 2 bridge resistor V_lower OUTPUT 70903 MEAS VOLT DC 110 ENTER 70903 V_lower Measure the bridge output voltage Vout on channel 0 OUTPUT 70903 MEAS VOLT DC 100 ENTER 709...

Page 112: ...resistors and where the measurements occur Specification The ratio of voltages on the upper and lower bridge legs should be 1 0 1 Set Up To perform the internal half bridge voltage diagnostic your system should be configured as follows 1 If the bridge excitation voltage is externally supplied connect the supply to the terminal module as shown in Figure C 1 Set the voltage to 5 0V 2 If desired conn...

Page 113: ...rd Series 300 computer Clear and reset the multimeter CLEAR 70903 OUTPUT 70903 RST Measure the voltage across the upper leg of the internal 1 2 bridge resistor OUTPUT 70903 MEAS VOLT DC 111 ENTER 70903 V_upper Measure the voltage across the lower leg of the internal 1 2 bridge resistor OUTPUT 70903 MEAS VOLT DC 110 ENTER 70903 V_lower Compute the ratio of the upper bridge leg voltage to the lower ...

Page 114: ...n is simulated by placing a 158kΩ resistor in parallel with the upper leg 1kΩ internal half bridge resistor A known compressive strain is simulated by placing a 59kΩ resistor in parallel with the strain gage on the bridge completion channel specified Figure C 4 If the tensile or compressive strain measured is equivalent to the simulated value the bridge completion circuitry is functioning properly...

Page 115: ...rection 3 All values are in µε To increase measurement accuracy leadwire corrections are included in the table under Notes to compensate for leadwire resistances Refer to the Leadwire Resistance diagnostic to determine the leadwire resistance of your bridge arrangement Determining the leadwire resistance is not a prerequisite for this diagnostic Set Up To perform the shunt verification diagnostic ...

Page 116: ...e simulated tension and compression strain The program assumes the relay strain gage multiplexer is used with the HP E1326B E1411B multimeter as part of a scanning multimeter instrument The computer syntax used is HP BASIC running on a Hewlett Packard Series 300 computer Clear and reset the multimeter CLEAR 70903 OUTPUT 70903 RST Measure the unstrained reference voltage on the bridge output channe...

Page 117: ...ion voltage 2 Set Up To perform the guard voltage diagnostic your system should be configured as follows 1 If the bridge excitation voltage is externally supplied connect the supply to the terminal module as shown in Figure C 1 Set the voltage to 5 0V 2 If desired connect the bridge arrangement to the bridge completion channels Strain gages do not have to be connected for this diagnostic CAUTION U...

Page 118: ...r syntax used is HP BASIC running on a Hewlett Packard Series 300 computer Clear and reset the multimeter CLEAR 70903 OUTPUT 70903 RST Measure the guard voltage on internal channel 14 OUTPUT 70903 MEAS VOLT DC 114 ENTER 70903 G_volt Print the guard voltage PRINT Guard voltage G_volt END A typical output from this program is Guard voltage 2 5233 Appendix C Strain Gage Diagnostics 117 Artisan Techno...

Page 119: ...he excitation voltage is externally supplied and that the strain gage multiplexer is used with the HP E1326B E1411B Multimeter as part of a scanning multimeter instrument The computer syntax used is HP BASIC running on a Hewlett Packard Series 300 computer Clear and reset the multimeter CLEAR 70903 OUTPUT 70903 RST Measure the bridge excitation voltage on internal channel 15 OUTPUT 70903 MEAS VOLT...

Page 120: ...throughput speed since it eliminates command parsing and allows the use of an embedded controller Also if slot 0 the resource manager and the computer interface HP IB are provided by other devices a C size system can be downsized by removing the command module This appendix contains the information you need for register based programming The contents include Register Addressing Page 120 Register D...

Page 121: ... use eight of the 64 addresses allocated Figure D 1 shows the register address location within A16 Figure D 2 shows the location of A16 address space in the HP E1405 E1406 Command Module and HP E1300 E1301 Mainframe As an example both figures show the register map for the HP E1351A E1353A FET Multiplexers This map is also the same for the HP E1357A E1358A FET Strain Gage Multiplexers Figure D 1 Mu...

Page 122: ...ltiplexer s base address is computed as 1 C00016 LADDR 64 16 or 49 152 LADDR 64 where C00016 49 152 is the starting location of the register addresses LADDR is the multiplexer s logical address and 64 is the number of address bytes per VXIbus device For example the multiplexer s factory set logical address is 112 With this address the multiplexer has a base address C00016 112 64 16 C00016 1C0016 D...

Page 123: ...C00016 112 64 16 1FC00016 1C0016 1FDC0016 or 2 080 768 112 64 2 080 768 7 168 2 087 936 Register Offset The register offset is the register s location in the block of 64 address bytes For example with a LADDR of 112 the multiplexer s Scan Channel Delay Register has an offset of 0816 When you write a command to this register the offset is added to the base address to form the register address DC001...

Page 124: ...e base 0016 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Read Device Class Address Mode Manufacturer ID Device Class Device Classification Bits 15 and 14 classify a device as one of the following 0 0 memory device 0 1 extended device 1 0 message based device 1 1 register based device The HP E1355A E1356A multiplexers are register based devices Address Space Addressing Mode Bits 13 and 12 indicate the add...

Page 125: ...del codes identify the HP E1355A and E1356A Relay Strain Gage Multiplexers The model codes are set by the card ID jumpers located on the E1345 66201 component assembly FF0416 HP E1355A 8 Channel 120Ω Relay Strain Gage Multiplexer FF0616 HP E1356A 8 Channel 350Ω Relay Strain Gage Multiplexer Status Register The relay strain gage multiplexer Status Register is monitored to determine when the multipl...

Page 126: ...elay 93 92 91 or 90 respectively When making strain measurements using a switchbox tree relay 90 must be closed DC voltage measurement Channel Register The Channel Register is used to close the relay strain gage multiplexer internal channels and bridge completion channels base 0816 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Write Ch15 Int Ch14 Int Ch13 Int Ch12 Int Ch7 B_c Ch6 B_c Ch5 B_c Ch4 B_c Ch11 ...

Page 127: ... 3 2 1 0 Read Device Class Address Mode Manufacturer ID Device Class Device Classification Bits 15 and 14 classify a device as one of the following 0 0 memory device 0 1 extended device 1 0 message based device 1 1 register based device The HP E1357A E1358A FET Strain Gage Multiplexers are register based devices Address Space Addressing Mode Bits 13 and 12 indicate the addressing mode used by the ...

Page 128: ...Gage Multiplexer FF1616 HP E1358A 8 Channel 350Ω FET Strain Gage Multiplexer Status Register The FET multiplexer Status Register indicates if interrupts are enabled if an interrupt has occurred and if the multiplexer is busy closing or opening a channel base 0416 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Read F F 1 1 1 BSY 1 1 IRQ IRQ EN IRQ EN Interrupt Request Enabled A zero 0 indicates enabled a on...

Page 129: ...A zero 0 indicates it is disabled IMM EN Immediate Enable A one 1 in this bit indicates the immediate trigger mode is set CNT EN Continuous Enable A one 1 in this bit indicates the continuous scanning mode is set Scan Channel Delay Register Reading the Scan Channel Delay Register returns the SETTling TIME delay base 0816 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Read F F 1 1 1 1 D3 D2 D1 D0 D3 D0 Data...

Page 130: ...fter a reset or the multiplexer will not operate The Reset conditions are all enables are set false 0 clear scan list scan mode enabled direct bit set 0 delay is 1 µsec and all channels opened IRQ EN Interrupt Request Enable Write A one 1 enables the card to generate interrupts a zero 0 disables it DIR Direct Selects between direct control and scan list control A zero 0 indicates scan list control...

Page 131: ...s bit enables the card to continually cycle through the scan list When this bit is enabled the last channel in a scan list resets the pointer back to the beginning of the scan list When this bit is set to zero 0 the last channel in the scan list generates an interrupt if the channel is valid VLD set true 0 Scan Channel Configuration Register RST PTR Reset Pointer Resets the pointer back to the beg...

Page 132: ...ge 0 1 1 1 measures the upper leg of the internal half bridge voltage 1 0 0 0 closes bridge completion channel 4 1 0 0 1 closes bridge completion channel 5 1 0 1 0 closes bridge completion channel 6 1 0 1 1 closes bridge completion channel 7 1 1 0 0 not used 1 1 0 1 not used 1 1 1 0 measures the guard voltage 1 1 1 1 measures the bridge excitation voltage C1 C0 Configuration bits These bits determ...

Page 133: ... 1 0 closes bridge completion channel 6 1 0 1 1 closes bridge completion channel 7 1 1 0 0 not used 1 1 0 1 not used 1 1 1 0 measures the guard voltage 1 1 1 1 measures the bridge excitation voltage Direct Control Register The Direct Control Register allows you to set the controls for individual channels Note that the DIR bit in the Control Register must be set true for this register to be enabled...

Page 134: ... and DIAGnostic POKE to read and write to the registers Reading the ID Register As previously mentioned the ID Register indicates the classification addressing mode and manufacturer of the device This program reads the ID Register and returns FFFF16 Convert the switchbox base address to decimal and store the value in a variable COM Base_addr Base_addr DVAL 1FDC00 16 Call the subroutine which reads...

Page 135: ... in a variable COM Base_addr Base_addr DVAL 1FDC00 16 Call the subroutine which reads the Device Type Register CALL Peek_dt END Subroutine to read the Device Type Register SUB Peek_dt COM Base_addr OUTPUT 70900 DIAG PEEK Base_addr 2 16 ENTER 70900 Register Hex IVAL Register 16 PRINT Hex SUBEND A typical return is FF06 HP E1356A 134 Strain Gage Register Based Programming Appendix D Artisan Technolo...

Page 136: ...the subroutine which measures the bridge excitation voltage CALL Ex_volt END Subroutine which closes internal channel 15 in the Channel Register and tree relay 90 in the Tree Switch Register in order to access and measure the bridge excitation voltage SUB Ex_volt COM Base_addr OUTPUT 70900 DIAG POKE Base_addr 8 16 H8000 OUTPUT 70900 DIAG POKE Base_addr 6 16 H1 SUBEND FET Multiplexer Scanning This ...

Page 137: ...SUB Fet_scan COM Base_addr Clear old the scan list and set up the Scan Control Register for the next scan OUTPUT 70900 DIAG POKE Base_addr 6 16 H1 OUTPUT 70900 DIAG POKE Base_addr 6 16 H0 Download the scan list Scan bridge output channels 0 1 2 and bridge excitation channel 15 OUTPUT 70900 DIAG POKE Base_addr 10 16 H6000 OUTPUT 70900 DIAG POKE Base_addr 10 16 H6001 OUTPUT 70900 DIAG POKE Base_addr...

Page 138: ...upported by the module e g channel 99 of a multiplexer module 2006 Command not supported Sending a command to a module card in a switchbox that is unsupported by the module 2008 Scan list not initialized Executing INIT command with no scan channel_list 2009 Too many channels in channel list Attempting to address more channels than available in the switchbox 2010 Scan mode not allowed on this card ...

Page 139: ...Notes 138 Strain Gage Multiplexer Error Messages Appendix E Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com ...

Page 140: ...nnel register 125 control register 125 129 device type register 124 127 direct channel configuration register 132 direct control register 132 manufacturer ID register 123 126 scan channel configuration register 131 scan channel delay register 128 130 scan control register 128 130 status register 124 127 tree switch register 125 Block Diagrams 52 Boolean Command Parameters 67 Bridge configurations ...

Page 141: ...der 11 Common Commands 65 CLS 98 ESE 98 ESR 98 format 65 IDN 98 list of 98 OPC 98 OPC 98 quick reference 100 RCL 98 RST 98 100 SAV 98 SRE 98 SRE 98 STB 98 TRG 96 98 100 TST 98 100 WAI 98 Configuration bridge 58 strain gage multiplexer 19 terminal module 23 CONFigure Subsystem 71 72 99 CONFigure STRain 72 FBENding 72 FBPoisson 72 FPOisson 72 HBENding 72 HPOisson 72 QCOMpression 72 QTENsion 72 QUARt...

Page 142: ...e measurements 36 See also Program Examples relay strain gage measurements 41 rosette measurements 39 single channel 1 4 bridge measurements 35 single channel bending full bridge measurements 40 Excitation Voltage externally supplied 24 FET multiplexer 19 internally supplied 18 relay multiplexer 18 required for bridge 24 External Voltmeter connecting FET multiplexers to 32 connecting relay multipl...

Page 143: ... 98 Implied Commands 66 INITiate Subsystem 75 76 99 INITiate CONTinuous 75 INITiate CONTinuous 76 INITiate IMMediate 76 Instrument Addressing 21 Interface Select Code 21 Internal half bridge voltage diagnostics 111 supplied bridge excitation voltage 18 Interrupt Line 17 IRQ 17 J Jumpers bridge selection 24 55 card ID 14 excitation voltage 19 interrupt line IRQ 17 strain excitation 19 K Keywords ru...

Page 144: ...ters 67 O OPC 98 OPC 98 Opening channels 82 93 tree switches 82 Operation Status Register 91 bit value 91 Optional command parameters 67 commands 66 OUTPut Subsystem 79 99 OUTPut STATe 79 OUTPut STATe 79 Overview 13 P Parameters 67 Physical Description 13 Poisson bending full bridge FBPoisson 62 full bridge measurements FPOisson 63 half bridge measurements HPOisson 60 ratio 89 Power Requirements 2...

Page 145: ...ns 123 relay multiplexer registers 123 125 resetting the switchbox 135 Registers addressing 120 channel 125 control 125 129 135 descriptions 123 device type 124 127 134 direct channel configuration 132 direct control 132 FET multiplexer 126 130 FET multiplexers READ 126 128 FET multiplexers WRITE 129 132 ID 123 126 133 offset 122 operation status 91 relay multiplexer 123 125 relay multiplexers REA...

Page 146: ...6 optional parameters 67 OUTPut subsystem 79 99 parameters 67 quick reference 99 reference 67 99 ROUTe subsystem 80 87 99 SENSe subsystem 88 90 99 short form 66 STATus subsystem 91 99 SYSTem subsystem 92 94 99 TRIGger subsystem 95 97 100 Secondary HP IB Address 21 SENSe Subsystem 88 90 99 SENSe STRain GFACtor 88 SENSe STRain GFACtor 89 SENSe STRain POISson 89 SENSe STRain POISson 89 SENSe STRain U...

Page 147: ...Tem ERRor 94 T Terminal Module bridge completion channels 25 27 bridge excitation voltage terminals 24 bridge selection jumpers 24 bridge wiring diagrams 25 configuration 23 H L G voltmeter terminals 25 identifying 14 wiring 26 Tree Switches closing 86 opening 82 register relay multiplexer 125 TRG 96 98 100 Trig Out Port 79 TRIGger Subsystem 95 97 100 TRIGger SOURce 95 96 BUS 95 96 DBUS 95 96 EXTe...

Page 148: ... considerations 27 full bridge arrangement 30 half bridge arrangement 29 quarter bridge arrangement 25 28 strain gage multiplexers 27 32 terminal module 26 to bridge completion channels 54 using twisted shielded cable 27 wire gage 27 WRITE registers channel register 125 control register 125 129 direct channel configuration register 132 direct control register 132 FET multiplexers 129 132 relay mul...

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