Four-Channel Transient Strain Signal Conditioning
Contents
1. O O O 7 TT BRIDGE SENSE EXCITATION SENSE L gt EXCITAT EN poe COMPLET 283 33 c 354 21337 341 r 3 E E484 rE494 rE504 r E51 48 494 r50 51 Ea K cae B G 46 16 16 ORAOARGARORA rz HT HTS m n 1 CND ICAL HAL D ITE SE OHMS SCP 4 5 HHBH O O SCP 6 7 BEBJJERE DO NOT USE CENTER BLOCK FOR CH 32 63 EXCITATION BRIDGE COMPLETIONS O r BRIDGE SENSE EXCITATION SENSE E32 334 E344 E35 327 33 34 35 48 49 50 51 482 49 50 51 Laa ORO Ra RR E J GLHGLHOGLHGLHOGLHGLHGLHGLH C C Figure 7 VT1511A B size Terminal Module Connections Ch 32 63 I HL HL EL G GAL HL HL H LGE GG G G Ll 4 Jt M S N a 16 17 2 182 19 ALGAJ Las Esla 135 LS PPS EXCITATION SENSE 5 EXCITATION SENSE EXCITATION EST EXCITATION HL HL HL HINHL HL HL HL HL a RAR RA RA LL9 42 2 25 2 U16 147 JU 18 2 C49 J a ay DEO idet L 48 jc 49 LE guts J BRIDGE SENSE BRIDGE SENSE Oo BRIDGE COMPLETION BRIDGE COMPLETIO SCP 0 1 SCP 2 3 O SCP 4 5 SCP 6 7 RHRRRGGIRRRRGG GGLHLHIGELH LH o UL 3 I0 6118 49 063 640 322 33 Gb 1 dB ag BRIDGE COMPLETION BRIDGE COMPLETION BRIDGE SENSE BRIDGE SENSE ISIS C1637217 S 34355 r504r514 d RRR mom Rom LH LH L WL N LH L H ES E197 N 327 48 7 EXCITATION EXCITATION EXCITATION SENSE EXCITATION SENSE rEOA El Arc E24 E164 ENA E184 335 344 355 495 504 515 ho xo A2. Shielded Cable Figure 9 Typical 1 4 Bridge Connections Note The optional Shunt Resistor connection is shown by the dashed lines Sample IE 10 VTI511A Transient Strain SCP Connecting To The Terminal Module 1 2 Bridge Use Figure 10 for 1 2 Bridge connections to the Terminal Module Remove or be Connections sure the 1 4 Bridge Jumper s is not installed in the 1 4 Bridge configuration for all channels that are to make 1 2 Bridge measurements see Figure 4 Transient Strain SCP 0 1 J Top Sample BRIDGE SENSE EXCITATION SENSE 007 rOi14r024r034pr004r014r024r034 pi GHLGHLGH GOOCH GHLGHLG SCP 0 poc c c cRABRAGARCARO Ep L E1 J LE2 J L E3 3 q og C04 02 Lo3W L EXCITATION BRIDGE COMPLETION gt T A Bending 1 2Bridge Note The optional Shunt Resistor connection is shown by the dashed lines Transient Strain SCP 0 1 i i 0 1 lt ARA SENSE EXCITATION MENOR r004r014r024rpr034 r004r014r024r 034 7 u P GHLGHLGHI POSER GHLGHLG OC 4 L TRD T H HBHH H DOS 4 64 ayas PRG RACAR TIITIIITTIIIIITITT EQ J L E17 C po 2 L ES Oh 501 4 L 92J Loz A _ n Shield EXCITATION BRIDGE
3. I For 1200 gages i lI e EZ move jumper I i It MNS f from X01 to X02 i Rs 1200 X02 2 AAA I bog X03 1 4 Bridge 1 completion o o 4x04 Jumper in R 1 X04 position I Bridge Measurement Command s 1 1 29 402 L p SENSe FUNCtion STRain QUARter K PQ V VN V Shunt I I 5 La OUTPut SHUNt 10KQ 1 TY VN l Bridge Completion Excitation__ 11 ai Figure 1 Typical 1 4 Bridge Measurement Terminal Module Transient Strain SCP To ie ee ee ee ne coa ss I Bridge amp Excitation Sense INPuEGAIN INPutFILTer LPASs FREQuency dva H i l ai 2 P r Sample Hold Circuit Ki ote I E LUIS N i The optional Shunt bia vakaa X gt gt Ss Resistor connections Lo d Li E L i are shown by the 2711 Y EUN i dotted lines 11 L AGND G 10K 7 4 I Q4 NAN gt _ Strain Gages H 1 1 H gt l 1 H i N 14 Excitation Sense L H M ot 1 aa tan Es sl 177 I l I 1a Switch closed INPutLOW WVOLtage i for 1 2 Bridge I l I 11 I E P D rl N Exci ation OUTPut VOLTage AMPLitude r Excitation m aes I S l E DZ l I Var T 3500 X01 E NAN o l Ra 1200 X02 SSS SENSE A T Se N E a pv 2 NINN e I Bridge X03 xo 1 4 Bridge Bridge Measurement Commands Completion Ne Jumper in i SENSe
4. 100 103 selects the sample and hold lowpass filter frequency default is 15 Hz INP GAIN 8 100 103 selects the gain of the sample and hold circuitry default is 0 5 CAL TARE 100 103 measure the unstrained voltage on channels 0 3 CAL TARE to return the success flag from the CAL TARE operation enter CAL TARE query wait until success flag from CAL TARE operation is returned Configure the Measurement STR GFAC 2 100 103 specifies the gage factor on channels 0 3 selected factor 2 is the default value FUNC STR QUAR 1 100 103 link channels 0 3 to EU conversion for strain measurement selected 1V range value is the default value Bridge is Strained When the bridge is in the Strained configuration and the measurements are to be made scan the selected channels and make the measurements Use the VT1413C s INITiate and TRIGger commands to make the strain measurement You must define what triggers etc to use to make the measurements see the VT1413C User s Manual for information Programming With SCPI Commands VT1511A Transient Strain SCP 15 Making Full Bending The following example shows how to make Full Bridge Bending Poisson Bridge Poisson Bridge measurements using channels 0 through 3 Be sure to set the jumper for the 1 2 or Full Bridge configuration see Figure 4 Measurements Bridge is Unstrained The following commands select the excitation voltage and specifies the parameters to convert strain gag
5. FUNCtion STRain HBENding Rs 29 4KQ X03 position I I SENSe FUNCtion S TRain HPOisson MINER ua A zi H lA V V WV V l i Shunt G 11 OUTPut SHUNt 10KQ i I F1 NAM Bridge Completion Excitation 11 f Figure 2 Typical 1 2 Bridge Measurement VTISTIA Operation VT1511A Transient Strain SCP 5 Note The optional Shunt Resistor connections are shown by the dotted lines Transien t Strain SCP I Bridge Measurement Commands SENSe FUNCtion STRain FBENding SENSe FUNCtion STRain FPOisson SENSe FUNCtion STRain FBPoisson Figure 3 Typical Full Bridge Measurement Terminal Module To Else li nae iara E c RES Bridge amp Excitation Sense VT1413C I B INPuEGAIN UNPutFILTer LPASs FREQuency Input S ih l Q T oe Sample Hold Circuit ioc Sense Amplifier gt N L gt Avg N A 7 e U e A Y L N gt I li 7 G 10KQ Y AGND A 7 i 11 H i oH i Excitation Sense C l lt ESTA RT e NE 2 Switch open 7 11 for Full Bridge INPut LOW FLOat lI Lo i La L lt I Es Saxa l Excitation OUTPut VOLTage AMPLitude Excitation 2 Voltage I E JK s Noe dh not i lt i l 2 MEE et 120 3500 xoi V Om Full
6. 16 32 and 48 if all SCPs are VT1511A SCPs The value returned for the SCP in an Agilent HP E1413B is HEWLETT PACKARD E1413 Opt 21 4 Ch S H Strain Bridge Completion SCP 0 The value returned for the SCP in a VT1413C or Agilent HP E1313A is HEWLETT PACKARD E1511 4 Ch S H Strain Bridge Completion SCP 0 To determine the type of SCP installed on channels 0 through 7 send SYST CTYP 9100 enter statement here query SCP type ch 0 enter response string 14 VTI511A Transient Strain SCP Programming With SCPI Commands Making 1 4 Bridge The following example shows how to make 1 4 Bridge measurements using Measurements channels 0 through 3 Be sure to set the jumper for the 1 4 Bridge configuration see Figure 4 Bridge is Unstrained The following commands select the excitation voltage and specifies the parameters to convert strain gage readings for the specified channels Do this when the bridge isin the Unstrained configuration The commands are separated into two parts The first part configures and calibrates the excitation completion circuitry The second part configures the module for strain measurements Execute these commands when the bridge is in the Unstrained configuration Setup and Calibrate Excitation Completion Circuitry OUTP VOLT AMPL 1 100 103 select the excitation voltage value for channels 0 3 default is 0 V INP LOW WVOL 100 103 selects the Wagner voltage input INP FILT FREO 1000
7. Bridge i AAA v I La VVV Re 1200 X02 led MES uut AAA I 7 Bridge X03 1 4 Bridge i i E Completion A X04 Jumperin I Rs a 294KO X03 position PQ ANN had uu l Shunt I G_ lil OUTPut SHUNt 10KQ I 1 1 VN I i ML 6 VTI5TIA Transient Strain SCP VT1511A Operation Selecting the 1 4 Bridge and 120 350 Ohm Jumpers Figure 4 shows how to select the 1 4 Bridge Jumper and how to select for either 120 Q or 350 O bridges 1 4 Bridge 3500 1200 Rear View e e jo e jo e os ee Connectors on other side nae 4 wee ade 1 2 or Full Bridge 3500 1200 E je e le el ZEE je e e e 4 Channels 0 1 2 3 e e X04 ie e X04 je e X04 je e X04 X03 X03 X03 X03 X02 X02 X02 X02 le e X01 ee X01 e e X01 e e X01 Figure 4 Selecting the 1 4 Bridge and 120 350 Ohm Jumpers Selecting the 1 4 Bridge and 120 350 Ohm Jumpers VTI511A Transient Strain SCP 7 Connecting To The Terminal Module This section shows how to make 1 4 1 2 and Full Bridge strain gage connections to the Terminal Module The SCP connections for the Terminal Modules are shown on the stick on labels that came with the SCP Use the appropriate label for the type of Terminal Module you have The connections and appropriate stickers are as follows e For VT1413C and above Terminal Modules use stickers for VT1510A SCPs The connections are shown in Figure 5 e For Agile
8. C LHLHLHJLHLHL L Figure 8 Agilent HP E1413 Option 21 Terminal Module Connections Connecting To The Terminal Module VT1511A Transient Strain SCP 9 Wiring the Terminal Module Note e See Attaching and Wiring the Terminal Module in the VT1413C User s Manual to wire the strain gages to the Terminal Module For accurate measurements use a twisted shielded cable for the strain gage connections Connect the shield to the specimen and to the guard G terminal on the Terminal Module The following figures in this section show the connections using SCP 0 as the Strain SCP and SCP 1 as the Direct Input SCP Use the same technique using other SCPs and other channel numbers For example for a Channel 00 H and L connection on SCP 0 connect to H and L on Channel 57 for SCP 7 See Opening and Wiring the Terminal Module in the VT1413C User s Manual to wire the strain gages to the Terminal Module 1 4 Bridge Use Figure 9 for 1 4 Bridge connections to the Terminal Module Install or make Connections sure the 1 4 Bridge Jumper s is installed in the 1 4 Bridge configuration for all channels that are to make 1 4 Bridge measurements see Figure 4 Transient Strain SCP 0 1 BRIDGE SENSE 007 rO14 r024r034 r0 EXCITATION SENSE 045 014 7024 035 GH GOOG H GHLGHLG E37 o RR x A S S Loi b027 037 BRIDGE COMPI ETION S
9. J L Ed L E E2 J LE ES Qu S SOR Ag Bs N L gt EXCITATION BRIDGE COMPLETION z 4 L E Top Sample 7 ts a Note The optional Shunt Resistor connection is shown by the dashed lines Bottom Sample KA lt LLLP FLA Figure 11 Typical Full Bridge Connections 5 oe 12 VTI511A Transient Strain SCP Connecting To The Terminal Module Transient Strain SCP 0 1 BRIDGE SENSE EXCITATION SENSE a m mel rc 004 013 0241034 100570147 027 r 037 DOGHLGHLGHLG OGHLGHLGHL Bending Poisson Full Bridge SCP 0 1 Fod C01 025 03 E I zum H L EXCITATION BRIDGE COMPLETION ff OA 6 C dt M Ul E g e Mas Top Sampl p The optional Shunt Pp SAMPE ZZ 2 Resistor connection L is shown by the dashed lines J A 7 Bottom Sample SS SSS SS e ZZ i Z A 1m A 07 sos lt Shield J n UI x Figure 12 Typical Full Bridge Connections Cont Connecting To The Terminal Module VT1511A Transient Strain SCP 13 Programming With SCPI Commands The following SCPI commands verify the SCP types installed in the VT1413C and how to program the VT1413C for strain measurements using VT1511A SCPs The commands listed in this section are below and also in Chapter 5 of the VT1413C User s
10. Manual SCPI Commands The following table lists all commands used in this section of the manual Used Command CALibration TARE lt ch_list gt CALibration TARE INPut FILTer LPASs FREOuency cutoff freq gt ch_list gt INPut GAIN lt chan_gain gt 5 lt ch_list gt INPut LOW FLOat WVOLtage lt ch_list gt OUTPUt VOLTage AMPLitude lt amplitude gt amp ch list SENSe FUNCtion STRain FBPoisson lt range gt 0 lt ch list SENSe FUNCtion STRain QUARter lt range gt lt ch_list gt SENSe STRain GFACtor gage factor gt O lt ch list gt SENSe STRain POlSson lt poisson_ratio gt lt ch_list gt SYSTem CTYPe lt channel gt Description calibrates SCP on specified channels returns calibration value selects the SCP s low pass filter cufoff frequency selects the sample and hold gain selects the sample amp hold amplifier input connection selects the excitation voltage value selects the range for the full bridge bending poisson EU conversion selects the range for quarter bridge EU conversion selects the strain gage factor selects the poisson ratio returns the SCP type Checking the ID of Use the SYSTem CTYPe lt channel gt command to verify the SCP type s the SCP in the VT1413C e The channel parameter specifies a single channel in the channel range covered by the SCP of interest The first channel numbers for each of the SCP positions are 0
11. mA supply limit The measurement circuitry provides the measurement path to the VT1413C for both the excitation voltage and the output voltage of the strain gage bridge The VT1413C measures the excitation voltage during calibration and measures the bridge output voltage during a measurement cycle The measurement circuitry samples all channels simultaneously and thus reduces the skew introduced by scanning The amount of skew removed depends on the cutoff frequency setting of the lowpass Filter see next paragraph When reducing the filter bandwidth the propagation delay increases between the channels which causes a larger delay between channels programmed to the same bandwidth see specifications for delay values The circuitry provides a voltage gain of 0 5 8 64 or 512 for each bridge output measurement channel The SCP also has a lowpass Filter on each bridge output measurement channel The filter is a 6th order Bessel Active RC filter used to provide alias protection and noise reduction The filter cutoff frequencies are 1 kHz 500 Hz 250 Hz 100 Hz and 15 Hz There are two ways the VT1413C can measure the excitation voltage while calibrating the SCP One way measures the voltages at the bridge connections remote sense and the other way measure the voltage locally at the connections in the Terminal Module The remote sense is more accurate but requires extra wiring to the bridge Figures 1 2 and 3 show examples of a typical 1 4 Br
12. value of the Voltage Value external excitation voltage The syntax for the command is SENSe STRain EXCitation excite v gt 0 lt ch list where excite v is the value of the external excitation voltage and cA list gt specifies the measurement channels of the SCP The default value ofthe excitation voltage is 3 9 V the minimum allowable voltage value that can be entered is 0 01 V and the maximum value that can be entered is 99 However the maximum allowable input voltage of the Sample and Hold Input Amplifier is 16V which may limit the maximum Excitaion Voltage to 16 V 20 NTISTIA Transient Strain SCP Using External Excitation Voltages Transient Strain SCP 0 1 BRIDGE SENS EXCITATION SENSE rOO04r01 7 9931703 3 DO WE Ola r 024 r 034 e GHLGHI A GHLGHL QG d n Poisson Full Bridge p 18689 GARG Meo C Ei KEST C g3J Voo Co1 J C o2J C 034 EXCITATION l BRIDGE COMPLETION Note The optional Shunt Resistor connection is shown by the dashed lines AS A SENSe STRain EXCitation lt excite_v gt lt ch_list gt External Excitation Voltage Figure 14 Connecting External Excitation Voltages Using External Excitation Voltages VTI511A Transient Strain SCP 21 Register Based Programming Appendix D ofthe VT1413C User s Manual covers the Register Based commands shown bel
13. 4 VT1511A Transient Strain SCP
14. 6E NEN c 000 ost 00 0t 00 09 00 SS OOS m oygi t e a RE S 00 01 I a BO 00 S uossiog abplug HeH VLLSLLA 9 0 y x WENS VT1511A Transient Strain SCP 31 Specifications 0 x ureng UU UC 00 07 00 01 00 0 00 01 00 07 00 0 UU CC 00 0 00 8C 00 97 UU PC 00 TT 00 0Z 00 81 00 91 00 f1 00 TI 00 01 00 8 00 9 c lt lt C eee pere e rene A O D D D D H D D A 00 01 93e oA uonelroxg CDD a aos een vomer A UU Z 23LIJOA uonelioxg S 00 0 9 01 X umns A 00 98810A uonejroxg Buipueg eBpug IINA VIISILA Specifications 32 VT1511A Transient Strain SCP g 01 X uieng A 00 0 93ei oA uonejroxg wassesss A 00 1 93e oA uonu oxs uossiog eBpug IINA VLLSLLA 00 0Z 00 0t 00 SS 7 00 0S 7 00 Sb 00 0t 00 SE DU UC 00 SC 000z UU SLS y 0001 00 S 00 0 9 01 x urs VT1511A Transient Strain SCP 33 Specifications 00 0p 00 07 00 0 00 0C 00 0p 01 X ureng 00 0S UU KF 00 0p 00 St 00 0 QU SC 00 07 n 00 si 00 01 A 00 01 282104 uonejroxg E ac hana kid Decio J 00 PPPOA OPPIIN OPT I OKK rr A 00 1 27610 A UONENOX 00 0 9 01 X uens uossiog Buipueg eBpug Ind VLLSLLA Specifications 3
15. COMPLETION Lar T Note The optional Shunt Resistor connection is shown by the dashed lines kisa a fi Figure 10 Typical 1 2 Bridge Connections Connecting To The Terminal Module VT1511A Transient Strain SCP 11 Full Bridge Use Figures 11 and 12 for Full Bridge connections to the Terminal Module Connections Remove or be sure the 1 4 Bridge Jumper s is not installed in the 1 4 Bridge configuration for all channels that are to make Full Bridge measurements see Figure 4 Transient Strain SCP 0 1 Top Sample BRIDGE SENSE EXCITATION SENSE zz CC 004 rOf4FO024r034r004rO014r02 m i AH 00947 CUT P0245 dE dE E TUA DODOSHLGHLGHI lt DOS H LG H LEES pf IAE ES YJ df Esses gt 17 DOC G G lt RRoRRoORRo lt 4 E erm 00 lt 01 lt 02 034 18 EXCITATION E BRIDGE COMPLETION Bottom Sample Kn p gt Note Bending Full Bridge The optional Shunt Cf Resistor connection C is shown by the gt dashed lines Note ot tation N Transient Strain SCP 0 1 10V EX vith 120 ort sup E Bridge BRIDGE SENSE EXCITATION SENSE onm FU 903013 10271037 7004 0153 p 027 033 GHLGH TT GHLGHLG N gt Poisson Full Bridge SCP G T DOG G G G wm iW 7 EQ
16. FF f 1 4 Bridge Full Bridge Strain Gage Strain Strain 3500 X01 Gage Gage 3500 X01 AAA gt De Rs 1200 X02 6 1200 X02 2 o F T Bridge X03 Bridge X03 xol Completion 4X04 Completion gt 1 Rs 29 4kQ T Strain Strain Rs 29 4kO 2 Y Gage Z Gage V gt Shunt it gt Shunt Current Flow EN Current Flow Switch ELS 1 2 Bridge Note rain Gage z 3500 X01 The current must flow into A e the Shunt Resistor E 1200 X02 as shown by the arrows Bridge X03 L Completion X04 Strain 29 4kQ Gage Z Q N N V Shunt FET Current Flow Switch OUTPut SHUNt ON Figure 13 Adding the Shunt Resistor Using The Shunt Resistor VT1511A Transient Strain SCP 19 Using External Excitation Voltages You can use your own external excitation voltage instead of using the internal voltage of the SCP If using an external voltage you must e use your own bridge completion circuitry e isolate the internal excitation supply from the bridge e enter the value of the excitation voltage into the VT1413C so it can make the correct EU conversions for strain measurements Connecting the Use Figure 14 to connect the external supply to the Terminal Module Be sure not External Supply to connect the external excitation voltage to the E and E terminals Enter Excitation Use the SENSe STRain EXCitation command to enter the
17. LGHLGHLGHLG G 6 6 6 GRAGHACARGAR O SCP 2 3 SCP 4 5 M G G 6 GRRGARGRRGRRG6 GLHGLHGLHGLHGLHGLHGLHOGLH x a beto tei Lees teg C46 J C472 C 482 C19 327 Ba 5 ja e EXCITATION BRIDGE COMPLETION J BRIDGE SENSE N EXCITATION SENSE a z 1 d a NI N Wes a A J Figure 5 VT1511A C Size Terminal Module Connections 8 VT1511A Transient Strain SCP Connecting To The Terminal Module BRIDGE SENSE EXCITATION SENSE 007 r014 r024 034 r004 014 r 024 034 SCP 0 1 EXCITATION 7 BRIDGE COMPLETION E04 p Eta CED p E34 p004 017 p 02 403 6 6 6 GYRcRRcGRRcRRc I HITTI EXCITATION 3 BRIDGE COMPLETION E164 rE174 rE184 fEl9 1641747 1847194 G 6 G G 6RR GRA GRR GRA H OO H p Ap B O Bi H l LILILI Lut LILILU LI LTS HTS LTI HTI GND LCALHCAL LO HI 52 LL OF OHMS o arnes O O Bee eee DO NOT USE CENTER BLOCK FOR CH 32 63 SCP 2 3 DGE SENSE EXCITATION SENSE b e r167r1 mas Mee GLHGLHGLHGLHGLHGLHGLHGLH 1 Figure 6 VT1511A B size Terminal Module Connections Ch 00 31
18. Manual Part Number 82 0085 000 Four Channel Transient Strain Signal Conditioning Plug on VT1511A Esc User s Manual The VT1511A manual also applies to Agilent HP E1413B as Agilent HP E1413 Option 21 Enclosed is the User s Manual for the VT1511A Signal Conditioning Plug on Insert this manual in your VT1413C or Agilent HP E1313 manual behind the Signal Conditioning Plug ons divider The VT1511A Four Channel Transient Strain SCP can be used with the VT1413C VT1415A and the Agilent HP E1313A and E1413B versions but not with the Agilent HP E1413A mu VXI Technology Copyright O VXI Technology Inc 2003 Printed July 9 2003 Printed in U S A Introduction Note VT1511A Four Channel Transient Strain Signal Conditioning Plug on VT1511A is a double wide i e takes the space of these two adjacent slots 0 1 2 3 4 5 or 6 7 Signal Conditioning Plug on SCP that provides 4 channels of strain measurements for the VT1413C High Speed A D Module The SCP provides 4 channels of Strain Completion Circuitry and Excitation Voltages a programmable filter and makes the strain measurements on 4 channels using the Sample and Hold method The SCP provides the strain completion circuitry and the Sample and Hold circuitry The SCP can be wired for measuring the Excitation Voltage at the bridge connection Remote Sense or locally on the Terminal Module The VT1511A Four Channel Transient Strain SCP can be used
19. V FF4446 for 1 V FF4816 for 2 V FF5046 for 5 V or FF6046 for 10 V Then write the opcode for SCBWRITE 081016 to the Command Register The values above will set the stated excitation values as well as the default state for the channel s Wagner Ground and Cal Shunt Resistor both disconnected Controlling Wagner To connect the Wagner Voltage to the LO terminal simply add the value 000216 to Ground the Excitation Voltage code sent in the procedure above Controlling Cal To shunt the bridge with the Cal Resistor add the value 000116 to the Excitation Shunt Resistors Voltage code sent in the procedure above Register Based Programming VTI511A Transient Strain SCP 23 Specifications SCP Current Requirements Amps 5Vmax 24Vtyp 24Vmax 24Vtyp 24Vmax 0 55 0 014 0 015 0 013 0 015 Voltage Measurements Accuracy Gain of X0 5 Range Gain Offset Noise FS error error 3 sigma 125 mV 0 02 488 u V 1 5 mV 0 5 mV 0 02 488 uV 1 5 mV 2 0V 0 02 488 uV 1 5 mV 8 0 V 0 02 488 uV 1 5 mV Temperature coefficients Gain 10 ppm C after CAL Offset add tempco error to above table Temp Tempco 0 30 0 u V C 30 55 0 75 uV C Accuracy Gain of X8 Range Gain Offset Noise FS error error 3 sigma 7 8 mV 0 02 30 5 u V 95 u V 31 25 mV 0 02 30 5 u V 95 u V 125 mV 0 02 30 5 u V 95 uV 0 5 V 0 02 30 5 u V 95 uV Temperature coefficients Gain 10 ppm C after CAL Offset
20. add tempco error to above table Temp Tempco 0 30 0 u V C 30 55 0 75 uV C 24 NTISTIA Transient Strain SCP Specifications Accuracy Gain of X64 Range Gain Offset Noise FS error error 3 sigma 3 9 mV 0 02 15 0 uV 12 uV 15 6 mV 0 02 15 0 uV 12 uV 62 5 mV 0 02 15 0 uV 12 uV Temperature coefficients Gain 10 ppm C after CAL Offset add tempco error to above table Temp Tempco 0 40 0 14 uV C 40 55 0 38 uV C Accuracy Gain of X512 Range Gain Offset Noise FS error error 3 sigma 7 81 mV 0 04 15 uV 2 u V Temperature coefficients Gain 10 ppm C after CAL Offset add tempco error to above table Temp Tempco 0 40 0 14 uV C 40 55 0 38 uV C Specifications VT1511A Transient Strain SCP 25 Filter Characteristics Normal mode rejection 15 Hz lowpass filter 6 pole Bessel 15 Hz 3 dB 50 Hz gt 33 dB 60 Hz gt 43 dB 100 Hz lowpass filter 6 pole Bessel 100 Hz 3 dB 400 Hz gt 43 dB 250 Hz lowpass filter 6 pole Bessel 250 Hz 3 dB 1000 Hz gt 43 dB 500 Hz lowpass filter 6 pole Bessel 500 Hz 3 dB 2000 Hz gt 43 dB 1000 Hz lowpass filter 6 pole Bessel 1000 Hz 3 dB 4000 Hz gt 43 dB Sample time skew between channels Because the lowpass filter precedes the sample and hold the interchannel sample time skew is primarily determined by the matching of the filter propagation delay times T
21. d make the measurements Use the VT1413C s INITiate and TRIGger commands to make the strain measurement You must define what triggers etc to use to make the measurements see the VT1413C User s Manual for information 16 VT1511A Transient Strain SCP Programming With SCPI Commands Comments How to Link EU Conversions to Channels Notes Purpose of Channel Tare Calibration CAL TARE The following explains the commands used in strain measurements The following explains the commands that link the strain EU conversion with the specified channels The commands tell the VT1413C to use the EU conversion for strain measurements The VT1413C performs the appropriate EU conversion e g 1 4 Bridge measurements depending on the command used Thus each bridge configuration has its own command with the command used for the 1 4 Bridge configuration as the default value See Linking Channels with EU Conversion in Chapter 3 of the VT1413C User s Manual The syntax of a typical command is SENse FUNCtion STRain HBENding range Q ch list where lt range gt gt is the voltage range ofthe VT1413C default value or no specified parameter is AUTO and cA list gt specifies the channels The different bridge types and corresponding EU to Channels Linking commands are in the following table Bridge Type Command Full Bending Bridge Full Bending Poisson Bridge Full Poisson Bridge 1 2 Bending Brid
22. e when the bridge is Unstrained The command syntax is SENSe STRain UNSTrained lt unstrained_v gt lt ch_list gt where lt unstrained v gt is the voltage value of the bridge in the unstrained position default is OV and lt ch_list gt specifies the channels to be measured Purpose of the Strain The SENse STRain GFACtor command specifies the gage factor to be used by the Gage Factor Command VT1413C to calculate the strain measurements The default value of the command is a STR GFAC factor of 2 The command syntax is SENse STRain GFACtor gage factor gt 0 lt ch list where gage factor gt is the gage factor value default is 2 and ch list specifies the channels to be measured Purpose of the Poisson The SENse STRain POISson command sets the Poisson ratio to be used by the Ratio Command VT1413C for EU conversion of strain values measured see Linking Channels with EU STR POIS Conversion in Chapter 3 of the VT1413C User s Manual This command is only needed if making Poisson strain measurements It is not needed for making 1 4 Bridge or 1 2 or Full Bridge Bending measurements The default value of the command is 3 The command syntax is SENse STRain POlSson poisson ratio gt O lt ch list where poisson ratio is the Poisson ratio default is 2 and lt ch list specifies the channels to be measured Connecting the Sample For 1 4 and 1 2 Bridge configurations the low input of the sample a
23. e readings for the specified channels Do this when the bridge is in the Unstrained configuration The commands are separated into two parts The first part configures and calibrates the excitation completion circuitry The second part configures the module for strain measurements Execute these commands when the bridge is in the Unstrained configuration Setup and Calibrate Excitation Completion Circuitry OUTP VOLT AMPL 1 100 103 select the excitation voltage value for channels 0 3 default is 0 V INP LOW FLO 100 103 selects the floating input INP FILT FREO 1000 100 103 selects the sample and hold lowpass filter freguency default is 15 Hz INP GAIN 8 100 103 selects the gain of the sample and hold circuitry default is 0 5 CAL TARE 100 103 measure the unstrained voltage on channels 0 3 CAL TARE to return the success flag from the CAL TARE operation enter CAL TARE query wait until success flag from CAL TARE operation is returned Configure the Measurement STR GFAC 2 100 103 specifies the gage factor on channels 0 3 selected factor 2 is the default value STR POIS 3 100 103 set Poisson ratio for EU conversion selected value is 0 3 default value FUNC STR FBP 1 100 103 link channel 0 3 to EU conversion for strain measurement selected voltage range is 1 V Bridge is Strained When the bridge is in the Strained configuration and the measurements are to be made scan the selected channels an
24. for its ID value write the following value to Parameter Register 1 the SCP SCP number x 40 Then write the opcode for SCPREAD 080016 to the Command Register The ID value will be written to the Response Register Read the Response Register for the value 22 VT1511A Transient Strain SCP Register Based Programming Setting the Filter To set the filter cutoff frequency for an SCP channel write the following SCP channel address to Parameter Register 1 Cutoff Freguency 20016 SCP number x 4046 SCP channel number x 816 216 Write one of the following cutoff values to Parameter Register 2 000046 for 15 Hz 000116 for 100 Hz 000216 for 250 Hz 000316 for 500 Hz 000416 for 1 kHz Then write the opcode for SCBWRITE 081016 to the Command Register Setting the Channel To set the amplifier gain for an SCP channel write the following SCP channel Gain address to Parameter Register 1 20046 SCP number x 4046 SCP channel number x 816 146 Write one of the following gain values to Parameter Register 2 FFFF16 for 0 5 FFF116 for 8 FFF246 for 64 FFF316 for 512 Then write the opcode for SCBWRITE 081016 to the Command Register Setting the Channel To set the excitation voltage for an SCP channel write the following SCP channel tati address to Parameter Register 1 Excitation Voltage 20016 SCP number x 4046 SCP channel number x 816 Write one of the following values to Parameter Register 2 FF0046 for O
25. ge 1 2 Poisson Bridge 1 4 Bridge SENse FUNCtion STRain FBENding SENse FUNCtion STRain FBPoisson SENse FUNCtion STRain FPOisson SENse FUNCtion STRain HBENding SENse FUNCtion STRain HPOisson SENse FUNCtion STRain QUARter 1 The strain readings from the VT1413C are output as micro strain ue units 2 Because of the number of possible strain gage configurations the driver must generate any Strain EU conversion tables and download them to the instrument when INITiate is executed This can cause the time to complete the INIT command to exceed 1 minute The CALibration TARE command measures the voltage across the bridge to determine the unstrained voltage value of the bridge This corrects for the offset voltage across the bridge when in the Unstrained configuration The command automatically executes the CAL command and thus calibrates the internal excitation supply Programming With SCPI Commands VT1511A Transient Strain SCP The VT1413C uses the unstrained reading 1 e offset voltage in conjunction with the strain gage factor see Purpose of the Strain Gage Factor Command STR GFAC below to calculate the strain measurements You normally perform both operations before making the actual strain measurements Instead of using CAL TARE you can use the SENSe STRain UNSTrained command to enter the unstrained voltage In this case you must measure and enter the offset voltage of the bridg
26. he table below lists the propagation delay for a step function input measured at 5096 of the final value for each filter setting as well as the matching between channels programmed to the same filter setting Bandwidth Step Propagation Delay Delay Matching nominal from nominal 1 kHz 427 5 us 10 us 500 Hz 854 9 usec 20 us 250 Hz 1 710 ms 40 us 100 Hz 4 275 ms 100 us 15 Hz 28 50 ms 670 us Maximum filter overshoot lt 1 of input step size 26 VT1511A Transient Strain SCP Specifications Common mode rejection 0 to 60 Hz X0 5 gain gt 60 dB X8 gain gt 78 dB X64 gain gt 100 dB X512 gain 7100 dB Maximum input voltage normal mode plus common mode Operating 16 V peak Damage level gt 42 V peak Maximum common mode voltage Operating lt 16 V peak Damage level gt 42 V peak Crosstalk referenced to input 350 Q source DC to 1 kHz 80 dB 20 log receiving channel input source channel gain e g crosstalk from channel at gain of 0 5 to channel at gain 512 80 dB 20 log 512 0 5 140 dB Input impedance 2100 MQ Maximum tare cal offset X0 5 gain 25 of full scale X8 gain 90 mV X64 gain 95 mV X512 gain 95 mV Specifications VTI511A Transient Strain SCP 27 Sample and Hold Characteristics Acquisition Time l us Aperature Time 2ns Aperature Delay 35 ns delay in skew specifica
27. idge 1 2 Bridge and Full Bridge strain gage measurement respectively The figures also show the calibration shunt resistor connects to the bridge When shunt calibration is enabled the shunt resistor is switched in parallel to one leg of the bridge This causes a change in the bridge output voltage Use it to check the bridge wiring 4 VTI511A Transient Strain SCP VT1511A Operation Transient Strain SCP Terminal Module _ Wensentoran ovr To I Bridge amp Excitation Sense LI ug rast INPUtFILTer LPASs FREQuency i a H gt 11 lt _ f a l Note i su lt a Filter Sample Hold creut H The optional Shunt ri 2 ense qo Amplifier gt N gt gt 5 Resistor connection P d LIZ I is shown by the l 211 Pd 1 V I L dotted line 11 10 o T Z GND KI V l Sol A E S Z I Fi Strain Gage a H 1 H 14 Excitation 11 I 1 Sense 1 E l j o L gt I 44 proe aana 1 11 Switch closed INPut LOW WVOLtage i for 1 4 Bridge E I I La ja E Er l Saxo l i i Ua D i I Excitation OUTPut VOLTage AMPLitude SoS Excitation E lt SPO Voltage I lt _ at l
28. nd hold input and Hold Amplifier amplifier should be connected to the negative side ofthe internal bridge connection on Input INPut LOW the SCP itself This is done by a switch on the SCP which provides the Wagner voltage for the bridge see Figures 1 and 2 For Full Bridge configuration the low input of the sample and hold amplifier should be externally connected to the negative side of the bridge The amplifier input must not be connected to the internal bridge see Figure 3 Use the following command for either configuration INPut LOW lt volt_type gt lt ch_list gt 18 VT1511A Transient Strain SCP Programming With SCPI Commands where volt type can be either FLOat for a floating input Full Bridge configuration or WVoltage for a Wagner Voltage connection 1 4 and 1 2 Bridge configurations respectively and lt Och list specifies the channels Using The Shunt Resistor To check if the bridge is operational you can add a 29 4 kQ Shunt resistor across one leg ofthe bridge as illustrated in Figure 13 A FET switch adds or removes the resistor When the resistor is added it changes the unstrained offset voltage on the bridge The resistor can only affect the bridge balance as long as you follow the connections shown in the dotted lines in Figures 1 2 and 3 or as shown in Figure 13 Use the OUTPut SHUNt command to add or remove the resistor from the bridge The syntax of the command is OUTPut SHUNt 1 0 ON O
29. nt HP E1313 Terminal Moduless use stickers for VT1510A SCPs The connections are shown in Figures 6 and 7 e For Agilent HP E1413B and below Terminal Modules use stickers for Agilent HP E1413 Option 20 SCPs The connections are shown in Figure 8 ON Ji Gini EE BOARI 2 EXCITATION BRIDGE COMPLETION gt a BRIDGE SENSE EXC TATION SENSE o REM Q o 004 015 r024 r034 007017 024 03 us E484 E494 ESO CESt r484 p 494 P 5 A 0001 1017 r 025 035 004 r 017 r 027 r 037 i AR Q D HLGHLGHLGHLGHLGHLGHLGHLG G 6 6 6 GRAGARCRAGRA O O h SCP 0 1 UU D00000000000 SCP 6 7 4 064 04 0 GRRcRRcCRRGRRgc P s GLHGLHGLHGLHGLHGLHGLHGLH H J a Eo C gi Kea J bess Loo JU 013 C 024 Coal Lag 49 2 A a Len JL 514 A H A L EXCITATION L_BRIDGE COMPLETION J L BRIDGE sense L EXCHATION SENSE 2 H x EXCITATION BRIDGE COMPLETION O 7 BRIDGE SENSE EXCITATION SENSE E FR 11 a li E325 E E34 es Las 333 r 344 J 9 oA r169 717971847194 716471747184 197 E32 E331 E34 E35 RA a C FALHA O HLGHLGHLGHLOH
30. ow You should read that appendix to become familiar with accessing registers and executing Register Based commands This section relates those commands to the parameter values that are specified for this SCP When Register Programming an SCP most communication is through the Signal Conditioning Bus For that you will use the Register Commands SCPWRITE lt regaddr gt and SCPREAD lt regaddr gt lt regvalue gt Read returned value Write lt regvalue gt SCP Register lt regaddr gt Value SCP ID source Opt 21 610016 Whole SCP Reg 0 00ppp0000002 SCP Gain Scale XXX316 Whole SCP Reg 1 00ppp0000012 Excitation Wagner Voltage and Shunt Cal Resistor Channel Reg O 01pppccc0002 Data format is XEVVVVWS where X don t care E enable excitation voltage 1 on 0 off V Excit V bits 00012 1V 00102 2V 01002 5V 10002 10V W Wagner Voltage to LO 1 connected 0 disconnected S Shunt Cal Resistor 1 in circuit 0 out Channel Gain Sample and Hold channels Channel Reg 1 Olpppecc0012 FFFF 16 0 5 FFF116 8 FFF216 64 FFF316 512 Channel Gain direct channels 000016 1 Channel Frequency XXX016 15Hz XXX116 100Hz Channel Reg 2 Olpppecc0102 XXX216 250Hz XXX316 500Hz XXX416 1kHz X don t care ppp Plug on ccc SCP channel see the SCPWRITE and SCPREAD commands in Appendix D to learn more on how to read the SCP regisaters Checking the ID of To query an SCP
31. tion Aperature Jitter 150 ps Droop Rate 1 Volt s 50 C Typical is 2 3 mV s 25 C This is referenced to the SCP output so divide by SCP gain setting 28 NTISTIA Transient Strain SCP Specifications 01 X weng HILDA A 00 L Beyo uongjox3 00 09 00 0p UU UC 0070 00 07 000v 00 09 00 S8 00 08 00 SL 00 0L 00 S9 mtas E 0009 00 SS 00 0S mena 00 S A4 r 00 0r R ncm de 00 SE i G i ee 000r rr OH 1 00 st Tiz si E PH 1 00 01 A A 00 S 9 01 x ureng eDpug 1914END VLLSLLA VTI511A Transient Strain SCP 29 Specifications c 0t X Weg M eshsh hh assa ht hs h nana na hhmhha snnm 000 0007 0001 000 O00I 0007 000 2 00 9 ai osse NE Mee 00 0 08 009t 00 vZ NE ua k gt 00TT r 0007 00381 gu m MN ra pe 0091 gt f me OE PIA 00 00 01 FJ r li scan YO OF e 9 01 x utens Guipuag eBpiug HeH VLLSLLA Specifications 30 VT1511A Transient Strain SCP 01 x ureng A 00 01 982 04 uontroxg sa n lt e AAA A 00 1 BoA uonejroxg 00 0p 00 07 00 0 nan kisassa 00 07 E DUS 000 E 00
32. with the VT1413C VT1415A and the Agilent HP E1313A and E1413B versions but not with the Agilent HP E1413A About This Manual Except where noted references to the VT1413C also aply to the VT1415C and Agilent HP E1313 This manual shows how to connect to the Terminal Module for sample hold strain measurements and also shows how to control the Option 21 Signal Conditioning Plug on SCP using SCPI commands and Register Based commands The following also explains the capabilities of the SCP and gives the specifications The manual contents is Introduction VT1511A Transient Strain SCP 3 VTISIIA Operation oa e e oe e e ae oe a a ee N Selecting the 1 4 Bridge and 120 350 Ohm Jumpers Connecting To The Terminal Module e Programming With SCPI Commands 2 042 Using External Excitation Voltages L Register Based Programming llle Specifications 3 244 46 005 446 40 2 ob E E wa bard VT1511A Operation There are two circuits on the VT1511A SCP one circuit provides the Bridge Excitation Voltage and Bridge Completion circuitry and the other circuit provides the sample and hold measurement circuitry The completion circuitry can output a Bridge Excitation voltage of 0 V 1 V 2 V 5 V or 10 V on each channel Note The 10 V Excitation level can not be used with a 120 2 Full Bridge configuration This low impedance bridge configuration draws too much current from the excitation supply at 10 V 250
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