Eight-Channel Current Source Signal Conditioning
Contents
1. Figure 2 VT1505A C Size Terminal Module Connections Connecting To The Terminal Module VT1505A Current Source SCP 5 00 01 02 r 03 1r 04 r 05 r 06 r 07 HLGHLGHLGHLG HLGHLGHLGHLG SCP O Lees ts ss fs ts A o SCP LIS HIS LIT HT a GND LCALHCAL LO HI 52 ss QE OHMS Bae eee Ex O O Boe eee DO NOT USE CENTER BLOCK FOR CH 32 63 SCP 1 SCP 2 085 095 104 115 124 134 145 15 gt J 167 1177 1847194 2071212223 r23 HLGHLGHLGHLGHLGHLGHLGHLG GLHGLHGLHGLHGLHGLHGLHGLH OI Figure 3 VT1505A B size Terminal Module Connections Ch00 31 O O 322333 13471357 13671 372 F38 7 r 392 HLGHLGHLGHLG HLGHLGHLGHLG LI LCALHCAL LO HI Ls OHMS DN SCP 4 LILI LILI iTS HIS LTI HTI IEEE BAAJS RR DO NOT USE CENTER BLOCK FOR CH 32 63 SCP 5 SCP 6 407 4171 42714371447 r457 4671477 r48 r49 r50 r514 15271537 547 y 557 HLGHLGHLGHLGHLGHLGHLGHLG GLHGLHGLHGLHGLHGLHGLHGLH Figure 4 VT1505A B size Terminal Module Connections Ch 32 63 m SCP O SCP 2 SCP 5 RLELHL GGNALHLHLHL GG Lo54L06ILO7 ILGOI L20IL 2412. channels 16 through 31 to measure 8 kQ or greater send OUTP CURR AMPL 30ua 116 131 To query any channel to determine the current level use the OUTPut CURRent AMPLitude lt channel gt command The OUTP CURR command returns either 4 88E 4 or 3 0E 5 e The channel parameter must specify a single channel To query the current level of channel 2 send OUTP CURR AMPL 102 query channel 2 enter statement here returns 4 88e 4 or 3 0e 5 To Disable and re enable the current source channel use OUTPut CURRent STATe lt enable gt lt ch_list gt command e The enable parameter can take the values ON or 1 and OFF or 0 To disable current source channels 0 through 15 and 20 send OUTP CURR STAT OFF 100 115 120 To enable current source channels 16 through 31 send OUTP CURR STAT ON 116 131 The RST and Power On state for all Current Source SCP channels is OFF To query any channel to determine the current source output state use the OUTPut CURRent STATe lt channel gt command The OUTP CURR command returns either a 1 for ON or a 0 for OFF e The channel parameter must specify a single channel To query the current state of channel 2 send OUTP CURR STAT 102 query channel 2 enter statement here returns or 0 VT1505A Current Source SCP Programming With SCPI Commands Register Based Programming Checking ID of SCP Controlling Current Source Channels The register based commands shown here a
3. 0221233162 HL HL HL HL HLIJH LAL AL HEL LQOILO1IJLO2 JLO3BILO4 4 16 44 17 JL 18g YL 19 J SCP 1 SCP 3 HL HL GGIHL EH GG Lyg Jb LG L393 JL G34 O SCP 7 H GGLHL LHLH IGG LALA UG5 3403041 30423143 3673563573158 L A LH LH L44IL45 IL 4647 J L HAL A Lk A Lak Le a L H LH L59JL60IL 617462 JL 63 SCP 4 SCP 6 GGbLH LH G47 32 337 G67 48 7 497 GGL HLH fel le AE ad le HLH ELHAL LHE LH L H LH LH LH Ly JL yb 434 L97JL 9280991 U34IL35I5L 36 4 L5QIL5 21597 7084 094 102 2425226 37a r383 6806458 HL HL HAL HL HL HL O LH LH LH LH LH LH C Figure 5 Agilent HP E1413 Option 15 Terminal Module Connections 32 63 6 VT1505A Current Source SCP Connecting To The Terminal Module Programming With SCPI Commands The SCPI commands shown here are covered in Chapters 3 and 5 of your VT1413C or Agilent HP E1313 manual This section will relate those commands to the parameter values which are specific to this Plug on Checking the ID To verify the SCP type s installed on the VT1413C or Agilent HP E1313 of the SCP use the SYSTem CTY Pe lt channel gt command e The channel parameter specifies a single channel in the channel range covered by the SCP of interest The first channel number for each of the eight SCP positions
4. Eight Channel Current Source Signal Conditioning Plug on VT1505A User s Manual The VT1505A manual also applies to Agilent HP E1413Bs as Agilent HP E1413 Option 15 Enclosed is the User s Manual for the VT1505A Signal Conditioning Plug on Insert this manual in your VT1413C or Agilent HP E1313 manual behind the Signal Conditioning Plug ons divider vx CE Technology Copyright VXI Technology Inc 2003 Manual Part Number 82 0080 000 Printed June 16 2003 Printed in U S A VT1505A Current Source Signal Conditioning Plug on Introduction The VT1505A is a Signal Conditioning Plug on that provides eight current sources programmable to one of two current levels Each current source can be programmed to provide either 30 yA or 488 uA Also provided is input over voltage detection on each channel About this Manual This manual shows you how to control the Signal Conditioning Plug on SCP using SCPI commands as well as Register Based commands and explains the capabilities of this SCP Finally it covers specifications for this SCP Installation for this Plug on is common to several others and is covered in Chapter 1 your VT1413C or Agielnt HP E1313 manual The contents of this manual are Field Witt 35e eme ue ns a eae da 3 e Connecting To The Terminal Module 5 e Programming With SCPI Commands 7 e Programming With Register Commands 9 e Specificatio
5. are 0 8 16 24 32 40 48 and 56 The value returned for the SCP in an Agilent HP E1413B is HEWLETT PACKARD E1413 Opt 15 8 Channel Current Source SCP 0 0 The value returned for the SCP in a VT1413C or Agilent HP E1313A is HEWLETT PACKARD E1505 8 Channel Current Source SCP 0 0 To determine the type of SCP installed on channels 0 through 7 send SYST CTYP 100 query SCP type ch 0 enter statement here enter response string Setting Current To set the current output level use the Output Level OUTPut CURRent AMPLitude lt level gt lt ch_list gt command e The level parameter can set the current output level to either 30 yA or 488 uA The default unit for level is Amps DC You may also include a units suffix to specify milliamps ma or microamps ua The level parameter will also accept MIN 30 uA and MAX 488 wA Use 488 wA for resistance measurements under 8000 Q and 30 yA for resistances of 8000 Q and greater Notes 1 30 yA is the RST and Power On amplitude for all filter channels 2 Whenever you change the current amplitude you must execute CAL or CAL SETup then CAL SETup to calibrate the newly selected output amplitude To set channels 0 through 15 and 20 to measure lt 8 kQ send OUTP CURR AMPL 488E 6 100 115 120 Programming With SCPI Commands VT1505A Current Source SCP 7 Querying the Current Level Turning Current Source Channels Off and On Note Querying the Current Source State To set
6. nA C 10 VT1505A Current Source SCP Specifications Resistance Specifications 90 days 23 C 1 C with CAL done after 1 hr warm up and CAL ZERO within 5 min Range Current A D Range VDC Maximum Ohms FS Amplitude yA Resolution Q 131 1k 30 518 4 4 32 77k 30 518 1 1 8 192 k 30 518 0 25 0 25 8 192 k 488 28 4 0 25 2 048 k 488 28 1 0 0625 512 488 28 0 25 0 015 128 488 28 0 0625 0 0039 Resistance Accuracy Four Wire connection Gain Current Resistance Amplitude Accuracy 30 518 uA 0 035 of reading 488 28 uA 0 02 of reading Offset Q offset of input SCP in Volts current source value in Amps Noise Q noise of input SCP in Volts current source value in Amps Specifications VT1505A Current Source SCP 11 Notes 12 VT1505A Current Source SCP Specifications
7. ns 10 Field Wiring The VT1505A SCP is used to supply excitation current to resistance and resistance temperature measurements Figure 1 shows the general method of connection for both 4 wire and 2 wire connections Introduction VT1505A Current Source SCP 3 Two Wire Measurement Four Wire Measurement not recommended Current Source SCP Current Source SCP 5 HI Field Wiring HI Field Wiring S 150 Ohm 5 R O Q di y o LO LO o 150 Ohm 5 Because of the 150 Ohm resistor in series with each of the current source outputs Two Wire resistance and temperature measurements will have a 300 Ohm offset Any Sense SCP a Hl The current source HI terminal is the negative voltage node The current source LO terminal is the positive voltage node y o 8 2 LO 10 Figure 1 Wiring for Resistance and Temperature 4 VT1505A Current Source SCP Field Wiring Connecting To The Terminal Module This section shows how to make 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 VT1505A SCPs The connections are shown in Figure 2 e For Agilent HP E1313 Terminal Modules
8. re covered in Appendix D ofthe VT1413C or Agilent HP E1313 manual You should read that section first to become familiar with accessing registers and executing Register Based Commands This section will relate those commands to the parameter values which are specific to this Plug on When Register Programming an SCP most communication is through the Signal Conditioning Bus For that we ll use the Register Commands SCBWRITE lt regaddr gt lt regvalue gt and SCBREAD lt regaddr gt VT1505A Register Map Read returned value Write lt regvalue gt SCP Register lt regaddr gt Value SCP ID A0A016 Whole SCP Reg 0 OOppp0000002 SCP Gain Scale XXX016 Whole SCP Reg 1 00ppp0000012 Channel Control XXX016 Off amp Low Channel Reg 0 01pppccc0002 XXX116 Off amp High XXX216 On amp Low XXX316 On amp High Channel Gain XXX016 Channel Reg 1 01pppccc0012 Calibration Xnnn36 Channel Reg 7 01pppccc1112 where nnn Cal Value XX don t care ppp Plug on ccc SCP channel To query an SCP for its ID value write the following value to Parameter Register 1 SCP number x 40 Then write the opcode for SCBREAD 080016 to the Command Register The ID value will be written to the Query Response Register To set current amplitude and enable or disable an SCP channel write the following SCP channel address to Parameter Register 1 200 SCP number x 40 SCP channel number x 8 Write one of
9. s use stickers for VT1505A SCPs The connections are shown in Figures 3 and 4 e For Agilent HP E1413B and below Terminal Modules use stickers for Agilent HP E1413 Option 15 SCPs The connections are shown in Figure 5 7 H Q On lO O H Q a o BOAR a DE ps Q af REM O a il F005 014 7025 035 045 055 065 07 r56 15771587 597 6071617 6257635 O _ A JHLGHLGHLGHLGHLGHLGHLGHLG GLHGLHGLHGLHGLHGLHGLHGLH 0 q NT IHLOHLGHLGHLOHLGHLGHLGHLO nn GLHGLHGLHGLHGLHGLHGLHGLH O posd bogs ttotbartbaatbistbasttis4 Lag b4gttso L517L52L531L54L55 q O O A D D m a 5 D A a 1 a JU E E O lri67 r177r187r19f207 217 227 r 237 407 1417 4271437 1447114871467 4751 O O HLGHLGHLGHLGHLGHLGHLGHLGI GLHOLHGLHGLHGLHGLHGLHGLH D O IHLGHLGHLGHLGHLGHLGHLGHLG GLHGLHGLHGLHGLHGLHGLHGLH Y A fag 4 L25 1 Log J L27 J Lg 4 L29 J L30 4 L31 4 L321L3341L341L351L361L37L38 2L39 a Q 09 10 NN A f U fl Y f H j
10. the following control values to Parameter Register 2 000016 current low output off 000116 current high output off 000216 current low output on 000316 current high output on Then write the opcode for SCBWRITE 081016 to the Command Register Register Based Programming VT1505A Current Source SCP 9 Channel Calibration Register The channel calibration registers control DACs that adjust the current output of each current source channel The Register Based command CARDCAL 100016 controls these registers and the user should not write to them Specifications The general specifications for the VT1505A reflect the performance of the Signal Conditioning Plug on itself The resistance performance specification reflects the combined performance of the VT1413C or Agilent HP E1313 and the SCP General Specifications Compliance L terminal is at ground H terminal 16 V with respect to ground Output Accuracy 90 days 23 C 1 C with CAL done after 1 hr warm up Current Output Amplitude uA Accuracy 30 518 9 nA 488 28 60 nA Temperature Coefficient Current Temperature Amplitude uA Coefficient 30 518 0 9 nA C 488 28 6 nA C Ripple and Noise 7 5 kQ resistor to L 3 sigma Current Ripple and Amplitude uA Noise 30 518 9 nA 488 28 15 nA Off Leakage Current 7 5 kQ resistor to L 0 30 C 30 55 C Less than 10 nA 10 nA 1 6
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