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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT

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TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988

www.ietlabs.com

534 Main Street, Westbury, NY 11590

IET LABS, INC.

PRS-200 SERIES

High Precision

Manual or SCPI Programmable

Decade Resistance Substituters

(IEEE-488.2 or RS232)

Operation Manual



2005 IET Labs, Inc.

PRS200 IEEE.2 im/October, 2005

Summary of Contents for PRS-200 Series

Page 1: ...99 8438 FAX 516 334 5988 www ietlabs com 534 Main Street Westbury NY 11590 IET LABS INC PRS 200 SERIES High Precision Manual or SCPI Programmable Decade Resistance Substituters IEEE 488 2 or RS232 Operation Manual Copyright 2005 IET Labs Inc PRS200 IEEE 2 im October 2005 ...

Page 2: ... PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT TEL 516 334 5959 800 899 8438 FAX 516 334 5988 www ietlabs com 534 Main Street Westbury NY 11590 IET LABS INC ...

Page 3: ... at no charge when returned to IET Changes in this product not approved by IET or application of voltages or currents greater than those allowed by the specifications shall void this warranty IET shall not be liable for any indirect special or consequential damages even if notice has been given to the possibility of such damages THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED...

Page 4: ...ARE USED TAKE ALL MEASURES TO AVOID ACCIDENTAL CONTACT WITH ANY LIVE COMPONENTS USE MAXIMUM INSULATION AND MINIMIZE THE USE OF BARE CONDUCTORS WHEN USING THIS INSTRUMENT Use extreme caution when working with bare conductors or bus bars WHEN WORKING WITH HIGH VOLTAGES POST WARNING SIGNS AND KEEP UNREQUIRED PERSONNEL SAFELY AWAY CAUTION DO NOT APPLY ANY VOLTAGES OR CURRENTS TO THE TERMINALS OF THIS ...

Page 5: ... 3 2 4ThermalemfConsiderations 6 3 3DialSetting 7 3 4EnvironmentalConditions 7 3 5 Local Operation 7 3 6 Remote Operation 7 Chapter 4 BCD INTERFACE OPTION 8 4 1BCDProgramming 8 Chapter 5 IEEE INTERFACE OPTION 10 5 1Introduction 10 5 2Capabilities 10 5 3AddressSwitchandCommunicationsSettings 10 5 4 IEEE Option Operation 10 5 5 GPIB Test Keyboard 11 Chapter 6 SERIAL INTERFACE OPTION 12 6 1Introducti...

Page 6: ...ialization 15 7 3 3 Source Impedance 16 Chapter 8 MAINTENANCE 17 8 1VerificationofPerformance 17 8 1 1CalibrationInterval 17 8 1 2 General Considerations 17 Appendix A 18 SCPI Command Reference 18 Appendix B 20 IEEE 488 2 COMMON COMMANDS 20 Figures FIGURE 2 1 Typical OPERATING GUIDE Affixed to Unit 5 Tables Table 4 1 BCD INPUT Connector 8 Table 4 2 BCD INPUT Connector Pin Assignments 9 ...

Page 7: ...si tion for each decade The PRS Series employs very low resistance low thermal emf relays with gold clad silver alloy con tacts A special design keeps contact resistance to a minimum The gold plating keeps the silver contacts from becoming tarnished when unused or when only low currents are passed through them This is most often the case when only minute test currents are drawnbydigitalmultimeters...

Page 8: ...2 INTRODUCTION PRS Series This page is intentionally left blank ...

Page 9: ... GND terminal on front panel is connected to both chassis and earth ground Operation Unit should be allowed to stabilize for one hour For maximum stability allow unit to warm up over two hours and keep free from mechanical disturbances Observeallsafety ruleswhenworkingwithhighvoltagesorlinevoltages Connecttheshieldtoearthground in order to maintain the case at a safe voltage Whenever hazardous vol...

Page 10: ...m perature difference between the leads of the relay and the contacts when temperature is applied to the coil This emf is of the order of 5 µV per relay but is not usually additive The typical worst case is 15 µV 3 1 Initial inspection and setup This instrument was tested and carefully inspected before shipment It should be in proper electrical and mechanical order upon receipt An OPERATING GUIDE ...

Page 11: ...ption is present the READY and LOCAL indicators should il luminate 2 SettheREMOTE LOCALswitchtoLOCAL 3 Connect any desired instrumentation to the front panel binding posts The GND termi nal may be connected to the ground of ex ternal equipment TheGNDterminal is con nected to the case and to both chassis and earth grounds 4 Make 4 terminal or 2 terminal connections as described previously A shielde...

Page 12: ...and 22 on the BCD INPUT rear panel connector as shown in Table 4 1 Note that both pins must be set The REMOTE and LOCAL led s will respond accordingly Once the PRS is set to Re mote the thumbwheel switches become disabled and impedance control is transferred to the rear panel connector In addition two special optional function pins are pro vided to set the unit to Open circuit or optional Short ci...

Page 13: ...0 kΩ 13 8 20 1 19 2 18 4 l 9 M Ω 17 8 29 1 28 2 27 4 10 90 M Ω 26 8 34 O p en circuit control 35 Short circuit control op tional 23 Earth ground 24 5V l0 mA maximum 25 Earth ground 21 LO CA L R EM O T E select 22 LO CA L R EM O T E select 48 Reserved for IEEE 488 49 Reserved for IEEE 488 50 Reserved for IEEE 488 Low for LO CA L H igh for R EM O T E Des cription Low to activate otherw ise high or o...

Page 14: ...ary commands for training and testing See Section 5 5 5 2 Capabilities The IEEE option provides remote control over all func tions except POWER Decimal Address SWITCH SETTINGS 5 4 3 2 1 Decimal Address SWITCH SETTINGS 5 4 3 2 1 0 0 0 0 0 0 16 1 0 0 0 0 1 0 0 0 0 1 17 1 0 0 0 1 2 0 0 0 1 0 18 1 0 0 1 0 3 0 0 0 1 1 19 1 0 0 1 1 4 0 0 1 0 0 20 1 0 1 0 0 5 0 0 1 0 1 21 1 0 1 0 1 6 0 0 1 1 0 22 1 0 1 1...

Page 15: ...rogram auto matically finds your device at start up and it lets you enter just the data that you want to send to the de vice This program works with ICS Measurement Computing and National Instruments controllers To implement request a download of ICS_GPIBkybd_Install zip from IET Labs Tech Support Unzip the file and follow instructions to install Open the application You may use the Find Listen er...

Page 16: ...oller returns CR LF and as a prompt after executing any command Echo back RS232 Message Mode Prompt Terminator On CR LF CR LF Off LF LF 6 1 Introduction The SERIAL option adds RS 232C and SCPI 1994 0 capability to the PRS series instruments The SCPI standard provides a tree like series of standard com mands for programmable instruments so that similar instruments by different manufacturers can be ...

Page 17: ...st the data that you want to send to the de vice This program works with ICS Measurement Computing and National Instruments controllers To implement request a download of ICS_Serkybd_Install zip from IET Labs Tech Support Unzip the file and follow instructions to install Open the application Initialize the COM PORT and use the Device Command window to send a com mand string to the PRS where the co...

Page 18: ... 0 4 8 or absent for NORMAL operation 1 5 or 9 for OPEN CIRCUIT operation optional 2 3 6 or7forSHORTCIRCUIT operation optional 7 1 Introduction PRS 200 units equipped with IEEE or SERIAL op tions implement a consistent SCPI interface A SCPI command reference is included in Appendix A 7 2 Command String Structure Output is controlled in the form of a single SCPI com mand followed by a space and a 1...

Page 19: ...he PRS has been encoded to provide information about the char acteristics of the specific instrument being used For example a IDN query to a PRS might return IET Labs PRS 200 F 6 100m 0 0 D6 0211201 D6 In our example above the Manufacturer section con tains IET Labs the Model section contains PRS 200 F 6 100m 0 0 the Serial Number section D6 0211201 and the Revision section D6 The model is split i...

Page 20: ...1 Example 2 let iModel 1 model 202 system board let iValue equal 1 000 000 iValue is 99 999 9 if iOption 1 or 3 then iValue 100 000 0 else iValue 99 999 9 Multiply iValue by one over iMin to shift the digits below the operating range of the PRS to the right of the decimal point in this case 10 Select the integer portion of iValue Example 1 iValue iValue 1 iMin iValue 123 51 1 1 or iValue 1235 1 iV...

Page 21: ...f uncer tainty of the instrument itself the test setup and the environment consult IET Labs for information It is important to allow both the testing instrument and the PRS Substituter to stabilize for a number of hours at the nominal operating temperature of 230 C and at nominal laboratory conditions of humidity There should be no temperature gradients across the unit under test In the case of a ...

Page 22: ... and EOI terminates a RESPONSE MESSAGE Asterisk defines a 488 2 common command Ends a query where a reply is expected SCPIbuildsontheprogrammingsyntaxofIEEE 488 2 to give the programmer the capability of handling a wide variety of instrument functions in a common manner This gives all instruments a common look and feel SCPI commands are not case sensitive The portion of commands shown in capitals ...

Page 23: ...Rial SERIAL option only EXTernal 0 1 or OFF ON 0 BAUD numeric value 9600 PARity EVEN ODD NONE BITS 7 8 SBITs 1 2 NETwork 0 1 or OFF ON 0 ADDRess 0 15 4 UPdate no value command only RS485 0 1 or OFF ON 0 ERRor 0 No error VERSion 1994 0 SOURce Port Output DIGital DATA VALue 10 digits representing PO the possible decade values CALibrate Calibrate DATe mm dd yyyy ...

Page 24: ...the state 1 or 0 of bits in the register Reading of this register resets the contents to zero Bit Description 7 Power On 6 User Request 5 Command Error 4 Execution Error 3 Dev Dep Error 2 Query Error 1 Request Control 0 Operation Complete IDN Identification Query Returns its identification code as four fields separated by commas These fields are manufacturer model serial number and hardware versio...

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