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IET Labs PRS-202 Series Operation Manual

High precision manual or scpi programmable decade resistance substituters
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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
PRS-202 SERIES
High Precision
Manual or SCPI Programmable
Decade Resistance Substituters
Operation Manual
Copyright  2002 IET Labs, Inc.
PRS202 IEEE.2 im/October, 2002
IET LABS, INC.
www.ietlabs.com
534 Main Street, Westbury, NY 11590
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988

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  • Page 1 PRS-202 SERIES High Precision Manual or SCPI Programmable Decade Resistance Substituters Operation Manual Copyright  2002 IET Labs, Inc. PRS202 IEEE.2 im/October, 2002 IET LABS, INC. www.ietlabs.com 534 Main Street, Westbury, NY 11590 TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988...

  • Page 3: Table Of Contents

    CONTENTS WARRANTY ......................i WARNING ......................ii CAUTION ......................ii CONTENTS ......................iii FIGURES ......................iv TABLES ....................... iv Chapter 1: INTRODUCTION ................1 Chapter 2: SPECIFICATIONS ................3 2.1 Model Configuration and specifications ................ 3 2.2 General specifications ....................4 Chapter 3: OPERATION ..................
  • Page 4 Chapter 7: PROGRAMMING ................12 7.1 Introduction ......................... 12 7.2 Command String Structure ..................12 7.3 Advanced Programming - Software Drivers .............. 13 7.3.1 Determining the PRS Configuration ............13 7.3.2 Instrument Initialization ................13 7.3.3 Source Impedance ..................14 Chapter 8: MAINTENANCE ................

  • Page 5: Warranty

    WARRANTY We warrant that this product is free from defects in material and workmanship and, when properly used, will perform in accordance with applicable IET specifications. If within one year after original shipment, it is found not to meet this standard, it will be repaired or, at the option of IET, replaced 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.

  • Page 7: Chapter 1: Introduction

    Operation is both local using convenient direct read- ing front panel thumbwheel switches, and remote with The PRS-202 Series may be rack mounted to serve optional parallel BCD or IEEE-4888 interfaces. Both as components in measurement and control systems.
  • Page 8 PRS-202 Series This page is intentionally left blank. INTRODUCTION...

  • Page 11: Chapter 2: Specifications

    PRS-202 Series PRS-202 SERIES OPERATING GUIDE CONSULT INSTRUCTION MANUAL FOR PROPER INSTRUMENT OPERATION Resistance Type: Resistance wire for 0.1 Ω steps and below; hermetically sealed, wirewound, low-inductance resistors for 1 Ω to 100 kΩ steps; precious metal-oxide film resistors for 1 MΩ steps and over.

  • Page 12: Chapter 3: Operation

    3.2.1 General Considerations 3.2.3 Four-Wire Kelvin Lead Connections The PRS-202 Series Decade unit is available in three 4-wire Kelvin leads minimize the effects of contact or five terminal versions. The binding posts are stan- resistance and approach ideal performance.

  • Page 13: Dial Setting

    PRS-200 Series If the effect of tens of microvolts are significant to Set the REMOTE/LOCAL switch to LO- your application, connect to the instrument with low CAL. thermal emf materials only. Copper wire and copper alloys are recommended, whereas brass and steel Connect any desired instrumentation to the should be avoided.

  • Page 14: Chapter 4: Bcd Interface Option

    PRS-200 Series Chapter 4 BCD INTERFACE OPTION must be set. The REMOTE and LOCAL led’s will 4.1 BCD Programming respond accordingly. Once the PRS-202 is set into Remote, the thumbwheel switches become disabled, All PRS-202 units come with a BCD (Binary Coded and impedance control is transferred to the rear panel Decimal 1-2-4-8 coding) remote programming capa- connector.

  • Page 15: Table 3.2 Bcd Input Connector Pin Assignments

    PRS-200 Series P in B C D C ode Fu n c tion D e s c r iption N o. W e ig h t 0 .0 1 -0 .0 9 Ω 0 .1 -0 .9 Ω l-9 Ω 1 0 -9 0 Ω...

  • Page 16: Chapter 5: Ieee Interface Option

    PRS-200 Series Chapter 5 IEEE INTERFACE OPTION 5.1 Introduction Decimal SWITCH Decimal SWITCH Address SETTINGS Address SETTINGS 5-4-3-2-1 5-4-3-2-1 The IEEE interface option makes the PRS-202 a 0-0-0-0-0 1-0-0-0-0 IEEE-488.2-1987 and SCPI 1994.0 compatible instru- 0-0-0-0-1 1-0-0-0-1 ment. 0-0-0-1-0 1-0-0-1-0 0-0-0-1-1 1-0-0-1-1 The IEEE STD 488.2 covers the electrical and me-...

  • Page 17: Chapter 6: Serial Interface Option

    In / Out Chassis The SERIAL option adds RS232C and SCPI 1994.0 Send Data capability to the PRS-202 series instruments. The Receive Data SCPI standard provides a tree like series of standard Request to Send commands for programmable instruments so that simi-...

  • Page 18: Chapter 7: Programming

    PRS-200 Series Chapter 7 PROGRAMMING For example: Introduction Value Command PRS-202 units equipped with IEEE or SERIAL op- 600,567.9 Ω Ω Ω Ω Ω SOURce:DATA 000600567900 tions implement a consistent SCPI interface. A PRS 2,700,000 Ω Ω Ω Ω Ω SOURce:DATA 002700000000 SCPI command reference is included in Appendix A.

  • Page 19: Advanced Programming - Software Drivers

    Open Cicuit / Short Circuit Option: not equipped In our example above, the Manufacturer section con- Open Circuit option present tains “IET Labs”, the Model section contains “PRS- Short Circuit option present 200-F-6-100m-0-0”, the Serial Number section “D6- Both OC/SC present 0211201”...

  • Page 20: Source Impedance

    PRS-200 Series Read the IDN string from the PRS Example 1: iValue=iValue*(1/iMin) Parse the IDN string to extract the IDN String Model iValue=123.51*(1/.1); or iValue = 1235.1 (second) section. Parse this further to determine: iValint=int(iValue); or iValint = 1235 let iType= type of device (R,L,C,RTD; enum 0-3) Example 2: let iModel = model (200,201,202;...

  • Page 21: Chapter 8: Maintenance

    8.1.2 General Considerations have an offset subtraction capability. Steps should be taken to minimize emf effects, by It is important, whenever testing the PRS-202 Series maintaining an even temperature, by using only low Decade units, to be very aware of the capabilities emf connectors.

  • Page 22: Scpi Command Reference

    PRS-200 Series Appendix A SCPI COMMAND REFERENCE SCPI builds on the programming syntax of 488.2 to SCPI is an acronym for “Standard Commands for give the programmer the capability handling a wide Programmable Instruments”. For additional informa- variety of instrument functions in a common manner. tion or an on-line copy of this standard, see: This gives all instruments a common "look and feel".
  • Page 23 PRS-200 Series Notes & Short Keyword Parameter Form Form Commands SYSTem System Address :COMMunicate :GPIB IEEE option only :MODE SINGle | DUAL | SECondary :SERial SERIAL option only :EXTernal 0|1 or OFF|ON [0] :BAUD <numeric value> [9600] :PARity EVEN | ODD | [NONE] :BITS 7 | [8] :SBITs...

  • Page 24: Ieee-488.2 Common Commands

    PRS-200 Series Appendix B IEEE-488.2 COMMON COMMANDS The PRS-202 is compliant with the complete com- such as SRQ and TRG are implemented in the con- mand set defined in the IEEE-488.2 specification. As troller but have no affect on the operation of the in- an output device, the required input related commands strument.

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