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IET Labs PRS-370 SERIES Operation Manual

Programmable decade resistance substituter (ieee-488.2, ethernet and usb)
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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
PRS-370 SERIES
Programmable
Decade Resistance Substituter
(IEEE-488.2, Ethernet and USB)
Operation Manual
IET LABS, INC.
www.ietlabs.com
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988

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  • Page 1 ♦ ♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT PRS-370 SERIES Programmable Decade Resistance Substituter (IEEE-488.2, Ethernet and USB) Operation Manual IET LABS, INC. www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988...
  • Page 2 IET LABS, INC. www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988...
  • Page 3 PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT PRS-370 SERIES Programmable Decade Resistance Substituter (IEEE-488.2, Ethernet and USB) Operation Manual Copyright © 2019 IET Labs, Inc. PRS-370 IM / March. 2019 IET LABS, INC. www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988...
  • Page 4 ♦ ♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT IET LABS, INC. www.ietlabs.com TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988...
  • Page 5 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 specifi cations. 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.
  • Page 6 IET Labs assumes no liability for the customer’s failure to comply with these precautions. The PRS-370 complies with INSTALLATION CATEGORY I as well as POLLUTION DEGREE 2 in IEC61010-1.

  • Page 7: Caution

    To avoid the danger of introducing additional hazards, do not install substitute parts or perform unauthorized modifi cations to the instrument. Return the instrument to an IET Labs for service and repair to ensure that safety features are maintained in operational condition.
  • Page 8 Safety Symbols General defi nitions of safety symbols used on the instrument or in manuals are listed below. Caution symbol: the product is marked with this symbol when it is necessary for the user to refer to the instruction manual. Hazardous voltage symbol: the product is marked with this symbol when high voltage maybe present on the product and an electrical shock hazard can exist.

  • Page 9: Table Of Contents

    PRS-370 Series CONTENTS WARRANTY ......................i WARNING ......................ii CAUTION ......................ii CONTENTS ......................iii Chapter 1: INTRODUCTION ................1 Chapter 2: SPECIFICATIONS ................3 2.1 Specifi cations .........................3 2.2 General Specifi cations and Stability ................4 2.2 Typical Label ........................5 Chapter 3: OPERATION ..................
  • Page 10 PRS-370 Series 3.7 Remote Operation ....................20 Chapter 4: PRS-DMM Mode ................22 4.1 PRS-DMM Mode ......................22 4.1.1 Overview ......................22 4.1.2 General Requirements ..................22 4.2 Confi guration .......................23 4.2.1 Confi gure PRS-DMM Mode On ................23 4.2.2 Confi gure Accuracy ....................23 4.2.1 Confi gure Instrument Settings ................23 4.3 Performing an Adjustment ...................24...
  • Page 11 PRS-370 Series This page left intentionally blank Table of Contents...

  • Page 12: Chapter 1: Introduction

    PRS-370 Series Chapter 1 INTRODUCTION T h e P R S - 3 7 0 ( F i g u r e 1 . 1 ) i s a h i g h s t a n d a r d a n d I E E E - 4 8 8 . 2 i n t e r f a c e s .
  • Page 13 PRS-370 Series applications 2-wire mode accuracy, good stability, and low zero resistance. in series as a substitute resistor and for RTD applications. The front panel display The PRS-370 is suited for automatic and indicates the mode selected: 2-wire or 4-wire.

  • Page 14: Chapter 2: Specifications

    PRS-370 Series Chapter 2 SPECIFICATIONS For convenience to the user, the pertinent Terminals: specifi cations are given in an OPERATING Front and rear connections each consisting of 4 low-emf, gold-plated, tellurium-cop per 5-way bind ing GUIDE, shown typically in Figure 2.1, affi xed posts are used for HI and LO ter mi nal pairs for CUR- to the case of the instrument.

  • Page 15: General Specifi Cations And Stability

    PRS-370 Series Short-term Stability: 2.2 General Specifi cations and Stability The PRS-370 was tested for extended periods of time. Based upon this testing the following Warm-up: stability information was determined. These This unit utilizes custom designed low thermal specifications apply for the PRS-370 in 4...
  • Page 16 PRS-370 Series PRS-370 PROGRAMMABLE DECADE RESISTANCE SUBSTITUTER CONSULT INSTRUCTION MANUAL FOR PROPER INSTRUMENT OPERATION Accuracy: ±(70ppm + 1 mΩ) 2 and 4 Terminal at 23°C ±5°C Terminals: Minimum setting: 0.100 000 Ω Four low-emf, gold-plated, tellurium-cop per 5-way bind ing posts are used for HI and LO ter mi nal pairs for CUR RENT and SENSE.
  • Page 17 PRS-370 Series This page left intentionally blank SPECIFICATIONS...

  • Page 18: Chapter 3: Operation

    PRS-370 Series Chapter 3 OPERATION Mount the unit in a standard 19” rack if the rack 3.1 Initial inspection and setup mount option is specifi ed. This instrument was tested and carefully 3.1.5 Front and Rear Panel inspected before shipment. It should be in proper electrical and mechanical order upon receipt.

  • Page 19: Power Connections

    PRS-370 Series The rear panel has an IEC inlet module for con- Power requirements: nection to mains power, GPIB interface and rear 90 - 264 Vac , 47 - 63 Hz., 30 W. Max. binding posts. Fuse Only replace fuse with the same type and rat- ing.

  • Page 20: Cleaning

    PRS-370 Series guide. binding posts of the PRS-370 when set to 2 Wire. See section 3.4.4 for more information There are no user serviceable parts inside the PRS-370. Servicing should be referred to qual- The GND terminal on all models is connected to ifi...

  • Page 21: Menu Structure

    PRS-370 Series 3.4 Menu Structure The tables on the next few pages shows the menu structure of the PRS-370. Menu items with a “:” allow selection of a value or feature when ENTER pressed. Menu items without “:” have a submenu with more than 1 item.
  • Page 22 PRS-370 Series PRS-370 Main Menu Resistance Settings PRS-DMM Settings Instrument Calibration (only shown when Cal Enable pressed) About Main Resistance Menu Settings Connection Mode: 4-Wire or 2 Wire Terminal Selection: Front or Rear Standard Values RTD and Other Tables Settings...
  • Page 23 PRS-370 Series PRS-370 Main Menu Resistance Settings PRS-DMM Settings Instrument Calibration (only shown when Cal Enable pressed) About Main PRS-DMM Menu PRS-DMM: <Off, On> Accuracy: <Slow, Fast> Instrument Settings Main Resistance Instrument Menu Settings Settings DMM: <KS 3458A or FL8508A>...
  • Page 24 PRS-370 Series Main Instrument Menu Calibration Full Calibration <Enter Password> Trace Calibration <Enter Password> Calibration History Main Instrument Calibration Menu Calibration History Calibrated Resistor: <R1 – R43> Main Menu>Calibration PRS-370 Main Menu Resistance Settings PRS-DMM Settings Instrument Calibration (only shown when Cal Enable pressed)

  • Page 25: Home Screen

    PRS-370 Series 3.4.1 Home Screen of the value via the touch screen. During entry you can use softkeys to select Ω, kΩ or MΩ. The home screen shows the resistance value in ohms or temperature if RTD tables are used.

  • Page 26: Standard Values Menu

    PRS-370 Series Switch Mode: Allows selection of Default, Open or Short modes. When the resistance or temperature value is changed via the front panel or when a SOURCE:DATA command is sent via the remote interfaces, the intermediate value between previous value and the new value will either be a SHORT, OPEN or undetermined in default switching case.

  • Page 27: Standard Value

    PRS-370 Series 370 pressing the INC and DEC softkeys will When a Standard Value: is selected on the increment the resistance value to the next PRS-370 pressing the INC and DEC softkeys resistance value plus or minus the Set Value.

  • Page 28: Decade Value

    PRS-370 Series 3.4.5.3 Decade Value to change between the various RTD tables. Select None for no RTD table and resistance in The Decade Value: selection allows the resistance Ωs will be displayed. value to increment by a decade value in Ωs each time the INC and DEC key is pressed.

  • Page 29: User Select Rtd Menu

    PRS-370 Series Once the table is selected the home screen will change for example to temperature on the display see Figure 3-6. Figure 3-8 Select Table Name Pressing ADD key opens an entry screen so that a name of the table can be entered.
  • Page 30 PRS-370 Series 3.4.7.2 Accuracy Highlighting and pressing ENTER on Accuracy will allow selection of Slow or Fast accuracy in Figure 3-10. Figure 3-8 PRS-DMM Settings There are three selections PRS-DMM Mode, Accuracy and Instrument Settings. Highlight PRS-DMM Mode or Accuracy and press ENTER to change these settings.

  • Page 31: About Menu

    PRS-370 Series between DMM and Address. Highlighting DMM and pressing ENTER will show the menu in Figure 3-12. Figure 3-9 About Menu The only item that can be highlighted and Figure 3-12 DMM changed is Reset to Defaults. Pressing ENTER...

  • Page 32: Environmental Conditions

    PRS-370 Series 3.6 Environmental Conditions The PRS is built, calibrated and intended for use in a laboratory environment with a nominal ambient temperature near 23 C. The accuracy of the unit may be affected when operated in non-laboratory environments. Always allow the instrument to stabilize at room temperature after unpacking or relocating the instrument.
  • Page 33 PRS-370 Series This page left intentionally blank OPERATION...

  • Page 34: Chapter 4: Prs-Dmm Mode

    PRS-370 Series Chapter 4 PRS-DMM Mode 4.1.2 General Requirements 4.1 PRS-DMM Mode PRS-DMM Mode allows the PRS-370 to control a Fluke 8508A or Keysight 3458A DMM via the 4.1.1 Overview IEEE interface. When PRS-DMM mode is turned on this allows...

  • Page 35: Confi Guration

    PRS-370 Series 4.2 Confi guration performed to adjust the source output in either accuracy. Press MENU button and highlight PRS-DMM Settings and press ENTER key to access PRS- 4.2.3 Confi gure Instrument Settings DMM settings. Highlighting and pressing ENTER on Instru- 4.2.1 Confi...

  • Page 36: Performing An Adjustment

    PRS-370 Series shown in Figure 4-7. Figure 4-5 Address Figure 4-7 PRS-DMM Enter resistance value Use the key to move UP and the to select the screen GPIB address that the Fluke 8508A or Keysight 3458A DMM is set to and then press ENTER.
  • Page 37 PRS-370 Series Figure 4-9 PRS-DMM Mode Once the fi ne “Adjusting” has completed; • Deviation from nominal • Measured value from the DMM • Uncertainty of the DMM Absolute uncertainty is based upon catalog specifi cations given in the instruction manuals for the Keysight 3458A or Fluke 8508A based upon 1 year absolute uncertainties for TCAL ±...

  • Page 38: Chapter 5: Ieee Interface

    PRS-370 Series Chapter 5 IEEE INTERFACE reference are located in Appendix A. 5.1 Introduction Other tutorials are available on-line; consult IET The PRS-370 is a IEEE-488.2-1987 and SCPI for additional information. A software GPIB 1994.0 compatible instrument. “keyboard” can be found at www.ietlabs.com The IEEE interface can be programmed via any of the commands listed in Appendix A and B.
  • Page 39 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. IEEE INTERFACE OPTION...

  • Page 40: Chapter 6: Maintenance

    Proper metrology practices should be followed by the user, if a calibration capability is available, in performing this verifi cation. by IET Labs, or by a certified calibration laboratory. If the user should choose to perform NOTE: The mode in the PRS-370 affects how this procedure, then the considerations below calibration is performed.
  • Page 41 PRS-370 Series The PRS-370 consists 43 internal resistors which are combined in either series or parallel Resistance Nominal Resistance to achieve the programmed resistance. Number Value 0.17 Ω These resistors require periodic measurement to 0.35 Ω keep the PRS-370 within published specifi cations.

  • Page 42: Calibration Menu And Process

    PRS-370 Series ENTER. The menu in Figure 8-2 will be shown. 72.2 kΩ Once this menu is displayed the CAL. ENABLE 147.0 kΩ key can be released. 300.0 kΩ 600.0 kΩ 1.23 MΩ 2.48 MΩ 5.0 MΩ 10.0 MΩ During the adjustment process the fi rmware...
  • Page 43 DMM using a 4 terminal Kelvin connection, making sure the shorting links are not on the binding post. IET Labs uses the Fluke 8508A, set to 7 ½ digits of resolution, during the adjustment process to ensure the PRS-370 meets specifi cations.

  • Page 44: Calibration History

    PRS-370 Series any calibration data taken and the previous DOWN which will show the resistors R1 to R43 calibration data is used. and the calibration history of each resistor. Pressing the EXIT key will save the current Press CNCL to return to the previous Instrument calibration data into memory.

  • Page 45: Replaceable Parts List

    PRS-370 Series 6.2 Replaceable Parts List Model Ref IET Pt No Description BP-1000-RD Binding Post, Red BP-1000-BK Binding Post, Black BP-1000-GN Binding Post, Green Not Shown PRS-370-Bail-Feet kit 4 x feet and bale kit Not Shown PRS-370 Relay Board Relay Board Complete...

  • Page 46: Appendix A: Scpi Command Reference

    PRS-370 Series Appendix A SCPI COMMAND REFERENCE SCPI is an acronym for “Standard Commands for in a common manner. This gives all instruments Programmable Instruments”. For additional in- a common “look and feel”. SCPI commands are formation or an on-line copy of this standard, see: not case-sensitive.
  • Page 47 PRS-370 Series IEEE-488.2 Common Commands *SRE Set the service request enable register value *RST *IDN? Reset the buffer Returns instrument identifi cation “IET *TST? Labs,PRS-370,<Serial Number>,<software Self test query version>” *CLS *ESR? Clear standard event status register Returns the read of the event status register.
  • Page 48 Appendix B PRS-370 COMMON COMMANDS COMMON Commands: *IDN? Returns instrument identifi cation “IET Labs Inc.,PRS-370,<Serial number>,<software version>” Serial number in the form “Ax-xxxxxxxx” x = 0 to 9. A = Alpha can be A to Z. *TST? Self-Test Returns ASCII 0 or 1, 0 = bad or 1 = good *RST Returns PRS-370 to default “power on”...
  • Page 49 PRS-370 Series SYSTem:LOCal: This command places device in the LOCAL mode and unlocks all keys on front panel of the device. The Command is valid only for RS232, and USB interfaces. SYSTem:REMote This command places device in the REMOTE mode and locks all keys.
  • Page 50 PRS-370 Series SOURCE Commands SOURce:DATA <display value> Sets output resistance of the PRS-370 if table is set to None or the resistance value corresponding to the display value for the table selected. Display value in form of number and decimal point representing desired display value.
  • Page 51 PRS-370 Series CONFIGURE Commands General CONFigure:SELect <2 or 4> Sets PRS-370 for 2 wire or 4 wire mode. CONFigure:SELect ? Returns number corresponding to 2 wire or 4 wire mode. 2 = 2 wire and 4 = 4 wire CONFigure:TERMinal <FRONT, REAR> Selects front or rear binding posts...
  • Page 52 PRS-370 Series CONFIGURE Standard Values CONFigure:STDValue <SET, STANard, DECade, RADiometric> CONFigure:STDValue? Returns SET, STANard, DECade, RADiometric CONFigure:STDValue:SET <number> 0.1 - 10M CONFigure:STDValue:SET? Returns <number> 0.1 - 10M CONFigure:STDValue:STD <1, 5, 10> EIA resistor % CONFigure:STDValue:STD? Returns 1, 5, or 10 corresponding to EIA Resistor % CONFigure:STDValue:DECade <number>...
  • Page 53 PRS-370 Series CONFIGURE Tables CONFigure:RTD <P100C, P100F, P1000C,P1000F> CONFigure:RTD? Returns which RTD table is selected P100C, P100F, P1000C, or P1000F CONFigure:TABLe:SELect <number> Selects Table to be used, <number> is 0 to 9. 0 is no table with display shown in ohms and 1 , 2, 3 and 4 are predefi ned and 5 to 9 are user defi ned tables CONFigure:TABLe:SELect? Returns table number that is selected CONFigure:TABLe:NAME <name>...
  • Page 54 PRS-370 Series This page left intentionally blank APPENDIX B...

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