IET Labs PRS-370 SERIES Operation Manual Download Page 4

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

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IET LABS, INC.

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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT

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Summary of Contents for PRS-370 SERIES

Page 1: ...NSTRUMENTS FOR TEST AND MEASUREMENT TEL 516 334 5959 800 899 8438 FAX 516 334 5988 www ietlabs com IET LABS INC PRS 370 SERIES Programmable Decade Resistance Substituter IEEE 488 2 Ethernet and USB Operation Manual ...

Page 2: ...TEL 516 334 5959 800 899 8438 FAX 516 334 5988 www ietlabs com IET LABS INC ...

Page 3: ...EASUREMENT TEL 516 334 5959 800 899 8438 FAX 516 334 5988 www ietlabs com IET LABS INC Copyright 2019 IET Labs Inc PRS 370 IM March 2019 PRS 370 SERIES Programmable Decade Resistance Substituter IEEE 488 2 Ethernet and USB Operation Manual ...

Page 4: ...TEL 516 334 5959 800 899 8438 FAX 516 334 5988 www ietlabs com IET LABS INC PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT ...

Page 5: ... 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 6: ...or it is not marked with a measurement category its measurement terminals must not be connected to line voltage mains The PRS 370 is an indoor use product DANGEROUS PROCEDURE WARNINGS Comply with all WARNINGS Procedures throughout in this manual and instructions on the instrument prevent you from potential hazard These instructions contained in the warnings must be followed BEFORE APPLYING POWER V...

Page 7: ... be made by qualified maintenance personnel only DO NOT substitute parts or modify the instrument When working with high voltages post warning signs train personnel and keep unauthorized personnel away Do not apply any voltage or currents to the terminals of the instrument in excess of the maximum limits indicated in the specifications section of this manual To avoid the danger of introducing addi...

Page 8: ...2002 96 EC This product complies with the WEEE Directive 2002 96 EC marking requirements The affixed label indicates that you must not discard this electrical electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE directive Annex 1 this product is classified as a Monitoring and Control instrumentation product Do not dispose of electrical a...

Page 9: ... 9 Cleaning 9 3 2 Connection 9 3 2 1 General Considerations 9 3 2 2 Electrical Considerations 9 3 3 Condensed Operating Instructions 10 3 4 Menu Structure 10 3 4 1 Home Screen 14 3 4 2 Setting a Resistance Value 14 3 4 3 Menu Key 14 3 4 4 Resistance Settings Menu 14 3 4 5 Standard Values Menu 15 3 4 5 1 Set Values 15 3 4 5 2 Standard Value 16 3 4 5 3 Decade Value 16 3 4 5 4 Percent Value 16 3 4 6 ...

Page 10: ...tion 26 5 2 Capabilities 26 5 3 Address Switch and Communications Settings 26 5 4 GPIB Test Keyboard 26 Chapter 6 MAINTENANCE 28 6 1 Verification of Performance 28 6 1 1 Calibration Interval 28 6 1 2 General Considerations 28 6 1 3 Calibration Procedure 28 6 1 4 Adjustment of Internal Resistors 28 6 1 5 Calibration Menu and Process 30 6 1 6 Full Calibration adjustment 30 6 1 6 1 Automated versus M...

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Page 12: ...resistance source with excellent characteristics of stability temperature coefficient and power coefficient These features combined with a low virtually constant zero resistance make for very versatile instruments O p e r a t i o n i s b o t h l o c a l u s i n g convenient touch screen keypad and standard and IEEE 488 2 interfaces The PRS 370 employs very low resistance low thermal emf relays wit...

Page 13: ...tector simulation It allows for higher precision and tight tolerances The PRS 370 is a precision resistance source with excellent characteristics of accuracy stability temperature coefficient and power coefficient It is direct reading without the need to subtract zero resistance The PRS 370 offers the option of true 4 wire Kelvin measurement for calibration applications and 2 wire mode for use in ...

Page 14: ...e pre programmed into memory locations 1 to 4 Adjustment Automatic adjustment procedure utilizing a high pre cision DMM eliminates the requirement for manual trimming of resistors Terminals Front and rear connections each consisting of 4 low emf gold plated tellurium copper 5 way binding posts are used for HI and LO terminal pairs for CUR RENT and SENSE GND binding post is connected to the case to...

Page 15: ...d label indicates that you must not discard this electrical electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE Directive Annex I this product is classed as a Monitoring and Control instrumentation product Effects of Humidity Exposuretohumidity 60 foraperiodsofweeks can cause the resistors to drift some of that is reversible Itisrecomme...

Page 16: ... or 6 digits Stability 50 ppm year Range 0 1 Ω 20 MΩ Thermal emf 15 μV Maximum load 2 A 200 V peak 0 5 W whichever applies first Resistors Precision wire wound and metal foil RTD tables PT 100 and PT 1000 tables for both Fahrenheit and Celsius are programmed into memory locations 4 RTD tables can be entered into memory to allow user selection of temperature and the correct value of resistance will...

Page 17: ...SPECIFICATIONS PRS 370 Series 6 This page left intentionally blank ...

Page 18: ...period of time it should be sealed in plastic and stored in a dry location It should not be subjected to temperature extremes beyond the specifica tions Extended exposure to such temperatures can result in an irreversible change in resistance and require recalibration 3 1 4 Bench and Rack Setup The PRS 370 should be placed on a stable flat work surface A front bail is provide to make viewing easie...

Page 19: ...y replace fuse with the same type and rat ing UL CSA type T 0 8 A 250 V 5 x 20 mm 3 1 7 Environmental Do not operate the instrument in the presence of flammable gasses or fumes The PRS 370 is for indoor use only To ensure that the safety requirements the specifications and the measurement accuracy of the PRS 370 are met you must maintain the environmental temperature to within the speci fied range...

Page 20: ...o 2 Wire See section 3 4 4 for more information The GND terminal on all models is connected to the case and to earth and chassis grounds This may be used as a shield terminal 3 2 2 Electrical Considerations The performance of the PRS 370 is directly affected by the quality of the connection to the system under test This is particularly true with the precision series models having higher accuracy a...

Page 21: ... 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 Press MENU to display Main Menu and press the Back key to return to Home screen Below is the basic menu structure of the PRS 370 ...

Page 22: ... Selection Front or Rear Standard Values RTD and Other Tables Settings Switch Mode Fast or Slow Resistance Settings Main Menu Set Value 0 1 ȍ Standard Value 1 Decade Value 0 1 ȍ Percent Value 0 001 Standard Values Resistance Settings Main Menu Probe Type None PT 100 C PT 100 F PT 1000 C PT 1000 F or Default User Selected RTD Table Settings Resistance Settings Main Menu Table Settings User Selected...

Page 23: ...sistance Settings PRS DMM Settings Instrument Calibration only shown when Cal Enable pressed About PRS DMM Main Menu PRS DMM Off On Accuracy Slow Fast Instrument Settings Resistance Settings Main Menu DMM KS 3458A or FL8508A Address 1 30 Instrument Settings PRS 370 ...

Page 24: ...nter Password Calibration History Instrument Calibration Main Menu Calibration History Calibrated Resistor R1 R43 Main Menu Resistance Settings PRS DMM Settings Instrument Calibration only shown when Cal Enable pressed About About Main Menu IET Labs Inc PRS 370 SN XX XXXXXXXX FW 1 15 HW 1 00 Reset to Default Yes or No Factory Reset Yes or No PRS 370 ...

Page 25: ...temperature if RTD tables are used The main display also shows if the unit is configured for 4 wire mode or 2 wire mode in the upper left corner of the display after Resistance Figure 3 1 Home screen showing 2 Wire See section 3 2 1 for more information on 2 wire and 4 wire connections Pressing MENU will display the main menu Pressing INC or DEC will increment or decrement the resistance value bas...

Page 26: ...hort 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 Standard Values and RTD and Other Tables Settings have separate menus which are described in the sections below 3 4 5 S...

Page 27: ...es Association EIA and common values are E12 E24 E48 and E96 The number after the E denotes the number of resistance values the series contains per decade The series are logarithmic and are derived from the resistor tolerance resistors with a tighter tolerance can have more values in the series that won t overlap one another The series are sometimes referred to by the tolerance the two being relat...

Page 28: ...e plus the resistance value multipled by the Percentage Value 3 4 6 RTD and Other Tables Menu Selecting the RTD and Other Tables menu allows use of tables There are 9 tables that can be selected The first 4 tables are defined as PT 100 C PT 100 F PT 1000 C and PT 1000 F where C is degrees Celsius and F is degrees Fahrenheit Press ENTER when Probe Type is highlighted to change between the various R...

Page 29: ... name of the table can be entered If there are tables which need to be deleted then highlight the table and press DEL Once the table name is entered the table can be selected in User Functions and then a value of Units of Ω F C or K can be entered Use the key to move UP and the to move DOWN between User Functions Units and the Table The table shown in the bottom of Figure 3 7 can then be filled ou...

Page 30: ...0 to control either a Fluke 8508A DMM or Keysight 3458A DMM and automatically adjust the output source resistance based upon measurements from the DMM 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 10 Accuracy When Slow is selected the DMM is configured for 7 5 digits and 6 5 digits in Fast This affects the speed o...

Page 31: ...YES or NO to reset all parameters back to default The only item this reset does not affect is Calibration data 3 5 Thermal emf Considerations The PRS Series uses high quality low emf components Thermalemfisprimarilyattributable to the temperature 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 ...

Page 32: ...y environments Always allow the instrument to stabilize at room temperature after unpacking or relocating the instrument Humidity should be maintained at laboratory conditions and typically 50 RH non condensing to minimize shifts in resistance 3 7 Remote Operation When the PRS is in REMOTE with front panel locked out an REMOTE indication will be shown in bottom half of the HOME screen Pressing the...

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Page 34: ... function in PRS DMM Mode 4 1 2 General Requirements PRS DMM Mode allows the PRS 370 to control a Fluke 8508Aor Keysight 3458ADMM via the IEEE interface A GPIB cable must be connected between the IEEE interface on the PRS 370 and the IEEE interface on the DMM The rear binding post of the PRS 370 should be connected to the front binding post of the DMM using a high quality 4 terminal kelvin connect...

Page 35: ...tion of Slow or Fast accuracy in Figure 4 3 Figure 4 3 Accuracy When Slow is selected the DMM is configured for 7 5 digits and 6 5 digits in Fast This affects the speed or time required to perform adjustments in PRS DMM Mode Up to 5 iterations can be performed to adjust the source output in either accuracy 4 2 3 Configure Instrument Settings Highlighting and pressing ENTER on Instru ment Settings ...

Page 36: ...reen Touching the resistance value brings up the entry screen for resistance or the numeric keypad can be used to enter the required resistance value as shown in Figure 4 7 Figure 4 7 PRS DMM Enter resistance value screen Enter the required resistance value and press one of the unit buttons To initiate an adjustment make sure IEEE and measurement cables are connected between the DMM and the PRS 37...

Page 37: ...rtainties for TCAL 1 C Once fine Adjusting is complete the front connections are switched in and the rear con nections are switched off on the PRS 370 so both the DMM and DUT can be simultaneously connected to the PRS 370 When the source resistance is measured at the front terminals with a DMM 15 minutes lat er the source resistance shows no significant change This allows the PRS 370 to become a 4...

Page 38: ...cols The standard is available on line at http www ieee org The SCPI standard provides a tree like series of standard commands for programmable instruments so that similar instruments by different manufacturers can be controlled by the same program SCPI information and a command reference are located in Appendix A Other tutorials are available on line consult IET for additional information A softw...

Page 39: ...art up and it lets you enter just the data that you want to send to the device 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 ...

Page 40: ...er of hours at the nominal operating temperature of 23o C and at nominal laboratory conditions of humidity There should be no temperature gradients across the unit under test In the case of the PRS 370 a Kelvin type 4 wire test terminals should be used to obtain accurate low resistance readings Steps should be taken to minimize thermal emf effects by maintaining an even temperature and by using on...

Page 41: ...performed to the PRS 370 Below is a list of the 43 resistors and their nominal resistance value These resistors should be within 1 of the nominal value for R1 to R5 and 0 1 of the nominal value for R6 and higher to ensure proper operation of the PRS 370 If the measured value of the resistor is outside of these specifications service is required The Calibration History will show each resistor value...

Page 42: ...n Once this menu is displayed the CAL ENABLE key can be released Figure 6 2 Instrument Calibration Menu Full Calibration allows calibration of 1 or all 43 resistors Calibration of a single resistor is only available in manual mode Trace Calibration is only required if the PRS 370 requires service which involves changing of the relay board or internal wiring between binding post and the relay board...

Page 43: ... Resistance Mode the process is manual If the PRS 370 is configured for PRS DMM Mode prior to going into the calibration routine for the measurement of all 43 resistors is done automatically with the PRS 370 controlling the DMM The PRS 370 should be configured as outlined in Chapter 4 This is a completely automated process If the PRS 370 is configured for source resistance mode the technician will...

Page 44: ...his information can be used to look at the drift of each of the 43 internal resistors This data can be viewed in this menu If exporting this data is required see Appendix B remote commands which allow this data to be transferred to a PC Figure 6 6 Calibration History Screen From the Instrument Calibration menu select Calibration History and press ENTER The menu in Figure 6 6 will be shown Each tim...

Page 45: ...370 Relay Board Relay Board Complete Not Shown PRS 370 CPU Board CPU Board Complete Not Shown PRS 370 Remote Interface USB IEEE Ethernet Interface Card 4 PRS 370 Touch Screen Touch Screen Not Shown PRS 370 BP Board Front Binding Post Board Front Not Shown PRS 370 BP Board Rear Binding Post Board Rear 5 PRS 370 FP Front Panel with Overlay and Bezel 6 PRS 370 Keypad Keypad and Keypad board 7 PRS 370...

Page 46: ...here a reply is expected SCPI builds on the programming syntax of IEEE 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 denotes the abbreviated form of the keyword Either the abbreviated or whole keyword ma...

Page 47: ...le register SRE Returns the read of the service request enable register ESE Set the event status enable register value SRE Set the service request enable register value RST Reset the buffer TST Self test query CLS Clear standard event status register OPC Operation complete OPC Operation complete query WAIT Wait until operation is complete before execut ing next command No Function in PRS PCS Power...

Page 48: ...er is 0 to 9 RCL number Recalls resistance value from memory location 0 to 9 Number is 0 to 9 SYSTEM Commands SYSTem SERIal Ax xxxxxxxx Sets the serial number in non volatile memory serial num ber Serial number in the form Ax xxxxxxxx x 0 to 9 A Alpha can be A to Z SYSTem SERIal Returns Serial number SYSTem CONTrast number Sets system contrast specific number from 0 to 15 SYSTem KEY number Same as...

Page 49: ... time the command CALI RES SET is used the resistor number is automatically incremented by 1 CALIbrate RESistance Returns resistance number to be calibrated Numbers 1 to 43 CALIbrate RESistance SET number Sets calibrated value of resistance in ohms into mem ory number is a floating point number representing the resistance value in ohms for the internal resistor being measured Each time the command...

Page 50: ...display value currently shown in the PRS display SOURce RESistance 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 is in the form of number and decimal point representing desired display value This is the same as SOURce DATA command example SOURce RES 0 would set display valu...

Page 51: ...OPEN SHORT CONFIGURE DMM Mode PRS 370 Only CONFigure PRSDMM ACCUracy SLOW FAST Sets resolution of DMM 7 or 6 respectively CONFigure PRSDMM ACCUracy Returns SLOW FAST CONFigure PRSDMM METEr 8508A 3458A Sets which DMM is used CONFigure PRSDMM METEr Returns string corresponding to selected DMM 8508A 3458A CONFigure PRSDMM ADDRess 1 30 corresponding to IEEE address 1 to 30 of DMM CONFigure PRSDMM ADDR...

Page 52: ... 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 0 1 10M CONFigure STDValue DECade Returns number 0 1 10M CONFigure STDValue RADiometric number 0 001 10 where number is in CONFigure STDValue RADiometric Returns number 0 001 10 ...

Page 53: ...ns the number 1 to 4 of currently selected table CONFigure TABLe ERASE Erases all rows in the table CONFigure TABLe ADD user_value resistance_value Adds a row to the end of table show ing user value and resistance value in ohms example CONF TABL ADD 20 95 means that if the table is selected and the operator enters 20 from the front panel the output will be set to 90 Ω CONFigure TABLe ADD Returns t...

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