IET Labs, Inc. HPRS-F-3-0.01 User And Service Manual Download Page 17 | Manualshive

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MAINTENANCE

HPRS Series

Figure 5.1. HPRS Series Schematic Diagram

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Summary of Contents for HPRS-F-3-0.01

Page 1: ...TEST AND MEASUREMENT Email info ietlabs com TEL 516 334 5959 FAX 516 334 5988 www ietlabs com IET LABS INC Copyright 2018 IET Labs Inc HPRS im Jan 2018 HPRS SERIES High Power Decade Resistance Substituter User and Service Manual ...

Page 2: ...Email info ietlabs com TEL 516 334 5959 FAX 516 334 5988 www ietlabs com IET LABS INC ...

Page 3: ...eplaced 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 ...

Page 4: ...4 HRRS Series Revision History Date Description By March 2013 Initial release LB Jan 2 Major update for standardization of marking and required information in the manual BB ...

Page 5: ... Category I or it is not marked with a measurement category its measurement terminals must not be connected to line voltage mains and it is not designed for use as for measurements within measurement categories II III and IV The HPRS Series are an indoor use product DANGEROUS PROCEDURE WARNINGS Comply with all WARNINGS Procedures throughout in this manual prevent you from potential hazard These in...

Page 6: ...nent replacement and internal adjustments must be made by qualified maintenance personnel only DO NOT substitute parts or modify the instrument There are no user serviceable parts inside Refer servicing to qualified personnel Only replaced fuses with correct size and rating to prevent electrical shock To avoid the danger of introducing additional hazards do not install substitute parts or perform ...

Page 7: ... 45 V 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...

Page 8: ...ctrical Considerations 13 4 4 Dial Setting 13 4 5 Environmental Conditions 13 Chapter 5 MAINTENANCE 14 5 1 Preventive Maintenance 14 5 2Verification of Performance 14 5 2 1 Calibration Interval 14 5 2 2 General Considerations 14 5 2 3 Procedure 14 5 3 Schematic and Replacement Parts 15 5 4 Troubleshooting 15 5 5 Disassembly Component Replacement and Reassembly 15 5 5 1 Disassembly 15 5 5 2 Compone...

Page 9: ...tion of meters and instru ments HPRS instruments are useful development tools wherever precise resistances with high power handling capacity are required It is important to keep the amount of time power is applied the the HPRS within the duty cycles below The duty cycles assume an ambient temperature of around 230 C Power Time on Time off 101 W continuous none 101 W 5 minutes 10 minutes Exceeding ...

Page 10: ...01 HPRS F 7 0 1 999 999 9 k 7 0 1 HPRS F 7 1 9 999 999 M 7 1 HPRS F 0 001 99 999 999 k 8 0 001 HPRS F 8 0 01 999 999 99 k 8 0 01 HPRS F 8 0 1 HPRS 200W 9 999 999 9 M 8 0 1 For 0 5 accuracy substitute C for F in part number Options RM for rack mountable version For programmable versions see PRS 300 and PRS 200 202 Accuracy after subtraction of zero resistance at 23 C traceable to SI Option F 1 20 m...

Page 11: ...zero resistance Zero Resistance 5 mΩ per decade Terminals Two five way binding posts and one ground post electrically connected to case HPRS SERIES HIGH POWER DECADE RESISTANCE SUBSTITUTER WARNING Observe all safety rules when working with high voltages or line voltages Connect the G terminal to earth ground in order to maintain the case at a safe voltage Whenever hazardous voltages 45 V are used ...

Page 12: ...hipping of the instrument should become necessary 3 2 Installation For a rack mounted model installation in a 19 inch rack may be made using the slots in the rack mounting ears A mounting location that does not expose the unit to excessive heat is recommended For bench models no installation as such is required because this instrument series is not powered Since it is a high accuracy instrument be...

Page 13: ...0 C Power Time on Time off 101 W continuous none 101 W 5 minutes 10 minutes Exceeding the time on can cause damage to the resis tors If continuous use is required to full rated power see DRS 900 High Power Resistance Substituter 4 3 Electrical Considerations As a good safety practice the case should be grounded using the G terminal Since high voltages may be present it is important to observe all ...

Page 14: ...apabilities and limitations of the test instruments used There are a some bridges and direct reading resistance me ters or digital multimeters available that can verify the accuracy of these units especially when used in conjunction with standards that can serve to confirm or improve the accuracy of the testing instrument Such instruments would have to be significantly more accurate than the speci...

Page 15: ...move a decade switch assembly proceed as follows 1 Label and unsolder the bus wires connecting the switch assembly to the resistive loads 2 Loosen the screw holding the knob on the switch shaft and remove the knob 3 Remove the nut holding the switch assembly on the front panel and remove the assembly 4 Replace the assembly by reversing the above steps making certain that the knob screw is aligned ...

Page 16: ...arranty will be repaired at no charge For any questions on repair costs or shipment instruc tions please contact our Service Department at the above number or visit www ietlabs com to request an RMA online To safeguard an instrument during shipment please use packaging that is adequate to protect it from damage i e equivalent to the original packaging and mark the box Delicate Electronic Instrumen...

Page 17: ...17 MAINTENANCE HPRS Series Figure 5 1 HPRS Series Schematic Diagram ...

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