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HARS-X SERIES

High-Accuracy Decade

Resistance Substituter

User and Service Manual

♦

PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT

♦

Copyright © 2002 IET Labs, Inc.

HARS im/January, 2002

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

www.ietlabs.com

IET LABS, INC.

in the

GenRad

534 Main Street, Westbury, NY 11590

Standards

•

Decades

•

Strobes

•

Sound Level Meters

•

Bridges

Tradition

1
2
3
...
»

Summary of Contents for HARS-X Series

Page 1: ...PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT Copyright 2002 IET Labs Inc HARSim January 2002 TEL 516 334 5959 800 899 8438 FAX 516 334 5988 www ietlabs com IET LABS INC in the GenRad 534 Main Street...

Page 2: ......

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 I...

Page 4: ...Wire Kelvin Lead Connections 5 3 2 4 Thermal emf Considerations 6 3 3 Dial Setting 6 3 4 Environmental Conditions 6 Chapter 4 MAINTENANCE 7 4 1Verification of Performance 7 4 1 1 Calibration Interval...

Page 5: ...WHENEVER HAZARDOUS VOLTAGES 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 REMOVE POWER WHEN HANDL...

Page 6: ......

Page 7: ...nstruments Contact resistance is stable and remains low and repeatable High qualitygold platedtellurium copperbindingposts serve to minimize the thermal emf effects which would artificially reflect a...

Page 8: ...tance Total Stability Long Term Temperature Max Maximum Maximum per Decade Stability Coefficient Power current voltage Step Resistance ppm year ppm 3 years ppm C W step per decade per step 1 m 10 m 10...

Page 9: ...ircuits or other con figurations Each unit consists of low inductance resistors in series with a high perfor mance solid silver alloy contact switch For less exacting applications more economical tole...

Page 10: ...istance at 23 C traceable to NIST Zero Resistance 1 m per decade typical at dc Power per Step 25 mW for 1 m steps 0 2 W for 10 m steps 0 25 W for 100 m steps 0 6 W for 1 through 100 steps 0 5 W for 1...

Page 11: ...thenecks of the binding posts If the four terminals are avail able separately the optimal connection is shown in Figure 3 1 where the current leads are introduced into the top of the binding posts and...

Page 12: ...position on any one decade equals the 1 position on the next higher decade It adds about 11 to the nominal total decade resistance To determine the resistance obtained when one or more 10 settings are...

Page 13: ...funcertaintyofthein strumentitself Anumberofcommercialbridgesand meters exist that can perform this task consult IET Labs It is important to allow both the testing instrument andtheHARS XSubstituterto...

Page 14: ...8 MAINTENANCE HARS Series Figure 4 1 HARS Series Schematic Diagram...

Page 15: ......

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