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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT

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Email: [email protected]

TEL: (516) 334-5959 • FAX: (516) 334-5988

www.ietlabs.com

IET LABS, INC.

HARS-X and X2

High Accuracy Resistance

Substituter

User and Service Manual

Copyright © 2018 IET Labs, Inc.

Visit www.ietlabs.com for manual revision updates

HARS-X im/October 2018

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Содержание HARS-X

Страница 1: ...info ietlabs com TEL 516 334 5959 FAX 516 334 5988 www ietlabs com IET LABS INC HARS X and X2 High Accuracy Resistance Substituter User and Service Manual Copyright 2018 IET Labs Inc Visit www ietlabs com for manual revision updates HARS X im October 2018 ...

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

Страница 3: ... 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 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 EXPRESS...

Страница 4: ...ES 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 ...

Страница 5: ...ction and Setup 5 3 2 Connection 5 3 2 1 General Considerations 5 3 2 3 Four 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 4 1 Verification of Performance 7 4 1 1 Calibration Interval 7 4 1 2 General Considerations 7 4 1 3 Calibration Procedure 7 4 2 Schematic 8 4 3 Replaceable Parts List 9 ...

Страница 6: ...uracy Resistance Substituter 1 Figure 1 2 Single Decade HARS Unit 1 Figure 2 1 Typical Operating Guide Affixed to Unit 4 Figure 3 1 Optimal 4 Wire Kelvin Lead Connection 6 Figure 4 1 HARS Series Schematic Diagram 8 Table 4 2 Replacement List 9 Figure 4 2 HARS X Replaceable Parts 9 ...

Страница 7: ...epeatable High quality gold plated tellurium copper binding posts serve to minimize the thermal emf effects which would artificially reflect a change in dc resistance measurements All other conductors within the in strument as well as the solder employed contain no metals or junctions that could contribute to thermal emf problems The standard models offer a choice of one through eleven decades The...

Страница 8: ...ections on the rear of the instrument are available RO option K Option Kelvin connection is available as an option with 5 binding posts Resistance per step Total decade resistance Stability ppm yr Long term stability ppm 3 yrs Temperature coefficient ppm C Resistor type HARS X HARS X2 Max current Max voltage per step Max power per step Max current Max voltage per step Max power per step 1 mΩ 10 mΩ...

Страница 9: ... 1 M HARS X 3 0 001 1 11 3 0 001 HARS X 3 0 01 11 1 3 0 01 HARS X 3 0 1 111 3 0 1 HARS X 3 1 1 11 k 3 1 HARS X 3 10 11 1 k 3 10 HARS X 3 100 111 k 3 100 HARS X 3 1K 1 11 M 3 1 k HARS X 3 10K 11 1 M 3 10 k HARS X 3 100K 111 M 3 100 k Model Total resistance Ω No of Dials Resolution Ω HARS X 4 0 001 11 11 4 0 001 HARS X 4 0 01 111 1 4 0 01 HARS X 4 0 1 1 111 k 4 0 1 HARS X 4 1 11 11 k 4 1 HARS X 4 10...

Страница 10: ...der to maintain the case at a safe voltage Whenever hazardous voltages 45 V are used take all measures to avoid accidental contact with any live components a Use maximum insulation and minimize the use of bare conductors b Remove power when adjusting switches c Post warning signs and keep personnel safely away IET LABS INC 534 Main Street Westbury NY 11590 800 899 8438 516 334 5959 Fax 516 334 598...

Страница 11: ...imal connection is shown in Figure 3 1 where the current leads are introduced into the top of the binding posts and the voltage leads at the necks 3 1 Initial Inspection and Setup This instrument was carefully inspected before ship ment It should be in proper electrical and mechanical order upon receipt An OPERATING GUIDE is attached to the case of the instrument to provide ready reference to spec...

Страница 12: ...ibility and range each decade provides a 10 position setting This 10 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 used simply add 1 to the next higher decade For example a setting of 3 6 10 0 10 Ω becomes 3 3 0 0 0 0 6 6 0 0 0 10 1 0 0 0 0 0 0 ...

Страница 13: ...nges allowing for a band of uncertainty of the instrument itself A number of commercial bridges and meters exist that can perform this task consult IET Labs It is important to allow both the testing instrument and the HARS Substituter to stabilize for a number of hours at the nominal operating temperature of 23O C and at nominal laboratory conditions of humidity There should be no temperature grad...

Страница 14: ...8 HARS X and X2 8 Maintenance Figure 4 1 HARS Series Schematic Diagram 4 2 Schematic Refer to Figure 4 1 for a schematic of the HARS decade unit ...

Страница 15: ...p Decade Switch Assembly Not Shown HARS 4100 X 1 1 Ω step Decade Switch Assembly Not Shown HARS 4100 X 10 10 Ω step Decade Switch Assembly Not Shown HARS 4100 X 100 100 Ω step Decade Switch Assembly Not Shown HARS 4100 X 1k 1 kΩ step Decade Switch Assembly Not Shown HARS 4100 X 10k 10 kΩ step Decade Switch Assembly Not Shown HARS 4100 X 100k 100 kΩ step Decade Switch Assembly Not Shown HARS 4100 X...

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