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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
HARS-LX SeRieS
Laboratory Standard Decade
Resistance Substituter
User and Service Manual
Copyright © 2009 IET Labs, Inc.
Visit www.ietlabs.com for manual revision updates
HARS-LX im/April 2009
IET LABS, INC.
www.ietlabs.com
534 Main Street, Westbury, NY 11590
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
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Summary of Contents for IET Labs HARS-LX Series
- Page 1 PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT HARS-LX SeRieS Laboratory Standard Decade Resistance Substituter User and Service Manual Copyright © 2009 IET Labs, Inc. Visit www.ietlabs.com for manual revision updates HARS-LX im/April 2009 IET LABS, INC. www.ietlabs.com 534 Main Street, Westbury, NY 11590...
- Page 2 ♦ ♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT IET LABS, INC. www.ietlabs.com 534 Main Street, Westbury, NY 11590 TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988...
- Page 3 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. Changes in this product not approved by IET or application of voltages or currents greater than those allowed by the specifi ...
- Page 4 WARninG OBSERVE ALL SAFETY RULES WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES. Dangerous voltages may be present inside this instrument. Do not open the case Refer servicing to qulifi ed personnel HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT WHENEVER HAZARDOUS VOLTAGES (>...
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Page 5: Table Of Contents
Contents Chapter 1 Introduction .................1 Chapter 2 Specifications ................2 Model Information ......................3 Chapter 3 Installation ...................5 3.1 Initial Inspection ....................5 3.2 Installation ......................5 3.3 Repackaging for Shipment ..................5 3.4 Storage ........................5 Chapter 4 Operation ..................6 4.1 Initial Inspection and Setup .................. - Page 6 Figures and Tables Figure 1-1: HARS-LX Standard Decade Resistance Substituter ....1 Figure 2-1: Typical Operating Guide Affixed to Unit ........4 Figure 4-1: Kelvin Bridge Connections ............8 Table 5-1: Trimming Potentiometers ............12 Figure 5-1: Typical Trimmer Board ...............12 Table 5-2: Replaceable Parts List ..............13 Figure 5-2: HARS-LX Replaceable Parts ............13...
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Page 7: Chapter 1 Introduction
The HARS-LX series employs completely enclosed dust-tight very low contact resistance switches. They feature solid silver alloy contacts and quadruple- Figure 1-1:... -
Page 8: Chapter 2 Specifications
HARS-LX Series Chapter 2 SpeCifiCAtionS Resistance Power Coefficient: For convenience to the user, the pertinent specifica- tions are given in a typical OPERATING GUIDE, <±1 ppm/mW for 0.1 Ω steps and under; like the one shown in Figure 2.1, affixed to the case <±0.4 ppm/mW for 1 Ω steps; of the instrument. <±0.3 ppm/mW for 10 Ω steps;... -
Page 9: Model Information
HARS-LX Series MoDeL infoRMAtion Model Resolution total Model Resistance (Ω) Decades (Ω) HARS-LX-4-0.001 11.11 0.001 HARS-LX-1-0.001 0.01 0.001 HARS-LX-4-0.01 111.1 0.01 HARS-LX-1-0.01 0.01 HARS-LX-4-0.1 1.111 k HARS-LX-1-0.1 HARS-LX-4-1 11.11 k HARS-LX-1-1 HARS-LX-4-10 111.1 k HARS-LX-1-10 HARS-LX-4-100 1.111 M HARS-LX-1-100 HARS-LX-4-1K 11.11 M... -
Page 10: Figure 2-1: Typical Operating Guide Affixed To Unit
HARS-LX Series Figure 2-1: Typical Operating Guide Affixed to Unit Specifications... -
Page 11: Chapter 3 Installation
Repackaging for Shipment IET instruments receive a careful mechanical and If the instrument is to be returned to IET Labs, contact electrical inspection before shipment. Upon receipt, the Service Department at the number or address, verify that the contents are intact and as ordered. -
Page 12: Chapter 4 Operation
CRNT HI, CRNT LO, SENSE HI, and SENSE The highest quality low emf components are used in LO provide two current and two potential terminals, the HARS-LX Series. In particular, the terminals are respectively, for 4-terminal measurement. 2-terminal made of gold plated tellurium copper, which exhibits measurements may be made by shorting CRNT HI to low emf and low resistance. -
Page 13: Dial Setting
HARS-LX Series Dial Setting power Considerations The resistance setting may be read directly from the To maintain the maximum possible accuracy and pre- dial settings whenever the dials are in positions 0-9. cision, power applied to the HARS-LX should be kept as low as possible, preferably below 0.1 W. -
Page 14: Meter Shunt Applications
HARS-LX Series Meter Shunt Applications For maximum protection and accuracy, limit power input to HARS-LX to 1Watt. This may be accom- plished by placing a resistor in series with the bridge To measure the current in a 4-terminal resistor: generator or battery. -
Page 15: Chapter 5 Maintenance
If it is maintained in a clean or air- 5.3.1 Calibration interval conditioned environment, cleaning will seldom be required. The recommended HARS-LX Series calibration interval is twelve (12) months. Should cleaning be needed: If the instrument is used to transfer resistance values only, recalibration is not required, assuming that there ... -
Page 16: General Considerations
5.3.3 Required equipment the confidence band. For the HARS-LX series, the limits for Many combinations of standards, transfer stan- any resistance “R” are: dards, meters, and bridges may be used to calibrate [R±(20 x 10 R + 0.0005Ω)]. -
Page 17: Adjustments
HARS-LX to a resis- tance meter. If the minimum 10 mΩ needs to be adjusted, consult Rotate all knobs approximately 10 times. IET Labs. For other resistors, adjust the resistors Breaking in the switches helps elimi- from lowest to highest. The order of decades does nate any residual contact corrosion not matter. -
Page 18: Figure 5-1: Typical Trimmer Board
HARS-LX Series Switch position potentiometer Designation* T0 or T1 T1 or T2 T2 or T3 T3 or T4 T4 or T5 T5 or T6 T6 or T7 T7 or T8 T8 or T9 T9 or T10 T10 or T11 (100 k steps only) -
Page 19: Replaceable Parts List
HARS-LX Series Replaceable parts List Model Ref IET Pt No Description 01-1033-8-0312 Binding Post, Red 01-1033-8-0310 Binding Post, Black 01-1008-1-0310 Binding Post, Gold HARS-LX-4300-KNB Knob Assembly Not Shown HARS-LX-3100 Foot Not Shown HARS-4000-LX-.001 1 mΩ/step Decade Switch Assembly Not Shown HARS-4000-LX-0.01 10 mΩ/step Decade Switch Assembly Not Shown HARS-4000-LX-0.1...