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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
HARS-X SERIES
High-Accuracy Decade
Resistance Substituter
User and Service Manual
Copyright © 2002 IET Labs, Inc.
HARS im/January, 2002
IET LABS, INC.
Standards • Decades • Strobes • Sound Level Meters • Bridges
www.ietlabs.com
534 Main Street, Westbury, NY 11590
in the
GenRad
TEL: (516) 334-5959 • (800) 899-8438 • FAX: (516) 334-5988
Tradition
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Related Manuals for IET Labs HARS-X Series
Summary of Contents for IET Labs HARS-X Series
- Page 1 PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT HARS-X SERIES High-Accuracy Decade Resistance Substituter User and Service Manual Copyright © 2002 IET Labs, Inc. HARS im/January, 2002 IET LABS, INC. Standards • Decades • Strobes • Sound Level Meters • Bridges www.ietlabs.com...
- Page 3 HARS-X Series 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 specifications. 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.
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Page 4: Table Of Contents
4.1.3 Procedure ..............7 4.2 Schematic ................7 Figures Figure 1.1 HARS-X Series High-Accuracy Decade Substituter ....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... -
Page 5: Warning
HARS-X Series WARNING OBSERVE ALL SAFETY RULES ‘WHEN WORKING WITH HIGH VOLTAGES OR LINE VOLTAGES. ELECTRICAL SHOCK HAZARD. DO NOT OPEN CASE. REFER SERVICING TO QUALIFIED PERSONNEL. HIGH VOLTAGE MAY BE PRESENT WITH HIGH VOLTAGE OPTIONS. WHENEVER HAZARDOUS VOLTAGES (> 45 V) ARE USED, TAKE ALL MEASURES TO... -
Page 7: Chapter 1 Introduction
High-quality gold-plated tellurium-copper binding posts serve to minimize the thermal emf effects which would artificially reflect a change in dc resistance measure- Figure 1.1. HARS-X Series High Accuracy Resistance ments. All other conductors within the instrument, as Substituter INTRODUCTION... -
Page 8: Chapter 2 Specifications
HARS Series Chapter 2 SPECIFICATIONS For convenience to the user, the pertinent specifications are given in an OPERATING GUIDE affixed to the case of the instrument. Figure 2.1 shows a typical example. SPECIFICATIONS Resistance Total Stability Long Term Temperature Max. Maximum Maximum Decade... - Page 9 HARS Series SINGLE DECADE UNITS Single-decade units are available with It may be panel mounted and inte- resistance as low as 1 mΩ per step to grated with additional units to form as high as 10 MΩ per step. These units potentiometer circuits or other con- satisfy many system applications re- figurations.
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Page 10: Figure 2.1 Typical Operating Guide Affixed To Unit
HARS Series SPECIFICATION... -
Page 11: Chapter 3 Operation
3.2.1 General Considerations ened. The HARS-X Series Decade unit provides three These considerations may be relaxed whenever terminals labeled H (high), L (low), and G (ground). single milliohms are considered significant for the task The H and L terminals are connected to the ends of being performed. -
Page 12: Thermal Emf Considerations
10-10-10-l0-10.10 Ω becomes: The highest-quality low-ernf components are used in the HARS-X Series. There nevertheless may be some minute thermal emf generated at the test leads 1 0 0 0 0 0.0 where they contact the gold banana jacks. -
Page 13: Chapter 4 Maintenance
For the direct-reading resistance meters or digital multim- HARS-X series, these limits for any resistance eters available that can verify the accuracy of these “R” are [R±(0.0001 R + 2 mΩ)]. For the A, units, especially when used in conjunction with stan- B, or Q series, see specifications. -
Page 14: Figure 4.1 Hars Series Schematic Diagram
HARS Series Figure 4.1. HARS Series Schematic Diagram MAINTENANCE...