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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
SRac Series
Resistance Standard
User and Service Manual
Copyright © 2019 IET Labs, Inc.
Visit www.ietlabs.com for manual revision updates
SRac im/January 2019
www.ietlabs.com
IET LABS, INC.
Email: info@ietlabs.com
TEL: (516) 334-5959 • FAX: (516) 334-5988
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Summary of Contents for IET Labs SRac Series
- Page 1 ♦ ♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT SRac Series Resistance Standard User and Service Manual Copyright © 2019 IET Labs, Inc. Visit www.ietlabs.com for manual revision updates SRac im/January 2019 www.ietlabs.com IET LABS, INC. Email: info@ietlabs.com TEL: (516) 334-5959 • FAX: (516) 334-5988...
- Page 2 ♦ ♦ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT www.ietlabs.com IET LABS, INC. Email: info@ietlabs.com TEL: (516) 334-5959 • 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.
- Page 4 Safety Symbols General defi nitions of safety symbols used on the instrument or in manuals are listed below. Caution symbol: the product is marked with this symbol when it is necessary for the user to refer to the instruction manual. Hazardous voltage symbol: the product is marked with this symbol when high voltage maybe present on the product and an electrical shock hazard can exist.
- Page 5 To avoid the danger of introducing additional hazards, do not install substitute parts or perform unauthorized modifi cations to the instrument. Return the instrument to an IET Labs for service and repair to ensure that safety features are maintained in operational condition.
- Page 6 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 qualifi ed personnel HIGH VOLTAGES MAY BE PRESENT AT THE TERMINALS OF THIS INSTRUMENT WHENEVER HAZARDOUS VOLTAGES (>...
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Page 7: Table Of Contents
Contents Chapter 1 Introduction .................1 1.1 Introduction ....................1 Chapter 2 Specifi cations ................2 Specifi cations ....................2 Label ......................... 4 Chapter 3 Operation ..................6 3.1 Initial Inspection and Setup ..............6 3.2 Connections ....................6 3.2.1 Connections for values ≤190 kΩ ............. 6 3.2.2 Connections for values >... - Page 8 Figures and Tables Figure 1-1: SRac Series Resistance Standard ..........1 Table 2-1: SRac Specifi cations ..............2 Figure 2-1: Sample label affi xed to unit ............3 Figure 3-1: Connections for values ..............6 Table 4-1: Replaceable Parts List ..............9 Figure 4-1: SRac Replaceable Parts ............9...
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Page 9: Chapter 1 Introduction
18°C to 28°C. Because of the low temperature coeffi cient, they require no oil-or- temperature bath. The SRac series units are available in values ranging from 1 mΩ to 10 MΩ, with custom values available, to satisfy any requirement. The SRac series feature excellent stability and low temperature coeffi... - Page 10 SRX/SRC Series Chapter 2 SPECIFICATIONS For convenience to the user, the pertinent specifi cations are given in an OPERATION GUIDE, shown in Figures 1-1. SPECIFICATIONS Calibration conditions: Transit case: Optional Model SRC-100 light weight transit case At 23°C, low power, traceable to SI units. with handle, suitable for transporting and storing Connections as indicated in table.
- Page 11 SRX/SRC Series Specifi cations...
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Page 12: Chapter 2 Specifi Cations
23.5 Due: Calibrated Resistance (R) 999.996 48 m Meas. Uncertainty: 9.6 ppm Model: SRX-1 SN: J1-XXXXXXXX IET LABS, INC. Long Island, NY Email: info@ ietlabs.com · Tel: 516-334-5959 www.ietlabs.com Figure 1-1: Typical Operating Guide Affi xed to Unit Specifi cations... -
Page 13: Specifi Cations
SRX/SRC Series Chapter 3 OPERATION 3.1 Initial Inspection and Setup Binding Post Function CURRENT HI Current input from source (e.g. ohmmeter) This instrument was carefully inspected before ship- CURRENT LO Current return to source (e.g. ohmmeter) ment. It should be in proper electrical and mechanical SENSE HI Measurement point for a four-wire ohmmeter order upon receipt. -
Page 14: Environmental Conditions
0°C to 40°C to retain its accuracy within the specifi ed limits. 3.5 Shipping and Handling The SRac Series should not be exposed to any ex- cessive shock or temperature extremes. The option SRC-100, a lightweight transit case capable of stor-... -
Page 15: Chapter 4 Maintenance
4.1 Maintainability and Reliability 4.3.1 Calibration Interval It is possible to maintain SRac units indefi nitely. The recommended SRac Series calibration interval They are reliable due to their closed, rugged design is twelve (12) months. and sealed resistors. The units are resistant to elec-... -
Page 16: Required Equipment
Not Shown SRac-*-Res SRac resistor assembly for the required values with traceable cali- Replace * with nominal resistance value brations, such as the following standards available from IET Labs Table 4-1: Replaceable Parts List • SR-102 100 Ω • SR-103 1 kΩ...
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