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PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT
SRC-Tnetwork
Resistance Standard
User and Service Manual
Copyright © 2022 IET Labs, Inc.
Visit www.ietlabs.com for manual revision updates
SRC-100T-Tnetwork im/August 2022
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 SRC-10T-Tnetwork
- Page 1 ¨ ¨ PRECISION INSTRUMENTS FOR TEST AND MEASUREMENT SRC-Tnetwork Resistance Standard User and Service Manual Copyright © 2022 IET Labs, Inc. Visit www.ietlabs.com for manual revision updates SRC-100T-Tnetwork im/August 2022 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 ................3 Specifi cations ....................3 Label ......................... 4 Chapter 3 Operation ..................5 3.1 Initial Inspection and Setup ..............5 3.2 Connections ....................5 3.3 Thermal emf Considerations..............5 3.4 Environmental Conditions ................. -
Page 9: Chapter 1 Introduction
SRC-Tnetwork Chapter 1 INTRODUCTION A T-network is illustrated in Figures 1.2 and 1.2 1.1 Introduction along with the formula to calculate the eff ective resistance. The SRC-Tnetwork is a standard resistor de- signed for calibration of various electrometers and megohmmeters. R1 + R2 Effective R = Positive... - Page 10 SRC-Tnetwork RESISTANCE STANDARD MODEL SRC-100T T-network CENTER TAP SOURCE OUTPUT 100 TW GUARD Figure 1-1: SRC-Tnetwork Standard Resistor Specifi cations...
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Page 11: Specifications
SRC-Tnetwork Chapter 2 SPECIFICATIONS For convenience to the user, the pertinent specifi cations are given in an OPERATION GUIDE, Operating temperature range: - 55 to 70°C < 80% RH Calibration conditions: At 23°C, low power, accredited calibration traceable to SI Altitude: <2000 m Using T-network calculation based upon calibration of the 3 internal resistors at a maximum of 200 V. - Page 12 SRC-Tnetwork Figure 1-1: Typical Operating Guide affi xed to the SRC-100T-Tnetwork Specifi cations...
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Page 13: Chapter 3 Operation
SRC-Tnetwork Chapter 3 OPERATION Keithley 6517A/B Connections 3.1 Initial Inspection and Setup When connecting to the 6517A/B make sure the short- ing link is between the GND and Guard Terminal and This instrument was carefully inspected before ship- connect the SRC-100T as shown in Figure 3-2. ment. -
Page 14: Environmental Conditions
SRC-Tnetwork 3.3 Environmental Conditions 3.3.1 Operating Temperature For optimal accuracy, SRC-Tnetwork should be used in an environment of 23°C. They should be allowed to stabilize at those temperatures after any signifi cant temperature variation. 3.3.2 Storage Temperature The SRC-Tnetwork should be maintained within the storage temperature range of 0°C to 40°C to retain its accuracy within the specifi... -
Page 15: Chapter 4 Maintenance
SRC-Tnetwork Chapter 4 MAINTENANCE 4.1 Maintainability and Reliability 4.3.1 Calibration Interval It is possible to maintain SRC-Tnetwork indefi nitely. The recommended SRC-Tnetwork calibration inter- They are reliable due to their closed, rugged design val is twelve (12) months. and resistors. The units are resistant to electro- magnetic interference (EMI) because of their metal If the instrument is used to transfer resistance values enclosure. -
Page 16: Required Equipment
SRC-Tnetwork 4.3.3 Required Equipment Many combinations of standards, transfer standards, meters, and bridges may be used to calibrate this instrument. The following are some possible choic- • A dual source guarded bridge • A high-precision, high-stability digital multime- ter (e.g. Fluke 8508A, Fluke 8588A or Keysight 3458A) or other DMM with an accuracy of 20 ppm or better for direct measurements.
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