iET SRL Series, Operation Manual

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1
SRL Series
1 Introduction
Chapter 1
INTRODUCTION
1.1 Introduction
The SRL Series (Figure 1.1) are extremely stable,
precise, laboratory or portable resistance standards.
Their ruggedness and small size plus their virtually
zero temperature
coeffi cient makes the SRL Series
ideal for any applications outside of laboratory en-
vironment within the temperature range of 18°C to
28°C. The temperature chart provided with each unit
enhances the accuracy by indicating the deviation
from nominal for the operating temperature range in
0.5°C increments. Because of the low temperature
coeffi
cient, they require no oil-or-temperature bath.
The SRL series units are available in values ranging
from 1 mΩ to 2 TΩ, with custom values available,
to satisfy any need. They are built with precision
resistors and use no adjustable resistors of any kind.
To further reduce errors caused by temperature
changes, the SRL units are built with a temperature
coeffi
cient of near zero at 23°C. The binding posts
are constructed of low-thermal emf material.
Figure 1-1: SRL Series Resistance Standard