Section 3
3-49
3.8. MEASUREMENT OPERATION GUIDE
3.8.1. Introduction
This section contains information regarding the measurement of low value resistors and low
value resistance thermometers in the ranges of Rs equal to 1 m to Rs equal to 10 k as
four terminal measuring devices. It also contains information on the measurement of high
resistance values in the range of Rs equal to 100 k to Rs equal to 1 G.
A section on low resistance measurements (Rs = 1 ) is included, where use is made of the
Guildline model 9923 and model 6623 range extenders.
Thermometry applications use of the 6675A is discussed in section 3.8.5.
3.8.2. Resistance Measurement Normal Ohms - 1 m Rs
10 k
The Model 6675A bridge in its normal ohms mode enables measurement of resistance of
values up to 10 k : 100 k (Rx:Rs). Several types of resistance thermometers, each
involving a different resistance range, reference resistor and thermometer current can also be
measured in this mode. Figure 3-4 shows a typical front panel connection for this
measurement mode. A suggested guarding termination is shown in Figure 3-5
NOTE:
In this as in all measurements, optimum results will be obtained if the environment is
controlled. The recommendations in the Instrument Society of America (ISA)
publication ISA RE52.1, especially in regards to relative humidity should be observed.
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