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TM 55-6695-220-13&P
(2) Connect the eight ohm resistance standard to the thermocouple lead clips.
(3) Set the LEAD RESISTANCE SWITCH to the 8 OHM position.
(4) Rotate the LEAD RESISTANCE CONTROL of the null-balance galvanometer circuit back and forth to bring
the VOLTMETER pointer over the zero mark.
NOTE
The Decade Resistance Box may be used as a resistance standard, but first each test
value must be determined to an accuracy of ±0.002 ohm using the Digital Multi-meter.
(5) Depress the METER SENSITIVITY button to increase the circuit sensitivity and continue to adjust the LEAD
RESISTANCE CONTROL for a null condition. The error indicated by the LEAD RESISTANCE CONTROL
shall not differ from the resistance standard value by more than ±0.02 ohm.
(6) Repeat steps 1 through 5 for resistance standard values of 2 and 22 ohms, each time returning the LEAD
RESISTANCE CONTROL to the OFF position before changing resistors.
3-10
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