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Page Title: The Decade Resistance Box
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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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