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TM 55-6695-220-13&P
c.
Cable Adapter Leads Checkout.
(1) Set the Multi-meter to the 200 milliohm scale and check for continuity between cable ends, while referring to
Table 2-3 for wiring information.
(2) Set the Multi-meter to the 20 megaohm range and check for insulation breakdown between the connector
metal shell and the pins.
d.
Thermocouple Voltage Checkout.
(1) Use the Decade Resistance Box to apply a load across the thermocouple lead clips equal to the values
shown in Table 3-5.
Table 3-5. Thermocouple Load Resistance
Type
Resistance (Ohms)
Iron-Constantan (I-C)
17
Copper-Constantan (C-C)
17
Chromel-Alumel (C-A)
42
(2) Adjust the Regulated DC Power Supply or equivalent to 1.34 Vdc and apply this voltage to the appropriate
battery leads in place of the 1.5 volt battery.
(3) Adjust first the COARSE and second the FINE RHEOSTAT between each measurement, readjusting the
controls, if necessary, to keep the VOLTMETER pointer centered over the red line.
NOTE
Make sure the VOLTMETER rests directly over the zero mark with the RESISTANCE
AND VOLTAGE FUNCTION SWITCH in the OFF position as this possible error will
affect the results.
3-8
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