2312G INSTRUCTION MANUAL
56-101-00550-D CH.
3
11/7/14
Page 14 / 20
This effect can be circumvented by taking two measurements: the first, with test leads
connected in one polarity; and then, reversing the lead connections for the second
measurement. The true value is equal to the average of the two readings (i.e., add the two
readings and divide by two). The two readings must be taken in quick succession so that
the thermocouple temperature will be the same for both readings. If the thermocouples are
too hot, the readings will be too far from nominal to provide sufficient accuracy. In this case,
wait for the engine to cool further.
2. THERMOCOUPLE RESISTANCE TEST PROCEDURE
A. Disconnect at least one lead from system temperature indicator.
B. Insure 2312G meter reads zero (“0”).
C. Rotate the “FUNCTION” selector to “RX1”.
D.
Before connecting 2312G leads
, press and hold RED “CAL.” pushbutton while turning
“CAL. ADJUST” to move meter pointer to infinity (full scale).
E. Carefully connect test lead clips to thermocouple bank to insure a good electrical
connection. Press the BLACK “TEST” pushbutton while reading resistance directly on the
“RX1 / RX10” scale.
NOTE: If individual thermocouple is to be measured, disconnect at least one terminal
lead of thermocouple to be measured.
3. APPROXIMATE SYSTEM LEAD RESISTANCE TEST PROCEDURE
A. Disconnect at least one thermocouple lead from temperature indicator.
B. Insure 2312G meter is zero (“0”).
C. Rotate the “FUNCTION” selector to “RX1”.
D.
Before connecting 2312G leads
, press and hold RED “CAL.” pushbutton while turning
“CAL. ADJUST” to move meter pointer to infinity (full scale).
E. Insure thermocouple bank is connected to thermocouple system leads.
F. Carefully connect test lead clips to system lead wires at indicator end, insuring a good
electrical connection. Press the BLACK “TEST” pushbutton while reading resistance
directly on the “RX1 / RX10” scale. Multiply value obtained by ten (10).
4. PRECISION SYSTEM LEAD RESISTANCE TEST PROCEDURE
NOTE: Insure dash number of 2312G is applicable to resistance value of system
under test (Refer to Chapter 3, section 2.).
A. If approximate measurement is made as describe in section 3, “Approximate System Lead
Resistance Test Procedure”, and measurement is not within the range of “LEAD RES.”
