TB 9-4920-454-24
13. Insulation Resistance
a. Performance Check
(1) Disconnect heater probes and heater cable from TI.
(2) Set FUNCTION SELECT switch to INSUL. INSULATION RESISTANCE
meter should indicate infinity.
(3) Connect equipment as shown in figure 11.
Figure 11. Insulation resistance and resistance check.
.
(4) Set resistance standard for 0
(5) Set INSULATION CHECK switch to RX100. If INSULATION RESISTANCE meter
does not indicate 0, perform b (1) below.
(6) Adjust resistance standard for an indication of 100 on INSULATION
RESISTANCE meter. Resistance standard will indicate between 9.0 and 11 k .
(7) Set resistence standard to its lowest value. Set INSULATION CHECK switch
to RX1000. If INSULATION RESISTANCE meter does not indicate 0, perform b (2) below.
(8) Adjust resistance standard for an indication of 100 on INSULATION CHECK
meter. Resistance standard will indicate between 90 and 110 k .
b. Adjustments
(1) Adjust R30 (fig. 12) for an INSULATION CHECK meter indication of 0 (R).
(2) Adjust R27 (fig. 12) for an INSULATION RESISTANCE meter indication of 0 (R).