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  TB 9-4920-454-35
(6) Adjust resistance standard for a 0 indication on RESISTANCE meter. If
resistance standard does not indicate between 21.95 Ω and 22.05 Ω, perform b (3) below.
(7) Repeat (4) and (6) above for 15 Ω. If resistance standard does not indicate
between 14.95 Ω and 15.05 Ω, perform b (4) below.
(8) Repeat (4) and (6) above for 8 Ω. If resistance standard does not indicate
between 7.95 Ω and 8.05 Ω, perform b (5) below.
(9) Repeat (4) and (6) above for 4.21 Ω. If resistance standard does not indicate
between 4.16 Ω and 4.26 Ω, perform b (6) below.
b. Adjustments
(1) Connect multimeter to RESISTANCE CHECK meter terminals, observing
polarity. Adjust resistance standard to 22 Ω. Adjust R13 (fig. 12) ccw. Record multimeter
indication, disregarding polarity sign. Adjust R13 (fig. 12) cw. Record multimeter
indication, disregarding polarity sign.
(2) Determine the mean value of indications recorded in (1) above. Adjust R2 (fig. 12)
to this value, then disconnect multimeter.
(3) Set resistance standard to 22 Ω and adjust R13 (fig. 12) for a 0 indication on
RESISTANCE CHECK meter (R).
(4) Set resistance standard to 15 Ω and adjust R10 for a 0 indication on
RESISTANCE CHECK meter (R).
(5) Set resistance standard to 8 Ω and adjust R7 for a 0 indication on
RESISTANCE CHECK meter (R).
(6) Set resistance standard to 4.21 Ω and adjust R4 for a 0 indication on
RESISTANCE CHECK meter (R).
15. Aircraft Indicator
a. Performance Check
(1) Replace BH-823 adapter with BH-822 adapter in equipment setup shown in
(2) Set FUNCTION SELECT switch to A/C IND CHK and RESISTANCE & A/C
INDICATOR CHECK switch to NULL BAL.
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