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TM 55-4920-383-13&P
2-7. Measuring Aircraft Tank Unit and Compensator Capacitance.
a. With the equipment set up as shown in figure 2-2, position Test Set switches as follows:
Switch
Position
ON/OFF (20, figure 2-1)
ON
DISPLAY SELECT (8)
CAP (pF)
CAPACITANCE FUNCTION (1)
A/C TEST-UNSH
CAPACITANCE RANGE (6)
200
NOTE
DISPLAY SELECT (8) switch must be in CAP (pF) position for all capacitance
measurements.
b. With the Test Set switches set as described, the Test Set is in the mode for meas-
ring aircraft tank unit capacitance. The number displayed on the Test Set digital display
(7) is the aircraft tank unit capacitance in picofarads. If the display is blinking 199.95, the
aircraft tank unit being measured has a capacitance greater than 200 pF. Rotate the
CAPACITANCE RANGE switch (6) one position at a time until the blinking stops and a
non-blinking number is obtained. The first position reached after 200 on the CAPACITANCE
RANGE switch (6) that yields a non-blinking reading will give the aircraft tank unit capaci-
tance to the greatest resolution. The overrange blinking condition for each position of the
CAPACITANCE RANGE switch (6) is as follows:
CAPACITANCE RANGE switch position
Overrange blinking number
200
199.95
1000
999.75
4000
3999.
8000
7998.
2-13
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