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TM 55-4920-383-13&P
c.
To measure the capacitance of the aircraft compensator, position Test Set switches
as in paragraph 2-7(a) for aircraft tank unit capacitance measurement, except set CAPACI-
TANCE FUNCTION switch (1) to A/C TEST-COMP position. Set CAPACITANCE RANGE
switch (6) to appropriate position to read capacitance to greatest resolution as described in
paragraph 2-7(b).
2-8.
Measuring Aircraft Tank Unit and Compensator Insulation Resistance and External
Resistance.
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)
RES (MEG)
RESISTANCE FUNCTION (11)
A-B
RESISTANCE RANGE (12)
0.1-1
NOTE
DISPLAY SELECT (8) switch must be in RES (MEG) position for all resistance
measurements.
b.
With the Test Set switches positioned as described, the Test Set is in the mode for
measuring aircraft tank unit insulation resistance, the resistance betweeen COAX A and
UNSH B Test Set receptacles (18). The number displayed on the Test Set digital display (7)
is the resistance in megohms.
(1) If the display is blinking .9900, the aircraft tank unit being measured has an
insulation resistance greater than 1 megohm. Rotate the RESISTANCE RANGE switch (12)
one position at a time until the blinking stops and a non-blinking number is obtained. The
overrange blinking condition for each position of the RESISTANCE RANGE switch (12) is as
follows:
2-14
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