TM 55-4920-399-13&P
Section I. GENERAL INFORMATION
above switch S6 and read that value on the digital
CAPACITANCE display.
Panel Assembly, for support of the following in-
structions.
i. Switch S6 to the OUT position and switch S7
to the IN position.
j. Adjust HI-RANGE GAIN for the capacitance
value, approximately 5000pF, shown above switch
Test Set must be grounded before con-
S7 and read that value on t h e digital
necting to aircraft fuel probes.
CAPACITANCE display.
k. Switch S7 to the OUT position and close the
a. Put the MODE SELECT switch in the OFF
CALIBRATION ADJUSTMENTS cover.
position.
l. Turn the MODE SELECT switch to the OFF
b. Attach the Input Power Cable Wiring
position.
Harness to the Test Set and to either Adapter
m. Attach the proper Adaptor Cable Assembly
Cable I or Adapter Cable II, depending on the
to the Master Cable per the following Table 2-1 and
available power facility. Attach the Adapter Cable
Figure 2-1.
I or II to 115 volt, 400 Hertz power source.
n. Turn the MODE SELECT switch to the
MEAS EXT position. Turn RANGE switch to the
t a n k unit capacitance measurements use the
following procedures.
display for T/U or COMP by toggling the T\U -
COMP switch.
a. Connect the Master Cable, Part Number
1000963, to the Test Set in six places.
2-3. Tank Unit Insulation Resistance
b. Turn the MODE SELECT switch to the
Measurements.
MEAS EXT position, the T/U COMP switch to the
a. Turn the MODE SELECT switch to the MEG
T/U position, and the RANGE switch to the LO
position.
position.
to the EXT position.
JUSTMENTS and put switch S-5 (farthest left of
the five switches) to the IN position. All other
switches (S-6 through S-9) should be in the OUT
cover and put switch S8 to the IN position.
position.
d. A d j u s t L O - R A N G E O F F S E T f o r t h e
above switch S8. Read that value on the megohm-
above switch S5 and read that value on the digital
meter on the panel.
CAPACITANCE display.
e. Switch S8 to OUT position and S9 to the IN
e. Switch S5 to the OUT position and switch S6
position.
to the IN position.
f. Adjust MEGOHMMETER GAIN for the
f. Adjust LO-RANGE GAIN for the capacitance
value, approximately 900pF, shown above switch
shown above switch S9. Read that value on the
S6 and read that value on t h e digital
megohmmeter on the panel.
CAPACITANCE display.
g. Switch S9 to the OUT position and close the
g. Place the RANGE switch in the HI position.
CALIBRATION ADJUSTMENTS cover.
h. A d j u s t H I - R A N G E O F F S E T f o r t h e
h. Connect the proper cable and measure insula-
tion resistance on megohmmeter.
2-1