TM 55-1520-240-23-7
8-80.5.1
TEST AND ADJUST FUEL QUANTITY INDICATOR USING PSD 60-1AF FUEL QUANTITY
TEST SET
(Continued)
8-80.5.1
SECTION B: MEASURING INSULATION RESISTANCE
OF INTANK WIRING AND PROBES
1.
Complete Section A, steps 1 thru 11.
2.
Rotate SELECT switch (S-3) to LOZ-HIZ.
NOTE
The PSD60-1AF tester indicates
"over-range" above 10,000 megohms
by flashing three colons and
displaying four zeros (Figure 25).
3.
Allow reading to stabilize for 30 seconds. Verify
that insulation resistance reading displayed is
over 20 megohms.
4.
Rotate SELECT switch (S-3) to COMP-HIZ.
5.
Allow reading to stabilize for 30 seconds. Verify
that insulation resistance reading is over 20
megohms.
6.
Rotate SELECT switch (S-3) counterclockwise,
pausing for 30 seconds at each position. Verify
that reading in each remaining position is over
1 megohm.
SECTION C: CALIBRATE DIAL INDICATION TO
ACTUAL EMPTY TANK
1.
Complete Sections A and B.
2.
Rotate FUNCT switch (S-2) to MEASURE INT.
3.
Rotate SELECT switch (S-3) to TU.
4.
Disconnect "T" cable from TU terminals of tester.
5.
Connect "T" cable lead marked "MAIN & AUX
HIZ" to INDICATOR HIZ terminal (J-2).
6.
If calibrating a MAIN TANK, connect "T" cable
MAIN LOZ lead to INDICATOR LOZ terminal
(J-1) DO NOT connect MAIN CP lead.
7.
If calibrating an AUX TANK, connect "T" cable
AUX LOZ lead to INDICATOR LOZ terminal (J-1).
DO NOT connect AUX CP lead.
8-248
