2548H INSTRUCTION MANUAL
56-101-00420 Rev. C
Ch. 3
Nov
/
07
/
14
Page 19 of 33
(5) Read the resistance on the MEGOHMS scale and verity that the resistance is not less
than the resistance referenced for a shield to ground for the applicable aircraft.
Note: The meter pointer may drift slowly after initial movement because of
capacitance charging time or presence of moisture. Allow the pointer to
stabilize or to reach minimum acceptable scale value.
(6) Rotate the INS TEST POINTS selector switch to each of the remaining positions.
Repeat step (5) for each switch position. (If configuration is in accordance with Figure
9, access the other bulkhead connectors and repeat the procedure to read resistance.)
(7) Turn T/S set OFF.
Note: Section 4. SYSTEM INSULATION TEST
should be performed after an
individual insulation test and/or repair is done and
before
performing section 6.
SYSTEM CAPACITANCE TEST
and/or system calibration.
6. SYSTEM CAPACITANCE TEST
Note
:
If the system capacitance does not produce the required results, perform the
steps listed in section.
A. Test Set Configuration
(1) Rotate the Test Set's TEST FUNCTION selector switch to CAP BRIDGE.
B. Aircraft Connections
Note: In order to do the desired test, it may be necessary to set an aircraft tank selector
switch to a required position. Refer to the appropriate Maintenance Manual for
the proper procedure.
(1) Connect the adapter cable connector to the aircraft connector that has been
removed from the amplifier (refer to Figure 10).
Figure 10 CONFIGURATION OF CAPACITANCE TEST
