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Page Title:
Preliminary Operating Procedure. |
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 TM 55-4920-325-14&P
Table 2-1. Control Panel, Operating Controls, Indicators, and Connectors (continued)
Name of Control,
Function
Index
Indicator, or
Number
Connector
PROBE MMF range
Provides adjustment of tank
29
unit main probe capacitance
selector switch
(1000 pF step)
(in 1000 pF steps, from 0 to
5000 pF) to be simulated by
(S402)
test set when testing air-
craft indicator.
Provides for rapid replace-
SPARE fuse (F401)
30
ment of defective 1/2 AMP
fuse (F101).
b. Connect grounding lead from test set
2-4. Preliminary Operating Procedure.
GROUND terminal (5) to suitable ground.
Before tests or measurements can be made us-
ing the test set, the following preliminary steps
CAUTION
must be performed. The steps given must be per-
Test set operates from 400 Hz, single
formed in the sequence indicated in order to en-
phase power source. Do not connect
sure proper system build-up.
test set to 60 Hz power source or dam-
age to test set may occur.
a. Set test set Power ON/OFF switch (2, fig-
ure 2-1) to OFF.
WARNING
c. Connect power cable (2237, figure 2-2) to
115V 400 CPS connector (4, figure 2-1) on test
The test set must be properly grounded
set.
before power is applied to the test set.
Do not operate an ungrounded test set
NOTE
under any conditions.
Test set can be operated from either ex-
NOTE
posed AC power terminals or con-
ventional AC outlets.
Suitability of ground connection de-
pends on where the test set is being
d. If conventional AC outlet is available, con-
used. If the test set is being used t o
nect AC adapter power cable 2238 to power cable
measure equipments installed on air-
2237. If conventional AC outlet is not available,
craft, ground the test set at any con-
but exposed AC power terminals are available,
venient point on the aircraft's ground
connect AC power cable 2239 to power cable
bus. If the test set is being used to mea-
2237.
sure equipment in a laboratory or shop,
e. Connect AC adapter power cable 2238 or
ground the test set to an appropriate
2239 to AC power source.
ground.
2-8
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