2548H INSTRUCTION MANUAL
56-101-00420 Rev. C
Ch. 3
Nov
/
07
/
14
Page 28 of 33
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Figure 18 shows an adapter cable with BNC connectors to substitute the
amplifier. (The cable connections are made to the Test Set’s IND ±
jacks.)
Figure 18 SYSTEM CALIBRATION (METHOD 1), CONFIGURATION #3
(BNC
CONNECTORS)
Note: Some procedures require adding extra capacitance to represent a wetted
compensator. Other procedures require that the sumps not be drained (leaving that
amount of fuel to keep the compensator wet, i.e. unusable fuel).
Note: The Test Set’s COMPENSATOR SIMULATOR (COMP SIM) is generally used to
simulate a reference compensator capacitance. However, the COMP SIM can also
be used to simulate a Tank Unit circuit. If the COMP SIM is not used, install the
shorting cap on the Test Set’s COMP RECEPTACLE.
B. Test Procedure (Method 1)
(1) Setting “EMPTY” Adjustment
(a) Rotate the TEST FUNCTION selector to CAP BRIDGE.
(b) Set the TANK CAP pF by entering the FULL COMPENSATOR VALUE to be
simulated on the thumbwheel assembly.
(c) Set the COMP SIM pF by entering the two left hand digits determined from
step (b).
(d) Close appropriate circuit breakers.
(e) Set the Test Set’s ON/OFF switch to ON.
(f) Press and hold the COMP CAL pushbutton while alternating adjusting the
COMP CAL 0-10 and D. F. controls for the minimum reading.
