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TM 55-4920-383-13&P
(5) Adjust precision variable capacitor No. 2 until digital display (7) reads 888.0 pF. Check that precision
variable capacitor No. 2 setting is between 884.0 and 892.0 pF.
(6) Adjust precision variable capacitor No. 2 until digital display (7) reads 999.0 pF. Check that precision
variable capacitor No. 2 setting is between 994.0 and 1004.0 pF.
f.
Capacitance Simulation Accuracy Checkout.
(1) Connect equipment as shown in figure 4-2. Set precision variable capacitor No. 1 to 15.00 pF and No. 2
to 70.00 pF.
(2) Set DISPLAY SELECT switch (S) to CAP (pF), CAPACITANCE RANGE switch (6) to 200, and
CAPACITANCE FUNCTION switch (1) to SIM SET-COMP position.
(3) Adjust SIMULATORS-COMP control (13) to obtain digital display (7) readout of 50.00 pF.
(4) Set CAPACITANCE FUNCTION switch (1) to SIM SET-PROBE position. Adjust
SIMULATORS-PROBE control (24) to obtain digital display (7) readout of 25.00 pF.
(5) Set CAPACITANCE FUNCTION switch (1) to IND TEST-SIM position.
(6) Adjust capacitance bridge for 1 KHz, 30 volts excitation. Null the capacitance bridge. Check that
capacitance bridge bridge reads between 24.50 and 25.50 pF.
(7) Set CAPACITANCE FUNCTION switch (1) to IND TEST-A/C position and null capacitance bridge.
Check that capacitance bridge reads between 69.50 and 70.50 pF.
(8) Set CAPACITANCE FUNCTION switch (1) to IND TEST-A/C + PROBE SIM position and null
capacitance bridge. Check that capacitance bridge reads between 94.50 and 95.50 pF.
(9) Set CAPACITANCE FUNCTION switch (1) to IND TEST-A/C + PROBE SIM + COMP SIM position
and null capacitance bridge. Check that capacitance bridge reads between 94.50 and 95.50 pF.
(10) Set CAPACITANCE FUNCTION switch (1) to IND TEST-SIM position. Move capacitance bridge
“low” lead to INDICATOR-COMP connector (21) and connect shorting cap to INDICATOR-UNSH connect or (21).
Null the capacitance
4-8
Change 3
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