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Page Title:
Capacitance Measurement Calibration |
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  TB 9-4920-451-35
(4) Adjust HI RANGE GAIN trimmer screw until display reads same as value
stamped above S7 switch (fig.1). If necessary repeat (3) above until no further adjustments
are required (R).
(5) Adjust MEGOHMMETER OFFSET trimmer screw until MEGOHMS meter
reads same value as stamped above S8 switch (fig.1) (R).
(6) Adjust MEGOHMMETER GAIN trimmer screw until MEGOHMS meter reads
same value as stamped above S9 switch (fig.1). If necessary repeat (5) above until no
further adjustments are required (R).
a. Performance Check
(1) Set MODE SELECT switch to MEAS EXT position.
(2) Set RANGE switch to LO position.
(3) Connect shorting plug (p/o TI) to TO PROBES LOZ COMP (fig 1).
(4) Connect variable capacitor to TI, G to TO PROBES LOZ and 115 to TO
PROBES HIZ.
(5) Adjust variable capacitor to 40 pF. TI display will indicate between 39.8 and
40.2 pF.
(6) Repeat technique of (5) above for settings and indications listed in table 4.
b. Adjustments. No adjustments can be made.
Table 4. Capacitance
Capacitance standard settings
Test instrument indications (pF)
(pF)
Min
Max
60
59.7
60.3
80
79.6
80.4
100
99.5
100.5
180
179.1
180.9
300
298.5
301.5
400
398
402
600
597
603
800
796
804
1000
995
1005
1
2000 1 2
1990
2010
1Set
RANGE switch to HI for 1000 and 2000 pF
2Connect
capacitance standard .002 G to HIZ and remaining banana jack to LOZ for 2000 pF.
CHANGE 1
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