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NOTE:
Allow 15 minutes for warm-up after switching on.
b. If the test specimen is to be connected directly to the TEST binding posts,
remove the terminal shield.
If coaxial test leads or a test jig is to be used,
connect the leads or jig to the REMOTE TEST coaxial connectors.
Co Refer to the chart below and set the MULTIPLY C switch to a position
corresponding with the anticipated differential.
ANTICIPATED DIFFERENTIAL
VALUE (PF)
MULTIPLY C SWITCH
SETTING
100
to
1000
1
10
to
100
0.1
1
to
10
0.01
0.1
to
1
0.001
0
to
0.1
0.0001
d„ Zero-balance the bridge as described in paragraph 3.5.
e„ Connect the test specimen either to the TEST binding posts or to the REMOTE
TEST coaxial connectors, test jig, or test leads, as required.
f. At the REMOTE STD terminals connect a reference capacitor whose value and
accuracy are known.
g. Advance the CAPACITANCE control for a null indication on the meter.
If
the meter does not null, the value of the reference capacitor is greater than
the value of the test specimen; interchange the two items and readjust the
CAPACITANCE control.
h. Read the differential value on the CAPACITANCE dial.
If the two capacitors
were interchanged in Step g, above, the dial reading indicates the negative
differential value of the test specimen with respect to the reference capacitor.
3.9.2
MEASURING CAPACITOR TEMPERATURE COEFFICIENT IN AMPLITUDE MODE
a. Check that the initial settings on the front panel of the Model 75D are in
accordance with Table 4.
NOTE:
Allow 15 minutes for warm-up after switching on.
75D
b-370
36
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