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d. Set the C/L switch to the L position,,
e. Zero-balance the bridge as described in paragraph 3.5.
f. Connect the test inductor to the REMOTE STD coaxial connectors (or to the
test jig or test leads, if used),
g. At the REMOTE STD terminals, connect a reference inductor whose value and
accuracy are known „
h0 Advance the CAPACITANCE control for a null indication on the meter.
If the
meter does not null, the value of the reference inductor is greater than the
value of the test inductor; interchange the two inductors and readjust the
CAPACITANCE control.
i0 Read the value on the CAPACITANCE dial and use the following equation to
convert the capacitance reading to an inductance differential value:
L = 25.33/C
where
L = inductance in mH
C = CAPACITANCE dial reading in pF
3.9.4 MEASURING DIFFERENTIAL CAPACITANCE IN PHASE MODE.
a. Check that the initial settings on the front panel of the Model 75D are in
accordance with Table 4.
NOTE:
Allow one hour warm-up to ensure thermal stabilization
of the phase detector circuit.
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 either to the REMOTE TEST coaxial connectors.
c. Refer to the following chart and set the MULTIPLY C, DIVIDE G/
MULTIPLY R, C/L switches to positions corresponding with the anticipated
differential.
(Do not adjust the CONDUCTANCE control.)
75D
b-370
38
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