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a. Check that the initial settings on the front panel of the Model 75D are in
accordance with Table 4.
b. If coaxial test leads or a test jig is to be used, connect the component to the
REMOTE STD coaxial connectors.
NOTE:
The inductance of the test leads will be included in the measurement.
c. Determine the approximate inductance of the test specimen and set the
MULTIPLY C switch as indicated in the following chart.
APPROXIMATE VALUE
MULTIPLY C SWITCH
OF TEST SPECIMEN
SETTING
25 pH to 250 pH
1
250 pH to 2.5 mH
0.1
2.5 mH to 25 mH
0.01
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 specimen to the REMOTE STD coaxial connectors
(or to the test jig or test leads, if used).
g. Advance the CAPACITANCE control for a null indication on the meter.
h. Advance the CONDUCTANCE control for a null indication on the meter.
NOTE:
If the meter does not null, set the DIVIDE G/MULTIPLY R switch to
successively lower positions and adjust the CONDUCTANCE control
until a null is reached.
Then remove the specimen, set the CAPACITANCE
and CONDUCTANCE controls at zero, and repeat Steps e thru h.
i. Repeat Steps g and h until a complete null is reached.
j. Read the value on the CAPACITANCE dial and use the following equation
to convert the capacitance reading to an inductance value:
L =
25.33/C
where
L =
inductance in mH
C =
CAPACITANCE dial reading in pF
k. Read the conductance of the test specimen on the G-scale of the
CONDUCTANCE dial.
If the MULTIPLY C switch is in the 1 position,
correct the conductance reading in accordance with Figure 4.
If the
DIVIDE G/MULTIPLY R switch is in the 1 position, correct the conductance
in accordance with Rgure 5.
l. Read the equivalent parallel resistance of the test specimen on the R-scale
75D
b-370
28
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