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do
Zero-balance the bridge in accordance with the procedure in paragraph 3.5.
e.
Connect the test specimen either to the TEST binding posts (use the HI and
LO posts for 2-terminal specimens and the HI, LO, and -±- posts for
3-terminal specimens) or to the test jig or test leads, as required.
f.
Advance the CAPACITANCE control for a null indication on the meter.
g.
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 d thru cj„
h.
Repeat Steps f and g until a complete null is reached.
i.
Read the capacitance of the test specimen on the CAPACITANCE dial.
j.
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 8.
If the
DIVIDE G/MULTIPLY R switch is in the 1 position, correct the conductance
reading in accordance with Figure 9.
k. Read the equivalent parallel resistance of the test specimen on the R-scale of
CONDUCTANCE dial.
However, if a conductance correction was made in
Step j, relate the R-scale reading to the corrected G value.
l. If required, calculate the Q of the test specimen by using either the following
equation or the nomograph at the conclusion of this chapter.
Q
=
6.28C/G
where
C
= capacitance in pF
G = conductance in pmhos
m. If required, calculate the D of the test specimen by using either of the
following equations or the nomograph. Figure 6, at the conclusion of
this chapter.
D =
1/Q, or
D =
0.159G/C
where
C =
capacitance in pF
G =
conductance in pmhos
3*^*2
\r Gf' Rp, Q AND D MEASUREMENTS.1 In this procedure, the inductance of
the specimen is measured in terms of equivalent capacitance, which then is translated
to an inductance value by simple computation.
75D
b-370
25
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