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of the CONDUCTANCE dial.
However, if a conductance correction was
made in Step k, relate the R-scale reading to the corrected G value.
m. The Q of the test specimen may be calculated by the equation:
Q =
159/LG
where
L =
inductance in mH
G =
conductance in pmhos
n. If required, calculate the D of the test specimen by using the following
equation:
D
=
0.00628LG
where
L
=
inductance in mH
G =
conductance in pmhos
PART III . PHASE-MODE MEASUREMENTS
3.7
GENERAL,.
Use the phase mode of operation to measure C or L when an Rp,
G, Q or D measurement is not required.
The following procedures respectively measure
capacitance and inductance by phasing out the resistive component introduced by the
test specimen so that the meter is insensitive to loss. When reading values on the
CAPACITANCE dial during the following procedures, apply the MULTIPLY C factor to
the reading.
(If the ground-plane adapter is being used, disregard Step b of paragraph
3.10.)
3.7.1
CAPACITANCE MEASUREMENTS ONLY
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 a test jig or coaxial test leads are to be used,
connect the jig or leads to the REMOTE TEST coaxial connectors.
(Disregard
this step if the ground-plane adapter is being used.)
c. Determine the approximate capacitance value of the test specimen and set
the MULTIPLY C, DIVIDE G/MULTIPLY R, and C/L switches to the positions
indicated in the chart below.
(Do not adjust the CONDUCTANCE control.)
75D
b-370
29
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