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APPROXIMATE VALUE
DIVIDE G/
C/L
CONDUCTANCE
OF TEST SPECIMEN
MULTIPLY C
MULTIPLY R
CONTROL
(pF)
SWITCH
SWITCH
SWITCH
G-SCALE
100 to 1000
1
1
L
+1000
10 to 100
0.1
1
C
-100*
1 to 10
0. 01
10
C
-100*
0.1 to 1
0,001
100
C
-100*
0 toO. 1
0.0001
1000
C
-100*
* Tenth (red) subdivision on G-scale to the left of zero.
d. Zero-balance the bridge as described in paragraph 3.5.
e„ Set the meter switch to ZERO CENTER.
If necessary, adjust the C ZERO FINE
control for a midscale meter indication.
f. Refer to the chart in Step c, above, and set the CONDUCTANCE control to
the required position.
g. Adjust the PHASE control until the meter needle is at midscale„
h. Return the CONDUCTANCE control to zero on the G-scale.
i. If the C/L switch is at C, proceed to Step I .
If the C/L switch is at L, set
it to the C position.
j. Set the meter switch to ZERO LEFT and zero-balance the bridge as described
in paragraph 3.5.
k. Set the meter switch to ZERO CENTER.
If necessary, adjust the C ZERO
FINE control for a midscale meter indication.
l. Connect the test specimen either to the TEST binding posts (use the HI and LO
posts for 2-terminal specimens and the HI, LO,
posts for 3-terminal
specimens) or to the test jig or test leads, as required.
m. Advance the CAPACITANCE control for an exact midscale indication on the
meter.
n. Read the capacitance of the test specimen on the CAPACITANCE dial.
3.7.2
INDUCTANCE MEASUREMENTS ONLY,
The inductance of the test
specimen is measured in terms of equivalent capacitance, which then is translated to
an inductance value by simple computation.
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 insure thermal stabilation of the phase
detector circuit.
75D
fe-370
30
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