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b. If coaxial test leads or a test Jig is to be used, connect the item to the
REMOTE STD coaxial connectors.
c. Determine the tolerance limit required 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.) If the tolerance is in
percentage, convert the percentage tolerance to inductance values and
algebraically add the required tolerance to the nominal value of the specimen.
(For example, a - 5% tolerance for a nominal 0„4 mH inductor converts to
i 0.02 mH and becomes 0.42 mH for the upper limit and 0.38 mH for the
lower limit.)
TOLERANCE LIMIT
(pF)
MULTIPLY C
SWITCH
DIVIDE G/
MULTIPLY R
SWITCH
C/L
SWITCH
CONDUCTANCE
CONTROL
G-SCALE
25 pH to 250 pH
1
1
C
+1000
250 pH to 2.5 pH
0.1
1
L
-100*
2.5 mH to 25 mH
0.01
10
L
-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 adjust the CONDUCTANCE control
to the required position.
g. Adjust the PHASE control until the meter needle is exactly at midscale.
h. Return the CONDUCTANCE control to zero on the G-scale.
i. If the C/L switch is at L, proceed to Step I .
If the C/L switch is at C, set
it to the L 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. Convert the inductance limit value to an equivalent capacitance value.
Use
the following equation:
C = 25.33/C
where
C = capacitance in pF
L =
inductance in mH
(If the upper limit were required in the Step c example, 0.42 mH would
convert to 60.31 pF.
If the lower limit were required, 0.38 mH would
convert to 66.66 pF.)
75D
b-370
34
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