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NOTE:
Allow one hour warm-up to ensure thermal
stabilization of the phase detector circuit.
b„ Check that the oven is
turned off and that ambient temperature requirements
are in accordance with the user's specification.
c. Connect the oven coaxial cables to the REMOTE TEST coaxial connectors.
d. Refer to the chart below and set the MULTIPLY C, DIVIDE G/MULTIPLY R,
and C/L switches to positions corresponding with the anticipated differential.
(Do not adjust the CONDUCTANCE control.)
ANTICIPATED
DIFFERENTIAL
VALUE (PF)
MULTIPLY C
SWITCH
DIVIDE G/
MULTIPLY R
SWITCH
C/L
SWITCH
CONDUCTANCE
CONTROL
G-SCALE
100 to 500
1
1
L
+1000
10 to 1 00
0.1
1
C
-100*
1 to 10
0.01
10
C
-100*
0.1 to 1
0.001
100
C
-100*
0 to 0.1
0.0001
1000
C
-100*
*
Tenth (red) subdivision on G-scale to the left of zero.
e„ Zero-balance the bridge as described in paragraph 3.5.
f. Set the meter switch to ZERO CENTER.
If necessary, adjust the C ZERO FINE
control for a midscale meter indication.
g. Refer to the chart in Step d, above, and set the CONDUCTANCE control to
the required position.
h. Adjust the PHASE control until the meter needle is at midscale.
i. Return the CONDUCTANCE control to zero on the G-scale.
If the C/L
switch is at C, proceed to Step m, below.
j„ If the C/L switch is at L, set it to the C position.
k„ Set the meter switch to ZERO LEFT and zero balance the bridge as described in
paragraph 3.5.
l. Set the meter switch to ZERO CENTER.
If necessary, adjust the C ZERO FINE
control for a midscale meter indication.
m. Connect a test specimen of known value to the oven-chamber terminals.
n. At the REMOTE STD terminals, connect a stable, variable capacitor whose
range covers the value of the test specimen plus the capacitance introduced
into the bridge circuit in Step o, below.
o. Establish a midscale dial reference by advancing the CAPACITANCE control
to 500.
75D
b-370
40
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