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e.
Connect the free end of the REMOTE TEST HI cable to the
remaining terminal on the CS-100.
f.
Adjust the CAPACITANCE and CONDUCTANCE controls
for a null indication on the meter,,
Read the CAPACITANCE
dial and compare the reading with the CS-100 value.
g.
Refer to paragraph 1 .4,a, and check the pF reading derived
in Step f , above, for conformity with the capacitance accuracy
specification.
If the accuracy of the pF reading is not consistent
with the specification, perform Steps h through o , below.
h.
Remove the CS-100 and the coaxial cables from the Model 75D„
i.
Remove the Model 75D cabinet (par. 4.12).
j„
Set the CAPACITANCE control to zero and the CONDUCTANCE
control to G-scale zero.
k.
Remove the cover plate from the bridge assembly (par. 4.13).
l.
Repeat Steps c through g , above.
m.
Set the CAPACITANCE control to the exact value stamped on
the CS-1 00.
n.
Adjust C507 for a null indication on the meter.
o.
Remove the CS-100.
e. Calibrating the CAPACITANCE Control on the 0.01 Multiplier Range (C510).
(1)
Test equipment:
Capacitance Standard CS-10 (Boonton Electronics
Corporation) or equivalent 10 pF capacitance standard.
Two RG-58/U
coaxial cables, each approximately four inches long and terminated
in BNC connectors.
(2)
Procedures:
a.
Check that the following conditions are observed:
the
Model 75D cabinet is removed, the bridge assembly cover plate
is removed, one RG-58/U cable is connected to the REMOTE
TEST LO connector on the Model 75D and the other RG-58/U
cable is connected to the REMOTE TEST HI connector.
b„
Adjust the Model 75D front panel controls in accordance with
Table 4, except set the MULTIPLY C switch to .01 .
c.
Connect the free end of the REMOTE TEST LO cable to either
terminal on the CS-10.
d.
Zero-balance the bridge as described in paragraph 3.5.
e.
Connect the free end of the REMOTE TEST HI cable to the
remaining terminal on the CS-10.
f.
Adjust the CAPACITANCE and CONDUCTANCE controls for a
null indication on the meter.
Read the CAPACITANCE dial and
compare the reading with the CS-10 value.
g.
Refer to paragraph 1 .4,a, and check the pF reading derived in
Step f , above, for conformity with the capacitance accuracy
specification.
If the accuracy of the pF reading is not consistent
with the specification, perform Steps h through
j , below.
75D
b-370
68
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