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d.
Zerobalance the bridge as described in paragraph 3.5.
e.
Connect the 10 kQ resistor between the TEST HI and LO
binding posts.
Insert the resistor pigtails fully into the binding
posts and tighten securely.
f.
Adjust the CAPACITANCE and CONDUCTANCE controls for a
null indication on the meter.
Read the CONDUCTANCE R-scale
dial.
g.
Refer to paragraph 1 .4,d, and check the CONDUCTANCE R-scale
reading for conformity with the resistance accuracy specification.
If the CONDUCTANCE R-scale reading is not consistent with the
specification, refer to the note at the end of paragraph 4.11 ,e.
h.
Remove the 10 kQ resistor.
e. Checking CONDUCTANCE R-Scale Calibration on the 1 Multiplier Range.
(1)
Test equipment:
One 1 k.Q deposited carbon resistor, 1%, 1/4 watt
or 1/2 watt.
(2)
Procedure:
a.
Adjust the Model 75D front panel controls in accordance with
Table 4.
b.
Check that the terminal shield is removed from the front panel
binding posts.
c.
Set the MULTIPLY C switch to 0.01 and the DIVIDE G/MULTIPLY
R switch to 1 .
d.
Zero-balance the bridge as described in paragraph 3.5.
e.
Connect the 1 kQ resistor between the TEST HI and LO binding
posts and tighten securely.
f.
Adjust the CAPACITANCE and CONDUCTANCE controls for a
null indication on the meter.
Read the CONDUCTANCE R-scale
dial. Correct readings from Figure 9, Page 28.
g.
Refer to paragraph 1 .4,d, and check the CONDUCTANCE R-scale
reading for conformity with the resistance accuracy specification.
If the CONDUCTANCE R-scale reading is not consistent with the
specification, refer to the note, below.
h.
Remove the 1 kQ resistor.
NOTE:
If the CONDUCTANCE control accuracy does not agree
with the specification, the Model 75D should be returned
to the factory for calibration.
Prior to shipment, please
call on either the Boonton Electronics Corporation or your
nearest sales engineering representative.
75D
b-370
72
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