TB 9-6625-1062-24
NOTE
If measurements exceed 0.3 pF from nominal on the low
range, or 1.5 pF from nominal on the high range, perform (1)
through (3) below.
(25) Repeat technique of (22) through (24) above at each remaining low range setting
on test report. Record values on test report.
(26) Move shoring bar of TI to 115 and G terminals.
(27) Connect capacitance bridge UNKNOWN HIGH and LOW terminals to TI 1150
and G terminals.
(28) Adjust TI for indication of 100 on dial.
(29) Measure capacitance and record value.
(30) Subtract value recorded in (13) above from value recorded in (31) above. Record
value on test report.
NOTE
If measurements exceed 0.3 pF from nominal on the low
range, or 1.5 pF from nominal on the high range, perform (1)
through (3) below.
(31) Repeat technique of (28) through (30) above at each remaining high range
setting on test report. Record values on test report.
b. Adjustments
(1) To adjust the low range, remove the correction chart cover and cover screws
(fig. 1) and adjust C1 LOW RANGE to center the maximum positive and maximum
negative error around the nominal.
Example I:
a. Maximum positive error: +0.12 pF
b. Maximum negative error: -0.04 pF
c. Algebraic difference (a-b):
0.16 pF
d. a - b 2 = New maximum and
minimum error values:
0.08
Example II:
a. Maximum positive error: +0.12 pF
b. Maximum negative error: +0.04 pF
c. Algebraic difference (a-b):
0.08 pF
d. a - b 2 = New maximum and
minimum error values:
0.04
(2) Set dial to the point where the maximum positive error was recorded and adjust
C1 LOW RANGE (fig. 1) to obtain the maximum positive value calculated in (1) above.
Check at the maximum negative error point, and repeat adjustments as required.
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