TB 9-4931-702-50
(37) Depress ARITH MEAN pushbutton with all four supplies set at standard cell
value. If null detector indication is not within 1 microvolt of null, repeat (1) through
(36) above. Record ARITH MEAN output value for use in loop closure check.
(38) Affix label to TI showing standard cell value used for calibration and a
statement to the effect that the ∆E control must be set to the last 3 digits of the standard
cell value for calibration to be valid.
b. Adjustments
NOTE
Remove TI protective cover only to make adjustments.
Replace for indications.
NOTE
In (1) through (4) and (6) below, the designation of the
adjustments for each reference supply is the same. When
reporting these adjustments, the component designator must
be prefaced with the proper supply designator. For example:
if working with supply No. 1, R25 should be reported as
A3A1R25; if working with supply No. 3, R25 should be
reported as A3A3R25
NOTE
Do not report the adjustments in this paragraph unless the
applicable measurement in the performance check exceeds
10 microvolts.
(1) Adjust supply No. 1. "1V CAL" control (R25, fig. 3) to obtain null on null
detector (R)
(2) Adjust supply No. 1, "1.018 CAL" control (R17, fig. 3) to obtain null on null
detector (R).
(3) Adjust supply No. 1, "1.019 CAL" control (R18. fig. 3) to obtain null on null
detector (R)
(4) Adjust supply No. 1, " 1.018/1.019 +∆E CAL" control (R19, fig. 3) to obtain null
on null detector (R)
(5) Adjust supply No. 1, "∆E CAL" control (R5, fig. 3) to obtain null on null
detector (R).
NOTE
In (5) above all four "∆E CAL" controls are designated R5.
They are four different adjustments and all are located on
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