TB 9-4931-700-50
(11) Repeat technique of (8), (9), and (10) above for frequencies of 50 Hz, and 1, 10,
50, and 100 kHz. Distortion will be .06 percent or less.
(12) Press OUTPUT OFF pushbutton.
b. Adjustments
NOTE
Deenergize TI when removing or installing circuit boards.
(1) Remove circuit board A12A5 (fig. 1) from TI and extend -circuit board A12A7
(2) Press FREQUENCY RANGE X10K pushbutton and adjust FREQUENCY
control to obtain FREQ scale indication of 5.
(3) Connect oscilloscope (A7) to A12A7TP2 (fig. 1), using probe (B11) and connect
ac/dc voltmeter (A1) to A12A8TP1 (fig. 1).
(4) Center adjustments A12A7R26 and A12A7R29 (fig. 1).
(5) Adjust 112A7C14 (fig. 1) to obtain minimum amplitude of the ac signal
displayed on oscilloscope (R).
(6) Alternately adjust A12A7R26 and A12A7R29 (fig. 1) to obtain minimum
amplitude of ac signal displayed on oscilloscope.
(7) Repeat (5) and (6) above to obtain optimum indication. The amplitude of ac
signal should be less than 0.05 V p-p.
(8) Ac/dc voltmeter will indicate 0 2 mV dc.
(9) Adjust A12A7R26 and A12A7R29 (slightly) to obtain an ac/dc voltmeter
indication of 0 2 mV dc.
(10) Repeat (5) through (9) as necessary until ac signal is less than 0.05 V P-P and
dc voltage is 0 2 mV dc.
(11) Replace circuit boards in TI.
(12) Press FREQUENCY RANGE X1K pushbutton and adjust FREQUENCY
control to obtain FREQ scale indication of 1.
(13) Extend circuit board A12A8 (fig. 1), using extender board furnished with TI.
(14) Connect ac/dc voltmeter to A12A8TP1 (fig. 1) and adjust A12A8R32 to obtain
indication of 0.1 V ac (R).
indication of between -.99 and 1.1 V dc (R).
obtain indication of between 0.25 and 0.35 V dc (R).
(17) Replace circuit board in TI.
13. Power Supply (Model 745A)
NOTE
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