TB 9-6625-967-35
17. CH1 and CH2 Dc Balance
a. Performance Check
(1) Turn TI CHI VARIABLE VOLTS/DIV control from CALIB to fully
counterclockwise. If display on oscilloscope (A5) crt moves vertically, perform b(1) below.
(2) Turn TI MODE switch to CH2 and depress TRIGGER CHI ONLY PULL switch.
(3) Turn TI CH2 VARIABLE VOLTS/DIV control from CALIB to
fully
counterclockwise. If display on oscilloscope crt moves vertically, perform b(2) below.
b. Adjustments
(1) Adjust CH1 DC BAL (front panel screwdriver) adjustment for no vertical
movement of trace when VARIABLE control is turned from CALIB to fully
counterclockwise.
(2) Adjust CH2 DC BAL (front panel screwdriver) adjustment for no vertical
movement of trace when VARIABLE control is turned from CALIB to fully
counterclockwise.
18. CH1 Gain
a. Performance Check
(1) Position TI controls as listed in (a) through (c) below:
(a) CH1 AC-DC-GND switch to DC.
(b) CH1 VARIABLE VOLTS/DIV control to CALIB.
(c) MODE switch to CH1.
(2) Connect equipment to TI CH1 input as shown in figure 2.
(3) Adjust time base plug-in (A8) TRIGGERING LEVEL control for automatic
triggering.
(4) Adjust meter calibrator (A3) frequency to 400 Hz and amplitude output for
000.3536 volt ac.
(5) Adjust ratio transformer (A6) until 5 divisions of deflection are displayed on
oscilloscope (A5) crt. Ratio transformer will indicate between .04850 and .05150.
(6) Set TI CH1 VOLTS/DIV switch to .02.
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