TB 9-6625-2024-24
Table 4. Power Supply Check
Test instrument
Digital multimeter indications
test points
(V Dc)
(fig. 1) (V)
Min
Max
-15
-14.7
-15.3
+5
+4.85
+5.15
+15
+14.7
+15.3
+50
+49.4
+50.6
+130
+124.8
+135.2
-29601
-2871
-3049
1Use
high-voltage probe.
b. Adjustments. Adjust R881 50 ADJ (fig. 1) for multimeter indication of 50 V dc (R).
14. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
CALIBRATION PROCESS FOR VERTICAL AMPLIFIER AM-6565/U AND
TEKTRONIX TYPES 7A15A AND 7A15AN OPT 11
15. Equipment Setup
a. Remove left side panel from TI and oscilloscope.
b. Install TI into oscilloscope left vertical compartment and dual time base into
horizontal (right) compartment.
c. Position TI controls as listed in (1) through (5) below:
(1) POSITION control to midrange.
(2) POLARITY switch to +UP.
(3) MAG switch to X1.
(4) VOLTS/DIV switch to 10 mV and VARIABLE control fully cw (detent).
(5) AC/GND/DC switch to DC.
d. Press oscilloscope VERT MODE LEFT and TRIG SOURCE LEFT and TRIG
SOURCE VERT MODE pushbuttons.
e. Set dual time base TIME/DIV OR DLY TIME switches to 1 ms and CAL control
fully cw to detent.
f. Energize equipment and allow at least 15 minutes for warm-up.
g. Adjust POSITION control to center trace on oscilloscope center horizontal graticule line.
h. Rotate VARIABLE control throughout its range. If oscilloscope display shifts more
than 0.5 major division, adjust R221 DC BAL (fig. 3) for minimum shift as VARIABLE
control is rotated throughout its range.
