TB 9-6625-2134-24
(27) Reduce FREQUENCY SPAN/DIV control towards 0 Hz (10 ms), and adjust
center frequency control for peak signal amplitude.
(28) Adjust REFERENCE LEVEL control so trace is approximately midscreen.
(29) Adjust R1021 (fig. 1) until trace is parallel with crt graticule lines.
(30) Adjust REFERENCE LEVEL control so trace is approximately 15 to 20 dB
below top of screen.
(31) Adjust R1051 (fig. 1) for the straightest trace at top and bottom of screen while
alternately switching between 2 dB/DIV and 10 dB VERTICAL DISPLAY pushbuttons.
(32) Press DIGITAL STORAGE pushbuttons to on and use PEAK/AVERAGE
cursor control to position cursor at top and bottom of screen as a reference line.
(33) Press 2 dB/DIV VERTICAL DISPLAY pushbutton to on and adjust
REFERENCE LEVEL control until trace is within crt graticule area.
(34) Adjust INTENSITY control until trace is just visible.
(35) Adjust R1030 (fig. 1) until brightness of readout characters is visible and
continue until trace becomes visible.
(36) Rotate INTENSITY control back and forth and note that brightness of
characters is visible before the trace. If not, repeat technique of (33) through (35) above.
Figure 5. Deflection Amplifier - Equipment Setup.
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