TB 9-6625-2055-24
TIME control until first and second delayed time markers are 2.0
(9) Adjust
divisions apart. Adjust R625 (2) DVM ZERO (fig. 1) for time indication of 0.019 ms on
oscilloscope and then adjust R625 until time indication just changes to 0.020 ms.
NOTE
TIME control cannot be adjusted for exactly 2 divisions
If
between delayed-sweep time markers, note actual time
separation displayed. Then, follow procedure outlined in (9)
above and adjust R625 until time indication corresponds to
actual time separation displayed between delayed-sweep time
markers.
EXAMPLE: A 2.2 division time delay corresponds to a 0.022 ms time indication.
Adjust R625 for a time indication of 0.021 ms. Then adjust R625 until time indication just changes
to C4022 rms.
(10) Adjust TIME control fully ccw. Oscilloscope time indication will be 0.000 ms
and horizontal alignment of delayed sweep time markers will be within 0.1 division.
(11) Adjust DELAY TIME control to start first intensified portion on second time
TIME control to start second intensified portion on 10th time marker.
marker and
TIME control to horizontally align delayed-sweep traces (it may be
Further adjust
necessary to adjust TRACE SEP control to view the two delayed-sweep traces).
NOTE
TIME control cannot be adjusted to obtain 8 divisions
If
between intensified portions, preset R535 SECOND PICK OFF
(12) If necessary, adjust R620 DVM GAIN (fig. 1) until A time indication is 8.000 ms.
b. Adjustments. No further adjustments can be made.
12. DVM Zero and Gain (SN B088750 and Above)
a. Performance Check
TIME control fully ccw and TRACE SEP control ccw out of switch
(1) Adjust
detent position.
(2) Adjust DELAY TIME control to position the intensified portions near second
graticule line so that time markers in delay sweep display are on center graticule line.
TIME control until first and second delayed-time markers are 2.0
(3) Adjust
divisions (20 s) apart. Adjust R625 DVM ZERO (fig. 1) for time indication of 0.019 ms on
time indication just changes to
0.020 ms.