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Figure 4. Test instrument - left view.

Calibration Procedure For Oscilloscope Os-245(P)/U, And Types 7603 And 7603N Opt 11S, Vertical Amplifier Am-6565/U, And Types 7A15A And 7A15An Opt 11, And Dual Time Base Td-1085/U And Td-1159/U And Types 7B53A, 7B53An Opt 5 And Opt 11S Page Navigation
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TB 9-6625-2024-24
(2) Set oscilloscope calibrator MARKER output for 1 ms.
(3) Adjust horizontal POSITION control to align 2d marker with center vertical
graticule line.
(4) Adjust DELAY TIME MULT dial to 2.0.
If 3rd marker is not within r3.7
divisions of center graticule line, perform b below.
(5) Adjust DELAY TIME MULT dial to 6.0. Set DLY TIME switch to 20 Ps; if 7th
marker is not within r3.3 divisions of center graticule line and b was not performed in (4)
above, perform b below.
(6) Adjust DELAY TIME MULT dial to 9.0. If 10th marker is not within r4.3
divisions of center graticule line and b was not performed in (4) or (5) above, perform b below.
b. Adjustments
(1) Adjust DELAY TIME MULT dial to 1.0.
(2) Pull DLY TIME switch to PULL FOR INTENS and adjust horizontal position
control to align one time marker per division. If intensified portion of sweep displayed on
oscilloscope does not start on 2d time marker, adjust R576 DLY'D START (fig. 4) so
intensified portion of sweep starts at 2d time marker.
(3) Adjust DELAY TIME MULTI dial to 9.0. If intensified portion of sweep does
not start on 10th time marker, adjust R572 DLY'D STOP (fig. 4) so intensified portion of
sweep starts at 10th time marker.
(4) Adjust DELAY TIME MULTI dial to 1.0 and push DLY TIME switch to
PUSH FOR DLY'D. If 2d time marker does not start at the beginning of delayed sweep,
adjust R576 DLY'D START (fig. 4) so 2d time marker starts at the beginning of delayed sweep (R).
(5) Adjust DELAY TIME MULTI dial to 9.0. If time marker does not start at the
beginning of delayed sweep, adjust R572 DLY'D STOP (fig. 4) so 10th time marker starts at
the beginning of delayed sweep (R).
NOTE
Interaction exists between adjustments R576 and R572.
Repeat b (4) and (5) above as necessary for best compromise.
(6) Repeat a (1) through (6).
23. Final Procedure
a. Deenergize and disconnect all equipment.
b. Annotate and affix DA label/form in accordance with TB 750-25.
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