Calibration—434
h. ADJU ST—If the lim its of the CHECK— step are not
met set the TRIGGER SOURCE to CH 1, TRIGGER
COUPLING to AC, and the T IM E /D IV to .2 ms. Adjust the
TRIGGER LE VEL control for a stable display and adjust
Calibrator Frequency adjustment R904 (see Fig. 5-13) for
minimum d rift of the tim e marks across the calibrator
waveform. Recheck repetition rate accuracy in the manner
given in steps a through g.
i. Disconnect all test equipment.
This completes the calibration procedure for the 434
Oscilloscope. Replace the instrument wrap-around cabinet.
If the instrument has been completely checked and
adjusted to the tolerances given in this procedure, it w ill
meet or exceed the specifications given in Section 1.
5-28
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