Performance Check—455/A2/B2
d. Disconnect test oscilloscope.
26. CHOPPED MODE REP RATE
a. Set VERT MODE to CHOP and set A LEVEL for
stable display.
b. CHECK—About 1 complete square-wave cycle/2
divisions.
27. CALIBRATOR OUTPUT
a. Set: CH 1 VOLTS/DIV .1 V
ATIM E /D IV .5 ms
b. Connect CALIBRATOR output to CH 1 input.
c. CHECK—For square-wave display of 300 mV (3 div)
at approximately 1 kHz (1 full cycle/2 div).
NOTE
Calibrator signal peak-to-peak amplitude
should be 300 m V within 1%. I f necessary
to check amplitude to this accuracy, refer
to the Adjustments section.
REV. A, OCT 1975
3-13
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