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Maintenance and Calibration — Type 114
Fig. 4-18
Crt display of pulse aberrations.
h. Using the HORIZONTAL PO ITION and VERNIER con
trols, position the leading edge of the pulse to the center of
the graticule.
i.
Turn the
WEEP MAGNIFIER to X 10 .
equivalent time/cm of 10 nanoseconds.
j.
Measure the rise ti me between the 10% and 90% points
on the waveform (see Fig. 4 19).
k. Using the HORIZONTAL PO ITION and VERNIER con
trols, position the trailing edge of the pulse to the center of
the graticule and measure the falltime .
4-12
I.
et the AMPLITUDE switch to — 3 to 10 V and repeat
h, i, i, and k.
This gives an
The risetime or falltime of the Type 114 as read
on the crt of the Type 547 will be less than 13
nanoseconds. The 50 megacycle bandpass of the
Type 547 / 1 A1 adds about 25% to the actual rise
and fall times of the Type 114.
risetime and f a lltime should be checked with a
sampling oscilloscope system if one is available.
NOTE
For this reason,
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