Measurement Setup; Making Measurements - HP 54501A Operation Reference

Measurement
Setup
Making
Measurements
Algorithms
One of the HP 5450lA's primary features is its ability to make automatic
measurements on displayed waveforms. This chapter provides details on
how automatic measurements are calculated and some tips on how to
improve results.
Measurements typically should be made at the fastest possible sweep
speed for the most accurate measurement results. The entire portion of
the waveform that is to be measured must be displayed on the
oscilloscope. That is:
•
at least one complete cycle must be displayed for period or freqnency
measurements
•
the entire pulse must be displayed for width measurements
•
the leading edge of the waveform must be displayed for risetime
measurements
•
the trailing edge of the waveform must be displayed for falltime
measurements
If more than one waveform, edge, or pulse is displayed, the measurements
are made on the first (Ieftmost) portion of the displayed waveform that
can be used. If there are not enough data points the oscilloscope will
display :;:; with the measurement results. This is to remind you that the
results may not be as accurate as possible. It is recommended that you
re-scale the displayed waveform and make your measurement again.
A
Algorithms
A-1