Oscilloscopes User's Guide

Making Measurements 5
6000 Series Oscilloscope User’s Guide 245
through the lower and upper threshold levels which eliminates
runt pulses. The X cursors show what portion of the waveform
is being measured. The Y cursor shows the middle threshold
point.
To isolate an event for frequency measurement The following
figure shows how to use zoom sweep to isolate an event for a
frequency measurement. If the measurement is not possible in
the zoom mode, then the main time base is used. If the
waveform is clipped, it may not be possible to make the
measurement.
Table 1 5 Isolating event for Frequency measurement
Period
Period is the time period of the complete waveform cycle. The
time is measured between the middle threshold points of two
consecutive, like-polarity edges. A middle threshold crossing
must also travel through the lower and upper threshold levels
which eliminates runt pulses. The X cursors show what portion
of the waveform is being measured. The Y cursor shows the
middle threshold point.