238 6000 Series Oscilloscope User’s Guide
5 Making Measurements
Frequency
Frequency is defined as 1/Period. Period is defined as the
time between the middle threshold crossings 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.
To isolate an event for frequency measurement The following
figure shows how to use delayed sweep to isolate an event
for a frequency measurement. If the measurement is not
possible in the delayed time base mode, then the main time
base is used. If the waveform is clipped, it may not be
possible to make the measurement.
Table 15 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
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