182 Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide
13 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.
See Also • "To isolate an event for frequency measurement" on page 182
To isolate an event for frequency measurement
The following figure shows how to use Zoom mode to isolate an event for
a frequency measurement.
You may need to change the measurement window setting so that the
measurement is made in the lower, Zoom window. See "Measurement
Window with Zoom Display" on page 188.
If the waveform is clipped, it may not be possible to make the
measurement.
Figure 35 Isolating an event for Frequency measurement
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