Agilent Technologies DSO-X 4022A, User Manual

Page: 256 / 488

256 Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide
14
Measurements
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.
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 256
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" on page 267.
If the waveform is clipped, it may not be possible to make the
measurement.