Measurements 14
Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide 197
• "Rise Time" on page 199
• "Fall Time" on page 200
• "Delay" on page 200
• "Phase" on page 201
• "X at Max Y" on page 202
• "X at Min Y" on page 203
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 markers show what portion of the
waveform is being measured. The Y marker 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 markers show what portion of the waveform is being
measured. The Y marker shows the middle threshold point.
See Also •
"To isolate an event for frequency measurement" on page 197
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 209.
If the waveform is clipped, it may not be possible to make the measurement.
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