Agilent Technologies InfiniiVision 5000 Series User Manual page 201

6
Measurements and Math Functions
I F
SOLATING AN EVENT FOR REQUENCY 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.
Fall Time
The fall time of a signal is the time difference between the crossing of the upper
threshold and the crossing of the lower threshold for a negative-going edge. The X cursor
shows the edge being measured. For maximum measurement accuracy, set the sweep
speed as fast as possible while leaving the complete falling edge of the waveform on the
display. The Y cursors show the lower and upper threshold points.
Rise Time
The rise time of a signal is the time difference between the crossing of the lower
threshold and the crossing of the upper threshold for a positive-going edge. The X cursor
shows the edge being measured. For maximum measurement accuracy, set the sweep
speed as fast as possible while leaving the complete rising edge of the waveform on the
display. The Y cursors show the lower and upper threshold points.
InfiniiVision Oscilloscopes User's Guide 201