Measurements and Math Functions 6
InfiniiVision Oscilloscopes User’s Guide 197
Measurement Thresholds
Setting measurement thresholds defines the vertical levels where measurements will be
taken on an analog channel or math waveform.
1 From the Quick Meas Menu, press the Settings softkey, then press the Thresholds
softkey to set analog channel measurement thresholds.
2 Press the Source softkey to select the analog channel or math waveform source for
which you want to change measurement thresholds. Each analog channel and the
math waveform can be assigned unique threshold values.
3 Press the Typ e softkey to set the measurement threshold to % (percentage of Top and
Base value) or to Absolute (absolute value.)
• Percentage thresholds can be set from 5% to 95%.
• The units for absolute threshold for each channel is set in the channel probe menu.
• When the Source is set to Math: f(t), the threshold Type can only be set to
Percent.
4 Press the Lower softkey, then turn the Entry knob to set the lower measurement
threshold value.
Changing default thresholds may change measurement results
The default lower, middle, and upper threshold values are 10%, 50%, and 90% of the value
between Top and Base. Changing these threshold definitions from the default values may change
the returned measurement results for Average, Delay, Duty Cycle, Fall Time, Frequency, Overshoot,
Period, Phase, Preshoot, Rise Time, +Width, and -Width.
Source
select
Threshold
Type
Lower
Threshold
Middle
Threshold
Upper
Threshold
Return to
previous menu
Absolute threshold hints
• Absolute thresholds are dependent on channel scaling, probe attenuation, and probe units.
Always set these values first before setting absolute thresholds.
• The minimum and maximum threshold values are limited to on-screen values.
• If any of the absolute threshold values are above or below the minimum or maximum waveform
values, the measurement may not be valid.
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