User`s guide

Measurements and Math Functions 6
InfiniiVision Oscilloscopes User’s Guide 197
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 Type 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.
Increasing the lower value beyond the set middle value will automatically increase the
middle value to be more than the lower value. The default lower threshold is 10% or
800 mV.
If threshold Typ e is set to %, the lower threshold value can be set from 5% to 93%.
5 Press the Middle softkey, then turn the Entry knob to set the middle measurement
threshold value.
The middle value is bounded by the values set for lower and upper thresholds. The
default middle threshold is 50% or 1.20 V.
• If threshold Ty pe is set to %, the middle threshold value can be set from 6% to 94%.
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.