208 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
14 Measurements
• In the Type column, select:
• Percent — To set the measurement threshold as a % (percentage) of the
Top and Base values.
Percentage thresholds can be set from 0% to 100%.
• Absolute — To set the measurement threshold as an absolute value.
The units for absolute threshold for each channel is set in the channel
probe dialog box.
• In the Lower column, select the field and enter 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 Type is set to %, the lower threshold value can be set from 0% to
98%.
• In the Middle column, select the field and enter 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 Type is set to %, the middle threshold value can be set from 1%
to 99%.
• In the Upper column, select the field and enter the upper measurement
threshold value.
Decreasing the upper value below the set middle value will automatically
decrease the middle value to be less than the upper value. The default upper
threshold is 90% or 1.50 V.
If threshold Type is set to %, the upper threshold value can be set from 2% to
100%.
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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