238 Agilent InfiniiVision 3000 X-Series Oscilloscopes User's Guide
14 Measurements
Each analog channel and the math waveform can be assigned unique
threshold values.
3 Press the Ty pe 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 Ty pe 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 Type 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%.
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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