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click Setup Ref Levs to open the Reference Levels setup
control window.
14. To set how the instrument determines the base and top of
the waveform, click Determine Base, Top From:
• Min-Max to use the highest and lowest values of the
waveform record. (See Automatic Measurements on
page 256 High/Low Method for more information.)
• Histogram to select the most common values above or
below the midpoint. (See Automatic Measurements on
page 256 High/Low Method for more information.)
15. To select the reference level units, click Units:
• Absolute to set the units to absolute values in user units.
• Percentage to set the units as a percentage of the
High/Low range.
16. To set the reference levels, click on these controls and use
the multipurpose knob or pop-up keypad to set:
• High Ref to define the high reference level. The default
level is 90%.
• Mid Ref to define the middle reference level. The
default level is 50%.
• Low Ref to define the low reference level. The default
level is 10%.
• Mid2 Ref to define the middle reference used on the
second waveform specified in delay or phase
measurements; the default level is 50%.
Take a snapshot of
measurements
17. Select the Snapshot command from the Measure menu, or
open the Measurement Setup control window and click
Snapshot on any tab. A window showing all single
waveform measurements opens.
Snapshot measurements are taken on the selected waveform. The
Snapshot window tells you the channel that the measurements are
being taken on and the reference levels used.
18. Snapshot measurements are not continuously updated. To
update snapshot measurements, click Snapshot Again.
Phase, Delay, and Histogram measurements are not included in a
snapshot.
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