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Reference Levels Method
A second set of levels affect the fidelity of time-related measurements. For example, the
measurement system calculates rise time from the waveform edge that transitions from the Low to
the High reference levels.
The instrument provides the following calculation methods (see the following figure):
 Relative Reference is calculated as a percentage of the High/Low range.
 Absolute Reference is set by absolute values in user units.
Cursor Measurements
Because cursor measurements give immediate feedback on the amplitude or time values they
measure, they are usually quick to take and are more accurate than graticule measurements. Also,
since you can position cursors wherever you want them on the waveform, they are easier to
localize to a waveform segment or feature than automatic measurements.
Cursors can measure channel, reference, and math waveforms. You must set the source of each
cursor explicitly in the Cursor Setup control window.
Any cursor type can be used for YT display format. XY and XYZ display format can only use
Screen or Waveform cursors. If FastAcq is on, XYZ display format can only use Screen cursors.
To use cursors, simply move the cursors on screen and read the results in the cursor readouts. The
following key points will help you use the cursors effectively.
Cursor Types
There are two cursors displayed for all types, Cursor 1 and Cursor 2. You can move cursors with
the multipurpose knobs or the cursor position controls in the Cursor Setup control window, or
click and drag them to a new location.
Cursors are Limited by the Display
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