Measure
3–34
TDS3000 Series User Manual
Bottom DescriptionSide
R
f
n
L
s
Set Levels in %
or units
Use to choose custom reference
levels in relative or absolute units.
High Reference Sets custom high reference level.
Mid Reference Sets custom mid reference level.
Low Reference Sets custom low reference level.
Set to Defaults Sets reference levels to default values.
Key Points
Choosing Measurements. You can perform up to four automatic
measurements and display them along the right side of the graticule.
All four measurements can apply to a single channel or you can
spread the measurements over several channels. You can also take
measurements on math and reference waveforms.
First push a channel, MATH, or REF button to select the waveform
you want to measure and then select a measurement. The table
beginning on page 3–37 describes the measurements in detail.
Measurement Interaction with Preview. If you change a vertical or
horizontal control setting while acquisition is stopped or is waiting
for trigger, measurements track the changes and remain valid.
Taking Gray-Scale Measurements. Using cursors is often the best way to
take simple measurements on waveforms that contain significant
gray-scale information. The automatic measurements operate only
on the latest acquisition, not on the previous acquisitions that are
displayed in gray scale. However, you can set the cursors to surround
and measure the gray-scale area of the waveform.
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