Tektronix CSA7154, Руководство пользователя, Страница: 239 / 480

Measuring Waveforms
CSA7000 Series, TDS7000 Series, & TDS6000 Series Instruments User Manual
3- 161
You can measure time or amplitude or both. Vertical cursors measure time or
distance on screen, horizontal cursors measure voltage or amplitude, and
waveform and screen cursors measure both. Table 3--9 expands on these
definitions.
Table 3- 9: Cursor functions (types)
Cursor function Parameter measured Cursor readout
Horizontal cursors
Horizontal cursors measure amplitude (volts, watts). Each cursor
measures with respect to:
H
V1 = Level @ Cursor 1 with respect to its source ground level
H
V2 = Level @ Cursor 2 with respect to its source ground level
H ∆
V = Level @ Cursor 2 -- Level at Cursor 1
Level is cursor displacement from the source ground times the
source volts/div. Note that the two cursors may have different
sources and therefore can have different volts/div settings.
Vertical cursors
T
Vertical cursors measure distance (time in seconds or bits). Each
cursor measures with respect to:
H
T1 = Time @ Cursor 1 with respect to the trigger point
H
T2 = Time @ Cursor 2 with respect to the trigger point
H ∆
T = Time @ Cursor 2 -- Time @ Cursor 1
Time is divisions of displacement of the cursor from its source trigger
point times the source time/div.
Waveform (and Screen) cursors
T
Waveform cursors measure both voltage and time. Each cursor is,
in effect, both a vertical and horizontal cursor. You can select the style
of the cursors. These waveform cursors cannot be moved off the
waveform.
Note that Screen cursors are the same as waveform cursors except
that the cursors can be moved off the waveform.
Cursors can measure channel, reference, and math waveforms. You must set the
source of each cursor explicitly in the Cursor Setup control window.
Cursors are not available with histograms, XY, or XYZ modes.