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Measuring Waveforms
CSA8000B & TDS8000B User Manual
3-85
Taking Cursor Measurements
Use cursors to measure amplitude and time quickly and with more accuracy than
when using graticule measurements. Because you position cursors wherever you
want on the waveform, they are easier to localize to a waveform segment or
feature than automatic measurements.
Time or amplitude or both. Vertical cursors measure time or bits on screen;
horizontal cursors measure amplitude: voltage, watts, rho, or ohms; and
waveform cursors measure both. Table 3--6 expands on these definitions.
Table 3- 6: Cursor functions (t ypes)
Cursor function Parameter measured Cursor readout
Horizontal cursors
Horizontal cursors measure amplitude (volts, watts). Each cursor
measures with respect t o:
H v1 = Level at Cursor 1 with respect to its source ground level
H v2 = Level at Cursor 2 with respect to its source ground level
H ∆v = Level at Cursor 2 -- Level at Cursor 1
Level is cursor displ acement from t he source ground ti mes t he
source volts/div. Note t hat the t wo cursors m ay have different
sources and therefore can have different volts/div settings.
Vertical cursors
Trigger point
Vertical cursors measure distance (time in seconds or bits). Each
cursor measures with respect to:
H t1 = Time at Cursor 1 with respect to the trigger point
H t2 = Time at Cursor 2 with respect to the trigger point
H ∆t = Time at Cursor 2 -- Time at Cursor 1
H 1/∆t = 1/(Time at Cursor 2 -- Time at Cursor 1)
Timeisdivisionsof displacement of thecursorfrom its sourcetrigger
point times t he source t ime/div. Note that the two cursors may have
different sources and,therefore, can havedifferent time base(Main,
Mag1, Mag2) settings.
Waveform cursors
Trigger point
Waveform cursors measure bot h volt age and t ime. Each cursor is,
in effect, botha vertical andhorizontal cursor. Neitherof thesepaired
cursors can be m oved off the waveform.
Note that sources can have different volts/div settings.
Why Use?
What’s Measured?