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Acquisition Modes
TDS 620A, 640A & 644A User Manual
3Ć7
H Press Single Acquisition Sequence (side). That selection lets you run a
single sequence of acquisitions by pressing the RUN/STOP button. In
Sample mode, the digitizing oscilloscope will acquire a waveform record
with the first valid trigger event and stop.
In Envelope or Average mode, the digitizing oscilloscope will make the
specified number of acquisitions to complete the averaging or envelopĆ
ing task.
Hint: To quickly select Single Acquisition Sequence without displaying
the Acquire and Stop After menus, press SHIFT FORCE TRIG. Now the
RUN/STOP button operates as just described. (You still must display the
Acquire menu and then the Stop After menu to leave Single Acquisition
Sequence operation.)
H Limit Test Condition Met (side) lets you acquire waveforms until waveĆ
form data exceeds the limits specified in the limit test. Then acquisition
stops. At that point, you can also specify other actions for the oscilloĆ
scope to take, using the selections available in the Limit Test Setup
main menu.
NOTE
In order for the digitizing oscilloscope to stop an acquisition when
limit test conditions have been met, limit testing must be turned
ON, using the Limit Test Setup main menu.
Setting up limit testing requires several more steps. You can create the
template waveform against which to compare incoming waveforms,
using the Create Limit Test Template main menu item. You can then
specify that the comparison is to be made, and the channel to compare
against the template, using the Limit Test Sources main menu item.
See Acquisition, on page 2Ć19.
See Limit Testing, on page 3Ć70.
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