Tektronix TDS5054, Руководство пользователя

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Acquiring Waveforms
3- 22
TDS5000 Series User Manual
H
Average: The oscilloscope processes the number of waveforms you specify
into the acquired waveform, creating a running average of the input signal.
This mode reduces random noise.
Acquiring and displaying a noisy square wave signal illustrates the difference
between the modes. Note how Average mode reduces the noise while Envelope
mode captures its extremes:
Sample
Envelope
Average Peak Detect Hi Res
You have two main options for controlling acquisitions. To access these options,
use the front-panel buttons or select Run/Stop from the Horiz/Acq menu.
H
RUN/STOP button: Click this button to set the oscilloscope to start and stop
an acquisition only when you push the Run/Stop button in this window or
RUN/STOP on the front panel. If toggled to Run, acquisition will start if a
valid trigger occurs. If toggled to Stop, acquisition stops immediately. Single
Sequence is not affected.
H
Single Sequence button: Click this button (or press the SINGLE front-panel
button) to set the oscilloscope to automatically stop acquisition when one
complete acquisition sequence is completed. Refer to step 4,
Set the Stop
mode, on page 3--26 for more information.
Global Controls.
Like the horizontal controls, the acquisition controls apply to all
active channels; for example, channel 1 cannot acquire in Sample mode while
channel 2 acquires in Envelope mode. You cannot stop channel 4 from acquiring
(if turned on) while other channels continue to acquire.
Roll mode gives a display similar to a strip chart recorder for low frequency
signals. Roll mode lets you see acquired data points without waiting for the
acquisition of a complete waveform record. For example, in normal acquisition
mode, if the horizontal scale is 1 second per division, 10 seconds are required to
fill the waveform record. Without roll mode you must wait 10 seconds before the
waveform appears. With roll mode, you can see results almost immediately.
Untriggered Roll Mode. Untriggered roll mode displays newly acquired data
points at the right edge of the waveform record while moving older waveform
Controlling Acquisitions
Roll Mode