VT DSO-2A20 Manual Rev. 1.1
Virtins Technology
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Selecting “Record” in the Sweep Time combo box (at the bottom left corner of the
screen after clicking anywhere in the oscilloscope window) and then clicking the Run
button of the oscilloscope (at the upper left corner of the screen).
Click the Record button or oscilloscope Run button again to stop recording. When the
sampling frequency is high, the hard disk file used for recording will be filled up very
quickly, remember to click either of the above buttons to stop recording in time. To exit the
Record Mode, select an oscilloscope sweep time other than “Record” in the above Sweep
Time combo box.
Under Record Mode, raw ADC data will be written into the hard disk continuously in WAV
file format. Meanwhile, data analysis and display will still be performed in order to keep the
screen updated in real time. Priority is given to the former process in order to try the best to
ensure uninterrupted data recording. Whether the recorded data are continuous (i.e. the
adjacent frames of data are connected smoothly without missing any data in between) or not
depends on the system throughput, sampling frequency, bit resolution, number of sampling
channels, etc. The DAQ progress bar under the oscilloscope graph shows the recording
progress. The progress bar will be filled with some red color if the recorded data are not
continuous (see figures below). You can lower the sampling frequency and bit resolution,
and use single channel if possible, to get continuous data stream.
No discontinuity detected Discontinuity detected
During the recording process, the screen will still be updated. The oscilloscope frame width
can be adjusted via [Setting]>[Display]> “Record Mode”> “Frame Width” (in points).
When the recording process is stopped, the recorded file will be opened automatically. If it is
too big, it will be opened frame by frame. In this case, the Long Wave File Navigation
Toolbar
(as shown below) will pop up to allow you to navigate through the file.
1.8.2.3 Roll Mode
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