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Acquisition System
By default, the operating status label at the left top of the screen is illminated green,
indicating that the instrument is in real-time sampling, and the STOP/RUN button in
the toolbar is in green. Click or tap the STOP/RUN button or press the front-panel
key to stop sampling. At this time, the operating status label shows "STOP" in
red, the STOP/RUN button turns red. Also, the backlight of the front-panel
turns red. The oscilloscope will maintain its last captured graph. You can still pan or
zoom the waveforms by using the horizontal/vertical controls.
7.3
Sample Rate
Sampling is the process of converting an analog signal into the digital signal at a
specified time interval and then storing them sequentially in acquisition memory. The
sample rate is the reciprocal of the time interval.
In Horizontal menu, the "SaRate" item shows the current sample rate. The current
sample rate is also indicated in the acquisition label ("A" icon) at the top of the
screen, as shown in the figure below.
The sample rate of the analog channel is related to the current channel mode. This
series oscilloscope provides up to 4 GSa/s real-time sample rate in single channel
mode, 2 GSa/s real-time sample rate in half channels mode, and 1 GSa/s real-time
sample rate in all channels mode.
•
Single channel mode: If any one of the channels is enabled, it is called single
channel mode.
•
Half channels mode: If two of the channels are enabled, it is called half channels
mode.
•
All channels mode: If any three channels or all four channels are enabled, it is
called all channels mode.
A sample rate that is too low might have the following effects on the waveform:
•
Waveform Distortion: When the sample rate is too low, some waveform details
are lost, and the sample waveform displayed is rather different from the actual
waveform of the signal.
HDO4000 User Guide
62
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
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