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7.2 Sampling Mode
This oscilloscope only supports the real-time sampling mode. In this mode, the
oscilloscope produces the waveform display from samples collected during one
trigger event. The maximum real-time sample rate of this series is 4 GSa/s. The
current sample rate is displayed in the acquisition label at the top of the screen.
By default, the operating status label at the left top of the screen is illuminated in
green, indicating that the instrument is in real-time sampling, and the STOP/RUN
button on 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, and the STOP/RUN button turns red. Also, the backlight of the front-
panel key 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 digital data 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:
Acquisition System
DHO4000 User Guide
62
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
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