Sample Rate - Rigol HDO1000 Series User Manual

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 instrument model and the
current channel mode. For two-channel models (HDO1072, HDO1102, and HDO1202),
the oscilloscope provides up to 2 GSa/s real-time sample rate in single channel mode
and 1 GSa/s real-time sample rate in all channels mode. For four-channel models
(HDO1074, HDO1104, and HDO1204), the oscilloscope provides up to 2 GSa/s real-
time sample rate in single channel mode, 1 GSa/s real-time sample rate in half
channels mode, and 500 MSa/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: For four-channel models, if two of the channels are
enabled, it is called half channels mode.
• All channels mode: For two-channels models, if all two channels are enabled, it
is called all channels mode; for four-channel models, 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.
HDO1000 User Guide
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