7.2 Sampling Mode
This oscilloscope only supports the real-time sampling mode. In this mode, the
oscilloscope produces the wav
eform display from samples collected during one
trigger event. The maximum real-time sample rate of this series is 2 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 t
oolbar is in green. Click or tap the
STOP/RUN button or pr
ess the
front-panel
key to stop sampling. At this time, the operating status label shows
"STOP" in r
ed, and the
STOP/RUN button tur
ns 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 wav
eforms 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 inter
val 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 tw
o-channel models (DHO1072, DHO1102, and DHO1202),
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
(DHO1074, DHO1104, and DHO1204), 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.
Acquisition System
DHO1000 User Guide
58
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