25 |
memory is filled up, resulting in discontinuous data.
Limited number acquisition mode
Limited number acquisition mode (OneShot mode) refers to one-time acquisition to get the set
number of collection points at the set sampling speed.
In OneShot mode, after the AI acquisition triggers, the acquisition
device
automatically starts
the acquisition and stops it after the acquisition reaches the set number of times on the set
sampling speed. The user program only needs to read the set data amount from the computer
memory buffer.
Attention
The set number of collection points cannot exceed 2MPts
.
3.6.
Comprehensive sampling rate and single channel
sampling rate
When the USB-3200 series data acquisition
device
is used for single channel acquisition, the
channel can achieve the maximum sampling rate.
If two channels are enabled for one acquisition, the sample rate for each channel is half the set
sample rate; if three channels are enabled, the sample rate for each channel is one third of the set
sample rate. When you have more channels, the calculation method is like this.
3.7.
AI sampling clock
The USB-3200 series data acquisition
device
has a rich collection timing option. The
schematic diagram of the AI sampling clock is shown in Figure 3.9.
AI timer
DI timer
DO timer
Conv_IN external sampling clock source
AI sampling clock
Figure 3.9 AI sampling clock options