Programming instructions

Chapter 9 Letting an Outside Source Control Your Acquisition Rate
LabVIEW Data Acquisition Basics Manual 9-4
© National Instruments Corporation
Figure 9-4 shows you the Acquire N Scans-ExtChanClk VI, located in
labview\examples\daq\anlogin\anlogin.llb
. This example
demonstrates how to set up your acquisition for an externally controlled
channel clock. The VI includes the AI Clock Config VI and the clock
source was connected to the I/O connector.
Figure 9-4.
Getting Started Analog Input Example VI
You can enable external conversions by calling the Advanced-level
AI Clock Config VI. Remember that the AI Clock Config VI, which is
called by the AI Config VI, normally sets internal channel delay
automatically or manually with the
interchannel delay
control. However,
calling the AI Clock Config VI after the AI Config VI resets the channel
clock so that it comes from an external source for external conversion.
Also, notice that the scan clock is set to 0 to disable it, allowing the channel
clock to control the acquisition rate.
Note
The 5102 devices do not support external channel clock pulses, because there is
no channel clock on the device.