Sampling Rate Too Slow on 3rd Party DAQ Devices from Data Translation

Updated May 3, 2018

Reported In

Software

  • LabVIEW

Issue Details

I am using Data Translations' LV-Link 3 library with LabVIEW to read analog signals from a Data Translation DAQ card. However, when I using this I can only achieve a maximum sampling of 7 kHz per second (1 kHz per channel). I would like to set the sampling rate for 7 channels to 10 kHz each, giving a total of 70 kHz but this will take normally 7 seconds to read. My DAQ device is a DT9803 USB module.

Solution

This applies to all DAQ devices from Data Translation™ with multiplexing inputs: The Sampling Freq. (Hz) of the Set Input Timing needs to be set to the total sample frequency. That is:
Total sampling frequency = Sample Frequency per Channel x Number of Channels

In the case described above Sampling Freq. (Hz) needs to be set to 70000 to obtain a rate of 10 kHz on all seven channels

Additional Information

Excerpt from the help page of the DtOLTimingSetInput.vi:
"If your device has multiplexed analog input channels, you can determine the sampling frequency per channel as follows: Sample Frequency per Channel = Sample Freq (Hz)/Number of Channels." 

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