acquire 2 signals with different sampling rate?

[markus_umd]

Hello,

i am using first time labview signal express together with a NI pci 6251 & NI Scc 68 device.

There are 2 signals I wish to acquire over a 2 week time period. They should be saved in several tdms files. One is a dc Voltage.(sampling rate 100Hz) The second is voltage given by an acceleration Sensor. (sampling rate 4kHz)

When I try to acquire them I couldn't figure out how to set the sampling rate for each signal, only for all signals.

When I created two DAQmx assistant acquire tabs. An error occurs always: "the specified resource is reserved".

So my question is is it possible to do this?

[RobertH]

hello markus_umd,

no, it is not possible to create different samplingrates for individual channels on one daq device.

if you want to record one channel slower, you must reduce the samples for that channel in your program.

if the channels have a common divisor, you could implement your task. you find more information here:
Sampling Different Channels at Different Rates with NI-DAQmx

kind regards,

robert h
NI germany