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NI PXIe-4844 multi channel acquisition

Hello,

 

We have a PXIe-4844 FBG interrogator module in a NI PXIe-1073 chassis.

In the datasheet it is stated that the sample rate is 10Hz. I presume that this is for single channel acquiring. I need to sample 2 (later 4) channels simultaneously. I wrote some code and when I start the program, my sample rate falls to about 1 Hz, which is kind of slow for the application I need.

What is the sample rate when one uses 2 or more channels simultaneously?

 

Best regards,

Borut

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Hi Borut,

 

The NI PXIe-4844 is specified to have four optical channels that are simultaneously sampled at 10 Hz. Try out the Cont Acq&Graph - Import OSI Explorer Config example using two channels. It requires you to configure the sensors in OSI Explorer before running the data acquisition in LabVIEW.

What sample rate does it show?

Best regards,
Rares C.
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Dear Rares,

 

thank`s for your reply and shedding the light on our issue. In the end, the problem was in our code i.e. bad choice of VI block. After choosing the right one (a good example of implementation is provided with examples), we have 10 Hz sampling on all channels.

 

Best regards,

Borut 

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