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Incorrect acquisition rate in signal express

Hi,

 

We are trying to use signal express 2011 (v5.0.0)  with a NI 9188 couple of NI 9213 thermocouple modules. At the moment we are just trying to perform a calibration of the channels using a calibrated source to simulate thermocouple inputs.

To help us do this I have written a signal express project to log data once a second, using continuous logging at 1Hz and fetching one sample at a time. I could have used sample on demand but I'm under the impresion this sets the module up afresh every time the sample is demanded (please correct me if I'm wrong here).

Having set up for 1 sample a second I'm suprised to find that the log file lists dt as 909.091 ms.

Can anyone explain why this should be?

Thanks.

Regards,

 

Bandit

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Hi Bandit,

 

Could you upload your Signal Express project that you created? Also if you have access to LabVIEW have you used it to collect data from your thermocouples instead? If so did you see the same problem?

 

Best regards,

 

James

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