Reduce the Number of Data Points

[Aslan FRP]

I am trying to collect strain measurements and the software is logging tens of thousands of points per minute.  I have tried changing the sampling frequency on the timing settings on the configuration tab.  This is only moderately useful and still does not cut down the sample size to workable amounts.  I am using a NI 9237 data aquisition system.  How can I change it so I am only taking/recording samples at a couple of hertz rather than kilohertz?

[Now_With_Underscores]

Hey Aslan,

The 9237 has a finite number of sampling rates available, with a minimum sampling rate of 2000S/s.  This is due to the sample clock downconverter, which can only output integer divisors of the master clock.  The 9237 is a DSA device and uses a delta sigma adc converter, which is geared to measure sound and vibration applications,so sampling at just a few samples per second is not what it is geared towards.  Even if you set the sampling rate to 4 samples per second (for example), the hardware sample rate will coerce to the next closest value, which for all values below 2000 S/s will be 2000 S/s.  One workaround is to take a few out of the 2000 samples obtained each second and write them to your file.  To physically slow your sample rate, you will need a different C series module.  Depending on your application, the 9215A might be a great fit to acquire at slower rates.