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KV31 ADC Sample Rate with Hardware Averaging

Question asked by Shawn Mason on Oct 17, 2016
Latest reply on Oct 22, 2016 by Shawn Mason

I'm using the PIT to hardware trigger the ADC module.  I was able to successfully capture a 1 kHz test signal at a 100 kSPS rate.  I then implemented hardware averaging.  I expected the sample rate to drop to the base sample rate divided by the number of averages (i.e. 100 kSPS / 4 avg. = 25 kSPS).  Instead it dropped by a factor of 3 (33.33 kSPS).  I found the other settings resulted in sample rates that were (3/4 * number of avg's).  So an average of 8 resulted in a sample rate reduction of 6.  Has anyone else confirmed this?  Is the intended behavior?

 

No Averaging - 100 kSPS Assumed Sample Rate, 1 kHz Test Signal

Time Domain No Avg

Frequency Domain No Avg

Averaging of 4 - 25 kSPS Assumed Sample Rate, 1 kHz Test Signal

Time Domain 4 Avg

Frequency Domain 4 Avg

Averaging of 4 - 33.33 kSPS Assumed Sample Rate, 1 kHz Test Signal

Time Domain 4 Avg 33

Frequency Domain 4 Avg 33

 

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