Pico Technical Support and Discussion Forum

Guest · Posted: Mon Apr 23, 2007 2:47 pm Post subject: adc11

the quoted speed of the adc11 is 20ks/s however i can't get it to run this fast. when you look at the actual sample interval it is always longer.

can someone post some settings which will let me collect at this fastest speed?

ziko · Posted: Mon Apr 23, 2007 3:09 pm Post subject:

Hi and thank you for your post.

This depends on the mode of the ADC11, in order to get 20kS/s you need to choose fast block mode in PicoLog.

Hope this helps.

Guest · Posted: Wed Apr 25, 2007 11:53 am Post subject:

Thanks Ziko

I was already already using fast block mode. If the adc11 is a 20ks/s unit then using one channel you should be able to get a 50us sample interval if it runs full speed. I can only get intervals in the range of ms.

any thoughts?

ziko · Posted: Wed Apr 25, 2007 1:24 pm Post subject:

Hi,

What you would need to is the following:

1) Ensure 1 channels is being used
2) Choose the number of samples to be say 20000 samples (20,000)
3) Choose the total time to be 1000000 us (1,000,000)

This will give you 50us intervals, I think you may have chosen the wrong number of samples or time.

Hope this helps.

Kind regards

Guest · Posted: Tue May 01, 2007 10:06 am Post subject: ADC11/12

using the ADC 11/12, in block mode, what is the maximum number of samples (or maximum sample time) one can set it to if you want to sample at 10 or 20kHz? thanks.

Guest · Posted: Tue May 01, 2007 10:08 am Post subject: ADC11/12 PS

PS. I meant with just 1 channel. thanks.

ziko · Posted: Tue May 01, 2007 3:06 pm Post subject:

Hi,

PicoLog will give you the best result with the given values you have chosen. There are two radio buttons:

a) "Total time stays constant"

-The time will remain very similar and the number of
samples will be compromised

b) "Number of samples stays constant"
-The number of samples will remain very similar
and the time will be compromised

If you change the numbers PicoLog will let you know if it is possible or not. For example if you wanted 20kS/s for 1 second then you can do as the then PicoLog will allow this as shown on the image attached.

Let me know how you get on.

Kind regards

ziko · Posted: Wed May 02, 2007 3:41 pm Post subject:

Hi, one thing I forgot to mention.

The quoted 20kS/s is for the USB ADC11, however for the parallel ported ADC11 it is 15kS/s.

Kind regards

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Pico Technical Support and Discussion Forum