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Simultaneous Sampling

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Simultaneous Sampling

Postby butterw » Tue Mar 09, 2010 9:06 pm

I am considering the purchase of a Picoscope 4424 and need some information about the time delay between measurements on 2 or 4 channels :
How simultaneous is the sampling on the different channels (for instance at 200KSa/s sampling rate) ?
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Re: Simultaneous Sampling

Postby Erik » Mon Mar 22, 2010 10:31 am

If you are using one out of A and B and/or one out of C and D the samples should be simultaneously. On the two channel product they are always simultaneously sampled.
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Re: Simultaneous Sampling

Postby butterw » Fri Mar 26, 2010 11:34 am

thanks.

Could you provide an answer for the 4 channel use case ?
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Re: Simultaneous Sampling

Postby Erik » Fri Mar 26, 2010 11:42 am

They will be out by half a sample period on the highest sampling rate when using 4 channels. The highest sampling rate is 20 MS/s when using 4 channels, this makes the period 50 ns. The samples on channel B and D will be out 25 ns compared to channel A and C. This is true even for the lower sampling rates, at 200 kS/s there will still only be 25 ns difference.
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Re: Simultaneous Sampling

Postby rslesinger » Wed Mar 30, 2016 9:00 am

Erik wrote:They will be out by half a sample period on the highest sampling rate when using 4 channels.


Hi, I would like to verify how this is true for Picoscope 3206D - do I expect right that there a defined fixed delay between the channels (1 ns in this case), and the same holds for 5200 series (in 8-bit mode)?
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Re: Simultaneous Sampling

Postby Martyn » Wed Mar 30, 2016 10:17 am

For those devices the sampling is simultaneous, no delays.
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