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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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Re: Simultaneous Sampling

Postby RAF96 » Fri Dec 02, 2016 10:26 pm

I want to compare channel A with channels B and C which should be simultaneous in phase else I am unable to prove what I set out to do.
Is a 2408B four channel device able to show simulataneousness (if thats a word) of these channels.
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Re: Simultaneous Sampling

Postby Erik » Mon Dec 05, 2016 7:59 am

The only current device we sell that does not sample simultaneously on all channels is the PicoScope 3425 (Differential input oscilloscope).

Discontinued devices which has sequential or interleaved sampling in some modes include 4424, 3224, 3424.
The two channel 4224 in the same range sample simultaneously in all modes.
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