## Simultaneous Sampling

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butterw
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Joined: Mon Mar 08, 2010 10:26 am

### Simultaneous Sampling

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) ?

Erik
PICO STAFF
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Joined: Mon Oct 23, 2006 8:16 am
Location: Cambridgeshire, UK

### Re: Simultaneous Sampling

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.

butterw
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### Re: Simultaneous Sampling

thanks.

Could you provide an answer for the 4 channel use case ?

Erik
PICO STAFF
Posts: 53
Joined: Mon Oct 23, 2006 8:16 am
Location: Cambridgeshire, UK

### Re: Simultaneous Sampling

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.

rslesinger
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Joined: Wed Mar 30, 2016 8:09 am

### Re: Simultaneous Sampling

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)?

Martyn
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Joined: Fri Jun 10, 2011 8:15 am
Location: St. Neots

### Re: Simultaneous Sampling

For those devices the sampling is simultaneous, no delays.
Martyn
Technical Support Manager

RAF96
Newbie
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Joined: Fri Dec 02, 2016 9:11 pm

### Re: Simultaneous Sampling

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.
Rob

Erik
PICO STAFF
Posts: 53
Joined: Mon Oct 23, 2006 8:16 am
Location: Cambridgeshire, UK

### Re: Simultaneous Sampling

The only devices we sell that do not sample simultaneously on all channels are the PicoScope 3425 (Differential input oscilloscope) and the 4424 in some modes.

Discontinued devices which have sequential or interleaved sampling in some modes are the 3224 and 3424.

[Edited by Admin as the 4424 is a current model]

gmud
Newbie
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Joined: Wed Jan 11, 2017 9:10 am

### Re: Simultaneous Sampling

Just to check your last statement, can you confirm that all 8 channels of the 4824 sample simultaneously ?

Martyn