Simultaneous Sampling

Post any questions you may have about our current range of oscilloscopes
Post Reply
butterw
Newbie
Posts: 0
Joined: Mon Mar 08, 2010 10:26 am

Simultaneous Sampling

Post by 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) ?

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

Re: Simultaneous Sampling

Post by 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.

butterw
Newbie
Posts: 0
Joined: Mon Mar 08, 2010 10:26 am

Re: Simultaneous Sampling

Post by butterw » Fri Mar 26, 2010 11:34 am

thanks.

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

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

Re: Simultaneous Sampling

Post by 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.

rslesinger
Newbie
Posts: 0
Joined: Wed Mar 30, 2016 8:09 am

Re: Simultaneous Sampling

Post by 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)?

Martyn
Site Admin
Site Admin
Posts: 3345
Joined: Fri Jun 10, 2011 8:15 am
Location: St. Neots

Re: Simultaneous Sampling

Post by Martyn » Wed Mar 30, 2016 10:17 am

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

RAF96
Newbie
Posts: 1
Joined: Fri Dec 02, 2016 9:11 pm

Re: Simultaneous Sampling

Post by 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.
Rob

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

Re: Simultaneous Sampling

Post by Erik » Mon Dec 05, 2016 7:59 am

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
Posts: 0
Joined: Wed Jan 11, 2017 9:10 am

Re: Simultaneous Sampling

Post by gmud » Wed Jan 11, 2017 9:17 am

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

Martyn
Site Admin
Site Admin
Posts: 3345
Joined: Fri Jun 10, 2011 8:15 am
Location: St. Neots

Re: Simultaneous Sampling

Post by Martyn » Wed Jan 11, 2017 10:24 am

That is correct .
Martyn
Technical Support Manager

Post Reply