trigger doesn't work under stream mode?

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Liu
Newbie
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Joined: Thu Jun 28, 2018 3:48 pm

trigger doesn't work under stream mode?

Post by Liu » Fri Jun 29, 2018 3:39 pm

Hi,

I just tested the Labview examples PicoScope6000ExampleStreaming.vi and PicoScope6000ExampleRapidBlockBulk.vi. Both work well with my Pico6404D without trigger. But stream mode doesn't work with any trigger settings I tried. Is that normal?

The rapid block works well with the trigger. But is it possible to set the buffer? I asked for 10K samples and 10 K captures, and it already told me not enough memory.

Also I am curious how fast I use the trigger? I need 20K triggers per second and collect 500 samples at 100 MHz sampling rate after per trigger. Is that possible to do under rapid block mode.

Thanks in advance!

Liu

AndrewA
PICO STAFF
PICO STAFF
Posts: 215
Joined: Tue Oct 21, 2014 3:07 pm

Re: trigger doesn't work under stream mode?

Post by AndrewA » Mon Jul 02, 2018 3:26 pm

Hi Liu,

What version of LabVIEW are you using 32 or 64 bit?

Do you want to stream samples from the unit? Streaming mode means with no gaps
With three channels that's only 39MHz sample rate. (156MS/s max for USB 3 divided 4 channels)
Or
Run the unit in rapid block mode with triggering?
500 samples at 100MHz (10ns) = 5us, multiplied by 20k blocks is 100ms,
plus +1us gaps per triggered block.(+20ms) ?

Rearm time is Less than 1 µs on fastest timebase, or at sample internal if less than 1us.
As for the timebase the 100MHz is not a selectable sample rate. A timebase number of 1567 is the closest at 99.968MHz.

Regards Andrew Abbott
Technical Specialist
Regards Andrew
Technical Specialist

Liu
Newbie
Posts: 0
Joined: Thu Jun 28, 2018 3:48 pm

Re: trigger doesn't work under stream mode?

Post by Liu » Mon Jul 02, 2018 3:59 pm

Hi Andrew,

Thanks for your reply.

I am using 32 bit LabVIEW 2014. Is that a problem?

I need 20k triggers per second, so the time interval between triggers is 50 us. Excluding 5 us sampling for 500 samples, there is still 45 us left for rearm. Is that not enough?

I understand 100 MHz per channel is not selectable. I can use 78MHz, I geuss that is timebase 6, right?

Kind regards,
Ping

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