False events to scanner high speed?

Hi all:

We use NI5154 1 GHz digitizer to capture the pulse of a detector. We have seen several very narrow pulses with a width smaller than single 10ns. In general, it would be a surprise to see these fast pulses in our detector. And also the associated ability seems to determine a time constant around 100 ns coming from any detector of signal. Someone argued that these narrow pulses can be false events reported by scanner. It's really hard for me to picture how this could happen? Furthermore, I use method of analog edge trigger in the capture of pulse process. We really need to clarify this issue. Any ideas will be appreciated.

An example of these impulses of snarrow figure was attached.

-------------------------------------------------

P. S.

Men of the United Kingdom sent us it there but on our narrow pulses. Here's a copy of his text:

"My first thought is that this may be due the digitizer itself, which gives.

events of thugs as the pulse fall time high level discriminator?

I've seen similar effects, even at 20 average scope projects with impulses from "form". It's

almost as if the discriminator FPGA is 'perfect' and sometimes reports

another pulse or two immediately after a 'real' pulse »

LCHEN5154 wrote:

Thanks much for your thoughts, Henrik.

If I see shoutcut entry. I don't know that these fast pulses are not generated randomly by digitizer.

The question is can scanner report short false events after an authentic event?

What a preamplifier ORTEC VT120A was used to amplify the signal. We have seen these impulses even without the amplifier.

Thank you.

Lixin

The specification of the ORTEC say output impedance is less than 1 Ohm, since we are talking about less than 1ns rise time: how long is the cable between the preamp and converter? I keep on thinking of cable... somehow, I feel that the output must also match the cable impededance...

You have shortened at the entrance of the digitizer? How to see cable as a room of ion or an antenna?  You can try a termination 50 ohm or shorts instead of the preamp?

Looking at your signal: I see still two points within 5ns, how long is your cable? 5NS is equivalent to a 1.2 m cable 50 ohm...

Tags: NI Products

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