Counter/Timer

cancel
Showing results for 
Search instead for 
Did you mean: 

PCI6034E with BNC-2110 trigger voltage

Solved!
Go to solution

Hi,

 

I am working on using the PCI-6034E with BNC-2110 to count the number of pulses within a given period of time. the input pulse has 5V amplitude and ~20ns width. However, for each pulse, there were some tail signals with around 1V amplitude. Will the till signals also be counted? If yes, is it possible to set the trigger voltage of the counter? Any help will be greatly appreciated.

 

Thanks,

0 Kudos
Message 1 of 8
(240 Views)

The counters on a 6034E will need a TTL-compatible pulse.  1 V amplitude isn't likely to register as high.  The specs say 0.0-0.8 is low, 2.0-5.0 is high.  Anything in between is unknown.

 

No, digital trigger voltages aren't settable.  This remains true for newer multifunction board families such as M-series and X-series.

 

 

-Kevin P

0 Kudos
Message 2 of 8
(211 Views)

Ideal hysteresis would that once signal crosses VIH it'll be registered as high until it crosses VIL.

 

This means, the rising edge is considered only if the signal crosses VIH 2.0V and it stays at high until it goes below VIL 0.8V.

 

If this is the case, your 1V tail will not register as another edge.

 

-Santhosh
Semiconductor Validation & Production Test
Soliton Technologies
Message 3 of 8
(202 Views)

Hi Santhosh,

 

Thank you so much for the help. I just used a pulse generator to test it. And you are mostly correct. The threshold voltage of input high seems to be 1.7V on my board.

 

Actually, I am using the board to count signals from an SPCM-AQRH detector, which a signal photon detector. I used an oscilloscope and get the waveform of a pulse as shown below. There is a dip(-1V) after the main peak, and the difference between the dip and the tail signal is around 2V. I am not sure if the difference leads to a new count?

 

Thanks again!
Capture.PNG

0 Kudos
Message 4 of 8
(178 Views)

My electronics knowledge is pretty limited, but I think you might want to clean up that analog-looking pulse and make it look more digital before sending it to a 6034E counter.  Something like a Schmitt trigger comes to mind.

 

 

-Kevin P

0 Kudos
Message 5 of 8
(174 Views)
Solution
Accepted by topic author Enbo

This waveform is helpful and new information is that you have a -ve dip which is of concern to me and may damage the instrument.

 

The 1V peak in the tail should not register as High as the signal needs to cross VIH to register as HIGH. I would recommend using a diode across the signal (reverse biased) to clamp the negative segment.

 

santo_13_0-1620920084139.png

 

-Santhosh
Semiconductor Validation & Production Test
Soliton Technologies
Message 6 of 8
(173 Views)

Thank you very much for your help!

0 Kudos
Message 7 of 8
(169 Views)

Thank you! I will give it a try.

0 Kudos
Message 8 of 8
(168 Views)