How to count TTL pulse by DAQ through BNC 2090?

[opal]

I'm trying to count the TTL pulse from a APD by DAQ. There are some very nice discussions about this issue in this board. However, I am a novice and not sure about the hardware connection. The signal from APD is delievered out through a BNC cable and I'm trying to deliever this signal to DAQ through BNC 2090. I tried just simply connect the BNC cable to ACH0 and tried running the vi's, such as "Count_Edges.vi" and "Count_Events.vi". But I got no counts. I noticed that both these vis are actually reading signal from PFI port. That could explain why I got not counts.

So now the problem is how should I connect my signal in a BNC cable to the DAQ and have the counting working? Thank you for your help.

[AnalogKid2DigitalMan]

What model DAQ card is connected to the BNC2090? If it has counters on it, I would use those since that is the most straightforward approach. Then under LabVIEW Help, go to find examples and search on count. Look for a suitable example that mentions the DAQ card you have.

[opal]

Hi AnalogKid2DigitalMan,

Thanks for your reply. I'm using PCI-MIO-16XE-10 card. I'm a graduate student and this is my first time using DAQ technique. So would you please be more specific on how to connect the BNC cable from APD to PCI-MIO-16XE-10? Or do you know where can I find more information about that issue? Now I just simply connect the BNC to ACH0 port. Obviously, that shouldn't work.

Thanks again.  

[Hal_L]

Hi Opal,

Here is what you should do for the hardware connections with these devices:

- connect your external signal to the BNC-2090

- connect the 68 pin connector on the BNC-2090 to the 68 pin connector on your DAQ board. You should have a 68 to 68 pin cable for this.

That is all that is involved with the hardware connections. After this, you should be able to read your signal. Here is the link to a helpful DAQ manual with in depth getting started information: DAQ Getting Started Guide. I hope that you find this information helfpul.

Regards,
Hal L.