SR400 Triggered Gating

[PbZhang]

Hi,

I used a LabView program to collect the data from SR400 through GPIB.

Now basically what I need is that we send in TTL signal to SR400 and only let the photon signals within the timing duration we want pass through. 

Hence we want to use the high(low) voltage to open the gate and use the low(high) voltage to close it, which means we use the extenal signal to control the gate width.

However, the gate width is determined internally. 

Would you please tell me how can I let the photon signals within the timing duration we want pass through?

Thanks!

[Shalini.M · Accepted solution]

Hi PbZhang,

It seems like the SR400 has a minimum gate width of 5 ns and a maximum gate width of 1s so as long as your desired gate width is within that range you should be fine.

The forum post linked below has an example vi attached that is a good start. I would recommend using it as a template 

http://forums.ni.com/t5/Multifunction-DAQ/counting-edges-from-a-photon-counting-pmt/m-p/3005671

[PbZhang]

Thank you very much! I solved the problem by using an external gate.