how to increase data acquisition speed ?

[einstein182]

I'm trying to measure the number of times a light goes on and off in a specific system using high speed photodiode, however the photodiode sees only the initial state and the final state, so i need to increase the speed of the data acquisition to catch up with the photodiode. please tell me what should i do, taking by account that i'm using NI 6210.please simplify the answer as much as possible since i just started using LabView.

Ps, I attached a picture of my program

Thanks alot

Joann

[labview12110]

I would wire everything except the data read for the daq outside the while loop instead of using the assistant. Can you just increase the sampling rate of the daq or is it at the max?

[Dennis_Knutson]

Everything is hidden by the DAQ Assistant so your sample rate and number of samples is unknown. You are also using the evil dynamic data and using it incorrectly. I believe the comparison function only acts on the very last data point so if you have multiple transitions, your code will not detect them. Show the front panel and the assistant settings. How often is the signal supposed to change?

[einstein182]

the sampling rate of the daq or is it at the max, how ever i tred to change it but nothing changed.

the signal supposed to change about    20/second .

[Dennis_Knutson]

And have you gotten rid of the dynamic data and your incorrect user of the comparison function? Why haven't you shown the front panel as requested?

[mikeporter]

Problem Number 1: are using an analog channel to measure digital transitions.

Do you just need the count, or the time between transitions too?

Mike...

[einstein182]

I  attached a picture of the front panel.

I am using analog channe, i need just to count 

[Dennis_Knutson · Accepted solution]

So now your problem is that you aren't acquiring anything? The graph is blank. Why didn't you show the assistant settings? Are you still using the evil dynamic data?

[einstein182]

i'am acuairing data on the graph, but the graph is not the important part, i need the program to count the palsis 
I don't know what is the "assistant settings" or  "evil dynamic data" !!!

[Dennis_Knutson]

The DAQ Assistant has settings. Show an image of that. Show an image of a graph with data. Don't use dynamic data - the grey wires.