03-16-2015 06:03 PM
Hi,
I use MCdaq201 to acquire signal from a photodiode. What I see in oscilloscope, is a beautiful sine wave!, exactly what I was expecting. Then, I connect it to the PC via MCdaq-USB201, I see a signal which is like it has been cut within a specific range. I've attached the screenshot of the output of labview program and tracerDAQ. Does anyone know what could be the reason?
Thanks
Petar
Solved! Go to Solution.
03-16-2015 11:02 PM
03-17-2015 09:55 AM
Ok, I will. thanks for your reply.
03-18-2015 04:09 AM
Just some quick hints...
Your DAQ may have a BIAS current, that can do funny things with photo diodes ...
The input impedance of your DAQ and the scope migth be different.....
03-18-2015 02:41 PM
Thanks for your reply, but I also connected an external resistor to the photodiode, but,,,,the output is the same :(...without any change
03-22-2015 02:23 PM
03-23-2015 09:58 AM
Thanks so much for all your helpful advices, YES! We used a pre-amp between the photodiode and the DAQ device, and acquired the desired signal!
And, I'm really HAPPY! 🙂