Recent content by Sotiris

I tried again today, nothing worked. The next step is to open open the lock in in case we find something odd with the board that can be fixed. Your suggestions were thorough enough, thanks again. I'll post what happened when we find out.

For now, i know that the input is not saturated for sure, and the lock in is in "f" mode. I'll try to adjust the phase and replace the cables tomorrow. Another thing that i noticed, is that in the oscilloscope the chopper's signal is very steady, but in the lock in, many times it differs (for...

Thanks for your reply. The external button is active because the lock in is showing the chopper's frequency as reference. Also, the chopper's output is already ac. The last suggestion was interesting, i tried it and the signal was indeed healthy and steady, but the output of the lock in is...

Hello, I'm using a lock in amplifier (model 5210 from signal recovery) for some experiments with photodiodes. Firstly, there is an optical chopper that "feeds" the lock in (reference signal). My input is a photodiode (in current mode). The problem is,the unlock (unlk) light is always on in the...