Hello,
I have an old scientific instrument that uses a photocell to detect light and this cell is connected to a galvanometer with a needle. When the instrument is turned on, all other electronics work, but the galvanometer needle will not respond to light. The photocell is ok since it's resistance seems to change drastically when I keep it in shade, or when I have it in the sunlight. The "zero" function of the galvanometer works when the instrument is turned on. But there is no response to light signals whatsoever. Any tips perhaps on how to start troubleshooting it.
thanks
I have an old scientific instrument that uses a photocell to detect light and this cell is connected to a galvanometer with a needle. When the instrument is turned on, all other electronics work, but the galvanometer needle will not respond to light. The photocell is ok since it's resistance seems to change drastically when I keep it in shade, or when I have it in the sunlight. The "zero" function of the galvanometer works when the instrument is turned on. But there is no response to light signals whatsoever. Any tips perhaps on how to start troubleshooting it.
thanks