I'm a materials reliability scientist, not an electrical/electronics engineer, so I could use some help. I am running an experiment where I pass between 0.5 and 5A through 50 DOT's and measure a voltage drop across the devices w.r.t. time, up to 500 hours.
At some time, a device will fail, causing an open circuit. If this happens during a weekend, I am not near the equipment to short around the device that failed, so that the other DOT's resume current testing. There are two issues with this:
- Lost test time when the whole circuit is open, and
- Possible partial recovery of the remaining devices. The voltage across the failed device is 42V, but I can adjust the current source to a lower maximum voltage.
I think adding a small circuit that will short out the failed device, so that the remaining devices continue to be exposed to the test current, might be possible. Including a simple mechanical switch and an indicator LED would be nice. Because I would need 50 of these circuits, they would need to be small and inexpensive.
I have looked at latching relay circuits on this forum, and they are all connected to ground. I don't think this is possible with what I want to do.
Here is a sketch of my test:
Any help would be appreciated.
Thanks for the helpful replies. Here is another sketch, is something like this do-able?