Bronica ETR Seiko shutter flash contacts: mechanical or electronic?

Hi:

Anyone know if Bronica ETR in-lens (MC) Seiko shutter PC flash synch contacts are simply mechanical/metal, or semiconductor?

I have a mix of flashes with widely ranging terminal voltages...most recent one I checked was over 175 VDC...another was only 7.5, but I forget which that one was.

If I can avoid frying any integral semiconductor switching, I’d like to try.

I do have a Yongnuo trigger somewhere too (RF-603?)...

Thanks

Murray

It's an easy thing to check with a cheap digital multimeter or any continuity tester.

Fire the shutter on B or T and poke the meter probes onto the P-C terminal, with the meter set to read continuity.

If the meter reads close to zero whichever way round you connect the probes, then you have a mechanical switch.

If you can only get a conductance reading with one polarity and not the other, then it's an electronic trigger.

It's an easy thing to check with a cheap digital multimeter or any continuity tester.

 

Fire the shutter on B or T and poke the meter probes onto the P-C terminal, with the meter set to read continuity.

 

If the meter reads close to zero whichever way round you connect the probes, then you have a mechanical switch.

 

If you can only get a conductance reading with one polarity and not the other, then it's an electronic trigger.

Thank you. Good point.

I subconsciously do that in other electronic debug contexts when I don’t know what in-circuit characteristics to expect...so I check with both ohmeter test lead polarities, and if observations lead me to, I’ll check in diode mode &/or capacitance mode. Sometimes those observations can be compared to a 2nd identical item to clarify whether the unknown measurement is normal or at least typical.

That’s when I have a tech hat on. I rarely put the tech hat on when thinking about cameras. Thanks for the reminder.

& thanks Paul Ron for solving the puzzle.