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Discussion in '35mm Cameras and Accessories' started by leicarfcam, Feb 12, 2009.
Does anybody know if the OM1/OM1n/OM2/OM2n cameras use a bridge circuit or series circuit??
I think they use film.
Wheatstone bridge based upon relative resistance, if I recall high school physics. The OM series relies upon 1.35v mercury oxide constant output cell for accuracy, so my guess is it is a series circuit, not a Wheatstone bridge.
The galvanometer without power would rest near the bottom of the screen. Only with power can you make it move to the center position. In a bridge circuit you would need a galvanomter that would rest at the center so I think it has the series circuit.
The OM2 - OM2n uses 1.5v silver oxide batteries, not mercury.
OM-1/1N uses cds cells in parallel with dividing network of resistors. Meter accuracy relies on 1.35V coming in as with schotkey diode 1N-6263 and 1.55V silver oxide battery (357, 303, SR44W, G-13, MS76, KS76). John, www.zuiko.com
Yes I am aware of that but non-mercury battery powered meter circuits can be bridge or series circuits also.