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  1. #1
    leicarfcam's Avatar
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    Olympus OM1/OM2 question

    Does anybody know if the OM1/OM1n/OM2/OM2n cameras use a bridge circuit or series circuit??

  2. #2
    Jeff L's Avatar
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    I think they use film.

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    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.

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    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.

  5. #5
    mcd
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    The OM2 - OM2n uses 1.5v silver oxide batteries, not mercury.

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    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

  7. #7
    leicarfcam's Avatar
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    Quote Originally Posted by mcd View Post
    The OM2 - OM2n uses 1.5v silver oxide batteries, not mercury.
    Yes I am aware of that but non-mercury battery powered meter circuits can be bridge or series circuits also.



 

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