Macbeth Densitometer; manual and/or help

Discussion in 'Darkroom Equipment' started by younger, Aug 3, 2005.

  1. younger

    younger Member

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    I've acquired a Macbeth TR927 densitometer. Though it apparently works, the densities seem to be a decimal point off from expected, i.e., 0.02 instead of 0.2. Does anyone have a manual or copy of the manual for this densitometer? Or can anyone provide some basic instructions to ensure it's working properly? I'm still in a position to return it where I bought it if it's not working correctly.
    Thanks very much for any help.
    Bob Younger
     
  2. Helen B

    Helen B Member

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    Bob,

    I have a pdf manual for the 927 and can email it to you.

    Have you calibrated it?

    Best,
    Helen
     
  3. younger

    younger Member

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    Helen,
    I'd appreciate the .pdf; that would go a long way.....
    But no, I've not calibrated it. I was trying to just use it for differential readings, i.e., density over Fb+F. I don't have the calibration strips for transmission; I do have a reflection standard.
    Thanks very much!
    Bob
     
  4. younger

    younger Member

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  5. Helen B

    Helen B Member

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    The pdf has been sent. I'd say that the readings would be meaningless if the instrument hasn't been calibrated - the calibration pot is too easy to adjust. You zero the transmission head without any calibration reference - it's described in the manual - but you need some kind of reference for the span.

    Best,
    Helen