uv/vis maintenance

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Wondering is anyone would have any suggestions on locating either an operating manual or service manual for a Beckman 530 spectrometer. I haven't had any luck looking online. I'm not getting any errors on the instrument, but I believe the absorbance is not accurate, and I'm looking for pointers on how address the problem. Any help would be greatly appreciated.
To be sure about absorbance readings , try potassium dichromate solution at special wavelenghts ; you may find the complete procedure by Google search '' qualification of spectrophotometers ''
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