Improving the accuracy of jarrell-ash microphotometers.
A modification to a Jarrell-Ash model 23-100 recording microphotometer used to read spectroscopic plates is described. The modification allows the motion of the plate to drive incrementally a stepper motor chart recorder. The modification uses inexpensive off-the-shelf components and was installed in the field. The plate reading accuracy of the instrument was improved by a factor of 2-5, and problems associated with occasional plate drive slippage were eliminated.
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Donlan