Apparatus for monitoring the selection of chart recording and wa

Details Apparatus for monitoring the selection of chart recording and wa Apparatus for monitoring the selection of chart recording and wa

1974-11-11

1976-03-09

Smith, Alfred E.

Optics: measuring and testing

Range or remote distance finding

With photodetection

346 33A, 356 89, 356 95, G01J 342

Patent

active

039428931

ABSTRACT:
A spectrophotometer system having a first stepper motor driving a wavelength scanning mechanism and a second stepper motor driving a chart recorder, both motors being operative in response to pulses from a system clock. The clock frequency is successively divided by first and second cascaded, switch-selectable sets of frequency dividers. The output of the first divider is applied to the wavelength motor and determines wavelength scan speed. The output of the second divider is applied to the chart motor and determines chart scale expansion. A decoder monitors the frequency selections of the first and second sets of frequency dividers, and upon detection of a frequency selection outside the capability of the chart motor, the decoder provides an output which inhibits both motors. The decoder output additionally actuates a visual indicator to inform an operator of the invalid selection.

REFERENCES:
patent: 3063043 (1962-11-01), Coates
patent: 3563656 (1971-02-01), Helms

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