Overall control of the instrument

Virtually every optical Instrument commercially available at present accommodates a microprocessor which, through a small keyboard, allows the user to select the different instrumental variables and programming the Instrument s functioning during the analyses. More recent and sophisticated Instruments have no keyboard and are controlled via a screen on which the working modes and parameters are selected by means of a mouse . 

High and low limits Flags tests values outside user-specified range 

Auto zero Sets zero absorbance or 100XT 

Control of an accessory Set RS232C interface parameters (baud rate, parity, etc.) 

Test parameter storage Programmed parameters become default values 

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An instrumental control system. A computer is used to collect and display data and for overall control of the instrument. 

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