Manual Mode Zeroing - Teledyne 6020 Operating Instructions Manual

Photometric analyzer

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3 Operation

The zeroing process will automatically conclude when the output is within

the acceptable range for a good zero. Then the analyzer automatically returns to

the Analyze mode.

3.4.1.2

Enter the Zero function. The screen that appears allows you to select

between automatic or manual zero calibration. Use the UP/DOWN switch

between AUTO and MAN zero settling. Stop when MANUAL appears, blinking,

on the display.

Enter to begin the zero calibration. After a few seconds the first of three

zeroing screens appears. The number in the upper left hand corner is the first-

stage zero offset. The microprocessor samples the output at a predetermined

rate.

The analyzer goes through C–Zero, F–Zero, and S–Zero. During C–Zero

and F–Zero, use the UP/DOWN

as close as possible to zero. Then,Enter.

S–Zero starts. During S–Zero, the Microcontroller takes control as in Auto

Mode Zeroing, above. It calculates the differences between successive sam-

plings and displays the rate of change as Slope= a value in parts per million per

second (ppm/s).

Once zero settling completes, the information is stored in the analyzer's

memory, and the instrument automatically returns to the Analyze mode.

3.4.1.3 Detector Failure

Detector failure in the 6020 is usually associated with inability to zero the

instrument with a reasonable voltage differential between the reference and

measure voltages. If this should ever happen, the 6020 system alarm trips, and

the LCD displays a failure message.

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Part I