Manual Mode Zeroing - Teledyne 6000B Operating Instructions Manual

Photometric analyzer

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Photometric Analyzer

the lower right corner of the screen as C—Zero, for 3 min, and then does a fine

zero, and displays F—Zero, for 3 min.

Then, and whenever Slope is less than 0.01 for at least 3 min, instead of

Slope you will see a countdown: 9 Left, 8 Left, and so fourth. These are

software steps in the zeroing process that the system must complete, AFTER

settling, before it can go back to Analyze. Software zero is indicated by S–

Zero in the lower right corner.

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.

Press Zero to enter the Zero function. The screen that appears allows you

to select between automatic or manual zero calibration. Use the Δ∇ keys to

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

blinking, on the display.

Press 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 predeter-

mined rate.

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

and F–Zero, use the Δ Δ Δ Δ Δ ∇ keys to adjust displayed Zero adj: value as close as

possible to zero. Then, press 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).

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