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4 Operation
If you have trouble zeroing, you may need to skip to section 4.8.1.3
Cell Failure.
Auto Mode Zeroing
Select ZERO to enter the ZERO function. The ZERO screen allows
you to select whether the zero calibration is to be performed automatically or
manually. Use the DOWN/UP control to toggle between AUTO and MAN
zero settling. Stop when AUTO appears on the display.
ENTER to begin zeroing.
The beginning zero level is shown in the upper left corner of the dis-
play. As the zero reading settles, the screen displays and updates information
on Slope (unless the Slope starts within the acceptable zero range and does
not need to settle further).
Then, and whenever Slope is less than 0.08 for at least 3 minutes,
instead of Slope you will see a countdown, such as 1 Left, 0 Left. These are
steps in the zeroing process that the system must complete, AFTER settling,
before it can go back to ANALYZE.
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 screen.
Manual Mode Zeroing
ENTER the ZERO function. The screen that appears allows you to
select between automatic or manual zero calibration. Use DOWN/UP to
toggle between AUTO and MAN zero settling. Stop when MAN appears on
the display.
ENTER to begin the zero calibration. After a few seconds the first of
five 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. It calculates the differences between successive samplings and
4-12
Zero: Settling: AUTO
<ENT> To Begin
####
% Zero
Slope=####
####
% Zero
1 Left=###
ppm/s
Zero: Settling: Man
<ENT> To Begin
Teledyne Analytical Instruments
ppm/s
Model 3020M
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