Manual Mode Zeroing - Teledyne 2000A-EU Operating Instructions Manual

Thermal conductivity analyzer

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Table of Contents

Thermal Conductivity Analyzer

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

Slope you will see a countdown:

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

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

toggle between

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

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

second (ppm/s).

Note: It takes several seconds for the true Slope value to display.

Wait about 10 seconds. Then, wait until Slope is sufficiently

close to zero before pressing Enter to finish zeroing.

4.4.1.2