The Menu; Calibration - Observator Instruments Diff-Automatic User Manual

3. The menu

The following menu will appear when the DIFF is powered.
Menu
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Measurement
Storage

Calibration

Off
Settings
You can scroll true the menu by rotating the control button. Push in the middle of the control button to
select the option.
3.1 Calibration
Calibration of the DIFF is necessary after powering. The ultrasensitive pressure sensor will be adjusted to
the environmental temperature.
It is advisable to let the DIFF acclimatize for a minimum of 15 minutes when there are big
differences in temperature. The DIFF has to be calibrated after the acclimatizing. It is
recommended to calibrate the DIFF from time to time during usage.
To ensure the accuracy, it is necessary to calibrate the DIFF at least once every 30 minutes. When the
environmental temperature is changing rapidly, or when the DIFF has a different temperature than the
environment in which it is used, it is necessary to calibrate more often.
Please note that the DIFF has to stand on a flat surface and the room has to be free of air flow, while
calibrating (close doors and windows).
When the DIFF is being calibrated the following screens will show up:
Calibration
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Calibrating...
Calibration Calibration
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Successful. failed!
The last screen indicates that the calibration failed. The failure can be caused by air flows in the room.
Make sure that the DIFF is calibrated on a flat surface. You can put a flat object on top of the DIFF to
avoid airflow through the DIFF.
Version: 12.6 EN
Calibration
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Testing...
or
Date: 22-09-2020
User Manual Diff
AT-DIFF
Page: 9 of 28