Aalborg XFM Series Operating Manual page 21

Figure b-6: XFM Screen in the beginning of Auto Zero procedure.
The Auto Zero procedure normally takes 1 - 2 minutes during which time the DP
Zero counts and the Sensor reading changes approximately every 3 to 6 seconds.
Figure b-7: XFM during the Auto Zero procedure.
The nominal value for a fully balanced sensor is 120 Counts. If the XFM's digital
signal processor was able to adjust the Sensor reading within 120 ± 10 counts,
then Auto Zero is considered successful. The status LED will return to a constant
GREEN light and the screen below will appear:
,
Note: The actual value of the Sensor and DP counts will vary for each
XFM.
If the device was unable to adjust the Sensor reading to within 120 ± 10 counts,
then Auto Zero is considered as unsuccessful. The constant RED light will appear
on the status LED. The user will be prompted with the "AutoZero ERROR!" screen.
,
Note: For XFM with RS-232 option all Auto Zero status info available
via digital communication interface.
AUTOZERO IS ON!
AUTOZERO IS ON!
S:
AutoZero is Done
S:
Figure b-7: XFM during the Auto Zero procedure.
405 DP: 512
122 DP: 544
18