38 DF-745SG
User Interface
Figure 22: Calibrate Menu
7.4.4.1 Check/Adjust Zero
Figure 23: Check/Adjust Zero Menu
The Check/Adjust Zero screen displays many pieces of information including a live
reading of moisture in ppb (or ppm) and the state of the zero gas control valves.
Also depicted are
Zero Reference
and
Zero Offset
values.
The
Zero Reference
value is a reflection of the deviation of the instrument’s
baseline from what was set at the factory. The zero reference of an instrument
from the factory will be 0.00. After a manual or auto zero is performed, this value
may change slightly.
If the moisture cell has been previously calibrated by the user,
Restore Factory
Zero
will be enabled on this screen. Enacting this will erase any user zero and
restore the factory set point.
The
User Zero Offset
and
Active Zero Offset
are two mechanisms to modify
the zero baseline. When the Active Zero feature is turned on, the
User Zero
Offset
display is inactive and Active Zero Offset will be displayed instead. See
page 55 for additional information on the
Active Zero
feature.
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