MTS Series 793 - Manual (Page 209)

Item Callout
Digital Signal 7
Offset 8
The offset applies to the feedback signal. You specify the offset in
engineering units.
Electrical zero considerations
Consider the following before shifting the electrical zero:
• Unlike the Calibration tab’s conditioner Zero controls, electrical zero values are not used in the delta K
calculation.
• The shifted electrical zero position is not a calibrated zero position.
• You can shift the conditioner’s electrical zero to any position within the sensor’s full-scale capacity, but
your usable range is limited by the sensor’s calibrated full-scale capacity.
Linearization data
Using linearization data requires specific conditioner zeroing practices. Ensure that the Electrical Zero control
on the Offset/Zero tab of the Inputs panel is set to zero. Also, ensure that the Electrical Zero Lock box is
selected. Leaving electrical zero unlocked will invalidate data collected during linearization routines.
About Electrical Zero
Use of Electrical Zero with Gain/Linearization type calibrations
When you perform a Gain/Linearization type calibration on a Model 493.25 DUC in the linearization mode,
you must ensure that the controls pertaining to electrical zero are set properly.
Specifically, you must set:
• The Electrical Zero control on the Offset/Zero tab of the Inputs panel to zero, and
• The Electrical Zero Lock box to enabled.
The state of the Electrical Zero control and the Electrical Zero Lock box is saved in the station parameter set.
Electrical zero messages
If these conditions are not present when you attempt to load or save a parameter set, the application will
display one of the following messages.
Message Message Location
Clearing the Electrical Zero Lock box on a Model 493.25 conditioner that
is using full-range calibration is not supported. Message Log
Modifying Electrical Zero on a Model 493.25 conditioner that is using
full-range calibration is not supported. Message Log
There are one or more Model 493.25 conditioners in which Electrical Zero
has been modified, and a full-range calibration is defined. This has the
potential to affect calibrations. Dialog Box
MTS Series 793 Control Software 209
Station Setup