NCR 74 OFX (7874), User Manual

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Chapter 3: Installation 3-13
The RealScan 74 maintains an audit trail of scale calibration and weighs parameter
setting. The audit trail consists of two even counters. Display the audit trail count by
pressing and holding the Scale Zero button on the Operator Display Panel. The
display alternates between
Cal xxx
and
Par xxx
. The Cal value is the number of
times the scale has been calibrated. The Par value is associated with the weigh
parameter setting and should never change.
Note: The audit trail displays only on units with the RealScan 25 Remote Display.
Note: Some host terminals can corrupt the calibration settings if they are connected
during scale calibration. Therefore, NCR recommends disconnecting the interface
cable before starting calibration of the scale and then reconnect it after completing the
calibration procedure.
Perform the Calibration Procedure
Note: If a protective plastic covering is present on the Top Plate or the clear plastic
door below the Top Plate, ensure that it is removed before calibrating the Scale.
The scale firmware controls the calibration procedure. It waits for a response to each
prompt before going to the next step. The firmware uses the voice feature and the
display to identify how much weight to place on the Top Plate. After the required
weight has been placed on the Top Plate and the Scale Zero button is pressed, the
firmware sounds a single tone and goes to the next prompt.
The calibration procedure can be ended before completion by turning the unit off.
However, if this is done, the scale must still be calibrated before placing it into service.
Note: The pound and kilogram weights used for calibration are not equivalent
values. They are the actual weights the firmware needs to perform the calibration.
Note: Turn off the EAS system during scale calibration.