14
7 8 7 5 S c a n n e r / S c a l e
Service Calibration Display is required unless your 7875
has voice enabled. Calibration information is NOT sent
to the host terminal. Contact your Symbol representa-
tive about calibrating the scale.
Note:
The interface cable between the 7875 and host terminal
must be disconnected during calibration. Some hosts
may cause interference that invalidates scale calibration.
You can calibrate the scale after power is supplied for 30 minutes if
the ambient air conditions are 68° F (20° C) for at least 24 hours. If
this condition has not been met, the scale must be on for at least 6
hours before you can calibrate it. Also, you must use a certified
weight set to calibrate and certify the scale.
The EEPROM on the scale board maintains an audit trail of scale
calibration and programming activity. The audit trail contains an
event counter that records the number of times the scale has been
calibrated. You can display the audit trail count on an integrated,
remote, or Field Service Calibration Display by pressing the Scale
Zero Button on the Operator Display Panel. The display alternates
between Cal xxx and PAr xxx.
Exercise the Scale
You must exercise the scale before performing a calibration. Add
and remove weight to your scale in the order provided in the
following chart. In this building procedure you start with no weight
(0) and sequentially add and remove weight to obtain the values
shown in the chart. Perform this procedure four times
.
Weight
Feature
Total Weight on Top Plate
9.995 kg
0.0 kg
2.5 kg 5.0 kg
10. 0 kg 5.0 kg
2.5 kg
0.0 kg
13.995 kg 0.0 kg
2.5 kg 5.0 kg
15.0
kg 5.0
kg 2.5 kg 0.0 kg
30.0 lb.
0.0 lb.
5.0 lb. 15.0 lb. 30.0 lb. 15.0 lb. 5.0 lb.
0.0 lb.
