OHAUS Pioneer PA64, Service Manual

Page: 112 / 116

APPENDIX B SERVICE CALIBRATION
Ohaus Corporation www.ohaus.com B-4 Pioneer
™ Balance Service Manual
The specified maximum weight flashes again.
Place the indicated weight on the center of the Pan.
Busy flashes. After a few seconds Clear Pan flashes.
Remove the mass from the Pan.
4000.00
- - - 0 - - - flashes, as the balance re-calibrates the zero
setting...When calibration finishes, Done appears briefly.
Done
When 3 point- linearity calibration finishes,
5 Lin
appears. Press Yes , to proceed to 5 Point- Linearity
Calibration.
To exit, press
No and then Yes to end service
calibration.
5 Lin
When calibration is finished, the balance returns to the weighing mode.
B.5 5 Point- Linearity Calibration
A five point linearization is also rarely required and is the most difficult to perform accurately
under the less than ideal conditions outside the factory. This service calibration requires that
accurate calibration weights be used. Calibration points are done at approximately 0, 25%, 50%,
75% and 100% of maximum capacity.
The sequence of loading the test weights on the platform is very important to insure a correct
linearity calibration. Refer to the diagram below for the correct weight sequence. Load each
numbered weight (or group of weights if required) in the order indicated (No.1, No.2, No.3, No.4)
then remove in the correct order (No.1, No.4, No.2, No.3). This is done to reduce the affect of
the individual weight inaccuracies on the linearity calibration.