OHAUS Pioneer PJX Series, Service Manual

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APPENDIX B – SERVICE MENU
Pioneer PJX Series Service Manual 41 Ohaus Corporation www.ohaus.com
3 Point- LINEARITY CALIBRATION
A three point linearization is also rarely required and is 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, 50% and 100% of maximum
capacity. After the linearization procedure the balance will automatically start a Service Span
calibration and then a Service Internal Calibration.
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.
5 Point- LINEARITY CALIBRATION
A five point linearization is 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.