Appendix A Standard Calibration Calibration; Calibration Masses; Span Calibration - OHAUS PA64 Service Manual

APPENDIX A. STANDARD CALIBRATION
A.1 CALIBRATION
There are two types of standard calibration for Pioneer balances: Span and Linearity. Span
calibration sets the balance's weighing range, within pre-set limits, for zero and a weight value
at or near the balance's capacity. Linearity calibration minimizes deviation between actual and
displayed weights within the balance's weighing range. Three weight values are used: zero, a
weight value in the middle of the balance's weighing range and a weight value at or near the
balance's specified capacity.
A.1.1 Calibration Masses
Before beginning calibration, ensure that masses are available. If you begin calibration and
realize calibration masses are not available, exit the menu. The balance will retain previously
stored calibration data. See Table 4-1 for specified masses for all Pioneer models. Masses
must meet or exceed ASTM Class 1 or OIML E1 Tolerance. Calibration masses are available
as accessories from any Ohaus dealer.
A.2 Span Calibration
With the balance on, press and release Unit/Menu. until
CAL appears. Press Yes (the On/Off button).
SPAN appears. Press Yes.
The specified mass weight flashes.
(Pressing No will toggle to alternate mass weight.)
Place the indicated weight in the center of the Pan.
Busy flashes. After a few seconds Clear Pan flashes.
Remove the mass from the Pan.
- - - 0 - - - flashes, as the balance calibrates a zero
setting.
When calibration finishes, Done appears briefly, and the
balance returns to weighing mode.
NOTE: If calibration fails, ensure that the test area is free from drafts and the surface the
balance rests on is level and free of vibrations. Then try to calibrate again. If it continues to fail,
there may be an internal problem. To resolve internal problems, follow procedures in Chapter 3.
Pioneer™ Balances Service Manual
APPENDIX A STANDARD CALIBRATION
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A-1 Ohaus Corporation www.ohaus.com
.CAL.
SPAn
4000
BUSY
Done