Ramp - OHAUS PA64 Service Manual

APPENDIX B SERVICE CALIBRATION
B.3 Span Calibration
Span calibration from the service menu allows you to set a new zero and maximum setting.
This is distinct from user level span calibration, which allows a user to adjust the zero and
maximum setting within the range established by the service menu span setting.
The balance should be perfectly level before attempting a span calibration.
Use the balance's leveling feet (at the rear of the balance), together with the
leveling bubble which is just to the right of the Display.
Be careful not to touch the scale or the table while calibration is in progress,
as it will cause the process to fail
Enter the Service Menu by pressing and holding
On/Zero Off and Unit together. As the balance powers
up, SERVICE appears followed by RAMP.
Press No to advance to Span Calibration.
SPAN appears. Press Yes.
The specified maximum mass weight flashes.
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 span calibration finishes, 3 Lin appears.
Press Yes, to proceed to 3 Point- Linearity Calibration.
To exit, press No and then Yes to end service
calibration.
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.
Ohaus Corporation www.ohaus.com
NOTE:
ServICe
B-2

ramp

SPAn
4000
BUSY
--0--
3 Lin
Pioneer™ Balance Service Manual