Appendix B Service Calibration; Entering The Service Menu - OHAUS PA64 Service Manual

APPENDIX B. SERVICE CALIBRATION
This section describes the Service Menu and sub-menus, which allow authorized service
personnel to perform factory calibrations.
B.1 Entering the Service Menu
Turn the balance off.
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 Yes to select Ramp.
Press No to advance to Span Calibration.
B.2 Ramp
The first sub-menu in the Service Menu is Ramp. The ramp display shows the percentage of
use of the A to D circuit. The actual value is not as important as how it changes. It should
increase as the weight on the balance is increased. The ramp display should remain constant
without fluctuations.
To view the Ramp value, press Yes. A number will
appear and should be constant. Place masses on
the balance from minimum to maximum capacity.
The reading will increase but should not fluctuate. The
example at right is with no weight on the Pan.
The reading will vary with other balances.
To exit the ramp function, press No.
The balance advances to the Span calibration menu.
Press Yes to perform Span Calibration.
(See next page.)
Pioneer™ Balances Service Manual

APPENDIX B SERVICE CALIBRATION

ServICe
22.8
B-1 Ohaus Corporation www.ohaus.com
ramMp
Span
%