APPENDIX B SERVICE CALIBRATION
Valor™ 2000 Series Service Manual B-1 Ohaus Corporation www.ohaus.com
APPENDIX B. SERVICE CALIBRATION
This section describes the Service Menu and sub-menus, which allow authorized service
personnel to perform factory Linearity and Span calibrations (no pre-set limits).
Note:
Be careful not to touch the scale or the surface it rests on while calibration is in
progress, as it will cause the process to fail.
B.1 Entering the Service Menu
Turn the scale off.
Press and hold ON >O/T< / Off and UNIT / Menu for 10 seconds until
SErVC appears.
B.2 Ramp Menu
When S.rAMP appears, press YES to accept the Ramp menu, or NO to
advance to the Service Calibration menu item.
The ramp display shows the percentage of use of the A to D circuit, that is, of the temper-
ature-compensated duty cycle. The actual value is not as important as how it changes.
– It should increase as the weight on the scale is increased.
– The ramp display should remain constant without fluctuations.
If you press Yes to select Ramp, a number appears. It should be constant. Add masses
from minimum to maximum capacity. The reading will increase, but should not fluctuate.
The Ramp value is displayed as a percent of the A/D range.
Press YES to advance to the Capacity menu item.
Press NO to exit to the weighing mode.
Note: Ramp is used to troubleshoot load cell problems. 0% represents no
signal from the A/D, 100% reflects the upper signal range of the A/D.
B.3 Capacity Menu
When S.CAP appears, press YES to accept the Capacity menu item,
or press NO to advance to the Unit menu item.
The current Capacity Setting is displayed, blinking.
(Outlined characters represent a flashing display.)
Note: The available settings are 3, 6, and 15. The default setting is 3.
Press NO to step through the settings. Press YES to accept the setting
and move to the Service Unit menu item.
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