OHAUS TA152, Service Manual

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APPENDIX B THE SERVICE MENU
B.4 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.
Span calibration automatically follows Linear calibration. To start from the Service Menu, press
and hold
Print / Cal and UNIT together. RAMP appears. Press No to bypass Ramp. Lin
appears. Press No . Filter appears. Press No . (This adjusts the speed with which the scale
stabilizes. The factory setting is High , and should not normally be changed.)
SPAN appears. Press Yes .
SPAn
The display shows
-C-
while the scale acquires the
zero value.
-C-
The specified maximum mass weight flashes.
Place the indicated weight in the center of the Pan.
200
Pressing Yes after placing the prompted weight accepts
the span weight shown on the display. The display then
shows
-C- while the scale acquires the span value.
-C-
After the span value is acquired, the display shows
done
for 2 seconds and returns to SPAN . Press No.
Lft.rES appears. Press No . End appears. Press Yes .
The scale returns to normal weighing mode.
done
NOTE:
If calibration fails, ensure that the test area is free from drafts and the surface the scale
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.
Traveler™ Series Service Manual B-3 Ohaus Corporation www.ohaus.com