OHAUS DISCOVERY BALANCE, Руководство по обслуживанию

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APPENDIX A STANDARD CALIBRATION
APPENDIX A. STANDARD CALIBRATION
Standard Calibration is performed by one of four methods – Automatic Internal Calibration
(Advanced AutoCal), Span Calibration, Calibration Test and Calibration Adjustment.
A.1 Automatic Internal Calibration (Advanced AutoCal) – Two internal masses are used,
with three weight values: zero, a weight value at or near midpoint of the Load Cell’s weighing
range, and a weight value at or near the Load Cell’s specified capacity.
A.2 Span Calibration (Span) – Span calibration resets the balance’s weighing range using two
weight values: zero and a value between 50% and 100% of the balance’s capacity. Using a
weight at the balance’s capacity will give the most accurate results. To determine specified
capacity, see Table 1-1, Masses Used To Test Discovery Balances.
A.3 Calibration Test (Cal Test) – Calibration test allows the stored calibration data to be tested
against the current mass being used for the test.
A.4 Calibration Adjustment (Cal Adj) – Calibration Adjustment allows adjustment of the
internal calibration to match an external calibration weight
Note:
Calibration will be locked out if the balance is in Legal For Trade mode. To regain
access to locked balance settings, break the seal on the back, and power up the
balance while depressing the Lock Switch that was covered by the seal. Calibration
can also be locked out from the Lockout Menu. To allow calibration from the Lockout
Menu, press and hold Menu, then press
No until Lockout appears. Press Yes .
When Calibrate appears, press No . Then press Exit .
The Calibration Menu
To navigate the Calibration Menu, proceed as follows:
Press and hold CAL until Menu-Calibrate appears.
Press Yes to see sub-menus.
Press
Yes
to choose the sub-menu selection.
Press
No
to advance to the next sub-menu selection.
Press
Back
to go to previous sub-menu selection.
Press
Exit
to return to weighing mode.
Figure A-1. Calibration Menu flow: Press No until the desired option appears, then Yes .
Before beginning calibration, have masses available. Masses required for calibration are listed
in Table A-1, at the end of this section.
Discovery Balance Service Manual A-1 Ohaus Corporation www.ohaus.com