OHAUS Adventurer Pro Balances, Service Manual

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PPENDIX A STANDARD CALIBRATION
A. STANDARD CALIBRATION
Adventurer Pro balances can be calibrated in two ways: Span calibration or Linearity calibration. Span
calibration resets the balance's weighing range using two weight values: zero and a weight value
between 25% and 100% of the balance's capacity. Linearity calibration minimizes deviation between
actual and displayed weights within the balance's weighing range. Three weight values are used:
zero, a weight value at or near the midpoint of the balance's weighing range and a weight at or near
the balance's specified capacity. Calibration should be performed when the Load Cell and or the Main
PC board is replaced. Table 1-1 in Chapter 1 specifies span, linearity and alternate span calibration
points.
A.1 Span Calibration
When the balance is repaired, it must be calibrated to ensure accurate weighing results. Be sure to
have the appropriate calibration weights available before beginning calibration.
1. Press and hold the Menu-Cal button until MENU is displayed, then release the button.
CALIBRATE (blinking) is displayed.
2. Press the Yes button to enter calibration menu.
3. Press the Yes button to initiate span calibration. Press the Exit button at any time to abort
calibration.
4. First the zero reading is taken. Next the primary display shows the default span calibration
weight value. Press No to change to an alternate calibration weight. Press Yes when the
desired calibration weight is displayed.
5. Place the specified calibration weight on the platform. After calibration, remove the weight
from the pan.
A.2 Linearity Calibration
When the balance has been repaired, perform linearity calibration.
1. Select LINEARITY from the CAL sub-menu.
2. Press the Yes button and follow screen instructions. Use the weight values shown on the
primary display.
3. After calibration, remove the weight from the pan.