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Calibration of Scale
Your scale has been carefully calibrated at the factory. This calibration involves matching and tuning of the load cells
and readout electronics. The scale calibration should be checked annually. Only use calibrated, certified scale test
weights for this purpose. Traction or physical therapy weights are NOT acceptable since their actual weight can
often be in error as much as +/-10%. Calibration weights may be purchased from WELCH ALLYN or a local scale
dealer. An alternative to calibration weights is the weight comparison method. This requires a known accurate,
calibrated scale. A fixed weight is “weighed” on the calibrated scale then the same weight is placed on the scale for
comparison.
TEST CALIBRATION WEIGHTS ARE AVAILABLE FROM WELCH ALLYN.
TWO (2) 10 KILOGRAM TEST WEIGHTS ARE RECOMMENDED.
ORDER PART NO. 20022W. (10 KG TEST WEIGHTS)
If only "pound" test weights are available conversion is as follows:
1.0 Pound = 0.454 Kilograms
5.0 Pounds = 2.268 Kilograms
10.0 Pounds = 4.536 Kilograms
20.0 Pounds = 9.072 Kilograms
25.0 Pounds = 11.34 Kilograms
Large changes in calibration often indicate a damaged load cell or faulty readout component. It is generally
recommended that if calibration is necessary for your scale it should be returned to the factory. Calibration
procedure follows for those situations where it is not desirable. Calibration should not be attempted by those not
having the proper tools or knowledge of electronic systems and their attendant shock hazards.
Calibration Procedure
Enter the calibration mode by following exactly the procedure outlined below:
1. Press ZERO, REWEIGH and Power together to enter Custom mode.
2. Device will enter calibration mode by entering PIN 8933.
The scale will cycle through these parameters by pressing LB/KG key.
3. n¯vv (Mvv) shows the current mV/V on the scale (identical to the option in service mode).
4. ZEr0 is to do zero calibration, press LB/KG key to enter options, press the REWEIGH key to go to
the next option
a. No: Do nothing.
b. Yes: Zero calibrate the scale using the weight currently on the scale.
i. Place the cradle on the scale and make sure it is properly seated. Press the
LB/KG key to begin calibration.
ii. Screen will show ZErO and a number while the calibration is in process and
dONE when the calibration is complete.
c. Defult: Zero calibrate the scale for 0kg = 0mV/V.
5. SPAN is do span calibration, press REWEIGH key for the options
a. No: Do nothing.
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