Calibration Of Scale - Welch Allyn 5002 Service Manual

Calibration of Scale

Your scale has been carefully calibrated at the factory. Only use calibrated, certified scale test weights for this
purpose. Calibration weights may be purchased from WELCH ALLYN or a local scale dealer.
TEST CALIBRATION WEIGHTS ARE AVAILABLE FROM WELCH ALLYN. THREE (3) 25 KILOGRAM TEST WEIGHTS ARE
RECOMMENDED. ORDER PART NO. 20021W. (25 KG TEST WEIGHTS)
Large changes in calibration often indicate a damaged load cell or faulty readout component. Those not having
proper tools or knowledge of electronic systems and their attendant shock hazards should not attempt calibration.
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. Make sure the scale is on a flat hard surface with no physical interference. Press
ii. Screen will show ZErO and a number while the calibration is in process and
c. Defult: Zero calibrate the scale for 0kg = 0mV/V.
5. SPAN is to do span calibration, press REWEIGH key for the options
a. No: Do nothing.
b. Yes: Span calibrate the scale with the user-entered weight and the weight currently on
the scale.
i. Place the calibration weight in the center of the scale and press the LB/KG key
ii. The screen will show US for lbs, press the REWEIGH key to change to
iii. Enter the calibration weight being used. The default for lbs is 400.00 and the
iv. Screen will show SPAN and a number while the calibration is in process and
c. Defult: Span calibrate the scale with the capacity and mV/V taken from the scale type
table.
the LB/KG key to begin calibration.
dONE when the calibration is complete.
to begin calibration.
n ¯ EtriC(MEtriC) for kilograms. Press the LB/KG key to select units for calibration.
default for kg is 200.00. The REWEIGH key increments and the RECALL key
decrements the selected digit. The LB/KG key moves to the next digit and starts
the calibration after the last digit.
dONE when the calibration is complete
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