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How To Calibrate Scales With Weights, Calibration Instructions And Manuals

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Central Carolina Scale Service, Repair and Scale Calibration Information


The following information is based on the Healthometer 402KL mechanical doctors scale. The accuracy of these scales when calibrated at the factory is within plus or minus 1/4 pound. This means that two properly calibrated scales can vary 1/4 pound from each other and still be calibrated correctly. For the most accurate weight, use the scale on a hard level surface and stand in the center of the platform with the weight distributed as evenly as possible. If the error seems excessive, check the following:

1 Zero Balance of Beam
The beam must be balanced so the pointer comes to rest in the center of the trig-loop when both poises are set at zero. Make certain that the large poise is firmly seated in the notch and the small pose is firmly against the shoulder of the beam. Adjust the balance by turning the screw at the left end of the beam.

2 Beam Does Not Move Freely
Check if the beam pointer is touching the side of the trig-loop in its range of travel. Contact Factory Technical Support for instructions on realigning the beam.

3 Platform Rocks Excessively or Touches Base at Any Corner
When you push down at any corner of the platform, you should not feel any significant rocking. If you do, please contact Factory Technical Support for instructions on leveling the platform.

4 Beam Does Not Move at All during Weighing Process
This may be caused by the poises being set to a higher weight than the person’s actual weight. Reset the weights to a lower weight. An improperly connected Steelyard Rod (the rod that runs inside the pillar) or a disconnected rod which can occur if the scale is transported may also be the cause.

5 Scale Out of Calibration
This can happen if an adjustment is jolted out of place during transit or by wear in the notches in the beam after a long period of use. Lifting the large poise over the notches during movement will preserve the accuracy of the scale and lengthen the life of the beam. The accuracy should be determined with accurate test weights or the scale should be compared to a scale known to be accurate, such as a commercial scale with a Weights & Measures sticker affixed. The scale can be recalibrated by loosening the lock screw at the end of the long lever in the bottom of the base with a 5/16” hexagon socket wrench and moving it outward (longer) in the elongated slot to decrease the indicated weight or inward (shorter) to increase the indicated weight. One sixteenth inch movement of the screw will change the indicated weight by approximately 1/4 pound per 100 pounds.





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