zebris Medical GmbH FDM Technical Data and Operating Instructions Page 29/36
6.2 Checking the FDM Sensor
Control measures
The measuring system must be checked at regular intervals to
ensure that the measuring system is functioning properly.
Should any damage to the measuring surface become evident (e.g. something fell hard on
the black measuring surface), no further measurements must be taken. If visible damages
are detected not further measurements are permitted.
After carrying out a baseline measurement, no measuring values may be shown for a
condition without any load. In addition, the force distribution images are to be checked
regularly for untypical measuring patterns. These include above all, line or column-shaped
measuring patterns deviating from the surrounding values.
Whenever faults occur or in case of doubt, the manufacturer or sales partner authorized by
zebris must always be contacted.
Calibration measures
The measuring accuracy of the sensors for the force distribution measurement is to be
checked from time to time using a defined application of force.
To do this, the user, knowing the body weight, can stand on the platform on one foot. The
platform must show the approximate body weight, taking the force of gravity, the sensors
at the edges that may not be subject to the full pressure, and the measuring tolerance into
consideration.
In case of deviations larger than > ±5% of max range a recalibration at manufacturers side
is required.
Should the display be incorrect, a recalibration by the manufacturer is required.
As a general rule, it is highly recommended checking the measuring
platform every two years and having it recalibrated in order to
permanently ensure the given measuring accuracy.
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