Weight measuring method using a plurality of sensors

Method of reducing the error in a scale system which multiplexes among a plurality of signals comprising the following steps:

• (1) producing at least one sensor signal;
• (2) producing a reference signal which is stable in relationship to the sensor signal such that the difference between the reference signal and the sensor signal is useful in determining the load weight;
• (3) sampling the reference signal and the sensor signals according to a prescribed sampling sequence wherein the reference signal is sampled immediately before or immediately after a sensor signal;
• (4) converting the sampled signals to digital representations;
• (5) processing the digital representations in accordance with a system error model to derive a corrected weight value.

A method of compensating a weight measuring scale comprising the following steps:

• (1) producing a set of sensor signals from a plurality of load sensors;
• (2) generating an approximate weight estimate signal based, at least in part, on the sensor signals;
• (3) determining a mathematical expression for corrected weight based at least in part on the generated weight estimate signal and the sensor signals;
• and
• (4) deriving a corrected weight measurement based at least in part on the determined expression for corrected weight, the sensor signals and the weight estimate signal.