PORTABLE DIGITAL WEIGHT MEASURING DEVICE

摘要

PORTABLE DIGITAL WEIGHT MEASURING DEVICE The specification discloses a portable digital weight measuring device. The weight of an object is firstly converted into electrical signals by means of a plurality of strain gauges, piezoelectric or other transducers. The electrical signals are then sent to a summing system which comprises an operational amplifier and an A-D converter. The operational amplifier serves to sum the electrical signals from the strain gauges or piezoelectric transducers to a single electrical signal proportional to the weight of the object. The A-D converter such as a micro-processor which controls display, does the A-D conversions and linearizes the sensor and converts the summed signal to a digital signal. The digital signal is finally displayed by a LED display. The device may be powered by any electrical sources, but preferably, by a battery or an AC converter. The weight measuring devices according to this invention are compact in size and light in weight. Thus, they are suited for carrying in a briefcase or suitcase, thereby enabling people to watch their weight during their travelling.