Electrical measurement circuit including a low-pass filter, in particular for weighing
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United States of America Patent
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Jul 30, 1985
Grant Date -
N/A
app pub date -
Nov 30, 1983
filing date -
Dec 2, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A link of controllable resistance comprising an FET (Q16) connected in series with a low-value resistor (R15) is connected in parallel with a time constant determining resistance (R11) in an RC type low-pass filter. A discriminator circuit (40, 50, 60) provides an on/off type signal following variations in the DC component of an input signal present on a terminal (A). A retriggerable monostable (80) defines a 'neutral' time interval of predetermined duration running from the beginning of said on/off signal. At the end of said neutral period, a circuit (20) switches the FET on, thereby reducing the time constant of the RC network in the RC low-pass filter. This time constant is subsequently progressively rasied to a high value by progressively switching the FET off. The filter is specially applicable to weighing a body that is subjected to movement or to oscillation, or to performing weighing measurements in a vibrating environment.
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