Filter for fluid scale
AssigneeEthicon, Inc.
InventorChristopher R. Clare
Life of this patent
Estimating the term…
Abstract
A device for weighing fluid includes a scale from which a fluid receptacle is suspended. Oscillations in the weight reading due to the pendulous motion of the receptacle are suppressed by a digital filter selected to have rejection notches at the frequencies of weight oscillation.
Claims20
A scale system for measuring the weight of an object, comprising:
- a support for holding the object;
- a transducer coupled to said support for converting a force exerted thereon by said object into an electrical signal;
- and
- a filter for receiving said electrical signal from said transducer and suppressing noise in said signal at selected frequencies.
A method of weighing a suspended object moving in periodic motion causing oscillations in the measured weight with a scale system having a support for holding the object to be weighed and a transducer coupled to said support for converting weighting force exerted thereon by said object into an electrical signal, comprising the steps of:
- (a) suspending the object on the support;
- (b) setting the object moving in periodic motion;
- (c) determining at least one frequency of oscillation in the electrical signal;
- and
- (d) selecting and applying a filter for receiving the electrical signal from the transducer and suppressing oscillations in the electrical signal at said at least one frequency determined in step (c).
Dependencies are inferred from the claim text.