Abstract: A microcomputerized electronic balance has a digital filter which filters the output of a weight transducer in the balance. The filter changes the amount of filtering in response to the resolution of a display in the balance, the desires of the user of the balance as reflected by the state of a manual data entry means manipulated by the user, and the stability of the balance. Use of such filter results in a stable display of weight related data and good response time for the display.

Abstract: An electronic balance having a stored setup routine for defining scale operating parameters. An indicating device, which may be interchangeably connected to a plurality of weighing platforms, is responsive to an identifying connector to select from a memory operating parameters related to an operational characteristic of the weighing platform during the setup routine. A plurality of multi-function manually actuated buttons permit user selection of operating parameters during the setup routine. A sealable switch is used to restrict access to the setup routine. The balance operates in weighing or parts counting modes and can display weight in the parts counting mode. The balance can also provide a user with an indication of whether a dead-load or span adjustment is necessary.

Abstract: A toggle-type adjustment device is provided for allowing very fine adjustments of the position of at least one flexure mounting in a weighing scale.

Abstract: A differential spring mechanism is provided for allowing very fine adjustments of the position of at least one flexure mounting in a weighing scale. Most of the motion of a control device is absorbed by a first relatively weak spring, leaving only a relatively small portion of that motion to be absorbed by a second relatively strong spring to which the flexure mounting is connected.

Abstract: An apparatus and method for exciting a piezoelectric crystal resonator has an electric oscillator connected to a double ended tuning fork piezoelectric crystal so that it flexurally vibrates in air at its mechanical resonant frequency. A novel electrode pattern connects the oscillator to the crystal such that changes in humidity do not affect the resonant frequency of the crystal. This arrangement is useful in measuring force, such as weight.

Abstract: A transducer system for a weighing scale having a flexure mode crystal resonator includes a parallelogram linkage for supporting the load platform of the scale, a mounting structure for mounting the crystal resonator between two pivotally connected mounting arms, and a coupling assembly for coupling force from the parallelogram linkage to one arm of the mounting structure.

Abstract: An electronic balance having a strain gauge transducer. The analog output signal of the transducer is processed digitally so that the displayed weight is based on several successive digitized analog signal samples. Various operating parameters (e.g., conversion factors for several different units of weight) are stored in a non-volatile memory so that the scale can perform various weighing functions. The scale has a parts counter mode of operation requiring re-taring of the parts container whenever the scale is recalibrated for a different individual part weight.

Abstract: One or more computational parameters in a digital weighing scale can be varied by the user of the scale. The normal digital display of the scale is used to successively display a plurality of messages indicating the parameters or parameter values selectable by the user, and the user selects the desired parameter or parameter value by operating one of the normal scale controls during display of the message indicating the desired parameter or the desired parameter value.

Abstract: A powder measure device which includes a drum having two apertures and a metering piston assembly wherein the metering piston includes means for changing the diameter of the operative end of the metering piston. Thereby, only a single metering piston assembly is required and is operative with either bore of the drum. To insure a uniform discharge from the device, the device includes an adjustable baffle.

Abstract: A piezo-electric disc (e.g., a force transducer or a radio reference crystal) is mounted on its edge between two opposing anvils of material which is selected to plastically deform only under a relatively high proof load applied to the disc through the anvils while an extreme pressure lubricant is present between the edge of the disc and the anvils to provide seats of limited area for the edge of the disc.

Abstract: A balance beam type scale which is particularly adapted for educational purposes, i.e. for use by grammar school children. The components of the scale are easily assembled. Also, the scale is so constructed and arranged as to permit the weighing of a solid article, granulated materials or a liquid. Although the scale is ruggedly constructed for use by children, it includes features which have heretofore only been found in more expensive scales, for example a check lever.