Abstract: A semiconductor wafer metrology technique comprising performing atmospheric buoyancy compensated weighing of a wafer, in which the wafer is weighed in a substantially upright condition. A vertical or near vertical wafer orientation causes the surface area in the direction of a force (weight) sensor to be reduced compared with a horizontal wafer orientation. Hence, the electrostatic force components acting in the same direction as the wafer weight force component is reduced.

Abstract: A vehicle weighing system for counting the number of vehicle axles before and after weighing of an unloaded vehicle to determine if the unloaded vehicle is correctly positioned during weighing, as well as method for generating a scale ticket to record vehicle axle count data from the vehicle weighing system. Also, a scale ticket data system with a plurality of such scale tickets and a scale ticket electronic database which collects the scale tickets and identifies those scale tickets corresponding to unloaded and weighed vehicles which are correctly or incorrectly positioned during weighing, as well as a method for querying the scale ticket electronic database to identify those scale tickets corresponding to unloaded and weighed vehicles which are correctly or incorrectly positioned during weighing.

Abstract: An intermittent motion checkweigher for weighing products of interest. The checkweigher includes a product transport wheel having a plurality of product retention pockets, each of which retains one or more products of interest throughout the weighing operation. Products are loaded into a product retention pocket by an in-feed conveyor or similar device, after which the product transport wheel is indexed to advance the products in the product retention pocket toward one or more weighing devices where the products will be weighed while still located in the product retention pocket. After weighing, the products are advanced to a discharge conveyor or similar device by further indexing of the product transport wheel.

Abstract: A weighing apparatus having a load receiving element and a plurality of load cells directly or indirectly associated with the load receiving element such that when an object to be weighed is placed on the load receiving element, the weight of the object is unevenly applied to the load cells. The weighing apparatus includes load cells of different capacity based on the uneven loading applied thereto.

Abstract: The present invention relates to a System for automatic evaluation of preforms, characterized in that it provides an inspection system, to which preforms are supplied, a weighting system, downward the inspection system, and a selection system, downward the weighting system, said preforms being transferred from the inspection system to the weighting system with a set orientation.

Abstract: A method serves to optimize the behavior of an electronic force-measuring device, in particular a balance that comprises a measuring transducer through which a measuring signal is formed which is representative of a load applied to the force-measuring device, which measuring signal is delivered to a signal-processing unit that is supported by at least one processor and at least one memory storage unit and serves to process digital signals.

Abstract: Material delivery systems, methods of delivering material and methods of calibrating such systems and methods are disclosed. The material delivery system includes a delivery vessel, a load cell, and automated weight calibration device. The delivery vessel has at least an outlet adapted for coupling to an unit. The load cell is configured to provide a metric indicative of an amount of material in the delivery vessel. The automated weight calibration device is configured to impart a known force onto the at least one load cell. A method includes delivering material to a unit and determining how much material is delivered by a change in weight of a delivery vessel, wherein the delivery vessel comprises a load cell; applying a known calibration force to the load cell; and comparing a metric from the load cell of the known calibration with an expected metric.

Abstract: Baby scales include a housing, a weighing tray associated with the housing and configured to hold a baby, a display and a measuring device configured to support the weighing tray and to determine a weight of the baby. The measuring device includes an electric length measuring device configured to measure a length of the baby. The display is disposed on the housing and configured to show the determined weight of the baby.

Abstract: An interior space of the at least one housing of a force-measuring device is filled with a gas composition that is distinguishable in at least one parameter from the ambient atmosphere. A sensor that is arranged in the interior space, or on the housing, measures this distinguishable parameter. A processing unit of the force-measuring device compares signals obtained from the sensor to monitor and determine the condition of the force-measuring device.

Abstract: Systems and methods for reducing erroneous weighing of items such as by detecting items extending beyond a periphery of a weigh platter whereby in one configuration, the system employs a light guide for routing a light beam to a detector operative to detect interruption of the beam due to an item encroaching upon or overhanging an edge of the platter. In another configuration, the scale includes a perimeter gap between the platter outer edge and scanner housing frame or checkout counter, a light beam directed angularly upward through the gap is partially obstructed by the frame and platter whereby light exits the gap forming a light plane, wherein an object placed on the platter extending across the gap intersects the light plane thus scattering light rays, some of which are sensed by a detector. Various indicators for alerting the operator of off-scale detection are also described.

Abstract: A force measuring device, especially a weighing device, has at least one force-measuring module that includes a force-measuring cell, a communication means, a terminal and at least one communication line, through which communication signals are transmitted between the terminal and the communication means. In a method for determining the condition of such a device, at least one voltage present at the communication line or at the communication means is measured. The measured value, or a processed result therefrom, are transmitted through the communication line to the terminal. A parameter representing the condition of the force-measuring device is determined from the measurement value, or the processed result, in an accurate and simple manner.

Abstract: Weighing scales include at least one load cell, a weighing base configured to act on the at least one load cell and having a platform for a person, and a pillar having a pillar head disposed on the pillar, wherein a display device including an operating unit and a power source is disposed in the pillar head. The scales also have a measuring device for body-specific information and having at least one electrode, wherein the at least one electrode is disposed in at least one of the pillar head and a connecting piece between the pillar head and at least one of the weighing base, an associated frame and an associated base plate. A processor is included that is configured to process at least one signal measured from the at least one electrode.

Abstract: A biometric apparatus includes a weight measuring unit having a predetermined zero-point for measuring a load applied to a platform provided on a body of the biometric apparatus and outputting a load signal which indicates the load; a detecting unit for detecting the state of installation of the biometric apparatus and outputting a detection signal indicating the same; and a control unit connected to the weight measuring unit and the detecting unit for determining whether or not the state of installation is suitable for the zero-point reset of the weight measuring unit on the basis of the detection signal and whether or not the load signal is stabilized, and the zero-point reset is carried out when the control unit determines that the state of installation is suitable for carrying out the zero-point reset for the weight measuring unit and the load signal from the weight measuring unit is stable.

Abstract: A weighing scale that is calibratable without a calibration weight that is separate and distinct from the scale. The scale has a weighing mode and a self-calibration mode and includes a base that supports a load cell, which in turn supports a mass receiver. Electronic circuitry within the scale is configured so that, during the calibration mode, the sprung weight of the base when the scale is inverted and supported by the mass receiver can be used to calibrate the scale. This avoids the need to maintain a calibration weight external to the scale. A process of calibrating the scale includes inverting the scale during the self-calibration process and allowing the circuitry to acquire a calibration parameter that is based on the inverted sprung weight.

Abstract: A programmable weighing scale and a system and method for programming values of adjustable operating parameters used in generating the displayed output from the weighing scale. The weighing scale is placed into a restricted-access programming mode, which allows an authorized programmer to select values of operating parameters that allow the programmer to initially set or change the service characteristics of the scale. Operating parameters that can be varied include variables used in sampling the weighing scale's transducer electrical output, mathematically processing that output, and displaying the results. Once the operating parameter values have been selected, the weighing scale will utilize those values until the weighing scale undergoes a subsequent reprogramming.

Abstract: A manipulation device (5) for either securing a twist-lock to a shipping container or releasing it therefrom or both, the device (5) comprising engagement means (20) operative to engage and rotate at least a portion of the twist-lock so as to secure the twist-lock in the shipping container or to release it therefrom; a support member (15) disposed above the engagement means (20), the support member (15) being arranged to receive and support a mid region of the twist-lock whilst allowing a lower portion of the supported twist-lock to protect below the member to be engagable with the engagement means (20), said support member (15) being in the form of a plate incorporating at least one aperture allowing the lower portion of the supported twist-lock to protect below the plate; wherein said support member (15) is selectively movable out of alignment with an axis of rotation of the twist-lock.

Abstract: A measuring instrument for the gravimetric determination of moisture has a housing with a test compartment arranged in the housing, as well as a weighing device installed in the housing. The weighing device includes a sample receiver that is disposed inside the test compartment when in the measuring position. A radiation source arranged in the test compartment which during a test process serves to heat the sample placed on the sample receiver. A suction device, arranged adjacent to the test compartment, remove moisture and any other volatiles given off by the sample during the measurement process providing a more stable flow pattern in the test compartment.

Abstract: A top-pan scale with a scale pan which is supported on at least one force transducer (7) of a force measurement system (5) and with a corner load sensor which outputs a signal if the weighing goods are positioned eccentrically on the scale pan. The corner load sensor (10) has a flat underside via which it can be placed on, or attached to, the scale pan or a bottom pan of the scale. The corner load sensor also has a flat upper side on which a scale pan (4) can be placed or attached. The corner load sensor (10) is connected to a positionally fixed electronic processor (22) via a force-feedback-free connection (21). Embodiments of the corner load sensor can therefore be used for a wide variety of scale designs and can be retrofitted easily.

Abstract: An inventory monitoring system measures changes in weight of an inventory stored on one or more scales. The inventory items are divided into classes by weight, and the system determines the maximum number of items that can be in a combination while maintaining a distinct combined weight. Items are then removed or added, and the change in weight on the scales is correlated to a change in the number of inventory items to track the number of items removed or added over time. In a combined system, scanners are employed to track inventory received or sold, and data from the scanners relating to the items in the inventory is filtered out for comparison to the inventory changes indicated by changes in weight. The system has particular utility for monitoring inventories of cigarettes.

Abstract: A device that adds and removes a load of a built-in weight to and from a load measuring mechanism of a weighing apparatus built-in weight latched in a weight holder that performs a lifting and lowering operation to a fixed portion. During calibration, gas is supplied from a gas supply and exhaust portion to a bag to increase volume of the air bag. At this point, the weight holder is lowered against the repulsive force of a coil spring, and the built-in weight is latched in the load receiver, thereby performing the calibration. After the calibration, an electromagnetic valve is opened to exhaust the gas from the bag. As a result, the weight holder is lifted by the repulsive force of the coil spring, and the weighing apparatus enters a usual weighing mode.

Abstract: Packaging machine and discharging device for a packaging machine, and a method for filling bags by means of a packaging machine, wherein a bag to be filled is filled by means of a filling element and the filled bags are taken off by means of a bag take-off device and transferred to a discharging device. The discharging device comprises a conveying device for conveying off the bags filled with bulk goods, wherein at least one monitoring device for monitoring the tightness of the filled bags is provided which is associated with the conveying device. Said monitoring device comprises a weight sensor which captures a measure for the bulk material escaping from a bag to determine a parameter for the bag leakiness.

Abstract: A system and method detect when a product container from which a product is dispensed is empty or nearly empty, and provides a notification of the product status. The system includes a load cell that deflects at a first rate of distance per unit load when a load less than a critical load is positioned to be weighed by the load cell, and a load cell bracket positioned such that the free end of the load cell contacts the load cell bracket when a load substantially equal to or greater than the critical load is positioned to be weighed by the load cell. The load cell bracket may prevent the load cell from further deflection, or it may permit deflection of the load cell at a second rate of distance per unit load when the load cell is in contact with the load cell bracket.

Abstract: A hydraulic scale for planter calibration is disclosed. The hydraulic scale includes a tube having indicia disposed thereon. The tube has a substantially closed bottom and a substantially open top. The indicia disposed on the tube include at least one scale having a zero line. The tube is configured to float substantially upright when positioned in a liquid, such that the zero line is substantially aligned with the surface of the liquid. A non-zero line portion of the scale is configured to align with the surface of the liquid when at least one of seeds and feed are placed within the tube.

Abstract: A self-service checkout terminal includes a scanner and a weight scale. The customer passes each item past the scanner to identify the item and obtain weight data for that item from a centralized database, including a mean weight and a standard deviation. An error value is calculated from the measured weight of each item and the weight data. The error value of all items scanned during the common transaction are summed to produce an accumulated error for the particular weight scale during that transaction. This accumulated error is compared to a threshold value to determine whether a fault condition exists at the weight scale.

Abstract: A calibration weight arrangement (4, 104) for an electronic balance with a force-transmitting mechanism (1) has a calibration weight (3, 103) adapted to be coupled to the force-transmitting mechanism. The arrangement also has a transfer mechanism and a drive source to manipulate the calibration weight in a guided movement. The drive source includes an actuator (18) cooperating with the transfer mechanism and at least one piezoelectric element (19) which drives the movement of the actuator. The piezoelectric element interacts with a drive wheel (17, 117) that is centrally positioned relative to the calibration weight arrangement and drives a likewise centrally positioned shaft (16, 126). The interaction between the piezoelectric element and the drive wheel occurs during the advance movement in one direction through the repeated engagement and release of a frictional contact force.

Abstract: The calibration weight arrangement for an electronic balance with a force-transmitting device (1), includes a calibration weight (14) capable of coupling to the force-transmitting device (1). The calibration weight (14) is moved vertically by a transfer mechanism and a drive source to establish and to release the force-transmitting contact between the calibration weight (14) and the force-transmitting device (1). The transfer mechanism has at least one resetting element (22, 37, 38, 40, 43) and a lifting system configured as a knee joint linkage (17, 117, 217). The resetting element (22, 37, 38, 40, 43) and the lifting system work together to arrest and cushion the calibration weight (14) if the balance is shocked, dropped or hit.

Abstract: In a method for monitoring and/or determining the condition of a force-measuring device with at least one housing that has an interior space and with at least one force-measuring cell installed in the interior space of the at least one housing, at least one parameter of the atmospheric climate of the interior space is measured with at least one sensor that is arranged in the interior space of the housing or with at least one sensor that is arranged at the housing, wherein said parameter is of a kind that has an influence on the operating lifetime of the force-measuring cell; and a sensor signal corresponding to the measured parameter of the atmospheric climate of the interior space is transmitted to a computing unit and/or to a data output device.

Abstract: Described is a multi-optic scanner that can detect and/or measure weight placed on its vertical plate. In one embodiment, a portion of the vertical plate is positioned under a portion of a horizontal plate so that a force exerted on the vertical plate is transferred, whole or in part, to the horizontal plate. In alternate embodiments, one or more sensors are coupled to the vertical plate for detecting a force on the plate. The sensors can be coupled to an alert, such as an audible signal, to warn an operator of a misread weight.

Abstract: A calibration weight 100 for a gravimetric measuring instrument includes a calibration weight base module 101 which is equipped with at least one attachment area 106. The calibration weight 100 further has at least one positioning means 104 and at least one transfer element 105. The attachment area 106 allows supplemental weights 102 to be built onto the calibration weight base module 101; the positioning means 104 serves to position the calibration weight 100 in relation to the calibration weight arm 20; and the transfer element 105 serves as the place through which the transfer mechanism lever 31 applies its force and effects a transfer.

Abstract: A peak weight detecting system and method which analyzes signals generated by a load cell indicating a load within a container. The signal indicates a weight which is compared with a stored peak weight. If the new weight exceeds the stored weight, the new weight is verified by comparison to a weight indicated by a second signal from the load cell. If the weights indicated by the first and second signals are within a specified percentage of each other, the weight indicated by the first signal may displace the stored peak weight and may be stored as a new peak weight.

Abstract: A weighing apparatus calibration method uses a test mass, a material and a terminal to calculate and compare the total weight of the test mass and material to determine if the total capacity of the weighing apparatus has been calibrated. A system for managing calibration of a weighing apparatus is also described.

Abstract: A magnet unit includes a first magnetic pole (7a), a second magnetic pole (7b) and a third magnetic pole (7c) at a center between the first magnetic pole (7a) and the second magnetic pole (7b), providing an E-shaped configuration. In the magnet unit, a first magnet is defined between the first magnetic pole (7a) and the third magnetic pole (7c) by connecting two electromagnets (71aa, 73aa) with each other through a permanent magnet (72a), while a second magnet is defined between the second magnetic pole (7b) and the third magnetic pole (7c) by connecting two electromagnets (71ba, 73ba) with each other through a permanent magnet (72b). With this configuration, it is possible to reduce a deviation in the length of respective magnetic paths from the permanent magnets (72a, 72b) up to their respective magnetic poles. By controlling exciting currents to the respective magnetic poles.

Abstract: A force-measuring device (100) with at least one housing (20) has an interior space and at least one force-measuring cell (110) installed therein. At least one parameter characterizing an existing high-frequency electromagnetic field is determined by a sensor (50) arranged in the interior space or a sensor arranged outside of the housing, the sensor being adapted for detecting high-frequency electromagnetic fields. After an electromagnetic field is detected and compared to a threshold value, a response action of the force-measuring device is triggered if the detected parameter value exceeds the threshold value.

Abstract: A system and method for scanning goods and loading the goods into receptacles by a user includes a scanner and a plurality of loading stations. The scanner scans the goods, and the scanned goods are placed on the loading stations. Each loading station separately obtains a weight of the goods within each respective loading station. In response to each of the weights obtained by all of the plurality of loading stations exceeding a predetermined first weight, the self-checkout system is configured to initiate a first alarm detectable by the user, and in response to the first alarm being initiated, the self-checkout system is configured to prevent additional goods from being scanned by the scanner. In response to each of the weights obtained by all of the plurality of loading stations being below or substantially at a predetermined second weight, the self-checkout system is configured to allow additional goods to be scanned by the scanner after the first alarm is initiated.

Abstract: A method for determining the quantity of items in a container is described, where each item has the same nominal weight located between upper and lower weight limits. The method comprises the following steps: (a) attempting to pack a pre-determined quantity, n, of the items to the container, the predetermined quantity, n, being selected such that the product of (n+1) and the lower weight limit exceeds the product of n and the upper weight limit and such that the product of n and the lower weight limit exceeds the product of (n?1) and the upper weight limit; (b) measuring the weight of the actual quantity of items packed in the container in step (a); and, (c) dividing the value of the weight ascertained in step (b) by the nominal weight to determine the actual quantity of items packed in the container in step (a).

Abstract: In order to determine the dielectric constant of a layer deposited on a semiconductor wafer (2), the density of the layer is obtained. To obtain that density, the wafer (2) without the layer is weighed in a weighing chamber (4) in which a weighing pan (7) supports the wafer on a weighing balance. The weight of the wafer is determined taking into account the buoyancy exerted by the air on the wafer (2). Then the layer is deposited on the wafer (2) and the weighing operation repeated. Alternatively a reference wafer may be used. If the material of the layer is known, the weight of the layer can be used to derive its density using a thickness measurement. Alternatively, if the density is known, the thickness can be obtained.

Abstract: The present invention is directed to an apparatus and method for measuring the weight of material such as rock, earth, wood, pulp, grain, gravel, sand, ore, cement etc. being processed or moved by an apparatus such as a conveyor, apron conveyor or bucket elevator driven by an electrical motor. The apparatus measures the electrical energy consumed by the motor powering the apparatus during operation of the apparatus and uses a calibration formula derived from an average of no-load readings plus up to 2.0 standard deviations for converting the power consumption of the motor to tonnage per hour of raw material processed by the apparatus. A continual record is kept of all “No-load” and “start-up load” time during the recording process and these figures are totalized along with tonnage for the recording period.

Abstract: An electronic balance includes a sample plate for placing a sample, a load detecting unit for determining a weight of the sample, a sensitivity calibration mechanism having a calibration weight disposed under the sample plate for applying a load of the calibration weight to the load detecting unit, a weight holding member with a spring property for holding the calibration weight when the load of the calibration weight is not applied to the load detecting unit, and a pressing member disposed above the weight holding member for restricting an upper movement of the weight holding member. The load detecting unit converts a load of the sample placed on the sample plate into an electrical signal according to a sensitivity coefficient to determine the weight of the sample. The sensitivity coefficient is calibrated when the load of the calibration weight is applied to the load detecting unit.

Abstract: An apparatus is provided for measuring the weight force of a bale in a baler wherein the bale moves between a first position, within the baling chamber, and a second position, within a wrapping apparatus carried by the baler chassis. A measurement device, which is connected to a data processing device, is provided, for measuring a measurement parameter influenced by the weight force of said bale in each of said first and second positions and developing a signal representative of the weight of the bale at those positions. The processing device is set up to calculate the weight force of the bale taking into account a first signal output from the measurement device when the bale is in the first position and a second signal output from the measurement device when the bale is in the second position.

Abstract: It is an object of the present invention to provide a method of manufacturing a rotor for an electric motor, in which displacement of the center of gravity is prevented. According to a feature of the present invention, a rotor for an electric motor comprises an inner core fixed to a rotating shaft of the rotor and multiple coil units respectively fixed to the inner core, wherein the coil unit has an outer core, a bobbin and a winding wound on the bobbin, and wherein weight of outer cores as well as winding units (the bobbin and the winding wound thereon) is respectively measured and stratified into several groups, necessary number of the outer cores and winding units are respectively picked out from the same stratified group and then such outer cores and winding units are assembled to the inner core.

Abstract: A calibration assisting device includes a reference load data storage means 30d for storing, as a reference load data, the reference load data produced from load sensor 10 when a desired reduced quantity is generated in a vehicle weight measuring device 40, a load data fetching means 30a1 for fetching the load data produced from the load sensor 10, a tire load data fetching means 30a2 for fetching a tire load data produced from the vehicle weight measuring device 40, a reduced quantity detecting means 30a3 for detecting a reduced quantity on the basis of the tire load data thus fetched, a calibration information creating means 30a4 for creating calibration information on the basis of the load data fetched by the load data fetching means 30a1 corresponding to the tire load data and the reference load data stored in the reference load data storage means 30d when the reduced quantity is detected, and a calibration information outputting means 30a5 for outputting the calibration information produced from the cali

Abstract: A load cell type weight measuring device includes a load cell formed of a strain member provided with a plurality of strain gauges and deforming according to a load applied to a load receptacle. The load cell type weight measuring device converts an output of a Wheatstone bridge circuit formed of the respective strain gauges into a weight value to display. Two weight receptacles are attached to the strain member. It is arranged such that when a load is applied to one of the load receptacles, a strain at a portion of the strain member provided with the strain gauges becomes smaller than that when the load is applied to the other of the load receptacles.

Abstract: In order to determine the dielectric constant of a layer deposited on a semiconducotr wafer (2), the density of the layer is obtained. To obtain that density, the wafer (2) without the layer is weighed in a weighing chamber (4) in which a weighing pan (7) supports the wafer on a weighing balance. The weight of the wafer is determined taking into account the buoyancy exerted by the air on the wafer (2). Then the layer is deposited on the wafer (2) and the weighing operation repeated. Alternatively a reference wafer may be used. If the material of the layer is known, the weight of the layer can be used to derive its density using a thickness measurement. Alternatively, if the density is known, the thickness can be obtained.

Abstract: A balance includes a weighing cell with a vertically movable load receiver, a weighing pan to receive a weighing load, and a support element to couple the weighing pan to the vertically movable load receiver of the weighing cell. A cantilever arm with a seat for at least one calibration weight is solidly connected to the support element. The balance has a coupling arrangement that constrains the support element with low-friction mobility to the load receiver at three points forming a triangle in a plane that extends orthogonal to the symmetry plane of the weighing cell, wherein the triangle is symmetric to the symmetry plane of the weighing cell. Under the coupling arrangement, the support element is solidly supported on the load receiver in the direction in which the weighing load is acting.

Abstract: To provide a method with which one or more digital load cells of a load-receiving device can be replaced without the weighing system having to be newly calibrated, it is proposed that, in the event of a replacement, at least one of the previous load cells remains in the weighing system and in that, once the replacement has taken place, a new set of parameters is determined for the load cell used as the replacement via the central control unit on the basis of the data of the replaced load cell, which the control unit receives from the load cell remaining in the system, and is stored in the parameter memories of all the load cells.

Abstract: A method (10) permits determining the temperature in a magnetic resonance check weighing system (24) of a sample in a container (22) on a production line at the time of magnetic resonance testing. Method (10) includes the steps of determining a time-temperature correction factor for the sample in the container (50), measuring the temperature of the composite sample and the container at a time other than the time of magnetic resonance testing (70), and applying the correction factor to the temperature of the composite sample and container at a time other than the time of magnetic resonance testing (80).

Abstract: A scale including an event data discrimination and collection system for continuously monitoring a weight of an infant placed on the scale platen, which may be configured as a bed. Load cells are used to continuously monitor infant weight from time placed on the scale platen, so that sudden apparent weight spikes sensed by the load cells but attributable to events involved in patient care may be discarded as artifact, while gradual weight changes reflective of infant physiology are accumulated by the scale controller and used to provide a current weight for the infant.

Abstract: A weight set for an electronic balance has at least two different weights (15, 25, 26, 27, 28, 29) and a weight-receiving device (19) with receiving positions for each of the weights (15, 25, 26, 27, 28, 29). The weight set (2) has one lifter unit (17) per weight for the vertical movement of each individual weight (15, 25, 26, 27, 28, 29). The lifter units, which are equipped with a weight-seating device and reach through the weight-receiving device (19), are identical and are arranged parallel to each other in the weight set (2).

Abstract: An electronic weighing scale includes a body for use on a horizontal surface for a weighing operation, a display on the body for displaying a measured weight, and an electronic weighing circuit in the body for measuring the weight of a person standing on the body. The weighing circuit includes a zero-reset circuit for resetting the measurement to zero prior to a weighing operation. The body includes a zero-reset member incorporating an electrical switch operable by the zero-reset member to trigger the zero-reset circuit. The zero-reset member engages the surface, when the body is placed on the surface, for operating the switch to trigger the zero-reset circuit.

Abstract: An electronic balance includes a sample plate for placing a sample, a load detecting unit for determining a weight of the sample, a sensitivity calibration mechanism having a calibration weight disposed under the sample plate for applying a load of the calibration weight to the load detecting unit, a weight holding member with a spring property for holding the calibration weight when the load of the calibration weight is not applied to the load detecting unit, and a pressing member disposed above the weight holding member for restricting an upper movement of the weight holding member. The load detecting unit converts a load of the sample placed on the sample plate into an electrical signal according to a sensitivity coefficient to determine the weight of the sample. The sensitivity coefficient is calibrated when the load of the calibration weight is applied to the load detecting unit.