886results about "Weighing apparatus testing/calibration" patented technology

A force measurement system having inertial compensation includes a force measurement assembly with at least one accelerometer configured to measure the acceleration thereof. According to one aspect of the invention, the force measurement system additionally includes at least one angular velocity sensor configured to measure the angular velocity of the force measurement assembly. According to another aspect of the invention, the force measurement system additionally includes a data processing device with a computer-readable medium loaded thereon that is configured to execute a calibration procedure for determining the inertial parameters of the force measurement assembly by utilizing the measured acceleration of the force measurement assembly while the force measurement assembly is subjected to a plurality of applied linear and/or rotational motion profiles. According to still another aspect of the invention, the at least one accelerometer is disposed on the force transducer.

An onboard system for determining the instantaneous weight and balance of an aircraft simply, reliably, accurately, and requiring a minimum amount of calibration includes a memory for storing previously determined breakout friction data of the aircraft's landing gear shock struts, sensors for sensing the pressures in the struts, the vertical loads exerted by the landing gear on the aircraft, and the attitude of the aircraft relative to the horizontal during loading or unloading thereof, and a computer for computing the vertical load in each of the landing gears from the stored calibration breakout friction data and the shock strut pressures, landing gear vertical loads and aircraft attitude sensed during the loading or unloading. The computer then computes the gross weight of the aircraft and the location of its center of gravity (CG) using the computed vertical loads in the landing gears.

Methods, apparatuses, and products are disclosed for session replication that include enqueueing sessions on a replication queue and flushing enqueued sessions, from the replication queue to a replication peer, in dependence upon flushing criteria, for storage on a replication medium. The replication medium may be non-volatile storage in a database or remote random access memory. Flushing may be carried out periodically or in dependence upon replication queue depth. Flushing may include aggregating sessions from the replication queue for transmission to the replication peer.

Apparatus and method for monitoring a prostate in a human body in which a fluid flows and which is characterized by a change in the prostate with time in space for the purpose of diagnosing a prostate condition, particularly cancer. A preselected place in the prostate is monitored to collect data at two or more time points correlated to a prostate event. The data is indicative of a prostate parameter that varies with time as a function of at least two variables related to prostate wash-in and wash-out behavior. A calibration map is made on a calculated basis with each pixel or voxel representative of a color hue indicative of wash-out behavior and a color intensity indicative of wash-in behavior. When a satisfactory map is obtained, the collected data is processed on the basis of the map to obtain an image of the preselected place with each spatial unit thereof correlated with a color hue and a color intensity. Software and a data processing system are provided to develop the calibration map. The calibration map and image of the preselected place are also novel implementations.

There is provided an abnormal device determining means (CPU 51) which reads a tendency of displacement between the combination calculated weight Wc of the contents M and the post-discharge Ws measured value of the same contents M measured after such contents M have been bagged and which, based on the tendency of displacement so read, determines which one of the combination calculated value Wc and the post-discharge measured value Ws is abnormal, and a display device (54) for displaying a result of the determination. Thus, since based on the displacement tendency of the combination calculated value Wc and the post-discharge measured value Ws, which one of the combination calculated value Wc and the post-discharge measured value Ws is abnormal is determined, it can readily and easily grasped which one of the combination weighing apparatus (1) and the weight checker (300) suffers from a trouble.

The invention is a method of measuring an apparent weight of a substance, while concurrently measuring a surface temperature of the substance and an ambient air temperature surrounding the substance, then predicting buoyancy forces acting upon the substance based on these temperature measurements. Thereafter, the true weight of the substance can be determined by correcting the apparent weight by the predicted buoyancy forces acting upon the substance.

The invention relates to a weighing method for an electronic belt scale capable of self-check, more than two weighing carrier rollers (3) form into a weighing device of the electronic belt scale, each weighing carrier roller is supported by more than two weighing sensors (5), each weighting sensor is respectively connected with a PLC (7) through an individual signal transmission line (8), the PLC can directly acquire an output weighing signal of each weighing sensor to monitor and diagnose each weighing carrier roller and weighing sensor on real-time in the weighing process. During a normal weighing, the method measures according to a multiple carrier roller mode. The PLC monitors, recognizes, diagnoses, groups and compares the weight signals after A/D transition on real-time, and calculates the material weight after integral arithmetic with speed signals of a motor or the belt. During thediagnosis, the weighing device treat according to more than two single carrier roller manners, and each weighing carrier roller is measuring cup for each other. The invention has strong ability of disturbance resistance, and can find out failures such as poor measuring accuracy, damaged weighing sensor, etc., the performance is stable and reliable, the failure point can be quickly checked out so as to be maintained conveniently, the maintenance capacity and component replacement quantity are in a small quantity.

The invention relates to a calibrator for a 3-way force sensor. Wherein, a X-way linear guideway for translating with a X-way loader and a Y-way linear guideway for translating with a Y-way loader are fixed perpendicular to each other on a calibrating worktable; the two ends of a beam are fixed on two ball screw for lifting the beam; the ball screws are installed vertically on the calibrating worktable; a Z-way loader is fixed on the beam; the standard force sensors that are respectively mounted on the X-, Y- and Z-way loader are intersected; an orientedly loading clamp clamps the 3-way force sensor to be calibrated, is placed on the calibrating worktable and located at the intersection of the three sensors; a motor drives the two ball screw for lifting the beam to move linearly and synchronously in Z direction. The weighing, 3-way force sensor is calibrated by a measurement comparison method. While detecting the force-measuring performance of the 3-way force sensor in any direction, one can observe the disturbance on the force measuring in another two directions, thereby the interference of forces in different directions can be reduced.

Weigh-in-motion (WIM) systems for weighing moving vehicles, the systems having the ability to automatically determine and periodically apply calibration factors to WIM scale readings. Auto-calibration may include transferring both WIM and static weight readings for the same vehicle to a database, associating the weight readings, collecting a number of such weight readings, and analyzing the differences between the WIM and static weight readings to calculate WIM scale calibration factors. The calibration factors may be based on vehicle characteristics such as vehicle weight, vehicle class and/or vehicle speed at the WIM scale.

A weight measurement system for automatically calibrating weight sensors installed on a motor vehicle seat. The system performs a calibrate operation whenever a valid weight measurement window is found. A valid weight measurement window is defined by the seat being empty, an associated door being open and an associated seat buckle being unlatched. The system operates in a factory install mode to establish a reference zero set value and in a diagnostic mode to establish a temporary zero set value that reflects drift of the weight sensors. The temporary zero set value is used by a weight management program to control occupant restraint devices. The weight sensor has an integral body with two lands connected by an elastomeric beam. The elastomeric beam has a pair of opposed surfaces that define a region of minimum thickness and one or more regions of maximum thickness. A resistive strain gauge element is disposed on the region of minimum thickness. The system measures changes in the resistance of the weight sensor caused by weight of the seat.

The invention discloses a free-combination automatic-weight adding device, which is used for automatic weight adding in the pressure detection field. The device comprises a group of cylindrical weights (6) arranged in a sleeving mode, and the upper end of each weight layer (6) is provided with a driving mechanism for driving the weight (6) to move up and down; and a weight tray (8) with a weighing or pressure detection mechanism additionally provided is arranged below the weight (6). Heights of the weights (6) are sequentially decreased from inside to outside, a supporting groove (41) is arranged in the exposed column surface of the upper end of each weight, and supporting rods, an inner ring (13), a middle ring (14) and an outer ring (15) are correspondingly arranged. The free-combination automatic-weight adding device is used in the pressure detection or weighing system, free combination and automatic weight adding of the weight adding operation can be realized, the operation is convenient, and weight adding is accurate.

A load sensor hardly causing error in weight measurement even when the environmental temperature of the load sensor varies, and a seat weight measuring apparatus using the load sensor. The sensor includes a plurality of strain gauges form a bridge circuit. The strain gauges forming the bridge circuit are attached to the front and back surfaces of a base plate at substantially the same location. Portions of a flexible substrate, on which the strain gauges are formed, are folded and adhered to the back of the sensor plate with adhesive. The bridge circuit formed by the strain gauges compensates for the variation in resistance among the strain gauges generated due to the temperature distribution of the base plate, resulting in little or no variation in output.

A measuring apparatus, for instance an analytical balance, can set parameter values for performing specific measuring tasks and/or for effecting communication with an operating person. Sets of such parameter values are stored as profiles. The measuring apparatus is equipped with a recognition device, for recognizing an operating person and activating a stored profile assigned to that person.

A method and system for correcting for the inertial error of a transducer as a function of frequency or effective mass coupling.

The invention provides a method for calibrating an electronic belt scale. The method comprises the following steps of: making preparation for calibration, namely cleaning and adjusting the electronic belt scale, adjusting a pressure sensor and calibrating a tare value; on the condition that the electronic belt scale operates normally, obtaining the weighed value of a material of which the actual weight is known, and determining a scale error valve according to the actual weight and the weighed valve of the material; repeating the above measuring step so as to obtain multiple scale error values and determining an average scale error value according to the multiple scale error values; and determining a new weighed value correction factor according to the average scale error valve and an original weighed value correction factor and calibrating the electronic belt scale. The method is simple and has an obvious effect; and the calibrated electronic belt scale has high measurement accuracy and can be used for weighing large granular materials.

A device for monitoring an operating condition is incorporated in a balance with a weighing cell, an electronic weighing circuit arrangement (15), an output unit (21, 22, 44), and at least one electronic inclination sensor (13). The circuit arrangement (15) includes a signal-processing device (17), a memory device (19) as well as a time clock (20). Based on a sensor signal received from the electronic inclination sensor (13), the signal-processing device (17) determines a quantity that is indicative of the operating condition of the balance. The signal-processing device (17) also determines the current time and assigns a time value to the quantity that represents the operating condition. The resultant vector-like sets of time and operating condition data are transmitted to and stored in the memory device (19), so that the data are at all times available for transmission to an output unit (21, 22, 44).

The invention disclosed consists of weighing apparatus and process that includes a new Calibration management utility to automate compliance testing to ISO 9000 requirements and has the "load cell symmetry", "empty platform" and "test load" readings for each load stored on the weighing apparatus. This weighing apparatus makes periodic tests to determine the health of the load cells in the system, producing a log file to record events such as any detected failure, any suspicious reading, overload condition, or any user defined parameter, and is network enabled to be connected through a LAN via an Ethernet to the Internet

A pressure sensor that is implantable within a living being that wirelessly provides pressure data within the living being to a wireless receiver. The pressure sensor includes an elastic membrane to which at least one capacitive actuator is coupled for applying a known force to the membrane to determine membrane characteristics. The pressure sensor includes a force transducer contacting the membrane for determining the pressure within the living being and which includes an internal calibrating force mechanism. This calibrating force mechanism permits force transducer displacement away from the membrane where a zero force transducer reading is taken and then applying a calibrating force and taking another reading. From these two points, a force transducer characteristic is derived and, along with membrane characteristics, an accurate pressure within the living being is obtained from the sensor. An alternative embodiment replaces the capacitive actuators with a known mass and an external vibratory source.

The invention provides a calibration device of a large weighing apparatus. The calibration device comprises calibration units and a base, wherein the number of the calibration unit is at least accordant with that of weighing sensors of the calibrated weighing apparatus; the base is used for supporting each calibration unit; a foundation pit used for accommodating the calibrated weighing apparatus is arranged on the base; base pre-burying boards are respectively arranged on the bases which are arranged on the two sides of the foundation pit; each calibration unit comprises a pedestal fixedly arranged on the base pre-burying boards, a force applying oil cylinder, a cantilever beam with a fixed end and a free end, a force sensor and a ball head pressing block; a bearing board is arranged on a weighing platform of the calibrated weighing apparatus; the force sensor is arranged on a piston of the force applying oil cylinder; the fixed end of the cantilever beam is fixedly arranged on the pedestal; and the free end of the cantilever beam is positioned above a ball head bearing pad and is contacted with the ball head bearing pad. The calibration device has the advantages that the working efficiency and the security of the large weighing apparatus are highly improved, the cost is saved and the structure is simple.

WEIGHNTEL is a weighing device, a scale that is capable of automatic instantaneous wireless transmission of recorded weights that are packaged or associated with other data as identification, date, and time. This is wireless transmission of a recorded weight and other business related data, of objects including living beings, to any location on earth or in outer space. Using existing technology a scale can be manufactured to accomplish electronic transmission of weights after recording them with account ID, date and time on a computer disc. Digital scales may be used and preferred over other traditional scales. Objects to be weighed vary from tiny objects such as jewelry, postal items, to human beings, pets and animals, cargo in seaports, airports, and rail stations or to be loaded on commercial or military trucks or other transportation vehicles. Weighing cargo in this innovative manner can help to safeguard against illegal interventions over time or space. Weighing human beings can help to generate a more accurate and meaningful weight record, or weight history from birth to end of life, or from any point of beginning to termination of the account. Adding a global locator feature could be of unimaginable security value especially if the devices are globally marketed. Adding a camera or video camera would perhaps be a luxury that increases the cost of production but also enhances security. Adding sensors such as a scanning device can help to pick a unit ID and include it with data to be transferred. The device could be programmed to make automatic corrections to weights that are influenced by geography in locations that alter the gravity effect. [e.g. a weight on earth is 6 times that on the moon]. Either the transmitter and receiver ends can be portable mobile or they can be stationary i.e. a scale can be small and portable or huge and fixed to a location. A receiver can be a portable hand held device, a telephone or a stationary computer or a laptop. Transmission is basically performed by an electronic transmission device in a manner similar to TCP/IP packet transmission or email transmission between two ends or computers. Wireless data transmission happens from scale to a location on the Internet, Intranet or any receiver device and vice versa using end to end wireless data transmission protocol. Every transmitting device within a scale is programmed for a specific goal that is defined by the type of business involved. Every receiver device and each software program is built for a specific goal that is defined by the type of business involved. At the receiver end transmitted data are automatically entered into the account ID file. Data are further processed to produce a graph or a table or both showing the details of the transaction and relation to prior transactions. A printable file shows weight progress from the date of subscription to the account to the date of the last transaction. With each transaction a new updated file is produced without deleting previous records.

A system for measuring the weight of a seat occupant is used to control airbag deployment. The system includes a seat bottom that receives a vertical seat occupant weight force. The seat is divided into four quadrants, a front right quadrant, a left front quadrant, a left rear quadrant, and a right rear quadrant. Each quadrant includes a sensor that generates a weight signal corresponding in magnitude to the seat occupant weight in the respective quadrant. Each weight signal is comprised of a vertical force component and an error component induced by braking or deceleration forces acting on the seat bottom in a non-vertical direction. The sensors are orientated within their respective quadrants such that two sensors generate a positive error reading and two sensors generate a negative error reading. When the weight signals from each quadrant are added together to determine the total seat occupant weight, the error is eliminated as the positive and negative error components cancel each other out. The seat occupant weight is determined by adding the vertical force components from each of the weight signals together.

A measuring device including a sensor that generates data representing a detected body parameter, such as body fat, body water and weight of an individual. A portable device removably connected to the measuring device for receiving, displaying and storing the data representing the detected body parameter. The portable device may correlate the stored data with an individual user. The portable device is responsive to a personal computer for uploading the stored information thereto.

The invention provides a method and system for checking precision of an electronic belt scale. The method comprises the following steps: in the process of balancing the scale with a standard code, collecting data containing scale frame length and weight and a belt speed by each electronic belt scale according to the principle of intra-group instant sampling and inter-group multiple sampling; according to the collected data and a preset flow of each feeding device, calculating basic data Y required by the precision check according to the following formula; calculating the ratio of an intra-group range average value to an inter-group range average value of the basic data; and comparing the calculated ratio with a preset threshold value so as to determine whether to repeat the precision check or end the precision check, wherein the formula is that Y=1-sigma{[(the actual flow i/the preset flow i-1)2]1/2*( the preset flow/a preset total flow)}*100%. By using the method, the existing problem that an enterprise can only check the accuracy of the online electronic belt scale but cannot check the precision is solved. The invention provides a convenient method for checking precision.

A scale for determining a quantity of material in a container such as a keg. The may include a support member configured to be placed under a portion of the container, a display to indicate the quantity of material in the container, and a weight sensor positioned underneath the support member to determine the quantity of material in the container and to provide a signal to the display.

The invention discloses a tracking testing system of the resonant frequency of a quartz crystal microbalance and a method thereof, the tracking testing system comprises an analog circuit testing network and is characterized in that the tracking testing system further comprises a digital frequency synthesizer, a homologous frequency multiplication signal generation module, a high-speed analog-digital converter ADC, a signal processing module and a feedback tracking module, wherein the high-speed analog-digital converter ADC is used for generating a frequency multiplication signal which is homologous with a driving signal and has the frequency of 4/(2N plus 1); a voltage signal outputted by a sampling module is amplified by an operational amplifier and then directly enters into the high-speed analog-digital converter ADC for carrying out conversion and output; the signal processing module is used for calculating the serial complex admittance of a QCM chip according to Kirchhoff laws, and approximately calculating the difference between the current frequency and the series resonant frequency of the QCM and the serial impedance of the chip; and the feedback tracking module is used for changing the output frequency of the digital frequency synthesizer, leading the output frequency to approximate the serial resonant frequency of the QCM, and repeating the implementation for realizing the tracking of the serial resonant frequency of the QCM.

The present invention may be said to consist in a method of determining weight of a payload lifted by a rig of a load lifting machine, and/or a apparatus 21 system the weight being determined from at least one parameter being or indicative of the force or pressure existing in or applied by the rig while the payload is lifted and a compensation for friction and/or other losses in the rig 14.

The present invention provides a method and apparatus configured to perform relative load compensation for a payload measurement system of a machine. The machine has at least one cylinder for elevating a payload carrier. The cylinder is connected to a fluid circuit having an actuating fluid. The payload measurement system is calibrated. Then a load of unknown weight is lifted. To determine the weight of this load, the system determines an uncompensated payload weight as a function of sensed pressure values of the actuating fluid. Temperature of the actuating fluid is sensed at the time of calibration and at a time of lift and the difference is scaled. A payload weight is determined as a function of the scaled temperature and the uncompensated payload weight.

A weighing sensor including a base (1) fixed to a housing, a load sensor (2) connected to the base in a displaceable manner via two arms (3, 4), a lever system (8 . . . 11) having at least one lever and transmitting the load acting on the load sensor to a transducer (12, 13), and a built-in calibration weight (40) which may be lowered onto a support region (30/38) for checking and/or calibrating the sensitivity of the weighing sensor. The support region is guided in a parallel manner by two additional arms (21, 22) and is connected to a lever (9/39) of the lever system (8 . . . 11) via a coupling element (26). Relatively large loads on the weighing sensor may be simulated with relatively small calibration weights, without the need for complicated lifting devices. The two additional arms (21, 22) are connected on the one hand to the support region (30/38) and on the other hand to the load sensor (2) and are located on the side of the load sensor (2) opposite from the lever system (8 . . . 11).

A method (51) for measuring the mass of an object such as a letter (10) in motion. An apparatus (12) for carrying out the present invention includes a pair of rollers (16, 18) through which a letter passes. One of the rollers (16) is driven by a motor (20) which has an associated encoder (22) to give motor positional information to a controller (24). In a method of the present invention the controller generates a ramping torque signal (44) which is provided to the motor. A friction correction curve (40) is generated and applied to the torque signal, and an average torque value (C) is determined. From the positional information provided by the encoder, acceleration (50) is derived and an inertia value is obtained by dividing the average torque (C) by the acceleration. Prior to obtaining an inertia value with a letter, an initial inertia value is obtained without a letter to get a base inertia. The base inertia is subtracted from the measured inertia with a letter to get a difference Δl. The mass (M) of the letter is obtained using the formula Δl=1/2M r², where r is the radius of the driven roller.

The present invention discloses a method for the self-testing of electronic belt weighing in a real-time and online way. A real-time online self-testing device is employed in implementation, the self-testing device comprises a PLC, a weighing type pressure material level meter arranged on a storage bin and an electronic belt scale under the storage bin. The electronic belt scale comprises an electronic belt and a weighing instrument arranged in the electronic belt. The method comprises the following steps that when the storage bin is not fed, the weighing type pressure material level meter detects the weight change signal of the material in the material bin in the process of outputting the material, the material conveying amount signal of the electronic belt scale is detected through the weighing instrument arranged in the electronic belt, through transmitting the weighing value of the material weight change signal in the storage bin and the weighing value of material conveying amount signal of the electronic belt scale to the PLC respectively, whether the weighing transmission of the electronic belt scale is in a correct accuracy range is judged. According to the method, the electronic belt scale weighing accuracy can be monitored in an online and real-time way and improved.