Abstract: A method and apparatus for controlling the zero adjustment of weight sensors adapted to measure the weight of articles. A zero adjustment control operation performed by the method and apparatus of the invention is executed by (1) discriminating whether the zero point deviation of each weight sensor lies within preset allowed limits, (2) applying a zero adjustment to each weight sensor when the zero point deviation thereof lies with the allowed limits and generating a signal for inhibiting the zero adjustment when the zero point deviation lies outside of the allowed limits, (3) counting the number of times the zero adjustment inhibit signal is generated, and (4) comparing the counted value with a predetermined value to produce an alarm signal when the counted value and predetermined value coincide, whereby the zero adjustment of the weight sensor is controlled.

Abstract: A method is disclosed for calibrating a bulk material weighing and metering conveyor of the endless belt type providing a variable frequency signal indicative of feed rate. In such a conveyor system, a belt speed signal and a tare-adjusted weight signal are multiplied to provide a product signal that is converted into a periodic pulse signal whose frequency indicates the feed rate (net weight per unit of time) of the material being metered by the conveyor. In a first calibration step, the weight of the empty conveyor belt is measured over one belt revolution by counting the periods of the feed rate indicative pulse signal. This count is then used to establish a tare weight reference value. With the tare weight reference value established and the feed rate signal compensated therefor, a second calibration step is performed wherein the periods of the feed rate indicative pulse signal are again counted for a known increment of belt travel with a known net weight of material for such increment of belt.

Abstract: A combinatorial weighing method and apparatus therefor, the apparatus being of the type which includes a plurality of buckets for carrying articles to be weighed, a conveyor for conveying each of the buckets, and a weight sensor for sensing the weight of each bucket. The method includes steps of storing in memory the empty weight of each bucket following the measurement thereof by the weight sensor, storing in memory the total weight of each bucket and the articles introduced into the bucket, the total weight being measured by the weight sensor, finding the weight of the articles in each bucket by subtracting from the total weight of the bucket and its articles the empty weight of the bucket, selecting, on the basis of weights of the articles, the combination of articles whose overall weight is equal or closest to a preset target weight, and releasing the selected articles from the buckets which carry them.

Abstract: A zero tracking circuit (32) monitors the output of an electronic scale employing a dual slope integrating type analog-to-digital converter (20) to detect low magnitude output signal levels characteristic of drift and other low level noise. The converter (20) samples the magnitude of an input analog signal proportional to applied weight and in response controls a count accumulated in a resettable up/down counter (36). The counter (36) is manually reset to provide tare, that is, to provide a zero reading with an applied weight. The output of the counter (36) is supplied to a digital display (40a-40d) that displays changes in applied weight. The zero tracking circuit (32) includes a decoder (56) that monitors the output of the counter (36) and in response to low magnitude counts characteristic of drift, e.g., one count on each side of zero, resets the counter (36) to eliminate the drift.

Abstract: The invention describes a method for checking the weight of consignments assembled in containers, where the net weight of a container is measured during the passage and transmitted to a consignment computer, the weight of the container filled with the articles of this consignment is also measured in the passage and transmitted to the computer, which ascertains the difference of the two weights as the actual weight of the consignment and compares it against the fed-in nominal weight of the consignment in question, whereupon in case of a deviation of the actual weight from the nominal weight above a predetermined tolerance boundary the container in question is sorted out.

Abstract: The plurality of selector buttons or keys previously required for selecting a mode or parameter in an electrical scale is replaced by a single key. Depression of the key causes each of the available modes and/or parameters to be selected in sequence. The title of the then-present mode or parameter is displayed. When the desired mode or parameter has been reached the operator releases the key. Submodes or ranges within a given parameter are set by short depression of the key. The sequencing is controlled by a microcomputer. Jumpers may be provided so that certain modes or parameters are eliminated from the sequence for a given application.

Abstract: Unmanned apparatus for collecting scrap aluminum cans and for compensating depositors of scrap aluminum cans based on the weight of the aluminum cans deposited including a microprocessor control structure which produces control signals to control the operation of the apparatus including the dispensing of compensation, calibrating the weighing structure, and in response to alarm signals produced by operating components of the apparatus, to display the existence of any such alarm conditions, to identify their source and to deenergize the apparatus until the alarm causing conditions are corrected.

Abstract: A track working or transport vehicle comprises a frame and two undercarriages supporting the frame. Springs are mounted between the side frames of the undercarriages and the vehicle frame, the springs having a stroke whose length is proportional to variable loads distributed to a respective undercarriage wheel from the vehicle frame. A displacement pickup is connected to each group of springs and arranged to measure the stroke thereof, the pickup generating an electrical output signal proportional to the measured stroke. An arrangement for continuously monitoring and indicating the loads distributed to the respective wheels includes a summation circuit having a first input receiving the output signals from the pickups, a second input received fixed electrical signals proportional to the weight of non-yieldingly mounted parts of the undercarriages, and an output transmitting electrical output signals proportional to the wheel loads derived from the inputs.

Abstract: Disclosed is a system and method for the high-speed, cyclic batch weighing of a flowable material in which variations in initial scale weight are automatically compensated for. Measuring cycle time is minimized by overlapping the time required to achieve scale stability prior to tare with the material discharge time. Tare weight is automatically measured during a weighing cycle following material discharge while the weight container is open to provide a residue compensation output signal.

Abstract: In an automatic weighing apparatus wherein a weight measurement is performed by passing a commodity on a weighing conveyor which is coupled so as to become a load of a load cell, and a label on which data based on the measured value are printed is automatically stuck to the commodity, while a print fixing label in which a print content is fixed can also be issued; the zero-point setting is automatically performed at times when the commodity does not exist on the weighing conveyor, so as to execute in a stable state a measurement having an accurate reference point.

Abstract: The key provided for manual operations of the functioning of an electrical scale is constituted by an elongated bar which rests on two control switches. The control switches are connected to the control circuit of the scale so that activation of either one will result in the furnishing of the same control signal to the control circuit. The location of force applied to the activating member is immaterial, since no matter where the bar is touched, one or both of the switches will be depressed. This permits the operator to control the functioning of the scale without moving his eyes from the display.

Abstract: Weighing apparatus for determining the tare and net weights of a container containing a liquid or a substance behaving like a liquid without requiring separate weighing of the empty container or its contents including apparatus for applying force to the container whereby force interactions between the liquid and the container are negligible for at least a predetermined measuring duration; and apparatus for sensing characteristics of the force applied to the container and of the motion of the container at the measuring duration for determining the tare weight of the container.

Abstract: A weighpan is controlled by a microprocessor to tare itself between successive weighings and the microprocessor resets the weight at which supply to the weighpan is regulated in accordance with a shortfall or excess delivered on previous weighings.

Abstract: A combination weighing machine, which is typically used for packing a plurality of articles in each bag or the like, including a plurality of weighing balances for weighing a plurality of articles each at the same time, and arithmetic means for selecting some of these weighing balances so that the total weight of the articles thereon falls within a predetermined allowable range, the machine also includes zero-point correction means arranged such that, by applying a zero-point correction command signal from the outside, the loading operation of a selected balance is inhibited and, after the unloading operation, this balance is left vacant, and that, under such condition, the weight signal output from this balance is cancelled or nullified prior to arrival at the arithmetic means.

Abstract: In a scale having a digital display, the available weight range, that is the difference between the maximum allowable weight on the scale and the then-present weight on the scale, is displayed in response to activation of the tare key. The available weight range number may be displayed for a predetermined time interval or it may be displayed while the tare key is depressed, release of the tare key causing the normal display of net weight to resume.

Abstract: A dynamic weighing system for vehicles in motion which is specially adapted for weighing a plurality of coupled railroad cars of varying length randomly interspersed in a continuous coupled train. The system is adapted to automatically weigh and record each individual car in the train without the necessity of special grade slopes, special decoupling devices, mechanical switches, special positioning measurements, special axle measurements and counting and systems to screen out unwanted noises from irregular car movement. The inventive system in a preferred embodiment will not register locomotives and cabooses. The preferred system utilizes preselected photocell sensor units in an arrangement keyed to the cross section bulk of each car. The shape of the cars interrupts photocell signals at predetermined points on a weigh bridge, thereby actuating means at the precise point when each car is at the optimum weighing position on a scale.

Abstract: A weighing scale with an electrical output includes a mechanical-to-electrical signal transducer which has a zero weight signal value which may vary in response to ambient conditions. The scale includes a fast acting switch operable to provide a switching function in response to the initiation of the placement of a weight upon the scale and a weight registering circuit operable in response to the switching function to register and store a zero weight signal before the signal transducer begins sensing the weight. The weight registering circuit is then operable to register the difference between the zero weight signal value and the ultimate signal from the transducer as the true weight.

Abstract: A weighing machine with a function key device and an electronic indicator, wherein the function key device comprises an electrically conductive contact sensor and a micro key device with a movable element arranged behind the contact surface and operatively connected therewith, so that manual pressure on the contact surface can operate the device either by electrical contact with the contact surface or by movement of the micro key device.

Abstract: A device for measuring sponges comprising, a measuring device for indicating the weight of an applied object, a retaining device applied to the measuring device for retaining a plurality of wetted sponges, and a determining device associated with the measuring device for determining the total weight of liquid in the retained sponges.

Abstract: Process and apparatus for weighing material being collected. In the illustrative embodiment, plasma that has been separated from whole blood is collected. The tare weight is sensed and the weight of the material being collected is sensed. Pulses are provided in frequency proportion to the sensed weight. The tare weight pulses are counted and stored. A net weight counter is set with a predetermined count corresponding to the maximum amount of plasma to be collected. A measure weight signal reverses the tare weight count with the net weight counter being inhibited until the tare weight count reversal has been completed. Once the tare weight count reversal is completed, the net weight counter is operative to count the sensed weight pulses. A completion signal is provided when the predetermined count has been decremented to zero.

Abstract: Cars of a multi-car train are loaded while in transit utilizing an overhead loading hopper into which a load out conveyor delivers bulk material such as coal in quantums to fully and evenly fill the individual receiving cars as each passes beneath the hopper and each quantum of material delivered to the hopper is specially measured to equal the predetermined gross loaded weight of the car in loading position less the car's actual weight as it was measured in transit. Loading of each car from the hopper is regulated by the speed of the conveyor and by an operator controlled diverter gate which initially directs the coal through an aft chute of the hopper which each car reaches first and then through a fore chute to complete its loading.

Abstract: This invention concerns a weighing device to measure the weight of a sample of powder supplied by a suitable feed-mechanism.This weighing device comprises at least one sample-holder vessel and a taring vessel, connected to a transfer mechanism which moves the sample-holder vessel from a filling position where it is directly under the feed-mechanism, to receive the sample, to an emptying position, and which also sets the taring vessel and the vessel containing the sample on a weighing mechanism in turn, to measure their weight.The invention concerns this weighing device and an installation comprising such a device, used in particular for volumetric analysis of a sample of powder, such as raw material for cement-making.

Abstract: An electronic counting scale, which may comprise a single relatively compact unit including all operable elements; or which may be based upon a modular construction including, firstly, an electronics unit which includes all basic electronic circuitry necessary to operation; and, secondly, a base unit. The base unit in the modular construction, includes the load cell, associated mechanical linkage, the weight receiving platform, and the like. It is adapted to directly receive the electronics unit, and includes connector means for enabling electrical interconnection with the electronics unit, and means for mechanically coupling the base unit to the electronics unit. The load cell is a parallelogram-type flexure frame, and is characterized by four strain gauges, which are located at the upper and lower surfaces of two vertically overlying flexure corners of the parallelogram. This arrangement--because of symmetry considerations--is uniquely free of second-order errors generated by offset loading.

Abstract: A digital weigh feeder includes a conveyor belt for transporting material thereon. The conveyor belt has an average tare weight. A digital weight transmitter provides at least first and second outputs having first and second frequencies respectively. The ratio of the first and second frequencies is indicative of the weight of material on the belt. A weight processor digitally computes a scaled ratio of the first and second frequencies. An auto tare circuit digitally computes the average tare weight of the conveyor belt. The computed average tare weight is substracted from the computed scaled ratio of the first and second frequencies to obtain a reading of the actual weight of material on the belt.

Abstract: An improved weighing apparatus of the electromagnetic compensation type is disclosed including at least one ferromagnetic member connected with the load-receiving system for reacting with the permanent magnetic field of the apparatus to compensate for the dead-load forces which act on the load-receiving system. Preferably the ferromagnetic members are connected with the coil carrier member in circumferentially spaced relation about the axis of the load receiver member. The permanent magnet which produces the magnetic field and the ferromagnetic members preferably have generally mutually-compensating temperature coefficients of magnetic performance.

Abstract: In an object weighing system, apparatus for automatically adjusting the zero-reference value of a weight-representing signal to a desired value equal to that signal level which would produce an indication of zero weight by the system. To accomplish this, the absolute value of the signal is detected and applied to a voltage-to-frequency converter, the pulses from which are counted in an up/down binary counter only when no object is being weighed; the direction of count is controlled by a polarity-representing signal applied to the voltage-to-frequency converter. The instantaneous running count in the counter is applied to a digital-to-analog converter, to produce a correction signal of substantially the same magnitude as the amount by which the zero-reference value departs from said desired value. This correction signal is combined with the unadjusted weight-representing signal in the polarity to drive the zero-reference value toward said desired value.

Abstract: The pan assembly of a top-loading balance consists of a base attached to a pan carrier for joint movement in a vertically extending direction relative to a support on which the carrier is mounted. A sensible signal is generated in response to the presence of an object to be weighed on the pan assembly which, according to the invention, includes a cover spacedly superposed on the base and having a horizontally extending, exposed top face for receiving the object. One or more compensating weights are releasably interposed between the cover and base in weight transmitting relationship, the cover, the weights, and the base being closely similar in configuration when viewed from above and releasably secured to each other by interengaged projections and recesses.

Abstract: An electronic weighing apparatus includes a scale mechanism having a weighing plate for placing thereon an article to be weighed in a package the latter constitutes a tare weight. A slit plate is movably associated with the weight of said article on said weighing plate and has a series of slots equally spaced in the moving direction. A light source is provided at one side of said slit plate. A photodetector is provided at the other side of said slit plate opposite to said light source, whereby a pulse train is generated from said photodetector. The number of pulses in the pulse train is associated with the movement of the slit plate and thus with the weight of said article. A counter for counting the number of pulses of said pulse train provides the weight value and a display displays the weight value in said counter. A balanced state detecting circuit detects that the weighing plate has reached a balanced state.

Abstract: An electronic tare system used in an electrical balance of the type which generates an electrical signal representing a mass being weighed for application to a digital read out or other display is capable of bipolar operation over a range much greater than that of the balance by generating and storing a digital value in response to the combined analog signals at an electrical summing junction coupled to receive both the electrical signal from the balance and an analog electrical signal generated from the stored digital value. An up-down counter coupled through a digital-to-analog converter to the summing junction counts in response to the output of a high gain amplifier coupled in a feedback loop to the output of the summing junction during the first portion of a tare mode of operation until the output of the digital-to-analog converter to the summing junction effectively equals and nulls the signal from the balance.

Abstract: Electrical weighing apparatus is disclosed for weighing load components added successively to a load receiver, including a transducer for producing pulses the number of which corresponds with the weight applied to the load receiver, a counter for counting the pulses, a first storage device associated with the counter for storing counts corresponding to the receiver dead-load and containing tare weights, and a display device for displaying the difference between the counts of the counter and the first storage device, characterized by the provision of a second storage device for storing at least those counts corresponding to the weight of one or more components added to the load receiver. In one embodiment, a pair of counters are provided each having its own storage device, and in other embodiments, a single counter is provided in conjunction with a pair of selectively operable storage devices.

Abstract: An electronic weighing apparatus, comprising: a scale mechanism having a weighing plate for placing an article being weighed, a slit plate provided to be moved associated with the weight of said article on said weighing plate and having a series of slit equally spaced in the moving direction, a light source provided at one side of said slit plate, a photodetector provided at the other side of said slit plate opposite to said light source, whereby a pulse train is generated from said photodetector the number of which pulses is associated with the movement of the slit plate and thus with the weight of said article, a counter for counting the number of pulses of said pulse train for providing the weight value, a display for displaying the weight value in said counter, a zero point detecting circuit for detecting the weighing plate having returned to the zero point, a balanced state detecting circuit for detecting said weighing plate having reached a balanced state, a measurement start switch, a first AND gate re

Abstract: An electronic weighing apparatus, comprising: a scale mechanism having a weighing plate for placing an article being weighed, said article having a net weight and including a packing having a tare weight, a pulse train generator operatively coupled to said weighing plate for generating a pulse train the number of which is associated with the weight of said article, a counter for counting the number of pulses of said pulse train for providing a weight value signal, a shift register responsive to said counter for storing the weight value signal in said counter, a tare weight display for displaying the weight value stored in said shift register, a net weight display responsive to said counter for displaying the weight value in said counter, a key board for setting the unit price of said thing, an operation circuit responsive to said key board and counter for making a multiplying operation of said unit price by said weight value in said counter for evaluating the price of said thing, a price display for displayin

Abstract: Electromagnetically compensating weighing or dynamometer apparatus in which coil moves out of an equilibrium position relative to a magnet under the influence of a force, including a compensating circuit providing a compensation current proportional to the amplitude of the deflection, an a taring arrangement comprising a store and a digital/analog converter connected to the coil in parallel to the compensation circuit.

Abstract: Apparatus for generating a belt tare compensation signal including a load cell in operative contact with a feed conveyor belt dividable into N equal segments. The output of the load cell is strobed each time the conveyor belt advances one sampled and a pulse train representative of the output of the load cell is generated. The pulse train is applied to a pulse counter if the output of the load cell is greater than a predetermined value and is applied to a minus counter if the output of the load cell is less than a predetermined value. At the end of a single revolution of the conveyor belt, a signal representative of the difference between the count in the plus and minus counters is generated. This signal is divided by N so as to generate a belt tare compensation signal which is representative of the average output of the load cell during a single non-loaded revolution of the conveyor belt.

Abstract: Highly accurate and versatile computing scale which is particularly suitable for postal use. The platform of the scale is mounted on and supported by a single load cell in a system requiring no levers, pivots or other moving parts. Weight readings are averaged on a moving average basis, and in one preferred embodiment the scale has an accuracy on the order of 1/32 ounce over a range of 70 pounds. With no load on the scale, any drift is cancelled by increasing or decreasing the net weight reading in small increments during successive counting cycles to maintain an accurate zero reference. The scale includes a keyboard through which a postal clerk can enter information about the destination and type of service desired, and a zip code to postal zone converter is included for automatically determining the postal zone from the zip code. Digital displays indicate the weight and postage to both the clerk and customer.

Abstract: A weighing system is described in which a weighing platform is operatively coupled to a transducer arrangement included in an electrical bridge circuit having connected therein a tare resistor arrangement for balancing out the tare weight of the platform. Means are provided for selectively isolating the effect of the tare resistor arrangement from the bridge circuit so that the system output indicates the sum of the tare weight of the platform and the weight of any load on the platform, thereby enabling the weighing system to be checked using the weight of the platform.

Abstract: A price labeling system employs a highly linear weight-responsive transducer. Two weight measurements are taken with respect to each incoming article, one representing the unladen weight of the scale platform and the other representing the laden weight of the scale platform. Data representing these two measurements are subtracted to provide gross weight of the article and thereby relieving the system of the need to provide a stable "zero" reference when the scale is unladen. The data representing the outputs of the transducer are expanded in range, are subtracted and are divided by the range expansion factor to provide decreased uncertainty in resolution of the analog-to-digital conversion of the transducer outputs. A central processing unit computes the net weight and price of the article on the basis of tare weight and price per pound entries.

Abstract: A system for the automatic zero setting of scales having digital display of the weight is provided so that at tare weight of a bridge mechanism connected to a weighing pan of the scale the display will be as closely equal to zero as possible. Amplifiers and a voltage/frequency transducer are connected to the electrical measuring bridge. A presettable counter connects with the voltage/frequency transducer. The counter is preset so that at tare weight of the bridge mechanism the reading of the scale will be as close to zero as possible. In the path of the information going to the counter a correction unit is arranged. The count provided by the counter is observed by a differentiating unit for detecting deviations of a given magnitude in one direction or the other from a count value which produces a zero indication. The differentiating unit then supplies the correction order and direction of correction to the correction unit.

Abstract: Highly accurate and versatile computing scale which is particularly suitable for postal use. The platform of the scale is mounted on and supported by a single load cell in a system requiring no levers, pivots or other moving parts. Weight readings are averaged on a moving average basis, and in one preferred embodiment the scale has an accuracy on the order of 1/32 ounce over a range of 70 pounds. With no load on the scale, any drift is cancelled by increasing or decreasing the net weight reading in small increments during successive counting cycles to maintain an accurate zero reference. The scale includes a keyboard through which a postal clerk can enter information about the destination and type of service desired, and a zip code to postal zone converter is included for automatically determining the postal zone from the zip code. Digital displays indicate the weight and postage to both the clerk and customer.

Abstract: Tare adjusting apparatus for a computing scale includes a tare adjustment knob for establishing the no-load reference position of the scale and thus compensating for the weight of the packaging material of the product being weighed. A sensing circuit includes a switch for detecting when the tare adjustment knob is adjusted or set to zero and an oscillator circuit for determining when the tare adjustment knob is manually touched. A tare warning lamp is controlled by a control circuit which is responsive to the sensing circuit for lighting the tare warning lamp if the operator should touch the tare adjustment knob during a weighing operation. The tare warning lamp is lit before each weighing operation by the control circuit and is extinguished only when the tare adjustment knob is adjusted or set to zero. Thus the operator is reminded that the proper tare setting may need to be reset after each weighing operation.

Abstract: A patient weighing system for automatically providing a visual display of stantaneous patient weight includes a bed assembly for receiving the patient which is supported by weight responsive means producing analog signals as a function of instantaneous total weight. The analog signals are converted to commensurate digital signals. A first storage register stores the digital signal representative of the weight of the bed assembly without the patient. A second storage register stores the digital signals representative of the total weight of the bed assembly including the patient. A difference digital signal is developed which is representative of the difference between the digital signals stored in the first and second storage registers, providing a net or remainder digital signal which is a function of patient weight.

Abstract: Electrical circuitry and associated mechanical apparatus are combined to provide a non-contactng transducer for adaptation to an existing mechanical scale for adapting the mechanical scale to an electrically controllable scale. The scale movement sensing apparatus is arranged such that there is no frictional or inertial resistance to movement of any of the mechanical scale parts, while providing a continuously variable range over which a scale weight may be sensed.

Abstract: An economical scale is disclosed which utilizes a cantilever beam having positioned thereon a transducer arrangement. The beam is coupled to a platform by means of a rod inserted into an aperture in a linear bearing; thus providing a force only in the axial direction, to enable the weighing of an object positioned at any location on the platform, with extreme accuracy.

Abstract: This invention relates to an improved digital weight measuring and computing apparatus with automatic zero correction which automatically corrects the zero indication of the apparatus.The weight measuring apparatus comprises a scale which employs a load cell and strain gauge to develop an analog voltage representing the weight on the scale. An analog-to-digital converter is then employed to change the analog voltage into a digital representation of the load on the scale. The digital converter provides a digital indication in addition to the digital indications employed to indicate the weight on the scale. The additional digital indication represents fractions of the least weight increment indicated of the weight on the scale. The additional digital indication is then employed to control the generation of a zero correction factor and this factor is then combined with the weight indications from the scale to indicate the correct weight of articles placed on the scale.

Abstract: An electronic scale apparatus for use in determining the net weight of an object placed on a weighing scale features selecting means operable for generating a digital signal corresponding to the dead weight of the object, digital to analog conversion means coupled to the selecting means and operable for producing a first analog signal corresponding to the digital signal, the weighing scale being operable for producing a second analog signal corresponding to the gross weight of the object, a differential amplifier coupled to the conversion means and to the weighing scale and being operable for producing a third analog signal substantially equal to the difference between the first and second analog signals, whereby the third analog signal represents the net weight of the object.

Abstract: Apparatus for weighing a continuous flow of powder material, including two separate weighing hoppers, a diverting valve for switching the flow from one hopper to the other and a closure valve for emptying each hopper. Each hopper is supported for small vertical movements by a suspension system including two pairs of crossed flexible wires at upper and lower levels, with the intersections of the wires lying on a vertical axis through a load cell which thus senses the gross weight of the hopper and its load. An automatic controller with a register totals the successive recorded gross or live weights of the hoppers and subtracts successive readings of the tare weights.

Abstract: In a plural scale system such as a parts counter having a minor scale for measuring the weight of a known number of sample parts and a major scale for measuring the weight of an unknown number of parts to be counted, apparatus for indicating when the scales are zeroed. Circuitry is provided for automatically correcting the weight outputs from each scale for a limited amount of zero errors. A digital display indicates the corrected weight on one of the scales. When the corrected weight on any of the other scales is on zero, an indicator light associated with such scale is illuminated.