Education & Training

A vector quantity that describes the rate of change of velocity with respect to time. When unqualified, it refers to an increase in the magnitude of velocity in the direction of motion.

Mathematically, it is expressed as:

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In the case of constant acceleration, it can also be written as:

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A first Test after installation of a new or newly overhauled device, such as a scale. The usual requirement in such a test is that, after correction of installation defects, if any, the errors under test conditions shall not exceed the appropriate acceptance tolerances.

A tolerance for application under test conditions to a new or newly overhauled device; Frequently smaller than the maintenance tolerance acceptable to the same device.

1. The extent to which a measurement reflects the true value of the quantity being measured.

2. The degree of conformity to a recognized standard within the specified tolerances. For instance, a scale or weight that, upon testing, exhibits errors within the allowable tolerance limits is considered accurate and may be used without adjustment.

A screw mechanism designed to facilitate precise positioning of a component, such as a nose iron.

A damping device that operates using air rather than liquid to control motion.

In the context of a scale, to arrange or position components so they are correctly oriented relative to one another or aligned along specified reference lines.

The condition of being properly aligned.

In railway terminology, the horizontal positioning of track elements, including curves and tangents.

An electronic device that produces a proportionally larger power output signal in response to a small input signal.

The total angular displacement of an oscillating component, measured from one extreme position to the other.

An instrument that delivers a continuously variable output capable of assuming an infinite number of values within its operational range, such as a pointer dial or chart recorder.

The total material placed on the load-receiving element of a scale, excluding the weight required to maintain zero-load balance. Also referred to as the live load.

A designated path or surface, including its structural support, used by vehicles or railcars to access or depart from a scale platform.

The section of track directly connected to the weigh rails on a railway scale, facilitating the transition of railcars onto and off the weighing platform.

1. The segment of a lever located between the fulcrum knife-edge and any other pivot knife-edge.

2. The measured length of this segment.

Also known as the lever ratio, it is the ratio of the lengths of the arms on either side of the fulcrum in a lever system.

A mechanical component in a balance or scale designed to stabilize and hold the load-receiving elements or other moving parts in a fixed position. Examples include the finger-like projections beneath the pans of an analytical balance or the weighbeam arrestment in certain scale types. Also referred to as an arresting mechanism.

A type of weighbridge used in modern multi-section railway track scales, where each girder is hinged at the junctions between sections, allowing for independent movement and improved load distribution.

A weighing device integrated into a conveyor system, such as a belt conveyor, that continuously and automatically totals the weight of material transported.

For assistance with Weigh Belt Scales or to see a summary of WTA Conveyor Weigh Scales, please click here

A hopper-based weighing system that automatically discharges and counts individual draughts of material, each corresponding to a predetermined weight.

For assistance with Hopper Scales or to see a summary of WTA Hopper Weighing and Level Systems please click here

A scale that automatically displays the weight of an applied load within its rated capacity, without requiring manual adjustment of the indicating elements. Also referred to as a fully automatic indicating scale.

For assistance with Weigh Indicators or to see a summary of WTA Weigh Indicators and Integrators, please click here

A scale equipped with, or connected to, a mechanism—often actuated by the applied load—that automatically records the weight value on a tape, ticket, or similar medium.

For assistance with Rice Lake Recording Scales, please click here

A function or mechanism that automatically compensates for tare weight, enabling the scale to display net weight directly.

The recording component of an automatic recording scale, responsible for documenting the measured weight.

For assistance with Weigh Indicators or to see a summary of WTA Weigh Indicators and Integrators, please click here

1. In an automatic indicating scale with a movable dial and fixed pointer, an additional indicator that can be independently positioned to offset tare weight or for similar adjustments.

2. In dial-type automatic indicating scales, a manually adjustable secondary pointer used to balance out tare weight or for comparable purposes.

A statistical measure representing the arithmetic mean of a set of values.

1. A real or imaginary straight line through a body or system around which it rotates or is symmetrically arranged.

2. One of a pair (or more) of reference lines used to define the relative positions of points in a coordinate system.

A shaft or spindle on which a wheel rotates, or which rotates with the wheel; also refers to the transverse structural member connecting opposite wheels of a vehicle.

The total load transmitted to a surface—such as a track, scale deck, or platform—by the wheels on a single axle of a vehicle.

A non-commercial, pit-mounted scale specifically designed to measure the individual axle loads of highway vehicles, primarily for traffic monitoring and control purposes.

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