Mettler Toledo LJ16 Spécifications télécharger pdf (Page 192)

Chapter 13: Glossary

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Glossary

Accuracy — A scale’s ability to provide a weight reading equal to the actual weight

placed on the scale. A scale’s accuracy is usually measured against a recognized

standard, such as NIST Certified Test Weights.

Calibration — The process of equating the graduations on a scale to the actual weight

values that they represent. It involves adjusting the scale’s indicator so that it reads zero

when no weight is on the scale and reads the full weight capacity when that weight is

placed on the scale.

Clevis — A U-shaped connector with holes drilled through the arms. A pin is fitted

through the holes to attach the clevis to another component.

Compression — The act of squeezing or pressing down on a material. A compression

weigh module is designed so that its top plate and base plate will be squeezed toward

each other when weight is applied to it.

Creep — The gradual deflection of a material when a steady force is applied to it. Creep

error is the change in a weight reading when a weight is left on a scale for a length of

time.

Deflection — The bending or twisting of a material when force is applied to it.

Distributed Loading — A type of loading in which an object is placed on a scale so that

its full weight is spread over all of the scale’s load cells.

Dynamic Loading — A situation in which the weight applied to a scale is in motion. One

example is a conveyor system used to weigh objects as they move along the conveyor.

Electromagnetic Interference (EMI) — The disturbance of an electrical device’s operation

that is caused when the device picks up electromagnetic radiation from an outside

source.

Full End Loading — A type of loading in which an object is placed on a scale so that its

full weight is temporarily concentrated over the load cells at one end of the scale. Full

end loading is common with conveyor systems, where the object to be weighed moves

across the scale from the front end to the back end.

Hermetic Seal — A metal cover welded or soldered in place to protect the strain gauges

in a load cell. This type of airtight seal is commonly used for harsh environments.

Hysteresis — A scale's ability to repeat measurements of weights as they are added and

removed. When there is a hysteresis error, a scale will give different weight readings for

the same applied load, depending on whether weight is being added to or removed from

the scale. A scale with a hysteresis error might display low readings as weight is being

added and high readings as it is being removed.

Increment — The smallest change in weight that a digital scale can detect (also called a

division).

Indicator — In a digital scale, the indicator is the part of the scale that receives analog

signals transmitted by the load cells and displays them as weight readings.

Linearity — A scale’s ability to maintain a consistent counts-to-load ratio from zero to

full load capacity. When a scale has a linearity error, it reads correctly at zero and at full

load capacity but incorrectly in between those two points.

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