Metrology Glossary – E

At J.A. King, we strive to educate our team and our customers so we can all make informed decisions and improve quality. Having information at our fingertips is the best way to do that. We have compiled a list of the most common terminology within the precision measurement industry, backed by our experts with years within our industry.


Precision Measurement Glossary of Terms

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e (Verification Scale Division)

The smallest division (interval) a scale may have and be permitted to set price based on weight

E-min(minimum verification scale division)

Smallest division permissible for a scale to still be able to set price based on weight

Eccentric Load

A load which is non-symmetric with the central axis of a support system. In the case of scales, a base which is not level will create error due to eccentric loading.

Electrical Erasable Programmable Read Only Memory EEPROM)

A read-only memory whose contents can be erased and reprogrammed using a pulsed voltage.

Electrical Noise

Unwanted electrical signals which distort or interfere with the desired signals

Electrical Safety Analyzer

A device dedicated to a various range of electrical safety tests in order to check that the device under test is in compliance with electrical safety requirements

Electromagnetic Interference (EMI)

A disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction.

Electromotive Force (EMF)

Abbreviated emf, is the electrical intensity or developed by a source of electrical energy such as a battery or generator. A device that converts other forms of energy into electrical energy provides an emf as its output.

Electron

A negatively charged subatomic particle which orbits the nucleus of an atom.

Electrostatic

Relating to stationary or slow-moving electric charges rather than currents.

Electrostatic Charge

The excess or deficiency of electrons on a surface which gives the surface a certain positive or negative charge

Electrostatic Discharge

A flow of electricity which causes an object to lose some or all of its charge.

Endothermic

Accompanied by or requiring the absorption of heat (as in a process or or reaction).

Environmentally Protected

There are legislation and or practices in place to protect that area or species

Equilibrium

A steady-state, balanced condition, not presently undergoing a change.

Erasable Programmable Read Only Memory (EPROM)

Read-only memory whose contents can be erased by ultraviolet light or other means and reprogrammed using a pulsed voltage.

Error

The difference between the actual value and the measured value

Eutectic Temperature

The lowest melting point of a temperature system, usually two or more metals; often characterized as a bonding point, as in eutectic bonding gold to aluminum silicon.

Excitation

The application of energy to a particle, object, or physical system. In load cells and other strain gauge systems, an excitation voltage is applied to energize the bridge circuit.

Excitation Trim

The oldest and still most used method of trimming each individual load cell in a scale or similar system with multiple load cells. The output is trimmed by placing series resistance into the supply circuit to reduce the excitation voltage, resulting in the reduction in sensitivity of the individual load cells to equal the lowest one.

Expanded Scale

An arrangement that expands a specific portion of an overall range to occupy a larger portion of the full-scale length than it normally would.

Explosion Proof

An explosion proof enclosure must be able to contain any explosion originating within its housing and prevent sparks from within its housing from igniting vapors, gases, dust, or fibers in the air surrounding it.

Eyepiece Graticule

A glass disc fitted into the eyepiece of a microscope. These can be fitted to existing eyepieces or eyepieces can be purchased with graticules already fitted. The disc is marked with a fine scale from 0 to 100.

 


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