Metrology Glossary – V

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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V-Min (Minimum Verification Scale Division/Load Cell)

The smallest interval into which a load cell’s measuring range can be divided.


A space from which all matter has been removed. In practice, the term also refers to a space where the attempt has been made to create a vacuum, but there is a very small amount of residual matter remaining.

Vacuum Gauge

Used to measure the degree of density reduction below ambient pressure.


Collection and evaluation of data, from the. process design stage throughout. production, which establishes scientific evidence that a process is capable of consistently delivering quality products.

VAR (Volt-Amperes Reactive)

The unit for reactive power as opposed to real power (watts).


The speed an object is traveling in a specific direction.

Vernier Scale

A type of visual reference scale frequently utilized on dimensional measurement equipment such as a Caliper or Micrometer. See article: how to read a Vernier scale.

Vickers Hardness Test

An indentation hardness test for metals in which a 136-degree diamond pyramid is pressed into the surface of the metal being tested by a load of 5 to 120 kilograms

Video Measurement Machine

A highly repeatable 3-axis measurement machine which takes measurements using optics, allowing for measurement without touching the part.

Viscocity Meter

A measuring instrument used to determine a fluid’s internal flow resistance or viscosity


A measure of a liquid’s resistance to flow or the “thickness” of the liquid. For example, honey is thicker and more resistant to flow than water so it has a higher viscosity.

Volitile Memory

Computer memory that requires power to maintain the stored information; it retains its contents while powered on but when the power is interrupted, the stored data is quickly lost


The SI unit of electromotive force, the difference of potential that would drive one ampere of current against one ohm resistance

Volt Ampere(s)

The product of the RMS voltage applied to a circuit and the RMS current, in amperes, flowing through it.


Quantitative expression of the electrical potential difference that exists between two points in an electrical field with the ability of producing a flow when the circuit is closed.

Voltage Dip

A reduction of voltage level lasting at least one alternating current cycle. Can be caused by a short circuit, overload, or starting of electric motors.

Voltage Spike

Fast, short electrical transients in the electric potential of a circuit that can be caused by lightning strikes, power outages, tripped circuit breakers, short circuits, etc.

Voltage Surge

An increase of voltage level lasting at least one alternating current cycle that can damage, degrade, or destroy electronic equipment.

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