Metrology Glossary – G

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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Gage Block

A system for producing precision lengths, a metal or ceramic block that has been precision ground and lapped to a specific thickness.

Gas Discharge Display

In digital instruments, a numerical readout in which the digit segments are delineated by the glow of ionized gas. Also described as “plasma” or “gas plasma” display.

Gauge Pressure

These measurements above atmospheric pressure treat atmospheric pressure as a zero point, are referred to as “gauge pressure” and are indicated as PSIG. Example of this would be that 100 PSIG equals 114.7 PSIA. Unless otherwise indicated or defined, the reference to PSI is usually taken to be PSIG.

GD&T (Geometric Dimensioning and Tolerancing)

A way to display different tolerence levels. It uses a language of symbols and drawings.

Gradient, Thermal

The rate of change of temperature as a function of distance.

Grounded Junction

A thermocouple construction where the junction is attached (grounded) to the sheath as contrasted to an ungrounded or exposed junction type.

 


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