Glossary G

Following is a definition of terms frequently used in the instrumentation, industrial automation and test & measurement communities.

g: The force of acceleration due to gravity equal to 32.1739 ft/sec2 or 386 in./sec2.

Gage Factor: A measure of the ratio of the relative change of resistance to the relative change in length of a piezoresistive strain gage.

Gage Length: The distance between two points where the measurement of strain occurs.

Gauge Pressure Transducer: A transducer which measures pressure in relation to the ambient pressure.

Gauge pressure: Absolute pressure minus local atmospheric pressure.

Gain: The amount of amplification used in an electrical circuit.

Galvanometer: An instrument that measures small electrical currents by means of deflecting magnetic coils.

GPH: Volumetric flow rate in gallons per hour.

GPM: Volumetric flow rate in gallons per minute.

Ground: (1) The electrical neutral line having the same potential as the surrounding earth. (2) The negative side of DC power supply. (3) Reference point for an electrical system.

Grounded Junction: A form of construction of a thermocouple probe where the hot or measuring junction is in electrical contact with the sheath material so that the sheath and thermocouple will have the same electrical potential.