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An instrument that contains a frequency standard and can be used to measure the number of events or the number of cycles of a periodic quantity that occurs in a specified time, or the time between two events.

Related Terms

AMMETER

An instrument for measuring the magnitude of electric current flow.

HYDROMETER

An instrument for determining either the specific gravity of a liquid or the API gravity.

ACCELERATION

The time rate of change of velocity; i.e., the derivative of velocity; with respect to time.

RUNNING TIME

Amount of time an unit, equipment or system is run per hour or per 24 hours.

GROUP REPETITION INTERVAL

The specified time interval of a Loran C chain for all stations of the chain to transmit their pulse groups. For each chain a minimum group repetition interval (GRI) is selected of sufficient duration to provide time for each station to transmit its pulse group and additional time between each pulse group so that signals from two or more stations cannot overlap in time anywhere within the coverage area. The GRI is normally stated in terms of tens of microseconds; i.e., the GRI having a duration of 79,900 microseconds is stated as 7900.

HARMONIC FUNCTION

Any real function that satisfies a certain equation. In its simplest form, as used in tide and tidal current predictions, it is a quantity that varies as the cosine of an angle that increases uniformly with time

HOUR-GLASS EFFECT

A radarscope phenomenon which appears as a constriction or expansion of the display near the center of the plan position indicator, which can be caused by a nonlinear time base or the sweep plot starting on the radar indicator at the same instant as the transmission of the pulse. The phenomenon is most apparent when in narrow rivers or close to shore.

HUNTING

Fluctuation about a mid-point due to instability, as oscillations of the needle of an instrument about the zero point.

FLOW RATE

The volume, mass, or weight of a fluid passing through any conductor per unit of time.

ANEMOMETER

An instrument for measuring the velocity of a fluid.
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