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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


A circuit that converts the absolute frequency difference between two input signals to a linearly proportional direct-current output voltage that can be used to drive a meter, recorder, oscilloscope, or other device.


An instrument used in the measurement of the degree Engler, a measure of viscosity; the kinematic viscosity in stokes for this instrument is obtained from the equation 0.00147t 3.74/t, where t is the efflux time in seconds.


A circuit that produces a specified output pulse only when a specified number or combination of two or more input terminals receives pulses within an assigned time interval. Also known as coincidence counter; coincidence gate.


An instrument consisting of two bars mounted perpendicular to each other in the focal plane of a telescope, and inclined to the east-west path of stars by 45 ; used to measure differences in right ascension and declination of celestial objects.


Apparatus to measure pressure differences between two points in a system; it can be a pressured liquid column balanced by a pressured liquid reservoir, a formed metallic pressure element with opposing force, or an electrical-electronic gage (such as strain, thermal-conductivity, or ionization).


An instrument that modifies the flow pattern of a fluid passing through a pipe, duct, or open channel, and thereby produces a difference in pressure between two points, which can then be measured to determine the rate of flow.


A measure of the magnitude of the random errors of a series of observations of some given quantity. If the precision index is large, most of the random errors of the observations are small. The precision index appears as a parameter in the normal (Gaussian) distribution law. While making a series of observations, the standard deviation can be calculated. The precision index is then calculated using a formula and a measure of the precision of the observing instrument is obtained.


Measure time onboard ship. One bell sounds for each half hour. One bell means 12:30, two bells mean 1:00, three bells mean 1:30, and so on until 4:00 (eight bells). At 4:30 the cycle begins again with one bell.


An instrument for determining the velocity of a fluid flow from the time required for discontinuities in the fluid stream to pass between two pairs of transducers that generate and detect highfrequency sound.


An instrument with a remeasure tactile sensibility by determining the distance by which two points pressed against cording device used to measure work performed.

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