The dependence of the signal from an ionization gage on the geometry of the system being measured when an organic vapor is present in the vacuum; the effect can falsify measurement results by up to an order of magnitude.



Related Terms

BASELINE DELAY

The time interval needed for the signal from a master station of a hyperbolic radionavigation system to travel the length of the baseline, introduced as a delay between transmission of the master and slave (or secondary) signals to make it possible to distinguish between the signals and to permit measurement of time differences.

DUHEM-MARGULES EQUATION

An equation showing the relationship between the two constituents of a liquid-vapor system and their partial vapor pressures.

ELECTRONIC POSITION INDICATING RADIO BEACON

(EPIRB) - a buoy type device used for man overboard and in liferafts and lifeboats to send a signal to a satellite system that relays the position of the person(s) in distress to effect their rescue.

GENERAL EMERGENCY ALARM

A sound signal of seven short blasts and one long blast given with the vessel ́s sound system

DEAD TIME

  1. The time interval between a change in the input signal to a process control system and the response to the signal. 2. The time interval, after a response to one signal or event, during which a system is unable to respond to another. Also known as insensitive time.

COMPUTER-CONTROLLED SYSTEM

A feedback control system in which a computer operates on both the input signal and the feedback signal to effect control.

DISTORTION

  1. Any undesired change in the waveform of an electric signal passing through a circuit or other transmission medium. 2. In general, the extent to which a system fails to accurately reproduce the characteristics of an input signal at its output. 3. Any undesired change in the waveform of a sound wave.

FREQUENCY RESPONSE

A measure of the effectiveness with which a circuit, device, or system transmits the different frequencies applied to it; it is a phasor whose magnitude is the ratio of the magnitude of the output signal to that of a sine-wave input, and whose phase is that of the output with respect to the input. Also known as amplitude-frequency response; sine-wave response.

SENSING ELEMENT

The first system element or group of elements. The sensing element performs the initial measurement operation.

REID VAPOR PRESSURE

a measurement of the amount of flammable vapor given off by a liquid of a certain temperature.

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