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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


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.


A type of extensometer having a short gage length (10 to 20 millimeters) and employing a compound lever system that gives a magnification of about 1200.


  1. The method of applying a signal to an electronic circuit or device. 2. The process of introducing electrons or holes into a semiconductor so that their total number exceeds the number present at thermal equilibrium. 3. The introduction of fuel, fuel and air, fuel and oxidizer, water, or other substance into an engine induction system or combustion chamber.


A feedback control system in which the control signal is a discontinuous function of the sensed error and may therefore assume one of a limited number of discrete values.


A system employing a device, which penetrates the tank and which, when in use, permits a small quantity of cargo vapor or liquid to be expelled to the atmosphere. When not in use, the device is kept completely closed.


  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.


  1. The ratio of the magnitude of the primary feedback signal in a feedback control system to the magnitude of the actuating signal. 2. Total usable power gain of a carrier terminal or two-wire repeater; maximum usable gain is determined by, and may not exceed, the losses in the closed path.


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


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


A signal obtained by comparing the output of a control system with the input, which is used to diminish the difference between them.

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