# REPEATABILITY

1. A measure of the variation in the accuracy of an instrument when identical tests are made under fixed conditions. 2. In a navigation system, the measure of the accuracy with which the system permits the user to return to a specified point as defined only in terms of the coordinates peculiar to that system.

## Related Terms

### GEARBOX

A system of gears which alter the ratio between the revolution of the engine and the propeller shaft so the propeller operates in a relatively efficient speed range. By using a gearbox the engine and the propeller shaft will revolve at different speeds.

### 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.

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.

### POLE-POSITIONING

A design technique used in linear control theory in which many or all of a system's closed-loop poles are positioned as required, by proper choice of a linear state feedback law; if the system is controllable, all of the closed-loop poles can be arbitrarily positioned by this technique.

### PNEUMATIC WEIGHING SYSTEM

A system for weight measurement in which the load is detected by a nozzle and balanced by modulating the air pressure in an opposing capsule.

### PLENUM SYSTEM

A heating or air conditioning system in which air is forced through a plenum chamber for distribution to ducts.

### PLANT DECOMPOSITION

The partitioning of a large-scale control system into subsystems along lines of weak interaction.

### PIECEWISE LINEAR SYSTEM

A system for which one can divide the range of values of input quantities into a finite number of intervals such that the output quantity is a linear function of the input quantity within each of these intervals.

### PHOTOELECTRICLOOPCONTROL

[CONTSYS] Aphotoelectric control system used as a position regulator for a loop of material passing from one stripprocessing line to another that may travel at a different speed. Also known as loop control.

### PHOTOELECTRIC SORTER

A photoelectric control system used to sort objects according to color, size, shape, or other light-changing characteristics.

### Related questions

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