Glossary

The vibration monitoring industry has specialized jargon that is commonly used when talking about vibration sensors, accelerometers and associated applications. It's important that you understand common terminology to communicate effectively with vibration monitoring, reliability, condition monitoring and process automation professionals. We hope you find our glossary useful to find specialized terms and definitions used across vibration, condition monitoring and predictive maintenance.

 






TEMPERATURE COMPENSATED

The range of temperature over which a transducer can operate up to full scale and still meet all specifications. Meggitt’s Endevco pressure transducers incorporate temperature compensation.

TEMPERATURE COMPENSATION

The utilization of supplementary devices, materials, or components with the transducer to minimize sources of error caused by changing temperature.

TEMPERATURE RANGE, OPERATING

The range of ambient temperatures, given by their extremes, within which an instrument is intended to operate.

TERMPERATURE, OPERATING

The range of temperature over which a transducer may be safely operated up to full scale without causing failure; but specifications may not be met.

THERMAL SENSITIVITY SHIFT

(Temperature Sensitivity Error): The change in sensitivity due to changes in ambient temperature from a reference temperature to the specified limits of the Operating Temperature Range.

THERMAL TRANSIENT RESPONSE

The output (response) of an accelerometer when subjected to a temperature change. (See Transient Temperature Error).

THERMAL ZERO SHIFT

The change in zero measurand output due to changes in ambient temperature from a reference temperature to the specified limits of the operating temperature range.

THRESHOLD (RESOLUTION)

Output noise level of a transducer expressed in g. Threshold resolution = Residual Noise / Sensitivity.

TIME CONSTANT

The length of time required for the output of an instrument to rise to 63% of its final value as a result of a step change of the input measurand.

TOTAL PRESSURE

The sum of the pressures (partial pressures) which each gas (in a mixture of gases) would exert were it to occupy the containing vessel alone.

TRACKING FILTER

A band-pass filter (usually narrow-band) whose center frequency can be made to follow an external synchronizing signal.

TRANSDUCER

A device designed to receive energy from one system and to supply energy, of either the same or of a different kind, to another in such a manner that the desired characteristics of the input energy appear at the output.

TRANSFER CHARACTERISTIC

The ratio between output and input of an instrument usually expressed in terms of gain and phase shift as a function of frequency.

TRANSIENT TEMPERATURE ERROR

The output of a transducer when subjected to a specified transient temperature change within the specified operating temperature range. (See Thermal Transient Response.)

TRANSIENT TEMPERATURE SENSITIVITY

Usually expressed as equivalent measurand per degree temperature change measured in accordance with ANSI S2.11-1969, Section 4.9.

TRANSMISSIBILITY

The non-dimensional ratio of the response amplitude of a system in steady-state forced vibration to the excitation amplitude.

TRANSVERSE SENSITIVITY

The maximum sensitivity of a transducer to an acceleration or other measurand perpendicular to the sensitive axis of the transducer (Intended measuring direction). Transverse sensitivity is usually expressed as a percentage of the sensitivity in the sensitive axis.

TRIBOELECTRIC NOISE

Unwanted noise caused by the by electrical charges generated by the rubbing the insulation layers in a cable.

TURN-ON TIME

See Warm-Up Time