TIME CONSTANT: The time required for an instrument to register 63.2% of an instantaneous change in the measured parameter.
This is done to increase the time constant of the instrument and thus prevent the motion of the ship from affecting the reading. The instrument is suspended in gimbals to reduce the effects of pitch and roll of the ship.
Rise time is used to specify the transient response of an instrument, and is similar to its time constant, relaxation time, or response time, although these latter terms use (1 − e−1), or about 63%, ...
That part of the difference between the output of an instrument and its input that is due to the failure of the instrument to respond instantaneously to variations of the input signal. It is a function of the instrument's time constant. See time lag.
 See also: Temperature, Meteor, Wind, Weather, Water
  
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