step change

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step change

[′step ‚chānj]
(electronics)
The change of a variable from one value to another in a single process, taking a negligible amount of time.
References in periodicals archive ?
As duct air velocity increased, the differences between positive and negative RH step changes decreased, but even for the highest velocities considered, the positive RH step change tests yielded RH time constants that were, on average, about 50 s greater than their negative counterparts.
Like the RH time constant, the temperature time constant for positive RH step changes at zero velocity was, on average, about 170 s greater than for negative RH step changes.
To characterize the transient response of thin-film capacitive humidity sensors under a range of duct air velocities, an experimental apparatus was designed and fabricated that was capable of exposing test sensors to step changes in RH and temperature.
A test section was designed and built that was capable of exposing duct-mount humidity sensors to a step change in RH and temperature at different duct air velocities.
To expose the test sensor to a step change in RH, the sensor was pushed (or pulled) by hand from one duct to another (Figure 2b).
The test sensor was quickly moved into the adjoining duct, subjecting it to a step change in conditions.
To investigate the differences between exposing the test sensors to a positive (absorption) or negative (desorption) step change in humidity, two RH step change tests were conducted for each temperature step change and duct air velocity condition.
Testing Hierarchy for a Single Test Sensor RH Step Duct Air Change Test Number Velocity Direction Temperature Step Change (+/-) 0[degrees]F 9[degrees]F 18[degrees]F (0[degrees]C) (5[degrees]C) (10[degrees]C) 0 ft/min + 1 11 21 (0 m/s) - 2 12 22 200 + 3 13 23 ft/min (1.
6 m/s), a positive step change in RH of approximately 25%, and a negative temperature step change of 9[degrees]F (5[degrees]C) are presented in Figures 4 and 5, respectively.
The transient responses of both sensors showed characteristics of asymptotic exponential rise or decay, depending on the direction of the step change in RH and temperature.
For a negative step change in RH or temperature, the relationship between RH, temperature, and time is of the following form:
6 m/s)--an average positive RH step change of about 30%, and a negative temperature step change of 9[degrees]F (5[degrees]C) are presented in Figures 6 and 7, respectively.