Determine if signal is changing?

Quick question:
I am acquiring a simple voltage signal from a pressure sensor. And I am building a simple LabVIEW GUI for calibrating the measurement.
For the calibration, I am applying a knopwn pressure to the sensor. And then I want to use LabVIEW to detect if the signal has stopped changing ... e.g., detect if it has settled to a steady-state voltage.
Any tips on a quick way to calculate this?
I considered trying to fit a line to the last 5-10 seconds of data and then calculate the slope of the line ... if the slope is not very close to zero, then the signal has not flattened out.

Use some of the statisics functions.
There is a distribution calculation function for an array.
If you detect that the distribution is small enough to be considered 'steady-state' you can take the mean.
Ton
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Determine if signal is changing?

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