The slew rate can be measured using a function generator (usually square wave) and oscilloscope.
Related measurements are slew rate and rise time.
Many otherwise good power amplifier designs have been found to have inadequate slew rates, by modern standards.
This example used a fixed mounted flywheel sized to result in a 1/2 Hz per second slew rate.
Measured as the slew rate, it is usually specified in volts per microsecond.
The 2.4-meter is capable of slew rates of 10 degrees per second, enabling it to observe artificial objects in low Earth orbit.
However, when the slew rate of the current is not so severe (e.g. Line frequency) the effect can be safely ignored.
The slew rate of a gradient system is a measure of how quickly the gradients can be ramped on or off.
The slew rate, or how fast the signal changes between levels, is also controlled.
Along with slew rate, this is one of the reasons why operational amplifiers have limited bandwidth.