The slew rate can be measured using a function generator (usually square wave) and oscilloscope.
A function generator is a device which produces simple repetitive waveforms.
Any small speaker will emit the sound just by connecting to the function generator with two wires.
A function generator supplies pulses between another two terminals.
It is also used in astable multivibrators found in instruments such as function generators.
Wavetek was an electronic test equipment manufacturer that made function generators and signal generators.
Although Wavetek did not invent the function generator, it made them commercially popular.
Some of the most common waveforms produced by the function generator are the sine, square, triangular and sawtooth shapes.
A typical function generator can provide frequencies up to 20 MHz.
Some function generators can also generate white or pink noise.