The document outlines the basic equipment required for testing op-amp settling times, including a flat-top pulse generator, a DUT test jig, and an oscilloscope. It explains that standard square-wave generators are often unsuitable due to thermal tails and other aberrations that appear in the error signal.
The Tektronix scope preamp type 7A26 used in the test setup can recover quickly enough to accurately measure a DUT's 135-ns settling time.
Reed switches only permit very low repetition rates, from about 100 Hz to about 2 kHz.