Pulse generators are generally voltage sources, with true current pulse generators being available only from a few suppliers.
These pulses can then be injected into a device under test and used as a stimulus or clock signal or analyzed as they progress through the device, confirming the proper operation of the device or pinpointing a fault in the device. Pulse generators are also used to drive devices such as switches, lasers and optical components, modulators, intensifiers as well as resistive loads.The output of a pulse generator may also be used as the modulation signal for a signal generator.