Keysight U3606B Mode D'emploi page 119

Square-Wave Operation
The square-wave function is a unique function for many applications, such as
pulse width modulation (PWM) output, adjustable voltage control, and
synchronous clock (baud rate generator). You can also use this function to check
and calibrate flow-meter displays, counters, tachometers, oscilloscopes,
frequency converter, frequency transmitter, and other frequency input devices.
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Keysight U3606B User's Guide
DC Power Supply Operation
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