Keithley single output variable bench dc power supply 2280 series keithley 2280s 60 3 the keithley 2280s 60 3 is a precision measurement dc power supply from the 2280 series this programmable dc power supply can source stable low noise voltages as well as monitor load currents over a wide dynamic range from amps to nanoamps the 2280s 60 3 can output up to 60v at up to 32a the 2280s 60 3 uses a linear regulation to ensure low output noise and superior load current measurement sensitivity