CP series pulse constant voltage source is a card type pulse constant voltage source with narrow pulse width, high precision and wide range introduced by Wuhan PRECISE instrument. The device supports narrow pulse voltage output, and synchronously completes output voltage and current measurement; Support multi-device trigger to realize the device pulse IV scanning, etc. Support output pulse timing sequence (such as delay, pulse width, period and other parameter variables) adjustment, can output complex curve. Supports linear, logarithmic, and custom scanning modes. CP series pulse constant voltage source can be applied to the I-V test of high-speed devices composed of gallium nitride, gallium arsenide and other materials, such as high-power laser, GaN RF power amplifier, memristor, etc.