4-quadrant bi-polar power supplies and high voltage amplifiers with high speed and compact size. 4-quadrant bi-polar power supplies lineup ultra fast response models and models with integrated function generator, and ideal for evaluation of coils, transformer, capacitors or solar battery related devices or for surface treatment. High voltage amplifiers lineup ultra high speed model with the slew rate of 700V/μs and ultra compact module type. They are the best choice for evaluation of solar battery panel, driving piezo, deflection of electron beam, electro photograph process or various electrostatic tests.