[en] A two dimensional random pulse generator which creates a pulse amplitude spectrum with random distribution of time and statistically uniform distribution of amplitude is described. Besides, a high resolution stable pulse (reference peak) is also produced just beyond the high end of the spectrum. This generator is designed to replace the radioactive source in testing multichannel analyzer (MCA) or computerized data acquisition and processing system. The shift of channel address and the resolution of pulse amplitude of MCA can be measured precisely and easily by this generator at high input pulse rates