Research bench was developed for electrical machine tests basically in generator mode. It consists of two parts. The first part holds drive DC motor, resercheable machine and DC motor drive module, the second part describes measurement panel, voltage and current transformer block and load rheostats. While drive motor runs researchable machine, measurement panel displays the amounts of four physical values: voltage, current, frequency and temperature. Main develpoments within this bench are: DC motor drive, which is single phase controlled rectifier; frequency counter and frequency counter based RMS voltmeter. The IC MC14553BCP is used as 3 decade counter/driver/multiplexoreter which is the simplification key in frequency counter circuits. As RMS detector in the voltmeter IC LTC1966 is used giving low cost and high precision performance. Measurement transfromer block allows to measure voltage and current in three phases switching the phase selector.