Research bench was developed for electrical machine tests basically in generator mode. It consists of two parts. First part holds drive DC motor, researched machine and DC motor drive module, second part holds measurement panel, voltage and current transformer block and load rheostats. While drive motor runs researchable machine, measurement panel displays amounts of four physical values: voltage, current, frequency and temperature. Main developments 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/multiplexer which is the simplification key in frequency counter circuits. As RMS detector in voltmeters is used IC LTC1966, which gives low cost and high precision performance. Measurement transformer block allows to measure voltage and current in three phases just by switching the phase selector.