A device used for carrying out electrical checking on a tested electronic apparatus

The utility model relates to a non-telecentric voltage imaging optical system, and reveals a device used for carrying out electrical checking on a tested electronic apparatus. Irradiation light does not go through an imaging lens before arriving at a modulator. The system does not need to employ a polarization control assembly of a routine voltage imaging optical system to eliminate light noises. The described characteristic of the optical system reduces the quality, the cost and the complexity of the whole checking device by and large. Furthermore, the quality, the cost and the complexity of a non-telecentric lens used for the described system are much lower than a non-telecentric lens in the routine checking system. The system comprises a checking head including an electric light modulator, an offset voltage source generating an offset voltage mode applied to the electric light modulator, a light source used for generating light pulses irradiating the electric light modulator, and the non-telecentric lens a