Circuit for testing current pulse with variable high and low levels

The utility model discloses a circuit for testing current pulse with variable high and low levels, which comprises a sampling circuit, a differential operational amplifier, a comparison operational amplifier circuit and an optical coupling circuit which are electrically connected together in sequence, the input end of the sampling circuit is connected with the tested current pulse, and the output end of the optical coupling circuit is connected with a single chip microcomputer. According to the circuit disclosed by the utility model, a current signal is converted into a voltage signal through the sampling circuit, a low-level 1.4 V pulse signal and a high-level 2.8 V pulse signal are converted into a 0-5V voltage pulse signal through the comparison operation amplification circuit, and the voltage pulse signal is input into the single-chip microcomputer through the optocoupler circuit, so that the accuracy of pulse conversion can be ensured, and the accuracy of pulse conversion can be improved. And the safety