Variable frequency mutual inductor tester

The utility model relates to a frequency conversion mutual inductor tester, which comprises a body, a heat dissipation cavity, a fan and a protection mechanism, and is characterized in that heat dissipation holes can be blocked and protected through a protection door when the tester is idle in daily life, so that external dust and moisture are prevented from permeating into the body, and the tester can be used for testing the frequency conversion mutual inductor. When heat dissipation is needed, the two protective doors are automatically separated through the moving assembly, internal heat can be blown out of the heat dissipation holes through the draught fan, the whole process does not need manual interference, the automation degree is high, the defects caused by the fact that the heat dissipation holes are normally opened can be avoided, the service life of the instrument can be protected, and the instrument is convenient to use. When the protective door needs to move, the motor drives the lead screw to rot