Handheld RMO-TH device is DV Power single-phase instrument specially designed for measuring transformer winding resistance and performing transformer demagnetization.
The instrument has two output DC sources for measuring transformer winding resistance. The first DC source can output a maximum of 2 A DC and is designed for injecting current to the transformer’s high voltage winding. The second DC source can output a maximum of 10 A DC and is designed for testing the transformer’s low voltage winding. Having two separate DC sources is especially useful when measuring the winding resistance of distribution transformers. These transformers have a large turns ratio. Because of that, the difference between resistances of high voltage and low voltage windings is very big. This requires different levels of test currents for high voltage and low voltage windings.
After the winding resistance test, RMO-TH can demagnetize the transformer core. The demagnetization process is completely automatic and safe.
RMO-TH is powered by an internal Li-Ion battery. Up to 100 tests can be performed with a fully charged battery. The battery charging time is 2.5 hours.