The HM305D is designed as a portable, multifunctional electrical parameter meter, It is primarily designed for the precise measurement of electrical parameters in various power equipment, enabling rapid acquisition of key data such as voltage, current, power, frequency, and phase. Combining ease of use with data stability, it is suitable for a wide range of operational scenarios, including indoor laboratories, outdoor substations, and on-site locations at industrial and mining enterprises. It meets diverse needs such as power operation and maintenance, third-party testing, and factory quality inspection of equipment. With its compact design and reliable performance, it has become the tool of choice for field testing personnel.

• Measure the transformer load current, load loss, short-circuit voltage, short circuit (load) losses.
• Harmonic test can be analyzed to 31 harmonics.
• Support Three Watt Meter, two table method, two experimental methods.
• Do three-phase transformer no-load, load test, the instrument can automatically determine the wiring is correct, and shows three-phase voltage and current vector map.
• Single machine can do the following 100KVA distribution transformer full load current experiment; in one third of the rated current, complete 250KVA distribution transformer load the following test (in one third of the rated current, the instrument can be converted to load loss under rated current parameters, the machine is mainly used in the test bed with integrated supporting the use of transformers, the load characteristics to achieve high-precision transformer no-load test).
• All the related test results are automatically corrected. Instrument can automatically such as: the waveform correction, temperature correction, non-rated voltage correction, calibration, and other non-rated current correction, so that more accurate test results.

• Current measurement range: 100mA ~ 1A, accuracy class 0.2;
• Voltage Range: 10V ~ 650V, accuracy class 0.2;
• External transformer can broaden the scope of measurement instruments;
• Frequency Range: 40 ~ 65Hz, accuracy class 0.2;
• Power Input: AC220V ± 10%;