Tekbox TBMHA1 Mains Harmonics Current Coupler

• Mains voltage range: 100–120 V / 200–240 V
• Mains voltage selection switch
• Maximum mains current: 16 A, depending on country-specific mains output socket
• Maximum primary current of current transformer: 25 A
• Transducer factor: 1 mA/A
• Transducer factor with 50 Ω load: 50 mV/A
• Mains input socket: C19, 16 A
• Mains output socket: country-specific
• Available mains output sockets: CEE7/3 16 A (Schuko), NEMA 5-15 15 A, AS/NZS 3112:201 15 A, and BS1363 13 A
• Current output socket: BNC female
• Dimensions (W × H × L): 100 × 118 × 240 mm
• Weight: 1.4 kg

The Tekbox TBMHA1 is a current coupler primarily designed for mains harmonics current measurements on connected loads. The unit is built around a REO WKO/CL-P25 AC/DC compensated wideband current transformer, with the mains line passing through the transformer core aperture.

The TBMHA1 produces a current proportional to the mains current of the connected load. A shunt resistor is therefore required for measurement, which can be the input impedance of a DC-coupled measurement receiver or a 50 Ω BNC feed-through termination connected to the current output. The current transformer has a maximum primary current of 25 A and a transducer factor of 1 mA/A. With a 50 Ω termination, the transducer factor is 50 mV/A.

The TBMHA1 features a 16 A C19 connector on the mains input side and a country-specific mains socket for connecting the load. The unit supports mains voltage ranges of 100–120 V and 200–240 V, selectable via a mains voltage selection switch.