General
Measurement ranges	0,08 A…3 A | 0,5 A…30 A | 0,5 A…300 A | 0,5 A…3000 A
Enclosure diameter	4,5 cm
Loop length	17 cm
Degree of protection measurement loop	IP67
Battery operating time	300 Stunden

The flexible current transformer MiniFlex® MA110 from Chauvin Arnoux is a measuring instrument for capturing alternating currents over a wide range, specifically designed for applications where access to conductors or busbars is restricted. The device operates on the principle of the Rogowski coil, making it flexible, lightweight, and free from magnetic saturation effects. The measuring loop can be placed directly around conductors without requiring mechanical opening or a fixed magnetic circuit. Current measurement is performed via an output signal in the form of alternating voltage, which can be connected to measuring instruments such as multimeters, wattmeters, or recorders. The loop has an encircling diameter of 4.5 cm and a length of 17 cm, enabling flexible adaptation to various conductor cross-sections.

Applications

The MiniFlex® MA110 is suitable for industrial applications, energy distribution, maintenance and repair services, as well as research and testing laboratories. It is particularly used for harmonic analysis, power measurement, and monitoring current consumption in single-phase and three-phase networks. The low and constant phase shift enables precise power measurements, while the high bandwidth of 10 Hz to 20 kHz also makes it suitable for frequency analysis. The IP67 protection rating of the measuring loop makes the device suitable for outdoor use or in damp environments.

Functions and Equipment in Detail

The device features four measurement ranges: 0.08 A to 3 A, 0.5 A to 30 A, 0.5 A to 300 A, and 0.5 A to 3000 A. The transformation ratios are 1 V/A, 100 mV/A, 10 mV/A, and 1 mV/A, with a typical accuracy of ≤ 1 %. The output signals are transmitted via a two-wire cable with two straight, insulated banana plugs Ø 4 mm. Power supply is either via two AA batteries or externally through a µUSB Type-B connector at 5 V. The battery operating time is 300 hours. The safety category is 600 V CAT IV, enabling safe measurements in electrical installations up to this voltage class.

Technology Explained Simply

The Rogowski coil operates without a magnetic core, preventing saturation effects and ensuring stable measurement even at high currents. The loop detects the change in magnetic flux, which is proportional to the current strength, and converts it into an electrical signal. The integrated electronics in the housing handle signal processing and output as alternating voltage. The low phase shift is crucial for accurate power measurements, as it minimizes the time delay between voltage and current. The IP67 protection rating of the measuring loop protects against dust and temporary water contact, while the housing meets IP54.

Compatibility and Accessories

The MiniFlex® MA110 can be directly connected to measuring instruments with banana plugs. Suitable accessories include a set of two adapters (BNC plug / 4 mm socket), Velcro straps (5 pieces), and a USB power adapter. These components allow flexible adaptation to various measurement systems and facilitate mounting and securing of the device.

Installation and Mounting

The flexible measuring loop is simply placed around the conductor to be measured. The loop is designed to open and close easily, even with safety gloves. The connection cables with banana plugs are connected to the measuring instrument. Power supply is either via the included AA batteries or via an external power supply with a µUSB connector.

Operational Advantages

The combination of flexibility, high bandwidth, and low phase shift makes the MiniFlex® MA110 a reliable tool for precise current measurements. The long battery life of 300 hours allows for extended measurement campaigns without external power. The absence of saturation and heat generation increases the device’s lifespan and reliability. The IP67 protection rating of the loop extends its application range to harsh environments.

Scope of Delivery

The scope of delivery includes the flexible current transformer MiniFlex® MA110, a connection cable with two straight safety banana plugs Ø 4 mm, the user manual, and two AA batteries.