Eigenschaften
Clamp diameter Ø / sensor length	MA400D-170 : Ø 45 mm / 170 mm MA400D-250 : Ø 70 mm / 250 mm MA400D-1000 : Ø 318 mm / 1000 mm
Dimensions of housing	100 x 60 x 20 mm
Length of connected link cable	0,8 m

The Chauvin Arnoux MA400D-1000 is a digital current measuring instrument of the DigiFlex series, specifically developed for measuring alternating current (AC) in TRMS quality. It features a flexible current transformer with a sensor length of 1000 mm and an encircling Ø of 320 mm, making it particularly suitable for use in enclosures and for measuring currents in multi-core cables. The device is battery-operated and displays the current value directly on a 4000-point digital display. It is approved for use in electrical installations up to 600 V CAT IV according to IEC 61010, which represents a high safety class for measurements in distributors and industrial environments.

Applications
The MA400D-1000 is suitable for measuring AC currents in the range of 0.020 A to 399.9 A. It is particularly useful in electrical installations, for maintenance of distribution systems, and for detecting leakage or fault currents. The high bandwidth of 10 Hz to 3 kHz enables accurate capture of rapidly changing current signals, such as those occurring with electronic loads or frequency converters. Measurement starts at 20 mA, enabling detection of small currents, for example during leakage current measurements.

Functions and Equipment in Detail
The device has three measurement ranges: 0.020 A to 3.999 A, 4.00 A to 39.99 A, and 40.0 A to 399.9 A. Resolution is 1 mA in the lower range, 10 mA in the middle range, and 100 mA in the upper range. Accuracy is ± (2% + 10 digit) in the lower range and ± (1.5% + 2 digit) in the two upper ranges. Display is shown in three display ranges: 4 Aac, 40 Aac, and 400 Aac. The integrated maximum value memory (MAX HOLD) allows recording of the maximum measured current value during measurement.

Technology Explained Simply
The flexible current transformer operates on the principle of a current transformer and induces the measured current in a loop placed around the conductor. TRMS measurement (True Root Mean Square) ensures that even non-sinusoidal alternating currents are measured correctly, which is important for modern electronic loads. Power supply is via two 1.5 V AAA batteries, included in the delivery. The device is designed for operation at temperatures from 0°C to +50°C and weighs approximately 130 g. The housing dimensions are 100 x 60 x 20 mm, making it compact and easy to handle.

Compatibility and Accessories
The MA400D-1000 is compatible with the multifunctional magnetic holder Multifix, which allows the device to be attached to iron or steel surfaces, freeing both hands. Additionally, a transport pouch is included in the delivery, facilitating storage and transport. As accessories, Velcro straps and opening clamps for MiniFLEX are also available, supporting use in various application scenarios.

Mounting and Installation
Installation is performed by clamping the conductor to be measured with the flexible sensor. The clamp is easy to open and closes securely. The device is connected to the sensor via a connecting cable, which is 0.8 m long. Operation is controlled via two buttons, which manage power on, auto-off, display hold (HOLD), and maximum value hold (MAX HOLD).

Advantages in Operation
The MA400D-1000 offers high measurement accuracy, wide bandwidth, and a compact design. The direct display of current value, maximum value memory, and compatibility with the Multifix magnetic holder increase work efficiency. Delivery with batteries, Velcro strap, and pouch ensures immediate operational readiness. The safety approval CAT IV 600 V makes it suitable for use in distributors and industrial installations.