Digital multimeter BM231 TRMS (AC+DC) VFD EF 102173

Safety and Precision in Electrical Measurements

In industrial environments and during maintenance work, it is crucial to have a tool that not only accurately reads values but, above all, protects the user from operational errors. The BM231 multimeter is a device designed for electricians working in challenging conditions, offering the Beep-Jack™ function. This solution automatically detects incorrect probe connections to the input jacks and emits an audible signal before any damage to the instrument or danger to the operator occurs. As a result, the risk of mistakes when switching ranges or measuring voltage instead of resistance is drastically reduced.

The device also features advanced True RMS technology, enabling reliable results even in circuits with distorted voltage and current waveforms. This is an invaluable feature when diagnosing modern installations powered by inverters or other electronic devices. The meter supports VFD-ACV and VFD-Hz functions with a low-pass filter (LPF), eliminating high-frequency interference typical of motor control systems, ensuring stable readings where standard meters would fail or display incorrect values.

Ergonomics and Versatile Diagnostic Functions

The construction of this model has been thoughtfully designed for comfortable one-handed operation, which is essential when working on ladders or in hard-to-reach locations. The large, clear LCD display with backlighting facilitates reading results in poorly illuminated distribution boards. Fast sampling of results (5 times per second) allows for real-time reaction to parameter changes in the circuit. In addition to basic voltage measurements (up to 1000 V AC/DC) and current measurements (up to 20 A AC/DC), the device offers a range of additional tools:

• Non-contact voltage detection (NCV/EF) with adjustable sensitivity (Hi/Lo) – allows quick verification of voltage presence without touching live parts.
• Contact voltage detection using a dedicated probe – an additional safety level when locating live circuits.
• BeepLit™ continuity test – combines an audible signal with display backlighting, facilitating work in darkness.
• Data recording modes: MAX/MIN/AVG and relative measurements Δ – essential for analyzing parameter changes over time and comparing reference values.
• HOLD function to freeze the result on the screen for easier data recording.

Compliance with Standards and Overload Resistance

Safety in electrical installations requires meeting rigorous surge resistance standards. This multimeter is certified for the following safety categories:

• CAT II 1000 V
• CAT III 600 V
• CAT IV 300 V

This means the device is suitable for safely performing measurements in both residential installations and main industrial distribution boards, as well as at power sources. The high level of surge protection makes the instrument resistant to sudden voltage spikes that may occur during short circuits or the startup of large loads.

It is worth highlighting the measurement ranges of the device: the meter handles AC and DC voltage up to 1000 V, current up to 20 A, and resistance up to 60 MΩ. All these measurements are performed using True RMS technology, ensuring precision even with complex waveforms characteristic of modern industrial automation. Thanks to the combination of protective functions, advanced measurement algorithms, and ergonomic design, this model constitutes a solid tool for professionals requiring reliability in daily service and installation work.