Digital multimeter BM235 TRMS (AC+DC) VFD EF 50kHz Temperature 102138

Safety and precision in demanding industrial conditions

Working with modern control systems, inverters, or industrial installations requires an instrument that not only displays values but, above all, distinguishes useful signals from interference. The BM235 multimeter is designed for electricians and service technicians who deal daily with voltages up to 1000 V and complex waveforms. A key element of its construction is True RMS technology, which guarantees accurate readings of RMS values even with distorted sinusoidal waveforms – a standard in circuits with inverters. This prevents diagnostic errors that, in traditional average-responding meters, could lead to incorrect assessment of the installation's condition.

User safety is a priority here, confirmed by a high level of overvoltage protection compliant with CAT II 1000V, CAT III 600V, and CAT IV 300V standards. Moreover, the manufacturer has ensured protection against human error via the Beep-Jack™ function. This system provides an audible warning when attempting to connect leads to incorrect input jacks, drastically reducing the risk of instrument damage or electric arc occurrence during current measurement. The ergonomic casing allows for comfortable one-handed operation, while the large, backlit LCD display ensures readability even in poorly lit distribution boards.

Intelligent measurement functions for fast diagnostics

In daily work, speed and automation are key. The BM235 offers the AutoV mode, which automatically detects the voltage type (AC or DC) and switches to the appropriate range – no need to manually turn the dial for each measurement. For installers working with VFDs (Variable Frequency Drives), a special low-pass filter (LPF) is available, which eliminates high-frequency interference, allowing precise reading of AC voltage and frequency up to 50 kHz. If the issue is phantom voltage (appearing on disconnected wires), the LoZ (Low Impedance) function effectively eliminates it, showing the true state of the circuit.

The meter is also equipped with advanced detection functions:

• Non-contact voltage detection (EF/NCV) – allows for quick preliminary checks for the presence of voltage without touching live conductors, with Hi/Lo sensitivity selection.
• Contact voltage detection – performed using a test probe for more precise localization.
• BeepLit™ continuity test – combines an audible signal with display backlighting to facilitate work in dark areas and quick identification of shorts or open circuits.
• MAX/MIN/AVG data recording and relative mode Δ – essential for analyzing parameter changes over time or comparing reference values.

Applications and measurement ranges

The device covers a wide spectrum of diagnostic needs, from simple checks of domestic installations to complex measurements in heavy industry. In addition to classic voltage measurements up to 1000 V and current up to 20 A, the multimeter enables resistance testing up to 60 MΩ and capacitance up to 10 mF. The ability to measure temperature in the range of -40°C to 400°C is also useful, eliminating the need to carry an additional thermometer during inspections of heating or cooling systems. Fast result sampling (5 times per second) ensures the device's response is almost instantaneous, facilitating the observation of dynamic changes in the circuit.

Thanks to the combination of solid construction with intelligent measurement algorithms, the BM235 becomes a universal tool for every professional seeking reliability and safety during daily service tasks.