Marmonix MPQ400 Pro Three-Phase Power Analyzer

The Marmonix MPQ400 Pro power quality analyzer is a handheld three-phase instrument that measures up to 1000 V phase-to-neutral (2000 V phase-to-phase) and up to 1000 A on each phase and the neutral. It analyses voltage and current harmonics to the 50th order with THD and K factor, logs power, energy, power factor and flicker, and captures transients and alarms on its 2 GB memory card. Browse all Marmonix power quality analyzers, or see our clamp meters for quick current checks.

Marmonix MPQ400 Pro Advanced Power Quality Analyzer

The Marmonix MPQ400 Pro is a professional power quality analyzer designed for measuring and analyzing electrical parameters in AC systems. This device allows voltage measurement up to 1000V and current measurement up to 1000A, including the neutral wire, making it essential for a detailed evaluation of power networks. It records the minimum and maximum half-cycle RMS values of voltage and current and measures the peak values of voltage and current to ensure comprehensive power quality analysis.

This analyzer provides detailed power quality assessment through the measurement of Total Harmonic Distortion (THD) and Distortion Factor (DF) for voltage and current (excluding the neutral wire). One of its key features is the capability to monitor power and energy consumption. The device calculates active power, reactive power (capacitive and inductive), and apparent power for each phase (excluding neutral) while also recording active, reactive, and apparent energy. Additionally, it measures the Power Factor (PF) and Displacement Power Factor (DPF) for each phase, along with short-term voltage flicker (PST) evaluation to detect network instability.

The Marmonix MPQ400 Pro is capable of analyzing voltage and current harmonics up to the 50th order, providing information such as harmonic ratio, RMS value, minimum and maximum values. It also calculates the K Factor (KF), which is crucial for assessing harmonic currents in transformers.

One of the standout features of this analyzer is its advanced data logging and monitoring capabilities. It includes a 2GB memory card, allowing users to record up to 100 groups of data and visualize them in histogram or curve formats. Additionally, it can detect and record transient events in power networks, storing up to 150 groups, capturing four complete cycles (one cycle before and three cycles after the event trigger). The alarm recording system supports up to 12,800 groups, displaying the triggered channel, maximum and minimum values after the trigger, and duration of the alarm.

With its advanced capabilities, the Marmonix MPQ400 Pro is an ideal choice for electrical engineers, industrial network technicians, and power quality analysts. This device enables precise monitoring of power networks and helps in identifying and resolving power quality issues effectively.

Marmonix MPQ400 Pro Specifications

Buying guide: Read our power quality analyzer buyer’s guide.

Questions about the MPQ400 Pro power quality analyzer

Which wiring systems can the MPQ400 Pro measure?

The MPQ400 Pro supports single-phase, split-phase, 3-phase 3-wire, 3-phase 4-wire and 3-phase 5-wire connections, using five voltage sockets and four current inputs, so the neutral current is measured as well. Its user manual rates it for CAT IV 600 V or CAT III 1000 V.

Which current sensors work with the MPQ400 Pro?

The MPQ400 Pro manual lists three clamp sensors, 008B for 10 mA–10 A, 040B for 0.10–100 A and 068B for 1.0–1000 A, plus a 300F flexible coil sensor with integrator. All four types are marked optional in the standard configuration, so say which set you need when you ask for a quote.

What can the MPQ400 Pro record?

The MPQ400 Pro records up to 100 groups of trend data on its 2 GB card, up to 150 transient events of four cycles each (one before and three after the trigger) and up to 12,800 alarm records. You view waveforms, harmonic bar graphs and phasor diagrams on its 640×480 backlit screen and upload data to PC software over USB.

Case study: investigating power quality problems on a three-phase supply

Nuisance tripping, overheating neutrals and flickering lights often point to power quality problems that a simple meter cannot show.

A three-phase power quality analyzer connects to all phases and the neutral and records voltage, current, power, energy, power factor and flicker over time. It analyses harmonics up to the 50th order with THD and K factor, and captures transients and alarm events to its memory card.

In a typical investigation, the engineer leaves the analyzer on the affected distribution board through a normal working period, then reviews the recording to link events to load changes. The data shows whether harmonics, imbalance or voltage dips are the cause, and guides the corrective action.