The PQ3198 is essentially a power quality analyzer that keeps listening to a three-phase electrical system in real time. It continuously records voltage, current, power, frequency, and harmonic behavior while watching for dips, swells, flicker, transients, inrush current, and other abnormalities. When something unusual happens, it saves both the event and the surrounding evidence.
Based on the Hioki official product page, the PQ3198 is intended to monitor and record power supply anomalies and help users investigate issues such as voltage dips, flicker, harmonics, transient overvoltage, inrush current, and other power quality problems.
A basic meter tells you what voltage or current is present at one moment. The PQ3198 goes further. It watches how those values change over time, whether the waveform is distorted, whether a short event exceeds a threshold, and what the waveform looked like before and after the disturbance.
Many power quality issues do not happen continuously. They appear only when a machine starts, a breaker operates, a charger switches states, or a load changes suddenly. The PQ3198 is valuable because it stays in place and preserves evidence when the abnormal event finally occurs.
Starting from raw voltage and current waveforms, the instrument calculates power, power factor, frequency, harmonics, imbalance, and event conditions. Instead of isolated data points, you get a connected diagnostic story.
The explanation below is based on the measurement functions described on the Hioki official page together with the common operating principle of industrial power quality analyzers.
This animation is intentionally simplified. It does not try to replicate the internal hardware layout. Instead, it illustrates the three essential stages: waveform input, analysis core, and diagnostic output.
This mode emphasizes continuous observation. The PQ3198 keeps refreshing voltage, current, frequency, power, and energy values, making it suitable for studying load variation, long-duration voltage issues, and recurring operating patterns.
This mode focuses on whether the waveform is no longer a clean sine wave. The analysis core separates the signal into frequency components and evaluates harmonic content and distortion severity, which is useful when variable speed drives, rectifiers, or switching power electronics are involved.
Transient events are brief spikes or abrupt changes in voltage. Standard slow logging often misses them. This mode highlights the role of high-speed sampling and event buffering so the analyzer can preserve the context around the event.
The links below were compiled from publicly accessible RCCE pages confirmed on May 5, 2026. They are ordered primarily by measurement relevance to the PQ3198 principle rather than by price or product age.
This is the most direct match to the subject of this page. It is the RCCE-listed PQ3198 entry for three-phase power quality event recording, harmonic analysis, and field troubleshooting.
The PQ3100 belongs to the same family of power quality analyzers. It uses the same general logic of synchronous waveform acquisition, event detection, and trend recording, while being positioned more toward accessible, everyday troubleshooting.
This instrument also works from measured voltage and current signals and includes harmonic-related functions, but it is positioned more for power demand, energy logging, and lighter monitoring tasks than for full Class A power quality investigation.
If you only look at voltage and current at one instant, many power quality problems seem to disappear. The real strength of the PQ3198 is not just that it measures accurately, but that it places continuous trends, waveform distortion, and fast abnormal events onto one timeline. That makes it easier to move from suspicion to diagnosis, whether the issue is caused by motor startup, variable frequency drives, switching behavior, or transient disturbances.
