How the HIOKI PQ3198 Power Quality Analyzer Works

Posted by Billy 05/05/2026 0 Comment(s)
Power Quality Analyzer Principle

POWER QUALITY ANALYZER
PQ3198

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.

Continuous MonitoringTrend logging and event capture run at the same time.
Layered AnalysisIt evaluates RMS, power, harmonics, flicker, and transient behavior.
Fault LocalizationIt helps identify which phase, which moment, and what type of disturbance.
Measurement Pipeline
From live three-phase waveforms to power quality event detection and reporting
IEC 61000-4-30 Ed.3 Class A
as referenced on the official page

1. Power System

The real electrical network produces live voltage, current, distortion, and switching effects.

 
 
 

2. Signal Pickup

Voltage leads and current sensors capture the electrical signal without interrupting the circuit.

Voltage Leads
Current Clamps

3. Analysis

A/D conversion and digital processing turn raw waveforms into RMS, frequency, power, harmonic, and transient information.

Synchronous sampling
Spectrum and event logic

4. Diagnostic Output

Trend values, event timing, waveform snippets, and reports become a traceable diagnosis workflow.

Dip / SwellEvent
HarmonicsSpectrum
Overview

What the PQ3198 is designed to do

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.

It monitors electrical behavior, not just one number

A basic meter tells you what voltage or current is present at one moment. The PQ3198 watches how those values change over time, whether the waveform is distorted, and whether a short event exceeds a threshold.

Voltage DipsFlickerHarmonics
It is useful for intermittent and complex field problems

Many power quality issues appear only when a machine starts, a breaker operates, a charger switches states, or a load changes suddenly. The PQ3198 can stay in place and preserve evidence when the event occurs.

Industrial PlantsBuilding Facilities
It turns measurement into diagnosis

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.

Trend LoggingEvent Triggering
Principle

How the PQ3198 works

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.

The process step by step

1
Acquire voltage and currentThe instrument receives phase voltages through voltage leads and phase currents through clamp or flexible current sensors.
2
Sample all channels synchronouslyChannel synchronization matters because power, phase angle, and imbalance analysis all depend on timing consistency.
3
Compute parameters at different time scalesThe instrument calculates RMS, dips, frequency, power, energy, imbalance, harmonics, interharmonics, and higher-order components.
4
Trigger events and preserve waveform evidenceWhen limits are exceeded or a fast transient is detected, the analyzer stores the waveform segment with associated trend data.
5
Present a usable diagnostic resultThe final output includes timestamps, phase association, waveform snapshots, and report-ready data.
A simple way to think about the PQ3198 is that it acts like a recorder, a spectrum analyzer, and an event marker for the electrical system at the same time.

Why it detects different power quality problems

A
Low-frequency trend problemsSustained low voltage, changing load behavior, and drifting power factor can be found through continuous RMS, power, and frequency logging.
B
Waveform distortion problemsHarmonics and interharmonics are identified by separating the waveform into frequency components.
C
Very short eventsTransient overvoltage lasts too briefly for slow logging to catch reliably, so high-speed waveform capture is required.
D
Standardized power quality evaluationIndicators such as flicker, imbalance, and voltage dips express how stable and usable the supply is under recognized measurement logic.
Interactive Explanation

A visual view of how the signal becomes a diagnosis

This OpenCart-safe version uses static inline visual blocks instead of CSS keyframe animation, reducing the chance that the editor will break the page.

L1
L2
L3
→
Input conditioning
Synchronous sampling
DSP / FFT / Event logic
→
RMS / Frequency / Power
THD / Harmonics / Unbalance
Dip / Swell / Flicker / Transient

Trend monitoring mode

This mode emphasizes continuous observation. The PQ3198 keeps refreshing voltage, current, frequency, power, and energy values, making it suitable for studying load variation and long-duration voltage issues.

Voltage information entering the measurement chain.
Current information needed for phase and power calculation.
Stable trend and energy information.
Related Models On RCCE

RCCE models that relate to the same measurement principle

The links below are ordered primarily by measurement relevance to the PQ3198 principle rather than by price or product age.

Closest Alternative

PQ3100 - HIOKI Power Quality Analyzer

The PQ3100 belongs to the same family and uses similar logic of waveform acquisition, event detection, and trend recording.

View the PQ3100 page
Related, Lighter Duty

PW3360-21 - HIOKI Power Demand Analyzer

Works from measured voltage and current signals and is positioned for power demand, energy logging, and lighter monitoring tasks.

View the PW3360-21 page
Additional note: RCCE also lists the PW3365-20 Clamp On Power Logger. It is related because it also relies on voltage and current signal capture to evaluate power behavior.
Takeaway

The PQ3198 turns intermittent power problems into evidence you can review

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 that it places continuous trends, waveform distortion, and fast abnormal events onto one timeline.

This page was prepared as an RCCE-style technical explanation using publicly accessible information. Reference links: Hioki PQ3198 official page, RCCE PQ3198 blog page, RCCE PQ3100 page, RCCE PW3360-21 page.
Tags: HIOKI PQ3198 Power Quality Analyzer Harmonics Voltage Dips Transient Monitoring Electrical Troubleshooting Three-Phase Measurement