Inspector V4
Full specifications for the flagship: measurement ranges and accuracies, grounding measurement, package contents and the complete accessory list.
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Technical Resources for Better Monitoring and Troubleshooting.
Engineering guides for the problems we see on real sites, plus the official datasheet for every Inspector model.
Application guides
Start with the problem on your site.
Engineering guides that take one recurring failure at a time — what to measure, where, how to read it, and what to do next. Written by the team behind Inspector.
What a Power Quality Analyzer Actually Tells You — and How to Choose One
A power quality analyzer is only useful if it answers an engineering decision. What the instrument records, where its evidence stops, and how to pick between fixed, portable and panel-mount models.
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Harmonics and Poor Power Factor: Why Your Capacitor Bank Isn’t Fixing It
A hot transformer, an overloaded neutral or a power factor penalty despite a capacitor bank. How to separate reactive loading from harmonic distortion before you buy the wrong fix.
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Why Production Lines Stop “For No Reason”: Tracing Voltage Sags
A line trips several times a week, but everything looks normal when maintenance arrives. How to prove whether the disturbance came from the supply, from inside the plant, or from a generator changeover.
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Building a Defensible Power Quality Baseline (IEC 61000-4-30 and EN 50160)
When a facility and its supplier disagree, screenshots settle nothing. How to plan, record and report a power quality baseline that another engineer can review — and what IEC 61000-4-30 and EN 50160 do and do not say.
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Predictive Maintenance Without the Hype: Motor Current Signatures and Vibration
Current signature analysis and vibration trending can tell you which motor to inspect first. They cannot tell you when it will fail. A practical, honest workflow for screening, escalating and confirming.
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Equipment Fault or Site Power? Settling the Argument in Hospital Imaging
An imaging system aborts a scan, the service engineer finds nothing, and the vendor blames the building. How to build one shared evidence pack that both facilities and the equipment supplier can trust.
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What Did the UPS Really Deliver? Verifying Protected-Load Power
The UPS logged an input event — but did the load see it? And why does output power sometimes exceed input? How to measure both sides of a UPS and read the numbers without fooling yourself.
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VFD Trips and Motor Stress: Check the Supply Before You Replace the Motor
A pump hunts, a fan trips at one speed, a motor runs hot. Before replacing a drive or a motor, separate supply, drive and process causes with measurements on both sides of the VFD.
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Before You Add the Next Big Load: A Practical Site Survey
Nameplate totals say you need an upgrade; occasional meter readings say you have spare capacity. Neither shows coincident demand. How to survey a site properly — including busway hot spots — before the next machine, chiller or shift.
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Solar Inverter Underperformance: Conditions, DC Source, Conversion or Grid?
An inverter produces less than expected and its efficiency swings through the day. How to separate weather, clipping, curtailment and measurement errors from a real fault — and when an I-V curve helps.
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Pharma and Cold-Chain Excursions: Duration, Cause and Response
A cold store left its range overnight and all you have is a maximum value. How to monitor so that every excursion comes with its onset, duration, cause, sensor health and the response taken.
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From Remote Sites to Fleets: Monitoring That Actually Gets a Response
Sensors that nobody answers, alarms duplicated across chat groups, a dashboard that looks current while the link is down. How to design remote and multi-site monitoring that closes the loop to maintenance.
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Portable vs Permanent Power Quality Monitoring: Which One Your Site Needs
A portable analyzer only sees what happens while it is connected; a permanent monitor only helps if someone acts on it. How to choose by how often the problem appears and what evidence you need.
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Power Quality Analyzer Price: What You Actually Pay For
Three-phase analyzers from major brands sell for about US$8,000 to US$16,000. What is inside that price, the engineering time nobody quotes, and how to compare portable and permanent on cost per month of evidence.
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EN 50160 Explained: Voltage Limits, the 95 % Rule and What It Does Not Cover
EN 50160 limits at a glance: supply voltage within ±10 % and THD ≤ 8 % for 95 % of a week of 10-minute values, and how compliance is actually judged.
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IEEE 519 Explained: Harmonic Limits, TDD and What Changed in 2022
IEEE 519 limits in one table: voltage THD 8 % at 1 kV and below, 5 % up to 69 kV, 2.5 % up to 161 kV, current TDD by ISC/IL, and how compliance is checked.
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Voltage Dip vs Sag vs Interruption: Definitions, Causes and Ride-Through
A sag (IEEE) and a dip (IEC) are one event: voltage falls to 10–90 % for half a cycle to 1 minute. Deeper is an interruption. Ride-through explained.
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Transient Overvoltage: Causes, Effects and How to Catch One
Transient overvoltages are microsecond-to-millisecond spikes from lightning, capacitor switching and inductive loads. Types, damage and how to record one.
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Power Quality Problems: Symptoms, Causes and What to Measure
Breakers trip, drives fault, transformers run hot. A symptom-by-symptom table of the power quality causes behind each one, and what to measure to prove it.
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IEC 61000-4-30 Class A vs Class S: Which Do You Need?
Class A makes two instruments agree within a fixed uncertainty; Class S is for surveys. What each class means, the accuracy gap and when Class A matters.
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Datasheets
Official Product Datasheets Published by PowerWadi.
Portable Inspector V4
The same measurement engine in a rugged case, with the 7″ touchscreen and the accessories carried for site surveys.
Request this datasheet →Panel Mount — Standard
AC and DC power quality in the panel, with digital inputs, relay outputs and the optional power-quality and earth-resistance module.
Request this datasheet →Panel Mount — Compact
The same measurement board without a screen, fed 24 V DC — the model to specify when fitting many.
Request this datasheet →Panel Mount — Lite
Environmental monitoring only: temperature, humidity, air quality and vibration for server rooms, stores and warehouses.
Request this datasheet →Engineering guides
Two documents worth the ten minutes.
A field guide to power quality
Dips, swells, harmonics and unbalance — what each one does to equipment, and how it is classified. References IEC 61000-4-30, EN 50160, IEEE 1159 and ITIC/CBEMA.
Request the guide →Hospital power reliability checklist
26 evidence-based checks across supply, UPS, generator transitions, earthing and environment, with a scoring band at the end. Built for biomedical and facilities engineers.
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