ELECTRICAL SYSTEM DIAGNOSTICS
On-site fault investigation for industrial and marine electrical systems
Our team investigates electrical, EMC, and control system faults on installed, operating equipment. We travel to your factory, vessel, or facility anywhere in New Zealand and work under real operating conditions to find the cause.
COMMON PROBLEMS WE DIAGNOSE
Clients come with a symptom, not a specification
If any of these sound familiar, this is the kind of work we do.
Intermittent network dropouts
Communication failures on industrial networks with no consistent trigger and no agreement on the cause.
VFD interference
Variable frequency drive noise causing interference on power rails, signal lines, or communication networks.
Earthing & shielding issues
Incorrect earthing or shielding causing interference between systems, often introduced during installation.
Unresolved previous investigation
A fault that one or more firms have already investigated without finding the cause.
Unexplained equipment restarts
Equipment that resets or misbehaves only under certain operating conditions with no obvious trigger.
Unexplained noise or ripple
Noise on a power or signal rail that others have already checked and found nothing.
HOW WE WORK
Measured, not guessed
We characterise the fault before drawing any conclusions. Our team instruments the system, captures behaviour under real operating conditions, and rules causes in and out by measurement. The result is a root cause we can demonstrate, not a list of parts that were replaced in the hope one of them helped.
Instrument first
We characterise the fault under real conditions before drawing any conclusions.
Measurement-led
Every cause is ruled in or out by measurement. No assumptions, no guesswork.
Defensible findings
Written reports document procedures, measurements, and conclusions in a form that holds up to scrutiny.
CAPABILITIES & EQUIPMENT
Our own instrumentation, brought to your site
We bring all test equipment to every engagement. No reliance on site instrumentation, no delays.
Spectrum analyser
Conducted and radiated emissions at system level across the full frequency range.
RF current transformers
Cable noise measurement and shielding effectiveness without breaking the circuit.
Differential & current probes
Common-mode and differential-mode noise decomposition on power and signal lines.
LISN
Conducted emissions on AC and DC power lines to standardised source impedance.
Network diagnostics
PROFINET, fieldbus, and Ethernet control network analysis on live industrial systems.
Earthing & isolation analysis
Earthing faults, isolation failures, and ground loops on IT and floating systems.
INDUSTRIES WE WORK WITH
Experience across sectors where electrical reliability and EMC performance matter
Our team works across a range of industries where the consequences of electromagnetic interference, communication failure, or power supply issues are significant, and the demands of operating installed systems in real environments present challenges beyond standard bench testing.
Marine
Vessels & offshore
Industrial
Factories & plants
Electronics
Product development
Energy
Generation & grid
Commercial
Buildings & fit-out
INVESTIGATORY TESTING & FAULT DIAGNOSIS
Root-cause investigation for faults that others haven't been able to explain.
Some faults don’t show up on a bench. Intermittent failures, system-level interference, and problems that have already been looked at without resolution require a different approach. Our team works on installed, operating systems under real conditions, ruling causes in and out by measurement rather than assumption.
Fault investigation
We instrument systems under real operating conditions and characterise fault behaviour by measurement. Typical work includes:
- Conducted emissions and coupling-path analysis
- Common-mode and differential-mode noise decomposition
- Earthing and isolation analysis
- Industrial network diagnostics including PROFINET and fieldbus
Independent investigation & expert witness
Where a failure has become a dispute, insurance claim, or legal proceeding, we provide independent root-cause investigation with written findings suitable for use in claims and proceedings. We establish what happened, why it happened, and whether it was avoidable.
WHY CHOOSE US
Expert fault investigation, delivered on-site
On-site anywhere in New Zealand.
We travel to your facility with our full test capability. The same instruments and methods apply on a vessel, in a factory, or in our Auckland laboratory.
Measurement-led investigation.
Every finding is evidence-based. We rule causes in and out by measurement, not by replacing parts and hoping.
Clear, defensible reporting.
Written reports covering procedures, measurements, and conclusions suitable for internal review, manufacturers, insurers, and legal proceedings.