B Duncan LTD
EMC Pre-Compliance Testing
Catch EMC problems in development, before they become certification failures or costly redesigns.
Emissions
Emissions analysis
Identifying and reducing unwanted electromagnetic emissions
Conducted Emissions
- Measure unwanted electrical noise conducted along power and signal lines.
- Power both DC and AC equipment from LISN to get standardized source impedance.
- Ensure your product does not interfere with other equipment.
Radiated Emissions
- Identify sources of radiated emissions on PCBs or products.
- Measure magnetic and electric fields.
- Efficiently troubleshoot and mitigate emission issues.
Immunity
Immunity testing
Ensuring your product operates correctly when exposed to common electromagnetic disturbances.
Surge Testing
- Assess the ability to withstand high-energy voltage spikes.
- Simulate events like lightning strikes or power grid switching.
Ring Wave Testing
- Simulate oscillatory transients in power lines due to switching.
- Ensure product resilience to such disturbances.
Electrical Fast Transient (EFT) Testing
- Conducted EFT
- Simulate fast transient disturbances on power lines.
- Assess your product’s immunity to electrical noise.
- Capacitively Coupled EFT
- Introduce transients onto signal lines without direct connection.
- Evaluate the robustness of communication interfaces (USB, CAN, Ethernet, RS232, RS485, etc.).
Electrostatic Discharge (ESD)
- Contact Discharge
- Simulate direct ESD events to conductive surfaces.
- Assess resistance to static electricity.
- Air Gap Discharge
- Evaluate how your product withstands ESD events through the air.
- Test non-conductive surfaces for ESD susceptibility.
Communications
Communications testing
Failures in communication are frequently caused by poor EMC performance on signal lines rather than faults in the hardware itself.
Interface Immunity
- Capacitively coupled EFT on USB, CAN, Ethernet, RS232, RS485 and similar interfaces.
- Evaluate robustness of communication lines to fast transient disturbances.
- Assess susceptibility without direct connection to the circuit under test.
Signal Integrity & Network Diagnostics
- Identify noise sources causing data errors, dropped packets, or intermittent link loss.
- Measure interference conducted along cables and signal lines.
- Industrial network diagnostics including PROFINET and fieldbus systems.
- Assess susceptibility to noise from nearby equipment or shared power supplies.
Power
Power supply testing
Power-related issues are among the most common causes of field failures and pre-compliance problems.
Conducted Emissions
- Power AC and DC equipment from LISN to establish standardised source impedance.
- Measure unwanted electrical noise conducted along power lines.
- Identify whether your product introduces interference onto the supply.
Power Immunity
- Surge testing to simulate lightning strikes and grid-switching events on power inputs.
- Ring wave testing to assess immunity to oscillatory transients from switching.
- EFT testing to evaluate immunity to fast transient bursts on power lines.
Why choose us
Proven experience
Years of EMC testing and fault investigation across a range of industries and equipment types.
Full test capability
Emissions, immunity, communications, power supply and investigatory testing under one roof.
Lab & on-site
We test at our Auckland laboratory or travel to your facility. The same methods apply either way.
Industry standards
All work aligns with IEC 61000 Series, CISPR 32, and FCC Part 15 as applicable.
Clear reporting
Written reports covering procedures, results, and recommendations for every engagement.
Independent & impartial
Our findings stand up to scrutiny for certification bodies, insurers, and legal proceedings.
Related services
Other services you may need
Pre-compliance testing often goes hand in hand with fault investigation. If you’re dealing with an existing problem in the field rather than a development issue, this is where to start.
Most relevant
Electrical System Diagnostics
Where pre-compliance testing identifies problems during development, electrical system diagnostics finds the cause of faults on installed, operating equipment. If you have an intermittent failure, VFD interference, or an earthing issue that others haven’t been able to explain, this is the service for it.
Services
Consulting Services
Independent review of your electronics design or firmware to identify potential EMC issues before they become compliance problems.
Services
Research & Development
Firmware and electronics development for products that need to meet compliance requirements from the ground up.
Ready to start pre-compliance testing?
Tell us about your product and timeline. We’ll confirm what’s needed and turn it around fast.