Near-Field EMI Survey Kit for Industry 9kHZ to 6GHz

Insulated Banana Adaptors

Deep Dive: Extra-Large Shielded H-Field Probe for 9kHz to 90MHz

Of special mention for industrial EMI investigation, this kit includes the Type III H-Field Probe. In our experience, we find surveying the H-field in the range of 10kHz to 10MHz is the most relevant to identifying and resolving EMI in industry.

- 4-Layer PCB Structure: This Type III probes features a fully shielded, symmetrical 4-layer design.
- Common-Mode Rejection: The symmetrical structure greatly inhibits electromagnetic interference from the external environment, ensuring that the signal you see on your HSA is purely representative of the local magnetic field under investigation.
- Linearity & Stability: Features a highly linear response from 9 kHz to 90 MHz, making it the primary tool for quantifying EMI current flow.

Frequency Spectrum & Industrial EMI

The different probes in this kit correspond to the stages of EMI development in high-power electronics. Issues which exist at lower frequencies give rise to EMI emissions at higher frequencies.
In our experience, we've found that surveying the H-field in the range of 10kHz to 10MHz is the most relevant to identifying and resolving EMI in industry. EMI Category Frequency Range Industrial Relevance & Measurement Harmonics 50 Hz to 2.5 kHz

Power quality, transformer saturation, heating.

EMI probes are not effective at frequencies this low. To measure in this frequency range, use a current probe such as the Owon CP024 or the Owon CMS clamping scope meter. Supraharmonics 2 kHz to 150 kHz

VSD switching noise, PLC communication interference.

From 9kHz, you can measure the magnetic fields arising from current flow using the Large H-Field probe. Conducted EMI 150 kHz to 30 MHz

Noise traveling through mains cabling and ground loops.

In this range you can survey using a range of different probes and can alternate between H and E field depending on what you're trying to measure. Larger probes are better for area-of-effect and smaller ones have better spatial resolution - allowing you to pinpoint emitters. Radiated EMI 30 MHz to 6 GHz Wireless network disruption, sensor signal corruption.

If you're still reading, then you're clearly interested in the topic or are impacted by it. Don't be a stranger, it's a challenging problem - give us a call and we'll support you as best we can.