How To (Cheaply) Measure Conductive EMI on 110V or 120V AC
- Nov 6, 2025
- 2 min read
Spectrum Analyzer
This spectrum analyzer is inexpensive, and covers the range from 9KHz to 1.5GHz. There are other models with different ranges.
WHERE TO BUY
LISN
TBLC08 50µH AC-LISN User Manual
WHERE TO BUY
From the seller's website:
This particular LISN is designed for testing according to the CISPR16 standard, but it can be used as a pre-compliance tool for many other standards such as FCC Part 15B conducted emissions testing.
It’s designed to measure conducted emissions in the 9 kHz to 30 MHz band with an impedance of 50 Ω ║ (50 µH + 5 Ω).
The LISN is inserted into the supply line of the DUT (Device Under Test). The device measures a combination of the differential mode and common mode noise that’s present at the supply terminals of the DUT. Connect any spectrum analyzer to the BNC connector with a cable to measure the noise.
The device is designed for testing single phase, AC-powered equipment with supply voltages up to maximum 240V. Conducted noise can be measured on the phase and on the neutral conductor. The TBLC08 is equipped with a switchable limiter/attenuator and an artificial hand connection.
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