
IEC
IEC 61000-4-31: Testing and measurement techniques - AC mains ports broadband conducted disturbance
Standard Overview
IEC 61000-4-31 relates to the conducted immunity of electrical and electronic equipment to electromagnetic disturbances coming from intended and/or unintended broadband signal sources in the frequency range 150 kHz up to 80 MHz. IEC 61000-4-31 has the status of a basic EMC publication in accordance with IEC Guide 107. IEC 61000-4-31 builds off of the common-mode testing procedures outlined in IEC 61000-4-6 and differential mode testing described in IEC 61000-4-19 (lower frequency range).
The object of this standard is to establish a common reference to evaluate the immunity of electrical and electronic equipment when subjected to conducted disturbances caused by intended and/or unintended broadband signal sources on AC mains ports. The test method documented in this standard describes a consistent method to assess the immunity of an equipment or system against a defined phenomenon.
Equipment not having at least one AC mains port is excluded. The power ports not intended to be connected to AC mains distribution networks are not considered as “AC mains ports” and therefore are excluded.
This standard is applicable only to single-phase equipment having rated input current ≤ 16 A; the application of the broadband disturbance to multiple phase equipment and/or equipment with rated input current > 16 A is under consideration.
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The object of this standard is to establish a common reference to evaluate the immunity of electrical and electronic equipment when subjected to conducted disturbances caused by intended and/or unintended broadband signal sources on AC mains ports. The test method documented in this standard describes a consistent method to assess the immunity of an equipment or system against a defined phenomenon.
Equipment not having at least one AC mains port is excluded. The power ports not intended to be connected to AC mains distribution networks are not considered as “AC mains ports” and therefore are excluded.
This standard is applicable only to single-phase equipment having rated input current ≤ 16 A; the application of the broadband disturbance to multiple phase equipment and/or equipment with rated input current > 16 A is under consideration.
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Products Used in Testing

PMM 9010 | 10 Hz – 30 MHz
- The marker is a very powerful feature, providing an easy-to-read frequency/amplitude value through a simple knob rotation in the window span
- Pre-loaded limits for sweep mode are stored in a nonvolatile memory, providing for CISPR Compliance
- Simultaneous detectors, QP-PK-AVGRMS, for time-coherent measurements, provide parallel indications at every frequency value in the range


Rohde & Schwarz ESW44 | 1 Hz – 44 GHz
- Standard-compliant EMI measurements in spectrum analyzer mode
- RF performance that meets exacting demands
- Exceptionally wide dynamic range


Keysight N9038A-526 | 3 Hz – 26.5 GHz
- DC frequency range 20 Hz to 26.5 GHz
- AC frequency range 10 MHz to 26.5 GHz
- CISPR bandwidth 200 Hz, 9 kHz, 120 kHz, and 1 MHz (MIL-STD and bandwidths incremented in 10% steps)

PMM 9010F | 10 Hz – 30 MHz
- The frequency range of the base PMM-9010F system can be extended to 18Ghz with the addition of the PMM 9030, 9060 and 9180 modules described in more detail below
- Frequency range: 10 Hz – 30 MHz, expandable to 3/6/18 GHz by the external modules 9030, 9060, 9180
- Very low noise floor: < -24 dBµV in band A, < -7 dBµV in band B


PMM CA0010 Click Analyzer | 150 kHz, 500 kHz, 1.4 MHz, 30 MHz
- Performs discontinuous disturbance (click) analysis
- Designed to fulfill CISPR 16-1-1, CISPR 14-1 and IEC/EN55014-1 test standards
- Four independent frequency channels measure simultaneously
