EMC analysis of discontinuous disturbances (click rate)

Your task

Most modern electronically controlled appliances still switch their loads – such as heating elements and motors – with mechanical relays. Each relay opening or closing generates a short, broadband click that can exceed the disturbance voltage limits of a quasi-peak (QP) detector. Because these transients are intermittent, they are evaluated separately as discontinuous disturbances (clicks) in line with CISPR 14-1/EN 55014-1.

Rohde & Schwarz solution

The R&S®EPL1-K59/R&S®ESW-K59 click rate analyzer option with an R&S®EPL or R&S®ESW EMI test receiver provides a complete solution for all applicable requirements.

The key features of this solution are:

• Compliance with CISPR 14-1:2016/EN 55014-1:2017 and CISPR 14-1:2020/EN 55014-1:2021 (alternative frequency settings for DENAN law supported)
• Four-channel standard compliant click rate analysis (150 kHz, 500 kHz, 1.4 MHz and 30 MHz in parallel)
• Accredited verification in line with CISPR 16-1-1 available
• Time resolution ≤ 500 μs for precise measurement of the click duration using the peak detector and determination of compliance using the quasi-peak detector
• Recording the number of clicks and calculation of click rate
• Allowance of all exceptions specified by standards
• Remote control of R&S®ENV216, R&S®ENV432, R&S®ENV4200, R&S®ESH2-Z5 and R&S®ESH3-Z5 ¹⁾ line impedance stabilization networks (LISN)
• Generation of detailed test report
• Electronic archiving of measured data over a measuring time of up to four hours
• Possibility of post-modification of measurement settings

¹⁾ R&S®ESH2-Z5 and R&S®ESH3-Z5 are discontinued.

Application

The R&S®EPL1-K59/R&S®ESW-K59 four-channel click rate analyzer option provides everything required to measure CISPR 14-1 compliant discontinuous disturbance measurements (click measurements). These measurements can be easily configured and run for a defined period of time or until a specific number of clicks is detected.

R&S®EPL EMI test receiver with click rate analyzer

• Straightforward configuration of all presettings
• Fully automated test run for EUT programs lasting up to four hours

Detailed display of measured clicks

• Complete timeline, zoom area and actual traces of all four channels or only those of interest are displayed in one window
• Relevant values can be measured and presented
• Postprocessing possible over the entire measured data

Overall result view

• Final result view with calculated click rate per channel and test verdict
• Disclosure of used exemptions
• Recalculation with modified presetting possible

Flow chart decision view

Visualization of decisions regarding the applied standard in a flow chart.

Summary

For both conformance test houses and appliance development, the R&S®EPL and R&S®ESW EMI test receivers with click rate analyzer option provide a reliable solution that covers all applicable requirements in the context of discontinuous disturbance measurements (click rate analysis).