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UL 985 Standard for Household Fire Warning System Units Updated

house fire photo

UL has announced a new edition of UL 985, which applies to “Household Fire Warning System Units.” The sixth edition can be purchased on the UL website.

Description*

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Near and Far Field Measurements with a Vector Network Analyzer

For optimal performance in over-the-air RF systems, antennas must meet specific requirements. Performance parameters like size, wind-loading, environmental ruggedness, transmission pattern, bandwidth, and power handling capability should be considered. Methods of measuring the transmission (or reception) pattern that determines antenna gain with a VNA will be examined in this article.

“These requirements cover household fire warning system control units intended to be installed in accordance with the National Fire Alarm Code, ANSI/NFPA 72, and the National Electrical Code, ANSI/NFPA 70.”

Description from the UL website.

Photo by dvs

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