Hi Scott The text is correct but not well written or explained
The paragraph before the text you quoted states The tests consist of subjecting the receiver to a continuous interference signal introduced from a signal generator. This signal shall cover at least the entire assigned band (not affecting other used bands). For that, a frequency-modulated signal shall be used, with a deviation greater than the assigned band and the modulating signal shall be a 15kHz ramp (see details in Annex B). Note the highlighted text. Only one band at a time is blocked. Although not explicitly stated, practically this means you need to use more than one band to transmit signals to pass the test. This is a test for higher grades (3&4) only and would not apply to something for residential use Kind regards Kevin From: S Drysdale [mailto:[email protected]] Sent: Tuesday, October 22, 2019 2:01 PM To: [email protected] Subject: [PSES] Question reguarding EN 50131-5-3:2017 Hi All, I was hoping someone here could help be better understand EN 51031-5-3 for Alarm systems - Intrusion systems. Section 5.5.4 states: 2) The level of interference generated by the interfering transmitting equipment shall be increased until 2 or more alarm messages out of 5 generated by the standard transmitting equipment, are not received by the receiving equipment. This level of the interference signal of the interfering transmitting equipment, measured on the spectrum analyser, is called level IL. 3) Increase that level by 3 dB. 4) 20 messages are sent by the transmitting device used for test purposes. 5) Repeat this procedure (steps 2 to 5) for all used bands. Pass/Fail criterion: The EUT Rx/Tx has passed the test if it has correctly processed all messages sent by the transmitting device used for test purposes and if no failure or tamper message is generated. Do I read correctly that you would raise the interference signal until 40% or greater of messages are not received, then double the power for the interference signal, and the pass/fail requirement after this is that all messages must be received. Hopefully someone can help my misunderstanding because this does not seem to make sense. Best Regards, Scott Drysdale OOO - Own Opinions Only - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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