EMC and Audio Equipment -. EN55103-1 and EN55103-2. Mark Briggs, Elliott Labs ([email protected]). Outline of the presentation. The CE Mark The EMC Directive Professional Audio Equipment EN55103-1 - Emissions Standard EN55103-2 Immunity Standard Designing to meet the standards.
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The CE Mark
The EMC Directive
Professional Audio Equipment
EN55103-1 - Emissions Standard
EN55103-2 Immunity Standard
Designing to meet the standards
Termination of a shielded cable
Termination of a four-wire, unshielded cable
During immunity testing the product’s performance has to be assessed against various performance criteria:
Increased non-linearity distortion
Clicks and pops
Change in gain
Change in operating mode (e.g. sample rate changes)
Examples of symptoms of lack of immunity for audio equipment are:
Although the next section concentrates on radiated emissions solutions, there is a reciprocity between emissions and immunity design techniques - the techniques that reduce emissions from a circuit can also reduce the amount of energy that is coupled into a circuit
Be VERY careful when splitting ground planes
tr = rise time in nS
Don’t leave EMC until the end !
RF current probes can be used to measure common mode current on I/O cables in-house (refer to Ott, Chapter 11)
Keep common mode current below 15uA at any frequency for Class A, 5uA for Class B
If local test labs have chambers, get a “quick”scan of boards in the development stage (typically < 2 hours per test)
Chris Marshman, IEEE Press
Henry Ott, John Wiley
Douglas Smith, Van Nostrand Reinhold
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