EMC compliance information
Mutable Instruments verifies that a properly constructed modular system, based on commercially available cases, power supplies, power distribution boards and a coherent selection of modules meets the requirements defined by international certification bodies.
In the paragraphs that follow, Device refers to the Eurorack module, properly installed, powered, and patched as part of a system.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Changes / modifications not approved by Mutable Instruments SARL could void the user’s authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications.
This device meets the requirements of the following standards:
- EN55032. Electromagnetic compatibility of multimedia equipment. Emission requirements.
- EN55103-2. Electromagnetic compatibility - Product family standard for audio, video, audio-visual and entertainment lighting control apparatus for professional use.
- EN61000-3-2. Limits for harmonic current emissions (equipment input current ≤ 16 A per phase).
- EN61000-3-3. Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection.
- EN62311. Assessment of electronic and electrical equipment related to human exposure restrictions for electromagnetic fields (0 Hz - 300 GHz).
Each Eurorack system is unique. By following the simple rules listed below, you can ensure that your system will perform as well as the configurations that passed our tests:
- DO NOT use open rack frames or other kinds of enclosures exposing the modules and power distribution boards.
- DO NOT leave empty slots in your system. Cover all unused areas with blind panels.
- DO NOT leave large gaps between adjacent modules. Rails with sliding nuts, or blind panels are helpful in achieving this goal.
Power distribution and power supply
- AVOID going for the cheapest options. Only a high-quality power supply and distribution sub-system will ensure that the modules meet their optimal performance and behave according to the standards listed on this page.
- AVOID long power distribution boards with all the connectors in a row and long, thin, power distribution traces. Prefer modern, compact, power distribution boards with star grounding or full ground planes, and thick traces (or dedicated planes) for the supply rails.
- AVOID flying bus boards, except for very small systems (< 48-HP) with only a handful of modules.
- AVOID DIY power supplies. Some of them are excellent (L-1 for example), but Mutable Instruments cannot test any possible build variation of any possible DIY project out there!
- DO NOT use unnecessary long patch cables. Keep all cables shorter than 1m.
Modules from other manufacturers
Modules from other manufacturers may have requirements (such as leaving empty slots in your rack open for ventilation) that go against these rules, or can radiate radio frequency energy well above the levels used in CE immunity tests. In such situations, we suggest you to house the offending modules in a separate case.
ESD discharges may cause temporary disturbances such as clicks or spurious triggering of notes. The disturbance might take time to completely dissipate (for example, with a module like Rings, if the input signal is affected by a transient, the transient can “ring” or reverberate for a few seconds).
Noise and immunity to transmissions
As part of the certification process, Mutable Instruments verifies that modules do not act as unintentional radio receivers. Note that a faint demodulation close to the noise floor (Mutable Instruments’ criterion) can be made noticeably louder with a carefully designed patch (for example, very resonant band-pass filters tuned to the frequency of the parasitic signal).