1.1.2 Microphone
Short Circuit Protection at Output Stage The amplifier should be protected so that no functional failure
occurs when it is operated with a short across its output stage
for 2 minutes. The amplifier should recover after removing the
short condition.
DC Offset Protection The amplifier with output power of higher than 50W per channel
must ensure that no DC is available at its output in normal mode
as well as abnormal/faulty condition mode.
Thermal Protection There should not be any breakdown or activation of any
protection circuit during the entire thermal profile test. Refers to
the Thermal Profile test stated in Reliability Test Plan for
Multimedia Powered Speaker System.
Output Power Duration FTC requirement:
Warm-up or preconditioning period at 1/8 power for 1 hour,
followed by 5 minutes of continuous Rated Output Power (ROP).
Channels in the same frequency range are tested at ROP.
Subwoofer is tested separately.
IEC requirement :
Output power distortion limited of 60 sec
Short-term maximum output power of 1 sec
Long-term maximum output power of 1 minutes
Temperature-limited output power infinitely
1.2 USB Section
Reference : USB-IF USB 2.0 Electrical Test Specification Version 1.03 dated January, 2005
2-2
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