Read Harman Kardon HK 970 (serv.man14) EMC - CB Certificate online
INTERTEK TESTING SERVICES
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Report No.: 04173782
Performance criteria for immunity
The performance criteria are referred to the test standard:
Performance criteria A
The equipment shall continue to operate as intended during the test. No change of
The equipment shall continue to operate as intended during the test. No change of
actual operating state (for example change of channel) is allowed as a result of the
application of the test. Multifunction equipment shall for each function meet the
relevant requirements. Evaluation is carried out for audio and video functions.
Evaluation of audio quality
The criterion of compliance with the requirement is a wanted to unwanted audio
The criterion of compliance with the requirement is a wanted to unwanted audio
signal ratio of
≥40 dB at a wanted audio signal level of 50 mW, or at another audio
signal level specified by the manufacturer. If the S/N ratio is less than 43 dB, the
performance criterion for audio assessment is the actual S/N ration minus 3 dB. For
AM sound receivers the criterion is
≥26dB at 50mW; and is ≥26dB at 500mW for the
AM/FM car radio or broadcast receiver cards for computers.
Evaluation of video quality
In the evaluation of picture interference the wanted test signal produces a standard
In the evaluation of picture interference the wanted test signal produces a standard
picture (in the case of video tape equipment on the screen of the test-TV-set) and
the unwanted signal produces a degradation of the picture. The degradation may be
in a number of forms, such as a superposed pattern, disturbance of synchronization,
geometrical distortion, loss of picture contrast, of colour, etc.
The criterion of compliance with the requirement is just perceptible degradation by
observation of the picture. The screen shall be observed under normal viewing
conditions (brightness 15 lx to 20 lx), at a viewing distance of six times the height of
screen.
Performance criteria B
The equipment shall continue to operate as intended after the test. No loss of
The equipment shall continue to operate as intended after the test. No loss of
function is allowed after the test when the apparatus is used as intended, but failures
which are recovered automatically but which cause temporary delay in processing,
are permissible. No change of actual operating state for example change of channel
or stored data and settings is allowed as result of the application of the test. During
the test, degradation of performance is allowed.
Ctrl. No.: 1.3.1
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