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AVR270/230
EMC Test Report
Reference No.: NK-12-E-569
4.3.2 Compliance criteria for EN 55020
●Criteria A
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. The equipment is supposed to operate as intended if the criteria of
① and/or ② are fulfilled.
① Evaluation of audio quality
Unless otherwise specified in this standard, 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 ratio minus 3 dB. In this case, at the
beginning of the audio quality evaluation the actual S/N ratio is measured and noted in the test report
as reference value. For AM sound receivers the criterion is ≥26 dB at 50 mW. For AM and FM car
radios and for broadcast receiver cards for computers the criterion is ≥26 dB at 500 mW.
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. The equipment is supposed to operate as intended if the criteria of
① and/or ② are fulfilled.
① Evaluation of audio quality
Unless otherwise specified in this standard, 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 ratio minus 3 dB. In this case, at the
beginning of the audio quality evaluation the actual S/N ratio is measured and noted in the test report
as reference value. For AM sound receivers the criterion is ≥26 dB at 50 mW. For AM and FM car
radios and for broadcast receiver cards for computers the criterion is ≥26 dB at 500 mW.
② Evaluation of picture quality
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 the screen. The picture quality can also be evaluated by
using objective measurement methods; one such method is described in Annex K. In the case of video
tape equipment the test criteria relate to the picture, assessed on a test-tv-set, which is connected to the
video output terminal of the equipment.
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 the screen. The picture quality can also be evaluated by
using objective measurement methods; one such method is described in Annex K. In the case of video
tape equipment the test criteria relate to the picture, assessed on a test-tv-set, which is connected to the
video output terminal of the equipment.
●Criteria B
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 a result of the application of the
test. During the test, degradation of performance is allowed.
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 a result of the application of the
test. During the test, degradation of performance is allowed.
4.4 Measurement Uncertainty
The result of measurements of emissions from ITE shall reference the measurement instrumentation
uncertainty considerations contained in CISPR 16-4-2.
uncertainty considerations contained in CISPR 16-4-2.
●EMCIT document 93/30
●NAMAS Information Sheet NIS81, Ed.1 May 1994
●NAMAS Information Sheet NIS81, Ed.1 May 1994
(The treatment of uncertainties in EMC measurement).
The measurement uncertainty is not considered when deciding PASS or FAIL against the limit lines.
This means that “shared risk” (according to NAMAS publication NIS81 4.2) is used as option
Criterion. The argument for using this method, is that it is commonly accepted that the EMC limits
have already taken common good laboratory practice.
This means that “shared risk” (according to NAMAS publication NIS81 4.2) is used as option
Criterion. The argument for using this method, is that it is commonly accepted that the EMC limits
have already taken common good laboratory practice.
4.5 Final Decision
The equipment under test complies to all requirements of the applied test standards.
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