CISPR 11-2019 pdf free.Industrial, scientific and medical equipment – Radio-frequency disturbance characteristics – Limits and methods of measurement.
Replace the existing title and text of 9.4.3 by the following new title and text:
9.4.3 Peak measurements
Peak measurements in the range above 1 0Hz shall be made for both polarizations of the antenna with the azimuth of the EUT varying every 30° (starting position perpendicular to the front surface plane of the EUT, i.e. in a position perpendicular to the front door, in case of microwave ovens). At each of these 12 positions, a measurement in maximum-hold mode over the full frequency range 1 0Hz to 18 0Hz shall be made for a period of 2 mm.
During the measurement, the water load should be exchanged to cold water before it starts to boil. The measurement at the particular frequency where this happened needs to be restarted.
NOTE 1 lIthe measurements are carried Out in frequency subranges, the measurement time for each subrange is accordingly shOrter. For example, the measuring time for a subrange I GHz 102.4 GHz would be about lOs and the time for a subrange 2,5 GHz to 18 GHz would be about 110 s.
If the emissions from the EUT in this frequency range are very stable, the measurement time at each azimuth/polarization may be reduced, e.g. to 20 s.
The obtained measurement result(s) shall be compared to the peak limit (see Table 13).
If the EUT passes the peak measurement, then the final test result is PASS. see Figure 12.
If the EUT does not pass the peak measurement, final weighted measurements shall be carried out, see Figure 12.
9.4.4 Final measurement
Replace the existing title and text of 9.4.4 by the following new title and text:
9.4.4 Weighted measurements
9.4.4.1 General
In cases where readings obtained during the peak measurement in the range 1 GHz to 18 GHz exceed the limits specified in Table 13, an additional series of measurements with a weighting function shall be performed.
In preparation of the final measurement, the whole frequency range shall be divided into 7 sub-ranges from 1 0Hz to 18 GHz, in accordance with Table 18.
For every sub-range where the EUT did not meet the limits of Table 13, identify the frequency of the highest emission level from the peak measurements. These frequencies are the centre frequencies to be used for the series of weighted measurements, as shown in Table 20.CISPR 11 pdf free download.