AMETEK CTS 3.0 - Manual (Page 22)

Compliance Test System 3.0 User Manual
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Pass/Fail criteria under the new standard are as follows:
The average value for the individual harmonic currents, taken over the entire test observation
period shall be less than or equal to the applicable limits.
For each harmonic order, all 1,5 s smoothed r.m.s. harmonic current values shall be less than or
equal to 150% of the applicable limits.
Harmonic currents less than 0,6% of the input current measured under the test conditions, or less
than 5 mA, whichever is greater, are disregarded.
For the 21st and higher odd order harmonics, the average values obtained for each individual odd
harmonic over the full observation period, calculated from the 1,5 s smoothed values may exceed
the applicable limits by 50% provided that the following conditions are met:
The measured partial odd harmonic current does not exceed the partial odd harmonic
current, which can be calculated from the applicable limits.
All 1,5 s smoothed individual harmonic current values shall be less than or equal to 150%
of the applicable limits.
2.3.2 IEC 61000-3-2 Test Limits
The following table summarizes the current harmonic limits for each device class that are
presently in effect. The limits are generally built into IEC test software programs such as California
Instruments‟ CTS 3.0 Test System software. If the power level of a class D device drops below 75
W (configurable - see System Administrator Manual P/N 5004-985), no harmonic current limits
are applied and the result will always show a pass.
Harmonic no. (n) Class A Class B Class C Class D IEC 555-2
A RMS A RMS % of
fundamental
RMS current
mA/Watt of
input power
(75 - 600 W)
A RMS
TV Receivers
> 165 W
2 1.080 1.620 2 - 0.300
3 2.300 3.450 30 x PF 3.400 0.800
4 0.430 0.645 - - 0.150
5 1.140 1.710 10 1.900 0.600
6 0.300 0.450 - - -
7 0.770 1.155 7 1.000 0.450
8 0.230 0.345 - - -
9 0.400 0.600 5 0.500 0.300
10 0.184 0.276 - - -
11 0.330 0.495 3 0.350 0.170
12 0.153 0.230 - - -
13 0.210 0.315 3 0.296 0.120
Even 14-40 1.84 / n 2.760 / n - - -
Odd 15-39 2.25 / n 3.338 / n 3 3.850 / n 1.500 / n
The actual class limits for all classes have not changed with amendment 14. The power levels for
Class D on which these limits are calculated however and the fundament current and power factor
for class C have been changed however.
First of all, the manufacturer is required to declare the rated power (the fundamental current and
Power Factor for Class-
C) for the product. This “rated power” (current & PF) will be used as the
Table 2-1: IEC 61000-3-2 Class Limits