User manual

Compliance Test System 3.0 User Manual
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
basis for the limit calculation of Class-D (Class-C). Thus, a “rated power” of 150 Watt for
example, will yield a third harmonic limit of 150 x 3.4 = 510 mA. Similarly, a rated fundamental
current of 0.4 Amp, and a rated PF of 0.98 for an electronic ballast will result in a third harmonic
limit of 0.4 x 0.3 x 0.98 = 117.6 mA. Thus, the amendment requires that an automated
compliance test system must allow the user to enter this rated power or rated current. Also, the
test system must verify the power (fundamental current and PF) because these “rated vales” as
declared by the manufacturer must be within +/- 10 % of the actual values. If not, the actually
measured values are to be used for the limit calculation. The method to measure these actual
power, fundamental current and PF differ from the “average method” used in existing test
systems, and of course differ also from the “dynamic limit method”.
The Pass/Fail criterion is given above. The “10 % of the time over 100 % of the limits” no longer
exists. The average harmonic level during the whole test must simply be below the limit, and
individual values in each acquisition window (after 1.5 sec filtering) must be below 150 % of the
limit. There is also an extra allowance for the higher harmonics from H
21 - H 39 .
The CTS fully supports and implements Amendment 14.
2.3.3 IEC 61000-3-2:2000 Test Time
Under the new test standard, four test times (observation periods) are allowed depending on the
nature of the EUT. All are aimed at ensuring repeatability of test results when tests are
performed under the same conditions and on the same test system. Repeatability for this
purpose is defined as results that are within 5 %. Available observation periods shown in the
table below.
Table 2-2: Harmonics Amendment 14 Test Times
Type of equipment
behavior
Observation period
Quasi-stationary T
obs
of sufficient duration to meet the requirements for repeatability.
Short cycles (Tcycle < 2.5
min)
T
obs
> 10 cycles (reference method) or Tobs of sufficient duration
or synchronization to meet the requirements for repeatability.
'Synchronization' means that the total observation period is
sufficiently close to including an exact integral number of
equipment cycles such that the requirements for repeatability are
met.
Random T
obs
of sufficient duration to meet the requirements for repeatability.
Long cyclic (Tcycle > 2.5
min)
Full equipment program cycle (reference method) or a
representative 2.5-min period considered by the manufacturer as
the operating period with the highest total harmonic content.
20 Revision N California Instruments