AMETEK MX CTSL - Manual (Page 18)

User Manual MX-CTSL Compliance Test System
California Instruments Revision J 18
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 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 EN 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 are shown in the table below.
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.
Table 2-2: Harmonics Amendment 14 Test Times