AMETEK MX CTSL - Manual (Page 66)

User Manual MX-CTSL Compliance Test System
California Instruments Revision J 66
5. Harmonics Testing
5.1 About This Chapter
This chapters covers testing a device for compliance with the EN 61000-3-2 Harmonics standard. A review
of the possible EUT classes is provided to assist the user in determining the appropriate device class to
use. Once the device class has been established, the appropriate test module is used to perform the tests.
5.2 Test Standard Selection
Before running any Harmonics test, you must decide if you want to test to the old harmonics standard (EN
61000-3-2:1998, includes Amendments 1 and 2) or the new one. (EN 61000-3-2:2000, Amendment 14).
Both may be used up to January 2004 after which time only the new standard should be used. The
standard selection is made in the lower right hand corner of the setup screen. Once selected, some options
may be grayed out. For example, the new test standard only considers transitory harmonics so the quasi-
stationary selection is disabled. Note that the acquisition window over which the evaluation of current
harmonics is made differs under both standards. Per the EN 61000-4-7 referenced in Amendment 14,
which replaces the Annex B of the 1998 standard, the evaluation window for Amendment 14 is 10 cycles at
50 Hz or 12 cycles at 60 Hz. The 1998 standard is based on an evaluation window of 16 cycles for 50 Hz.
(same 16 cycles is used when the frequency is set to 60 Hz). Selecting the desired test standard
automatically configures the CTS for the correct acquisition window.
5.3 Device Classes
The EN 61000-3-2 categorizes products in one of four product classes. Using the correct class is important
as the harmonic current limits for each class are different. Choosing the wrong class can mean rejecting a
product that otherwise would have passed (False Negative) or passing a product that normally would have
failed (False Positive). Either outcome is undesirable.
The following device classes are defined:
Class A All motor driven equipment, most “domestic” appliances and virtually all 3 phase
equipment (<16 A rms per phase).
Class B All portable electric tools.
Class C All lighting products, including dimmers, with an active input power above 25
Watts.
Class D Products having a power range from 75 to 600 Watts AND a current waveform that
has a special wave shape. For testing to EN 61000-3-2:2000, Amendement 14,
the special waveshape does not apply and only TV's PC's and PC Monitors with
power levels between 75 and 600 W are considered class D. All other products are
class A.