AMETEK CTS 3.0 - Manual (Page 130)

Compliance Test System 3.0 User Manual
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12.4 Test Levels
In Annex B of the draft standard, the EUT operating environment classifications are defined based
on IEC 1000-2-4. The classifications are as follows:
Class Environment
Class 1 Applies to protected supplies with compatibility levels lower than public network
levels. It relates to the use of equipment, which is very sensitive to disturbances in
the power supply, for instance the instrumentation of technological laboratories,
some automation and protection equipment, some computers etc. This equipment is
normally supplied by protected supplies such as uninterruptible power supplies, filers
or surge suppressors.
Class 2 Applies to points of common coupling (PCCs for consumer systems) and in-plant
points of common coupling (IPCs) in the industrial environment in general. The
compatibility levels in this class are identical to those of public networks.
Class 3 Applies only to IPCs in industrial environments. It has higher compatibility levels than
those of class 2 for some disturbance phenomena. This class should be considered
when any of the following conditions are met:
- a major part of the load is fed through converters
- welding machines are present
- large motors are frequently started
- loads vary rapidly
Testing is not recommended for Class 1 equipment. Test level X specifications are to be agreed
upon by the manufacturer and user. Test Levels 2, 3 and 4 defined in the standard are applied to
environmental Class 2 and 3 equipment. Test Level 3 is defined for interconnected networks and
Level 4 for non-interconnected networks (islands for example) where the frequency variations can
be much higher. The following table summarizes the EMC classes and test level relationships.
Test Level Environment classification Frequency Variation
Level 1 Class 1 No test required
Level 2 Class 2 ± 3 % of Fnom
Level 3 Class 3 and 4 used in interconnected networks + 4 % and - 6 % of Fnom
Level 4 Class 3 and 4 used in non-interconnected networks ± 15 % of Fnom
Level X Product class specific Open but must be higher
than test level 2.
12.5 Test Options
The voltage regulation of the AC Source can be verified by selecting the "Include Source
Regulation Check" check box. This will cause the AC load to measure its output using the built in
measurement system at all the frequency extremes that will be applied to the EUT during the test.
The measured output voltage must be within the source regulation limits specific in the IEC
61000-4-28 standard. If so, a PASS indication will be shown in green to the right of the option
box. If not, a FAIL indication will be shown in red. If the source regulation check fails, check the
system connections. For higher power loads, make sure the external sense lines are used to
sense the voltage at the EUT terminals.
Tests are started using the Start button or the Run, All menu.
12.6 Test Results
There is no way for the CIGUI to determine the outcome of this test as a clear definition of a
failure can not be given. The draft standard called out the following possible test results:
“The�test�results�shall�be�classified�on�the�basis�of�the�operating�conditions�and�functional�
specifications of the equipment under test, as in the following, unless different specifications are given
by product committees or product specifications.