AMETEK CTS 3.0 - Manual (Page 129)

User Manual Compliance Test System 3.0
125
12.3 Test Sequence
The test sequence implemented by this test consists of a series of frequency variations consistent
with commonly found phenomena on the public utility power grid. The objective of this test is to
evaluate a product for immunity from such variations.
Frequency variations are applied at different levels for different product categories. The user must
determine the product class and select the appropriate test level. During the test run, frequency
changes are applied at the zero degree phase angle of the waveform. Both up and down shifts of
the frequency are performed. Test levels and test times are displayed in the test parameter data
entry grid. The various columns in the test data setup are shown in the figure below. In this
example, the following parameters were specified in the data entry grid:
Freq. Change Transition Hold Level Repeat Delay Repeat
-15 1 120 2 60 3
Fnom =50 Hz
Test
Level =
-15 %
Level
Repeat = 2 Delay =
60 secs
Repeat = 3
Ttrans =
1 sec Hold Time=
120 secs
Delay =
60 secs
These parameters can be entered on screen by the operator or loaded from disk. To load a new
test or test class, select the File, Open menu. The default location for IEC test files is:
C:\Program Files\California Instruments\Cigui32\IEC_Test
or
C:\Program Files\California Instruments\CiguiSII\IEC_Test.
The following four IEC 61000-4-28 test files are distributed with the CIGUI32 or CIGuiSII program:
File Name Test Class
Generic IEC 1000-4-28 Freq Vars Test Level 2.428_Vars Level 2
Generic IEC 1000-4-28 Freq Vars Test Level 3.428_Vars Level 3
Generic IEC 1000-4-28 Freq Vars Test Level 4.428_Vars Level 4
The user may create as many test files as desired using the data entry grid. Changes made can
be saved using the File, Save A
s… menu entry.
Figure 12-2: IEC 61000-4-28 Test Sequence