AMETEK MX CTSH - Manual (Page 117)

User Manual MX Series CTSH Compliance Test System
California Instruments Revision G 114
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
Figure 12-2: EN 61000-4-28 Test Sequence
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\Mxgui\IEC_Test
The following four EN 61000-4-28 test files are distributed with the MXGUI 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 As… menu entry.
Fnom =50 Hz
Repeat = 3
Delay =
60 secs
Test
Level =
-15 %
Level
Repeat = 2
Delay =
60 secs
Ttrans =
1 sec Hold Time=
120 secs