AMETEK MX CTSH - Manual (Page 72)

California Instruments Revision H 72
User Manual MX Series CTSH Compliance Test System
5.7.1 Entering User and/or Customer Data
Prior to running a test, you should enter information concerning the EUT, the person or department
performing the test and any other information that may be relevant to interpreting or using the test results
obtained from the CTS system. Several fields are provided for this purpose along the bottom of the main
test window. If the test is performed on behalf of a third party, the customer data field may be used to
document the customer name.
The information entered in these fields is added to the test data file and any reports that are printed. The
date and time of the test run are automatically added based on the PC’s real-time clock.
5.7.2 Selecting the Test Period
The test period should be set appropriately for the test mode selected and the EUT at hand. For details on
setting the correct harmonics test time, refer to paragraph 5.4. For flicker tests, the default is 10 minutes.
You can increase the test time up to 24 hours if needed.
5.7.3 Setting the Test Margin
The CTS system offers the user the choice of setting a test margin around the IEC limits. This means a
user specified factor can be applied to the IEC test limits. The default value used is 100 % which essentially
means the actual IEC limits are applied to determine a pass or fail result. This is the mode to use for actual
compliance testing.
Setting this margin to a value below 100 % can be useful for pre-compliance testing. Selecting a lower
margin means the test is more stringent. If the EUT can pass the more stringent test, it is more than likely to
pass when submitted to an independent test lab. Setting the margin above 100 % means you are
“loosening” the limits allowing EUT’s to pass that would normally fail. This mode is not recommended.
5.8 Running the Harmonics Test
Before starting a test, make sure all user fields are set correctly. Changes to these fields are no longer
possible once a test is in progress. Also make sure the EUT is connected to the AC output of the PACS-3-
75 unit and the correct AC line voltage is programmed on the AC source.
A test run is started by clicking on the Start button. During test execution, the “% of test completed” field on
the left of the main window displays the percentage of the test that has been completed. Once this number
reaches 100 %, the test will terminate normally. If you click on the Stop button instead, it will display the
point at which the test was aborted.
During the test execution, the CTSMXH Software will continuously evaluate the EUT current harmonics
against the appropriate class limits. The Pass or Fail indication is updated in real-time. If the test fails early
in a long test period, you may elect to abort the test prematurely rather than waiting till the end.
5.8.1 Voltage and Current Waveform Graphs
The top graph continuously displays two signal periods of the AC voltage (yellow) and current (green)
waveforms. For Classes A and D tests, it also shows the special current wave shape template in red.
Alternate display modes can be selected from the drop down combo at the top of the graph.
5.8.2 Voltage and Current Harmonics Graphs
The bottom graph serves a dual purpose. During the test run, it can be used to show either the current or
the voltage harmonics. In either mode, the IEC test limits are displayed using a red line for the current
harmonic limits and a green line for the voltage harmonic limits.