Running a GST-Guard Test
3-14 72A-1230 Rev. F
July 22, 2005
10. When the message, “Test Done, Line (x)”, where (x) is the selected line
number, press the F5 key to accept results. The mA, Watts, Percent Power
Factor, and Capacitance/Inductance is recorded on the clipboard sheet.
11. At this point, a reversal could be run for this line (x). To do this, repeat
steps 5 through 10, selecting the same line number, and selecting
“Reversal”. Since performing reversals requires reversing the leads on the
external source, it will be practical to perform a series of Normal tests first,
and then go back, reverse the leads to the external source, and perform a
series of Reversal tests corresponding to the Normal tests.
12. Once you have pressed F5 to save the reversal results, the line(s) that
contain both Normal and Reversal data will be check-marked in the CR
column. If you are testing indoors, it is unlikely you will need to perform
Reversal Tests.
Running a GST-Guard Test
1. Select “External Reference” from “Mode” on the M4000 menu bar, or
click the External Source icon.
2. There are two test types: UST Measure Blue and GST Guard Blue. Select
GST Guard Blue from the Test Mode column.
3. There will be one clipboard sheet per test sequence with a maximum
number of tests in a sequence of 12.
4. Before running a test, enter the capacitance and power factor of the
reference capacitor, and the maximum test voltage.
5. Start a test by selecting Test from the menu bar, or by pressing F2, or by
clicking one of the lightning bolt icons (single or multiple tests can be
run). The line frequency will be measured and recorded.
6. You will be prompted to select a line number on which to place test
results, either a Specimen Test or Setup Correction Test (the first test for a
given line is by default a Specimen Test), and either the Normal or
Reversal mode (the first test for each line is by default a Normal mode
test).
7. The safety screen is displayed with your selected settings. When you are
ready to begin the test, select the Continue button.
WARNING For the External Source Test Mode, safety switches and the strobe light
are not used. The External Source voltage is not controlled by the M4000.
Proper safety precautions must be taken.
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