M4000 Insulation Analyzer User Guide
72A-1230 Rev. F 1-3
July 22, 2005
polarity reversal technique to reverse the effects of electrostatic interference.
Selecting the Line Frequency Modulation Mode of operation will synchronize
the time base generator to the crystal oscillator. Two tests will be run for each
programmed test sequence. The first test is run at a frequency of 57 Hz and the
second test is run at 63 Hz. The measured test results of each test are combined
and averaged to give a 60 Hz equivalent test result. When operating in the 50
Hz frequency, the same technique will apply. The first test will run at 47 Hz,
and the second test will run at 53 Hz. This mode of test eliminates electrostatic
interference from measurement, by avoiding measurement at power line
frequency. It is also possible to select ± 10% of power line frequency as well.
Safety circuits have been designed into the M4100 instrument to ensure safety
of personnel. High voltage will not be supplied by the instrument if either of
the following circuits and conditions are not satisfied:
• The ground safety circuit verifies that the #6 bare copper safety
ground, which is attached from the instrument to the apparatus earth
ground, is at the same potential as the power supply ground.
• Two safety switches must be attached to the M4100 instrument front
panel and in the closed or depressed position prior to testing. One
switch is held by the M4000 Insulation Analyzer operator and the
second switch is held by a safety supervisor. The M4100 can be
configured to require both switches to be opened between test
sequences for the M4000 Insulation Analyzer to operate. Release of
one or both switches will terminate the test sequence and high voltage
potential.
A safety strobe light can be used in conjunction with the instrument and is
plugged into the front panel of the M4100. Whenever high voltage potential is
applied from the M4100, the safety strobe light will be energized and flashing.
Safety strobe connection will be required in order to operate the M4000
Insulation Analyzer, unless the default system configuration has been
modified to allow for the absence of a safety strobe. In this case, the strobe
connector can be removed from the M4100 front panel.
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