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Ground-to-Line indicates the MD is connected to measure the leakage current in the
line cord from the earth ground conductor back to the system neutral. This is referred
to as an PROTECTIVE CONDUCTOR CURRENT TEST.
Probe-HI to Line indicates the MD is connected between the PROBE HI terminal on
the instrument, which should be connected to the ENCLOSURE of the DUT, and the
system neutral. This is known as an TOUCH CURRENT TEST.
Probe-HI to Probe-LO indicates the MD is connected between the PROBE HI and the
PROBE LO terminals on the instrument which allow the operator to connect the MD
between applied parts.