Sourcetronic MD-5060 Series, Руководство пользователя

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The test leads in the picture are merely illustrative.
3. The G (GUARD) terminal can be used or not, according to the
measurement that is going to be carried out.
IMPORTANT :
During measurements, the equipment must be electrically referred to
earth in order prevent the equipment from being on a high potential,
which may produce unstable readings. When insulation is measured
regarding grounding, the
R terminal is connected to earth and the
condition by means of which the equipment potential setting is
fulfilled. If the measurement is performed between two parts, which
are not grounded (for example, between two phase conductors in a
tree-phase cable), the megohmmeter GUARD terminal must be
grounded. This implies that
whenever a measurement is
performed, one of the GUARD or R terminals must be grounded,
but not both of them simultaneously.
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