Operating Instructions - Circutor MI-10KV Technical Specifications And Operating Instructions

M I-10KV

OPERATING INSTRUCTIONS

1) Be sure that there are no voltage differences between the points at
which the megohmmeter will be connected, nor between them and
ground.
2) Determine the value of test voltage to be used in the insulation
resistance measurement.
3) Connect the red banana pin of the red cable to the 1.000, 2.000,
5.000 or 10.000 V terminal in accordance with the selected test voltage.
4) Connect the black cable to the -R megohmmeter terminal and the
yellow terminal to terminal G.
5) The green GUARD terminal is not always used. Technical Note #32
explains the use of GUARD terminal in order to minimizing the effect of
stray resistances. When measurement is carried out between parts
which none of them is grounded, (like between high-side and low-side
windings of a transformer), GUARD terminal must be connected to
ground in order to fix the apparatus potential. At any time a
measurement is performed, either the "-R " or GUARD terminals
must be connected to ground but never both simultaneously. If
none of these terminals are connected to ground, the megohmmeter
can reach a high potential that may result in an unstable non-reliable
reading. If both terminals are simultaneously connected to ground,
there is a short-circuit between them and consequently the
megohmmeter will measure with error.
6) Connect the free ends of cables (alligator clips) to the element to be
measured.
7