Operating Instructions - Circutor MI-20KVe Guia Del Usuario

Operating instructions

1. Be sure that there are no voltage differences between the points at which the insulation tester will be connected, nor
between them and ground. Caution: The insulation tester is inhibited to generate test voltage while it is connected to
mains. Therefore, the power cable has to be unplugged from mains prior to press the start button.
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 20 kV#, 15 kV$, 10 kV% or 5 kV&, V terminal in accordance
with the desired test voltage.
4. Connect the black cable to the –R' insulation tester terminal (see fig. 2).
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 insulation tester can reach a high potential that may result in an unstable non reliable reading. If both termi-
nals are simultaneously connected to ground, there is a short-circuit between them and consequently the insulation
tester will measure with error.
ELEMENT TO BE MEASURED
BLACK
BNC CONECTOR
Los terminales cocodrilo en el dibujo son meramente ilus-
trativos pudiendo haber diferencias entre éstos y los que
verdaderamente acompañan al equipo dependiendo de las
opciones hechas durante la compra de este megóhmetro.
20
RED
CLIP
BLACK
CLIP
RED PIN
fig. 2