MEGABRAS MD-5060x Guia Del Usuario página 14

Step by step instructions
1. Check if there is no differences of potential voltage between the points
where the megohmmeter shall will be connected to, nor between them and
the ground.
2. Connect the red security terminal (red cable) to the megohmmeter (-V)
output terminal. (see figure 1)
3. Connect BNC terminal to the ZERO REFERENCE (+R) terminal and the
terminals to the element to be measured as indicated in the figure below.
4. The G (GUARD) terminal can be used or not, according to the measure-
ment that is going to be carried out.
megohmmeter must be electrically referred to earth in order prevent the equipment
from being on a high potential, which may produce unstable readings. When insula-
tion 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 meas-
urement is performed between two parts, which are not grounded (for example, be-
tween two phase conductors in a tree-phase cable), the megohmmeter GUARD ter-
minal 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 si-
multaneously. MEGABRAS Application Note 32 explains the usage of Guard termi-
nal for minimizing the parasite resistance effect, whose influence one intends to
minimize.
ELEMENT TO BE MEASURED
BLACK
CLIP
BLACK BNC
CONECTOR
RED CLIP
RED PIN
IMPORTANT: During measurements, the
16
The terminals in the
picture are merely
illustrative, so there can
be differences between
them and the ones
which really come with
the equipment.