Hioki 3144-20, Manual

Page: 40 / 118

Chapter 2 Measurement Preparations
36
Connect the ground terminal of the 9741 CLAMP
ON VOLTAGE SENSOR or 3144-20 NOISE
SEARCH TESTER to ground.
The noise detected when using the 9741 is that in
a common mode which exists between communi-
cation lines/power supply lines and the earth. By
connecting that terminal to ground, noise against
the earth can be detected.
Moreover, ground connection reduces the influ-
ence of the surroundings (coupling with metallic
materials in the surroundings), excluding the cable
being measured, by means of the shielding effect.
2.6 Connecting to Ground
Failure to connect the instrument to ground would
make the measurement susceptible to effects from
objects other than the cable being measured, thus
making it impossible to conduct correct measure-
ment.
1.
Loosen the screw of the 9741
ground terminal and pass the
ground wire through the earth-
ing hole.
2.
Tighten the screw to lock the
ground wire.
3.
Connect the other end of the
ground wire to ground.
Required tools: Ground wire
About ground wires
Applicable wires: Solid or stranded wire 2.1 mm or less in
diameter
Connecting the 9741 CLAMP ON VOLTAGE SENSOR
to ground
Earthing hole
Ground terminal
screw