4
IM CL255
2. Measurement
2.1 Preparation for Measurement
CAUTION
● The jaw section is a delicate, precision sensor. Do not subject the jaw
to unreasonably strong shock, vibration, or force when using it.
● If dust gets into the tops of the jaws, remove it immediately. Do not
close the jaws when dust is trapped in its joints as the sensor may
break.
● Please check that the Function Selector switch is set to the desired
posi-tion before measurement.
2.2 DC Current Measurement
WARNING
● Do not make measurement on a circuit above 1000VDC. This may
cause shock hazard or damage to the instrument or equipment under
test.
● Do not make current measurement with the test leads connected to the
Hi and Lo terminals.
● Keep your fingers and hands behind the barrier during measurement.
(1) Set the Function Selector switch to the "
A " position. "DC" should
be shown on the upper left corner of the display.
(2) With the transformer jaws closed and without clamping them onto the
conductor, press the
button for about one second to zero adjust
the display. (Zero adjust feature is for 400A range only.) When zero
adjustment is completed, "
" appears on the display.
(3) Press the open/close lever to open the transformer jaws and clamp
them onto the conductor under test, then take the reading on the
display. The most accurate reading will be obtained by keeping the
conductor at the center of the transformer jaws.
