4
IM CL155
2.2.1 AC Current Measurement (Normal Mode)
(1) Set the Function Selector switch to the " 400A" or " 2000A" position.
"AC" should be shown on the upper left corner of the display.
(2) 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.
NOTE
●
During current measurement, keep the transformer jaws fully closed.
Otherwise, accurate measurement cannot be made. The maximum
measurable conductor size is approx. 54.5mm in diameter.
●
The transformer jaws may buzz when measuring large current. This has no
effect on the instrument s performance or safety.
2.2.2 Peak Current Measurement (Peak Mode)
(1) Set the Function Selector switch to the " 400A" or " 2000A" position.
(2) Press the
button once to enter from the normal mode to the PEAK
mode. "
" should be shown on the display.
(3) Press the open/close lever to open the transformer jaws and clamp them
onto the conductor under test. Then, press the
button.
(4) The display shows the current s crest value divided by the square root of
two. Therefore, when the current is sinusoidal, the reading equals RMS
value.
(5) To reset the display, press the
button.
(6) After the measurement is over, press the
button to return to the
normal mode.
NOTE
●
In the Peak measurement mode, the data hold feature is disabled.
●
In the Peak measurement mode, the response time is 10ms.
