KYORITSU 2434 - Manual (Page 6)

6-1 Leakage Current Measurement
(1)Set the Range Selector Switch to the desired position. Current
to measure should be within the selected measuring range.
(2)Measuring out of balance leakage current (See Fig.1):
Clamp onto all conductors except a grounded wire. Measured
current value is shown on the display.
(3)Measuring earth leakage current (See Fig.2):
Clamp onto a grounded wire.Measured current value is shown on
the display.
6-2 How to Use Frequency Selector Button
When high frequencies from such equipment as inverters are
present in the circuit under test, the instrument measures AC
current of not only 50Hz or 60Hz of fundamental frequency but also
of these high frequencies and harmonics.
To eliminate the effect of such high frequency noise and measure
AC current of 50Hz or 60Hz fundamental frequency, a "high-cut"
filter circuit in incorporated into the instrument which works when
"50/60Hz" frequency response is selected with the Frequency
Selector Button. Cut-off frequency of the "high-cut" filter is about
160Hz with attenuation characteristic of approx. -24dB/octave.
When the Frequency Selector Button is pressed, "50/60Hz" mark is
shown on the left side of the display. When the Frequency Selector
Button is pressed again, frequency response is switched to WIDE
with "WIDE" mark shown on the display.
Fig.2 Measuring earth leakage current
Fig. 1 Measuring out of balance leakage current
3-phase 3-wire system
(In 4-wire system with neutral,
clamp onto all 4 wires) Single-phase 2-wire system
(in 3-wire system with neutral,
clamp onto all 3 wires)
Load Load
Load
Grounded wire