Hioki FT6380 Manual De Instrucciones página 32

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2.4 Measurement Procedure
• Do not measure the same location with two or more
Clamp On Earth Testers at the same time. The instru-
ments will interfere with each other, preventing accu-
rate measurement.
• Verify that the
When the current flowing through the grounding wire is high
(approximately 2.5 A or greater with a commercial frequency
of 50/60 Hz, approximately 100 mA or greater with a har-
monic component of 1 kHz), the current will affect measured
values, making it impossible to measure the resistance.
Check the current flowing through the grounding wire.
*The current level at which the
individual differences as well as the frequency. The closer to
the injected signal frequency, the smaller the noise current
that will affect operation.
• Open display
The screen will show [OPEn] if the clamp is not com-
pletely closed. Close the clamp completely and repeat
the measurement.
*If an extremely large current is flowing through the grounding
wire or a DC current is superposed, the screen may display
[OPEn]
signal a malfunction. Check the current flowing through the
grounding wire by using the instrument's current measure-
ment mode or an instrument such as a clamp tester capable
of DC current measurement.
• Inductor mark
If the [
during measurement, there may be a short in the
ground wire. It is recommended to verify that there are
no shorts in the location being measured.
• Capacitance mark
If the [
during measurement, there may be a break in the
ground wire. It is recommended to verify that there are
no wiring breaks in the location being measured.
[ ]
Short
R
x
mark is not lit up.
even if the clamp is completely closed. This does not
] mark next to the resistance mark light up
] mark next to the resistance mark light up
R
R
1
x
mark lit up depends on
[ ] Break
R
x
R
R
1
x