4-7
IM CW500-01EN
NG Judgment
Wiring Check
Closing the test results causes the NG
values and vectors to blink. If everything
is OK, the ideal vector diagram will be
displayed in the lower left corner.
Wiring Check Criteria and Failure Cause
Check
Judgment Criteria
Failure Cause
Frequency
• The V1 frequency is
between 40 to 70 Hz.
• The voltage clip is not firmly connected
to the DUT.
• Harmonic components are large.
AC
voltage
input
• AC voltage input
is 10% of (nominal
voltage × VT) or
higher.
• The voltage clip is not firmly connected
to the DUT.
• Voltage probe is not correctly inserted
into the AC voltage input terminal of
this instrument.
Voltage
balance
• AC voltage input
is within ±20% of
reference voltage V1.
* Not checked for
single-phase wiring
• Settings are not appropriate for the
measurement line wiring system.
• The voltage clip is not firmly connected
to the DUT.
• Voltage probe is not correctly inserted
into the AC voltage input terminal.
Voltage
phase
• AC voltage input
phase is within ±10%
of the reference value
(appropriate vector).
• Voltage probe is not connected
correctly.
(The connected channel is incorrect.)
Current
input
• Current input is 5% or
higher and 110% or
less of (current range
× CT).
• Current clamp-on probe is not
correctly inserted into the AC power
input terminal of this instrument.
• Current range setting is too high or
too low for the input level.
Current
phase
• Power factor (PF,
absolute value) of
each channel is 0.5
or higher.
• Active power (P)
of each channel is
positive.
• Current direction mark of the current
clamp-on probe is not matched with
the current-to-load direction.
• Clamp-on probe is not connected
correctly.
4.2 Starting to Record with “Quick start guide”
