Hioki 3155-01, Instruction Manual

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6.3 Enclosure Leakage Current Measurement Mode (for IEC/TR 60990)
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6.3.2 Connecting Equipment for Measurement Accompanying
IEC 60950 (1991-10) + am4 (1996-07)
CAUTION
・ Always use the insulating transformer for measurement accompanying IEC
60950 (1991-10) + am4 (1996-07).
・ The maximum current that can be input into the leakage current
measurement terminals of the 3155 is 25 mA (AC+DC). The input of any
larger current will cause the beeper to sound (when the beeper is turned on),
after which continued input may cause the fuse in the measurement network
to fail. In this case, input must be terminated immediately.
Afterwards, a fuse check is performed automatically upon returning to the
initial screen from the leakage current measurement mode. Therefore, do
not connect anything to leakage current measurement terminal T1. (If
anything is connected, the display may show "Measurement Network Fuse
blown.")
・ The rated capacity of the auxiliary power socket is 1500 VA or less. If this
capacity is exceeded, the auxiliary power outlet circuit breaker will actuate,
and the power supply to the equipment to be measured will be cut off.
(With the 3155-01, the main power switch is turned off.)
・ If enclosure leakage current is to be measured between the enclosure and
the power supply line, or the power of the equipment to be measured
exceeds 1500VA, make the connection directly to the outlet; do not use the
auxiliary power socket. (When measuring class
equipment, connect the
protective earth conductor of the equipment to be measured to the G
terminal of the 3155.)
In this case, the power source polarity and the condition of the equipment to
be measured cannot be set on the 3155.
・ The table tap is subject to line voltage. Watch out for electrical shocks.
・
In cases where the voltage is applied directly to the leakage current
measurement terminals of the the 3155 when making a measurement, the
measured value may be subject to synchronous voltage. In which case, an
accurate measurement cannot be obtained without first performing zero
adjustment. Always perform zero adjustment before measuring.
(1) Earth leakage current measurement
Measurement between the accessible conductive part or accessible non-
conductive part and the power line
No measurement is made for internally powered equipment.
1. On the enclosure leakage current measurement screen, set the contact
condition to "between the enclosure and the power line."
2. Plug the power cord of the equipment to be measured into a table tap.
3. Plug the table tap into an insulating transformer.