TOS93 Series User’s Manual 37
Installation
Connection for Leakage Current Tests
Applicable models:
Using the insulation transformer
Some standards recommend an insulation transformer to be used in leakage current tests.
If unexpected current flows during a test due to a an EUT malfunction or the like, other devices in the
same facility may shut down as a result of the earth leakage circuit breaker tripping. This may cause seri-
ous accidents.
Inserting an insulation transformer in the power supply line for the EUT insulates the EUT from the earth
leakage circuit breaker. This keeps the earth leakage circuit breaker from tripping even if unexpected cur-
rent flows and prevents other devices from being affected.
Connecting the EUT to the power supply
Power is supplied to the EUT through this product. The EUT input rating needs to meet the following
power supply input rating for the EUT.
• Input voltage range: 85 V to 250 V
• Frequency: 50 Hz or 60 Hz
• Maximum power: 1500 VA
• The current rating of the supplied power cord is 10 A. To prevent fire, if the input
current to the connected EUT exceeds 10 A, change the cord to an appropriate one.
Risk of electric shock.
• Before connection, be sure to remove the power cord for the EUT from the AC LINE
IN inlet, and then connect the EUT to the AC LINE OUT terminal block first.
• Before connecting, be sure to set Line OUT (p.242) to OFF.
• To keep the terminals of the AC LINE OUT terminal block from being exposed, be
sure to attach the terminal cover. The voltage applied to the AC LINE IN inlet
appears at the AC LINE OUT terminal block. When you measure the touch current
when the EUT’s protective ground wire is disconnected, dangerous voltage may be
applied to the ground terminal of the AC LINE OUT terminal block.
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