Chapter 2 Before Use
2-34
Follow the procedure below to check for electrical overstress to the
MP2110A before connecting DUT (Device Under Test).
Checking the ground connection using a tester
1. Connect DUT and the ground terminal of the MP2110A with a
ground wire.
2. Turn on the power to DUT and MP2110A without connecting DUT to
the I/O connectors of MP2110A.
3. Measure the voltage between DUT’s ground structure and ground
terminal of MP2110A with a tester in AC mode, and confirm the
voltage is 0 V.
If the voltage measured in step 3 is not 0 V, there is a possibility that
MP2110A and DUT may not be connected to a common ground. In this
condition, do not connect the I/O connectors of MP2110A and DUT.
Failure to do so may cause damage to MP2110A due to a voltage
exceeding a rated value.
Review the ground wiring by, for example, changing the location of the
DUT’s ground wire connected to MP2110A so that the voltage measured
in step 3 to be 0 V.
Notes:
If it is impossible to connect a ground wire to DUT, follow the
instructions below so that the voltage to be measured in step 3
becomes 0 V.
•
Check that the 3-pin power cords described in 2.3.2 “Connecting
Power Cord” are used for the MP2110A and DUT.
When the 3-pin power cords are used, take the following actions:
•
There may be a disconnection in the ground terminal of the used
power cord. Replace it with a different 3-pin power cord.
•
There is a possibility that the ground terminal inside the AC
outlets to which the 3-pin power cords of MP2110A and DUT are
connected is not connected to ground. Connect the 3-pin power
cords to different AC outlets.
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