Hioki 3153 - Connection to the Measured Equipment

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2.9 Connection to the Measured Equipment
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DANGER
Observe the following precautions to avoid electric shock.
Make sure that no high voltage is being applied to the output, confirm
the following items, and connect the H.V. TEST LEAD.
(1) The analog voltmeter reads 0 kV.
(2) The
DANGER
lamp is OFF.
(3) The
READY
lamp is lit (it is off in the Double Action mode).
In the TEST state, never touch the output-voltage terminal, H.V. TEST
LEAD, or tested object.
Even following a test, there may be a residual voltage at the output
terminal. Therefore, before touching the output-voltage terminal, H.V.
TEST LEAD, or tested object, make sure that no high voltage is being
applied between the output terminals.
NOTE
Note that taking measurements or routing cables in a humid location may cause
errors in insulation-resistance tests.
If the HIGH and LOW voltage output terminals short-circuit or a dielectric
breakdown occurs in the tested object during the test, noise will be generated and
such noise may lead to a malfunction of this unit or of a nearby electronic device.
If this problem occurs, connect a ferrite core or a resistor to the H. V. TEST
LEAD (high voltage side).
When using a resistor, choose one appropriate for the power rating and withstand
voltage. Also, be alert to any drop in test voltage.
Beware of electric shock when connecting the resistor.
Do not the test lead and the EXT/IO cable arranged closely to each other.
Doing so may lead to a malfunction of the external control due to a noise.
Additionally, if the test lead touches to other metallic parts, it may cause an
increase in leakage current.
Prevent the test lead from coming into contact with other parts as much as
p
ossible.
2.9 Connection to the Measured Equipment
1. Make sure the analog voltmeter is at 0 kV and the
DANGER
lamp is OFF.
2. Make sure the unit is in the READY state with the
READY
lamp ON (it is
OFF in the Double Action mode).
3. Connect the LOW terminal probe to the tested object. Fasten the probe
securely to prevent it from loosening during a test.
4. Following the procedure described above, connect the HIGH terminal
probe to the tested object.