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1.3 Leakage Current Hot Check (See
Fig. 1
)
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1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this
check.
2. Connect a 2k
Ω
, 10W resistor, in series with an exposed metallic part on the projection monitor
and an earth such as a water pipe.
3. Use an AC voltmeter, with high impedance type, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of the above measurements.
6. The potential at any point should not exceed 1.0V rms. In case a measurement is outside of the
limits specified, there is a possibility of a shock hazard, and the projection monitor should be
repaired and rechecked before it is returned to thecustomer.
repaired and rechecked before it is returned to thecustomer.
Fig. 1
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