-
Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
-
Connect a 1.5 kΩ, 10 W resistor, in parallel with a 0.15 μF capacitor, between each exposed metallic part on the set and a good earth ground, as shown in Figure 1.
-
Use an AC voltmeter, with 1 kΩ/V or more sensitivity, to measure the potential across the resistor.
-
Check each exposed metallic part, and measure the voltage at each point.
-
Reverse the AC plug in the AC outlet and repeat each of the above measurements.
-
The potential at any point should not exceed 0.75 V RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must not exceed 1/2 mA. In case a measurement is outside of thelimits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer.