Advertisement
1 Precautions
To Exposed
Metal Parts
AC Voltmeter
Test Probe
To Known
Earth Ground
Figure1-1. Leakage Current Test Circuit
To be sure that no shock hazard exists, check
for leakage current in the following manner:
a.
Plug the AC line cord directly into a 120
Volt AC outlet. (Do not use an isolation
transformer for this test)
Using two clips leads, connect a 1.5k ohm,
10 watt resistor paralleled by a 0.15pF
capacitor in series with an exposed metal
cabinet part and a known earth ground,
such as an electrical conduit or electrical
ground connected to an earth ground.
Use a SSVM or VOM with 1000 ohms
per-volt or higher sensitivity to measure
the AC voltage drop across the resistor
(see Figure 1-1).
Connect the resistor to an exposed metal
part having a return path to the chassis
(metal cabinet, screw heads, knobs, shafts,
escutcheon, etc.) and measure the AC
voltage drop across the resistor.
Any reading of 5.25 Volt RMS (this
corresponds to 3.5 milliampere AC) or
more is excessive and indicates a potential
shock hazard. Correct the shock hazard
before returning the monitor to the user.
1415 Product Safety Notices
Some electrical and mechanical parts have special
safety-related characteristics which are often not
evident from visual inspection. The protection
they give may not be obtained by replacing them
with components rated for higher voltage,
wattage, etc. Parts that have special safety
characteristics are identified by ZX on schematics
and parts lists. A substitute replacement that does
not have the same safety characteristics as the
recommended replacement part might create
shock, fire and / or other hazards. Product safety
is under review continuously and new in
structions are issued whenever appropriate.
Samsung Electronics SyncMaster 15GLi
Advertisement
