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18
170X4
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All units that are returned for service or repair must pass the
original manufactures safety tests. Safety testing requires both
Hipot
Ground Continuity
and
HI-POT TEST INSTRUCTION
1. Application requirements
1.1 All mains operated products must pass the Hi-Pot test as
described in this instruction.
1.2 This test must be performed again after the covers have
been refitted following the repair, inspection or modification
of the product.
2. Test method
2.1 Connecting conditions
2.1.1 The test specified must be applied between the parallel-
blade plug of the mainscord and all accessible metal
parts of the product.
2.1.2 Before carrying out the test, reliable conductive
connections must be ensured and thereafter be
maintained throughout the test period.
2.1.3 The mains switch(es) must be in the "ON" position.
2.2 Test Requirements
All products should be HiPot and Ground Continuity tested as
follows:
Condition
HiPot Test for
products where
the mains input
range is Full
range(or 220V
AC)
Test
2820VDC
voltage
(2000VAC)
Test time 3 seconds
(min.)
Trip
set at 100 uA
current
for Max.
(Tester)
limitation; set
at 0.1 uA for
Min. limitation
Ramp
set at 2
time
seconds
2.2.1 The test with AC voltage is only for production purpose,
Service center shall use DC voltage.
2.2.2 The minimum test duration for Quality Control Inspector
must be 1 minute. No breakdown during the test.
2.2.3 The test voltage must be maintained within the specified
voltage + 5%.
2.2.4 The grounding blade or pin of mains plug must be
conducted with accessible metal parts.
Safety Test Requirements
testing.
HiPot Test for
Ground Continuity
products where
Test requirement
the mains input is
110V AC(USA
type)
1700VDC
Test current:
(1200VAC)
25A,AC
Test time:
1 second
3 seconds(min.)
Resistance
required:
5 mA
<=0.09+R ohm,
R is the
resistance of
the mains cord.
3. Equipments and Connection
3.1. Equipments
For example :
- ChenHwa 9032 PROGRAMMABLE AUTO SAFETY
TESTER
- ChenHwa 510B Digital Grounding Continuity Tester
- ChenHwa 901 (AC Hi-pot test), 902 (AC, DC Hi-pot test)
Withstanding Tester
3.2. Connection
* Turn on the power switch of monitor before Hipot and
Ground Continuity testing.
(ChenHwa 9032 tester)
Connect the "video cable"
or "grounding screw"
to the CLIP on your tester.
Connect the power cord
to the monitor.
4. Recording
Hipot and Ground Continuity testing records have to be kept for
a period of 10 years.
Clip
Clip
Video cable
Grounding screw
Power outlet
(Rear view of monitor)
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