GE Eagle 1000, Servicing Instructions

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GE Medical Systems EAGLE 1000
Page 83
Information Technologies
Servicing Instructions 227 468 01 Rev. G
3.4.3 Protective Earth Resistance Test
This test determines whether the monitor has a power ground fault.
- The protective earth resistance from power connector to any grounded exposed metal
surface is measured.
- Specs. of test circuit: AC current source 50 Hz/60 Hz of at least 10 A up to 25 A with
limited output voltage of 6 V.
- If resistance is greater than 100 mOhm, the unit fails this test.
3.4.4 Leakage Current Measurement
To perform the suggested measurements, the unit under test has to be separated from
any interconnection to a system. If the unit is part of a system, extended tests according to
IEC 601-1-1 have to be performed. If the unit is connected to a SynOpsis also proceed
3.4.4.3. The following diagram shows the Measuring Circuit [ M ] required for leakage cur-
rent. The reading in mV corresponds to
µ
A (leakage current). The Safety Testers generally
work with this Measuring Circuit [ M ] and the displayed values are already converted to
leakage current.
3.4.4.1 Enclosure Leakage Current Test
This test is performed to measure leakage current from chassis to ground during normal
conditions (N.C.) and single fault conditions (S.F.C.).
In all cases, the leakage current is measured from any exposed conductive parts to
ground, the unit under test has to be switched on.
Connect the unit under test to your Safety Tester.
- During normal conditions (N.C. ), referrfing to the electrical diagram, measurements
have to be done under the following conditions:
* Polarity switch NORM and RVS
* GND switch GND closed
* S1 closed
- During single fault conditions (S.F.C.), referring to the electrical diagram, the measu-
rements have to be done under following conditions:
* Polarity switch NORM and RVS
* GND switch GND open
* S1 closed
mV
10 k
1 k
0,015
µ
F
Measuring
instrument/
Calibrator
( R
i
>1 M
Ω)