GE MEDICAL SYSTEMS
D
IRECTION 2392751-100, REVISION 3VIVID™ 4 SERVICE MANUAL
10-22 Section 10-3 - Periodic Maintenance Schedule
10-7-5 Chassis Current Leakage Test
10-7-5-1 Definition
This test measures the current that would flow in a grounded person who touched accessible metal
parts of the bedside station, if the Ground wire should break. The test verifies the isolation of the power
line from the chassis.
The meter is connected from accessible metal parts of the case to Ground. Measurements should be
made with the unit ON and OFF, with the power line polarity Normal and Reversed. Record the highest
reading.
DANGER: Electric Shock Hazard.
When the meter's Ground switch is OPEN, do not touch the unit!
CAUTION: To avoid damaging the unit, never switch the polarity and the neutral status when the unit
is powered ON. Be sure to turn the unit power OFF before switching them using the Polarity switch
and/or the Neutral switch.
10-7-5-2 Generic Procedure
The test verifies the isolation of the power line from the chassis. The testing meter is connected from
accessible metal parts of the case to Ground. Measurements should be made with the unit ON and
OFF, with the power line polarity Normal and Reversed. Record the highest reading of current.
When using the Microguard or a similar test instrument, its power plug may be inserted into the wall
outlet and the equipment under test be plugged into the receptacle on the panel of the meter. This
places the meter in the grounding conductor and the current flowing from the case to Ground will be
indicated in any of the current ranges. The maximum allowable limit for chassis source leakage is shown
in Table 10-14 on page 10-19.
Figure 10-3 Set Up for Chassis Source Current Leakage, IEC 601-1 Clause 19
Continuous Current Leakages and Patient, Auxiliary Currents
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