Enclosure Leakage Current Test - GE Medical Systems Solar 9500 Service Manual

Enclosure Leakage Current Test

6-14
Maintenance: Electrical Safety Tests
127(
The DMM plus leakage tester network shown is the circuitry
defined by the UL 544 standard for measuring leakage current.
The measuring devices, defined by various standard
organizations (IEC, UL, etc.), produce almost identical test
measurement results.
Perform this test to measure current leakage through exposed conductive
surfaces on the device under test during normal operation.
1. Configure the leakage tester like the circuit shown below with GND
switch OPEN and polarity switch NORM.
Leakage Tester
HIGH
LOW
GND
1K
DMM
DMM set to measure AC voltage
2. Connect probe to an unpainted, non-anodized chassis ground on the
unit under test.
3. Set the power switch of the device to ON.
4. Read the current leakage indicated on DMM.
127(
Center-tapped and non-center-tapped supply circuits produce
different leakage currents and the UL and IEC limits are
different.
5. Set the polarity switch to RVS.
6. Read the current leakage indicated on DMM.
127(
If either reading is greater than the appropriate specification
below, the device under test fails. Contact GE Medical Systems
Information Technologies Technical Support.
Solar 9500 Information Monitor
2001085-061
NORM
RVS
Open
Closed
GND
0.15µF
10
Probe to exposed conductive chassis
Power Cord
Device
Under
Test
074A
Revision A