Enclosure (Chassis) Leakage Current Test - GE ApexPro Service Manual

Enclosure (Chassis) Leakage Current Test

4-14
Maintenance: Electrical Safety Tests
9. Set the leakage tester power switch to OFF.
127(
The MD (measuring device) is the circuitry defined by the appropriate
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. Set the leakage tester switches as follows:
‹
GND switch - OPEN,
‹
Polarity switch - NORM.
2. Connect a meter lead between the CHAS connector on the rear of the leakage
tester and an unpainted, non-anodized chassis ground on the unit under test.
3. Set the leakage tester power switch to ON.
4. Read the current leakage indicated on DMM. If the reading is greater than 3.5
mA the device under test fails and should be repaired and tested again.
5. Set the polarity switch to RVS and observe the same meter readings as in the
previous step.
6. Set the GND switch on the leakage tester to CLOSED.
7. Read the current leakage indicated on DMM. If the reading is greater than 3.5
mA the device under test fails and should be repaired and tested again.
8. Set the polarity switch to RVS and observe the same meter readings as in the
previous step.
9. Set the polarity switch to NORMAL and observe the same meter readings as in
the previous step.
ApexPro Telemetry Server
2001989-178
Revision C