GE Medical Systems marquette Dash 2000, Service Manual, Page: 69 / 202

Maintenance: Electrical Safety Tests
Revision A DASH 2000 Patient Monitor 3-23
2000 412-001
Enclosure Leakage
Current Test 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:
¥ Selector knob Ð 2,
¥ GND switch Ð OPEN,
¥ Polarity switch Ð 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 the appropriate specification below, the device under
test fails and should be repaired and tested again.
¥ 300 microamperes (0.3 volts on the DMM), and the device under
test is powered from 100 Ð 120 V / 50 Ð 60 Hz
¥ 300 µA (0.3 volts on the DMM), and the device under test is
powered from a centered-tapped 200 Ð 240 V / 50 Ð 60 Hz, single
phase circuit
¥ 500 µA (0.5 volts on the DMM), and the device under test is
powered from a non-center-tapped, 200 Ð 240 V / 50 Ð 60 Hz,
single-phase circuit
NOTE
Center-tapped and non-center-tapped circuits produce
different leakage currents and the UL and IEC limits are
different.
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 the appropriate specification below, and the device
under test is powered from 100-240 V/50-60 Hz, the device under test
fails and should be repaired and tested again.
¥ 100 microamperes (0.1 volts on the DMM), and the device under
test is powered from 100-240 V/50-60 Hz
8. Set the polarity switch to RVS and observe the same meter readings
as in the previous step.