GE Medical Systems marquette Dash 2000, Service Manual, Page: 68 / 202

Maintenance: Electrical Safety Tests
3-22 DASH 2000 Patient Monitor Revision A
2000 412-001
7. Set the polarity switch on the leakage tester to RVS (reverse).
8. 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.
9. Set the leakage tester power switch to OFF.
NOTES
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.
Power cord
NORM
RVS
HIGH
LOW
GND
Device
under
test
P
o
w
er cord
GND
M.D.
(Measuring Device)
Leakage Tester
Partial Schematic