GE LOGIQ 7 Service Manual page 378

GE H
EALTHCARE
D 2286865, R
IRECTION EVISION
10-7-6-2 Generic Procedure
Measurements should be made with the ground open and closed, with power line polarity normal and
reversed, and with the unit Off and On. For each combination, the operating controls such as the lead
switch should be operated to find the worst case condition.
The connection is at service entrance
or on the supply side of a separately
derived system
H (Black)
POWER
OUTLET
N (White)
G (Green)
Building
ground
Grounding contact switch (use in both
"open" and "closed" positions)
10-7-6-3 Dale 600 Meter Procedure
The Dale 600 provides five snap type ECG buttons for testing patient leads. Snap on all patient leads
to the meter and assure that the ground clip is connected to the system's ground terminal. Select the
meter's LEAD-GND function. Select and test each ECG lead positions (except "ALL") of the LEAD
selector, testing each to the power condition combinations found in "PATIENT LEAD LEAKAGE" table
in the "PM CHECKLIST". Record the highest leakage current measured for each Power selection.
Line voltage is applied to the ECG leads during this test. To avoid possible electric shock
CAUTION
hazard, the system being tested must not be touched by patients, users or anyone while the ISO
TEST switch is depressed. When the meter's ground switch is OPEN, don't touch the unit!
Follow these steps to test the ECG module for leakage current.
1.) Turn the LOGIQ™ 7 unit OFF.
2.) Plug the unit into the meter, and the meter into the tested AC wall outlet.
3.) Plug the black chassis cable into the meter's "CHASSIS" connector and attach the black chassis
cable clamp to an exposed metal part of the LOGIQ™ 7 unit.
4.) Connect the patient leads to the corresponding snaps located at the upper front of the Dale 600/
600E. Lead nomenclature for this test is not important.
10-20
14
Appliance power switch
(use both "off" and "on" positions)
Polarity reversing switch
(use both positions)
Current meter
Figure 10-7 Test Circuit for Measuring Non-Isolated
Patient Leads
Section 10-7 - Electrical Safety Tests
Appliance
H
N
Internal
G
circuitry
Insulating surface
LOGIQ™ 7 S
ERVICE
Patient lead selector switch (if any)
(activated as required)
Patient connected leads
Between each patient
lead and ground
H = Hot
N = Neutral (grounded)
G = Grounding conductor
M
ANUAL