GE Logiq 7 Service Manual

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
Section 10-7 - Electrical Safety Tests 10-13
10-7-2 GEMS Leakage Current Limits
The following limits are summarized for NFPA 99 (For USA) and IEC 60601-1 Medical Equipment 
Safety Standards. These limits are GEMS standards and in some cases are lower than the above 
standards listed.
 
 
NOTE: *Mains Applied refers to the sink leakage test where mains (supply) voltage is applied to the 
part to determine the amount of current that will pass (or sink) to ground if a patient contacted 
mains voltage.
The following tests are performed at the factory and should be performed at the site. These tests are: 
grounding continuity, chassis leakage current, probe leakage current, and ECG leakage current. All 
measurements are made with an electrical safety analyzer Model 600/600E built by Dale Technology 
Corporation or equivalent device. Table 10-14   Chassis Leakage Current Limits—Accessible Metal Surfaces
CountryNormal ConditionOpen GroundReverse PolarityOpen Neutral
USA N/A
0.3 mA 0.3 mA N/A
Other 0.1 mA
0.5 mA 0.5 mA 0.5 mA
Table 10-15   Type BF Applied Part Leakage Current Limits - Non-Conductive 
(Floating) Surface and Cavity Probes
Country
Normal 
Condition
Open GroundReverse PolarityOpen Neutral*Mains Applied
USA 0.05 mA
0.05 mA 0.05 mA 0.05 mA N/A
Other 0.1 mA
0.5 mA0.5 mA0.5 mA5.0 mA
Table 10-16   Type CF Applied Part Leakage Current Limits - Surgical Probes and 
ECG Connections
Country
Normal 
Condition
Open GroundReverse PolarityOpen Neutral*Mains Applied
USA 0.01 mA
0.05mA 0.05 mA N/A 0.025 mA
Other 0.01 mA
0.05 mA 0.05 mA0.05 mA0.05 mA 
						

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
10-14Section 10-7 - Electrical Safety Tests
10-7-3 Outlet Test - Wiring Arrangement - USA & Canada
Test all outlets in the area for proper grounding and wiring arrangement by plugging in the neon outlet 
tester and noting the combination of lights that are illuminated. Any problems found should be reported 
to the hospital immediately and the receptacle should not be used.
The Dale 600 has self-contained lamps designed for testing the outlet wiring arrangement. Plug the Dale 
600 into each outlet to be tested comparing the lamp status.
NOTE: No outlet tester can detect the condition where the Neutral (grounded supply) conductor and the  Grounding (protective earth) conductor are reversed. If later tests indicate high leakage currents, this 
should be suspected as a possible cause and the outlet wiring should be visually inspected. Figure 10-1 Typical Alternate Outlet Tester
Figure 10-2 Dale 600 Outlet Test
Combination of 
Lights
Condition
CORRECT WIRING REVERSE
POLARITY OPEN
GROUND OPEN
HOT HOT/GROUND
REVERSED 
						

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
Section 10-7 - Electrical Safety Tests 10-15
10-7-4 Grounding Continuity  
Measure the resistance from the third pin of the attachment plug to the exposed metal parts of the case. 
The ground wire resistance should be less than 0.2 ohms. Reference the procedure in the IEC 601-1.1.
10-7-4-1 Meter Procedure Follow these steps to test the ground wire resistance.
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 meters “CHASSIS” connector and attach the black chassis cable clamp to an exposed metal part of the LOGIQ™ 7 unit.
4.) Set the meters “FUNCTION” switch to the RESISTANCE position.
5.) Set the meters “POLARITY” switch to the OFF (center) position.
6.) Measure and record the ground wire resistance.
CAUTIONElectric Shock Hazard. The patient must not be contacted to the equipment during this test
Figure 10-3 Ground Continuity Test 
						

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
10-16Section 10-7 - Electrical Safety Tests
10-7-4-2 Dale 600 - Ground Continuity
The Dale 600 measures line cord resistance from the third pin of the attachment plug to the meter’s 
Chassis Cable clamp. Test the grounding continuity of the system to all exposed metal parts in 
accordance with the IEC 601-1.1 procedure as above. Refer to the Dale 600 Instruction Manual for 
meter self tests and operation. Record measured resistance of the grounding continuity. The ground 
wire resistance should be less than 0.2 (Use any safety analyzer.)
 
Figure 10-4 Dale 600 Ground Continuity Test 
						

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
Section 10-7 - Electrical Safety Tests 10-17
10-7-5 Chassis Leakage Current Test
10-7-5-1 Definition
This test measures the current that would flow in a grounded person who touched accessible metal 
parts of the bedside station if the ground wire should break. The test verifies the isolation of the power 
line from the chassis. The meter is connected from accessible metal parts of the case to ground. 
Measurements should be made with the unit On and Off, with the power line polarity Normal and 
Reversed. Record the highest reading. 
10-7-5-2 Generic Procedure The test verifies the isolation of the power line from the chassis. The testing meter is connected from 
accessible metal parts of the case to ground. Measurements should be made with the unit ON and OFF, 
with the power line polarity Normal and Reversed. Record the highest reading of current.
When using the Microguard or a similar test instrument, its power plug may be inserted into the wall 
outlet and the equipment under test is plugged into the receptacle on the panel of the meter. This places 
the meter in the grounding conductor and the current flowing from the case to ground will be indicated 
in any of the current ranges. The maximum allowable limit for chassis source leakage is shown in Table 
10-14.
CAUTIONElectric Shock Hazard. When the meters ground switch is OPEN, dont touch the unit!
CAUTIONEquipment damage possibility. Neve r switch the Polarity and the status of Neutral when the unit 
is powered ON. Be sure to turn the unit power OFF before switching them using the POLARITY 
switch and/or the NEUTRAL switch. Otherwise, the unit may be damaged.
Figure 10-5 Set Up for Chassis Source Leakage Current, IEC 601-1 Clause 19 - Continuos Leakage Currents and  Patient, Auxiliary Currents 
						

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
10-18Section 10-7 - Electrical Safety Tests
10-7-5-3 Dale 600 Meter Procedure
When measuring system chassis currents with the Dale 600, always use the CHASSIS selection of the 
external/chassis function switch. This requires the ground clip lead and changing the meters switches 
in accordance with the IEC 601-1.1. Refer to the Dale 600 Instruction Manual for meter self-test and 
operation. Record the highest leakage current measured.
Follow these steps to test the unit 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 meters “CHASSIS” connector and attach the black chassis cable clamp to an exposed metal part of the LOGIQ™ 7.
4.) Set the testers “FUNCTION” switch to CHASSIS position.
5.) Follow the test conditions described for respective test points shown in Table 10-17. 
6.) Keep a record of the results with other hard copies of PM data kept on site. Figure 10-6 Ground and Chassis Leakage Current Test
Table 10-17 Chassis Leakag e Current Test Condition
TESTCONDITION
1
Mounting screw for probe receptacle
2 Wheel support
3 Mounting screw for CRT housing
4Mounting screw for peripheral plugged into unit
5Mounting screw for other peripheral powered by unit 
						

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
Section 10-7 - Electrical Safety Tests 10-19
10-7-5-4 Data Sheet for Chassis Source Leakage Current
The test passes when all readings measure less than the value shown in Table 10-14. Record all data 
on the PM Inspection Certificate.
10-7-6Isolated Patient Lead (Source) Leakage–Lead to Ground
10-7-6-1 Definition This test measures the current which would flow to ground from any of the isolated ECG leads. The 
meter simulates a patient who is connected to the monitoring equipment and is grounded by touching 
some other grounded surface. Measurements should be made with the ground open and closed, with 
power line polarity normal and reversed, and with the ultrasound console Off and On. For each 
combination the operating controls, such as the lead switch, should be operated to find the worst case 
condition. Table 10-18 Typical Data Sheet for Chassis Source Leakage Current
Unit Power
Tester Polarity Switch
Tester Neutral or Ground SwitchTest 1 Probe 
Connector
Test 2 
WheelTest 3  CRTOptional  Test 4 Optional Test 5
Enter Name of tested peripheral here:
ON NORM OPEN
ON NORM CLOSED
ONREVOPEN
ONREVCLOSED
OFFNORMOPEN
OFF NORM CLOSED
OFF REV OPEN
OFF REVCLOSED
CAUTIONEquipment damage possibility. Never switch the Po larity when the unit is powered ON. Be sure 
to turn the unit power OFF before switching the polarity using the POLARITY switch. Otherwise, 
the unit may be damaged. 
						

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
10-20Section 10-7 - Electrical Safety Tests
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.
 
10-7-6-3 Dale 600 Meter ProcedureThe 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.
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 meters “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. Figure 10-7 Test Circuit for Measuring Non-Isolated 
Patient Leads
CAUTIONLine voltage is applied to the ECG leads duri ng this test. To avoid possible electric shock 
hazard, the system being tested must not be touched by patients, users or anyone while the ISO 
TEST switch is depressed. When the meters ground switch is OPEN, dont touch the unit!
POWER
OUTLET
H   (Black)
N   (White)
G   (Green)Internal
circuitry
Insulating surface
Polarity reversing switch
(use both positions)  Appliance power switch
(use both “off” and “on” positions)
Patient connected leads
The connection is at service entrance
or on the supply side of a separately
derived system
Building
ground
Grounding contact switch (use in both
“open” and “closed” positions) Current meter
H = Hot
N = Neutral (grounded)
G = Grounding conductor
H 
N
G
Patient lead selector switch (if any)
(activated as required)
Appliance
Between each patient 
lead and ground 
						

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
Section 10-7 - Electrical Safety Tests 10-21
10-7-6-3 Dale 600 Meter Procedure (cont’d)
5.) Set the meters “FUNCTION” switch to LEAD TO  GROUND position to measure the patient lead to 
ground leakage current.
6.) Select and test each ECG lead positions (except ALL) of the LEAD selector, testing each to the  power condition combinations. Figure 10-1 ECG Leakage Current Test
Table 10-19  Testing Power Conditions
ECG PowerMeter’s Polarity SwitchMeter’s Neutral Switch
ON NORM CLOSED
ON NORM OPEN
ON REVERSE CLOSED
ONREVERSEOPEN
OFFNORMCLOSED
OFFNORMOPEN
OFF REVERSE CLOSED
OFF REVERSE OPEN
ECG
Patient
Cable 
						

							GE HEALTHCARE
DIRECTION 2286865, REVISION 14LOGIQ™ 7 SERVICE MANUAL
10-22Section 10-7 - Electrical Safety Tests
10-7-6-3 Dale 600 Meter Procedure  (cont’d)
7.) Record the patient lead to ground leakage current measured on the data sheet.
8.) Set the meters “FUNCTION” switch to LEAD TO LEAD position to measure the lead to lead leakage  current.
9.) Select and test each ECG lead positions (except ALL) of the LEAD selector, testing each to the  power condition combinations.
10.) Record the lead to lead leakage current measured on the data sheet.
11.) Set the meters “FUNCTION” switch to LEAD ISO position to measure the patient lead isolation  current.
12.) Select and test each ECG lead positions (except ALL) of the LEAD selector, testing each to the  power condition combinations.
13.) Depress the rocker switch to ISO TEST and read the isolation current. To apply the voltage to the  lead safely, the voltage is only applied when the rocker switch is depressed to ISO TEST.
14.) Record the patient lead isolation current measured on the data sheet.
10-7-7 Isolated Patient Lead (Source) Leakage–Lead to Lead
Reference the procedure in the IEC 60601-1. When using the Dale 600, switch the meter’s function 
selector to the LEAD-LEAD position. Select and test each of the five ECG lead positions (except ALL) 
on the LEAD selector, testing each to the power condition combinations found in the table. Record the 
highest leakage current measured.
10-7-7-1 Dale 600 Patient Lead Tests NEUTRAL POLARITY
1.) Closed Normal
2.) Open Normal
3.) Closed Reversed
4.) Open Reversed
10-7-8 Isolated Patient Lead (Sink) Leakage-Isolation Test
Reference the procedure in the IEC 60601-1. When using the Dale 600, switch the meter’s function 
selector to the LEAD-ISO. Select the ALL position on the lead selector. Depress the rocker switch to 
ISO TEST to test lead isolation.
NOTE: It is not necessary to test each lead individually or power condition combinations as required in  previous tests.
CAUTIONLine voltage is applied to the ECG leads during this test. To avoid possible electric shock 
hazard, the system being tested must not be touched by patients, users or anyone while the ISO 
TEST switch is depressed.