GE Vivid 7 Service Manual

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 10 - Care & Maintenance 10 - 13
10-7-2GEHC Leakage Current Limits
The following limits are summarized for NFPA 99/UL2601-1/UL60601-1 (for USA) and IEC 60601-1 
Medical Equipment Safety Standards. These limits  are GEHC 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 am ount of current that will pass (or sink ) to ground if a patient contacted 
mains voltage.
The following tests are performed at the factory and sh ould 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 el ectrical safety analyzer.
Table 10-12   Chassis Leakage Curre
nt Limits—Accessible Metal Surfaces
CountryNormal ConditionOpen GroundReverse PolarityOpen Neutral
USAN/A
0.3 mA 0.3 mA N/A
Other 0.1 mA
0.5 mA 0.5 mA 0.5 mA
Table 10-13   Type BF  Patient Leakage Limits  - Non-Conductive (Floating) Surface and Cavity 
Probes
Country
Normal 
Condition
Open GroundReverse PolarityOpen Neutral*Mains Applied
USA 0.1 mA
0.5 mA 0.5 mA 0.5 mA 5.0 mA
Other 0.1 mA
0.5 mA 0.5 mA 0.5 mA 5.0 mA
Table 10-14   Type CF  Patient Leakage 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 0.05 mA
Other 0.01 mA
0.05 mA 0.05 mA 0.05 mA 0.05 mA 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
10 - 14 Section 10-6 - Using a Phantom
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.
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.
10-7-4 Grounding Continuity  
Measure the resistance from the thir d 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 proc edure in the IEC 601-1.1.
Figure 10-1   Typical Alternate Outlet Tester
CAUTIONElectric Shock Hazard. The patient must not be contacted to the equipment during this test
Figure 10-2   Ground Continuity Test 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 10 - Care & Maintenance 10 - 15
10-7-4-1 Meter Procedure Follow these steps to test the ground wire resistance.
1.) Turn the Vivid 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 in to the meters “CHASSIS” connecto r and attach the black chassis 
cable clamp to an exposed metal part of the Vivid 7 unit.
4.) Set the meters “FUNCTION” swit ch to the RESISTANCE position.
5.) Set the meters “POLARITY” swit ch to the OFF (center) position.
6.) Measure and record the ground wire resistance. 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
10 - 16 Section 10-6 - Using a Phantom
10-7-5 Chassis Leakage Current Test
10-7-5-1 Definition This test measures the current t hat would flow in a grounded person who touched accessible metal 
parts of the bedside station if the ground wire shoul d 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 wi th 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. Meas urements 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 instru ment, its power plug may be inserted into the wall 
outlet and the equipment under test is plugged into t he receptacle on the panel of the meter. This places 
the meter in the  grounding conductor and the cu rrent 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 
10-12 Chassis Leakage Current Limits—Acc essible Metal Surfaces on page 10-13.
7.) Follow the test conditio ns described for respective test points shown in Table 10-15 Chassis 
Leakage Current Test Condition on page 10-17 .
CAUTIONElectric Shock Hazard. When the meters ground switch is OPEN, dont touch the unit!
CAUTIONEquipment damage possibility. Never 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 10-3   Set Up for Chassis Source Leakage Current, IEC 601-1 Clause 19 - Continuos Leakage Currents  and Patient, Auxiliary Currents 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 10 - Care & Maintenance 10 - 17
10-7-5-2      Generic Procedure (cont’d)
.
8.) Keep a record of the results with other  hard copies of PM data kept on site.
10-7-5-3 Data Sheet for Chassis Source Leakage Current The test passes when all readings measure less than the value shown in  Table 10-12. 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 wit h 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 10-15   Chassis Leakage 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
Table 10-16   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 REV CLOSED
CAUTIONEquipment damage possibility. Never switch the Polarity 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 FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
10 - 18 Section 10-6 - Using a Phantom
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.
 
10-7-7 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 cond ition combinations found in the table. Record the 
highest leakage current measured. Figure 10-4   Test Circuit for Measuring Non-Isolated Patient Leads
Table 10-17    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
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 FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 10 - Care & Maintenance 10 - 19
10-7-8 Isolated Patient Lead (S ink) 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 individua lly or power condition combinations as required in 
previous tests.
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. 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
10 - 20 Section 10-6 - Using a Phantom
10-7-8-1 Data Sheet for ECG Leakage Current The test passes when all readings measure less than the value shown in the table below. Record all 
data on the PM Inspection Certificate.
Table 10-18   Maximum Allowance Limit for ECG Leakage Current
AC Power Source
Maximum
Allowance Limit
GROUND OPEN
GROUND  CLOSED
Patient Lead to Ground Leakage Current Test
and
Patient Lead to Lead Leakage Current Test 115V 10uA 10uA
220/240V 500uA 10uA
Table 10-19   Maximum Allowance Limit for ECG Leakage Current
AC Power  SourceMaximum
Allowance Limit
Patient Lead Isolation Current Test 115V 20uA
220/240V 5mA
Table 10-20   Typical Data Sheet for ECG Leakage Current
ECG 
Power
Tester 
Polarity  SwitchTester 
Ground  SwitchTester Lead Selector
RLRALALLC
ON NORM CLOSED
ON REVERSE CLOSED
ON NORM OPEN
ONREVERSEOPEN
OFFNORMCLOSED
OFFREVERSECLOSED
OFF NORM OPEN
OFF REVERSE OPEN 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 10 - Care & Maintenance 10 - 21
10-7-9 Probe Leakage Current Test
10-7-9-1 Definition This test measures the current that would flow to  ground from any of the probes through a patient who 
is being scanned and becomes grounded by  touching some other grounded surface.
10-7-9-2 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 combin ation, the probe must be active to find the worst 
case condition.
NOTE: Each probe will have some amount  of leakage current, dependent on its design.  Small variations in 
probe leakage curren ts are normal from probe to  probe. Other variations will  result from differences in 
line voltage and test lead placement. Figure 10-5   Set Up for Probe Leakage Current
POWER
OUTLETH   (BLACK)
POLARITY REVERSING SWITCH
MOMENTARY
SWITCH
N   (WHITE)
G   (GREEN)LEAKAGE TEST
METER
CONSOLE
PROBE 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
10 - 22 Section 10-6 - Using a Phantom
10-7-9-3 No Meter Probe Adapter Procedure Follow these steps to test each transducer for leakage current.
1.) Turn the Vivid 7 unit OFF.
2.) Plug the unit into the test meter, and  the meter into the tested AC wall outlet.
3.) Plug the external probe into the meters “EXTERNAL” connector.
4.) Set the meters “FUNCTION”  switch to EXTERNAL position.
5.) Connect the probe for test with the connector of the console.
6.) Add the saline probe and the imaging area of the probe into the saline bath.
7.) Have unit power ON for the first par t; turn it OFF for the second half.
8.) Depress the ISO TEST rocker switch and record the highest current reading.
9.) Follow the test co nditions described in Table 10-21 Typical Data Sheet For Transducer Source 
Leakage Current on page 10-23  for every transducer.
10.) Keep a record of the results with other hand copies of PM data. Figure 10-6   No Meter Probe Adapter Procedure