GE LOGIQ P6 Service Manual page 470

GE H
EALTHCARE
D 5245279, R
IRECTION EVISION
10-6-9 Probe Leakage Current Test
10-6-9-1 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.
10-6-9-2 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 combination, the probe must be active to find the worst
case condition.
H (BLACK)
N (WHITE)
POWER
OUTLET
G (GREEN)
NOTE: Each probe will have some amount of leakage current, dependent on its design. Small variations in
probe leakage currents are normal from probe to probe. Other variations will result from differences in
line voltage and test lead placement.
10-6-9-3 Meter Procedure Using Probe Adapter
The Dale 600/600E provides a method for testing probes independently from the system. The meter
utilizes a probe adapter to apply a test potential commonly to all connector pins.
The probe's imaging area is immersed in a saline solution along with a grounding probe from the
meter to complete the current path. Saline solution is a mixture of water and salt. The salt adds a free
ion to the water, making it conductive. Normal saline solution is 0.9% salt or 1/2 gram salt per 1 liter of
water. If saline is not available, a mixture of 1 quart water with one or more grams of table salt, mixed
thoroughly, will substitute.
To avoid probe damage and possible electric shock, do not immerse probes into any liquid
CAUTION
beyond the level indicated in the probe users manual. Do not touch the probe, conductive liquid
or any part of the unit under test while the ISO TEST switch is depressed.
Follow these steps to test each transducer for leakage current.
1.) Turn the LOGIQ™ P6 unit OFF.
2.) Plug the unit into the test meter, and the meter into the tested AC wall outlet.
3.) Connect the probe for test with the meter's appropriate adapter.
4.) Plug the saline probe into the meter's "CHASSIS" connector.
5.) Plug the probe adapter into the meter's connector marked "EXTERNAL".
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3
POLARITY REVERSING SWITCH
MOMENTARY
SWITCH
Figure 10-9 Set Up for Probe Leakage Current
Section 10-6 - Electrical Safety Tests
LOGIQ™ P6/P6 P S
RO ERVICE
PROBE
CONSOLE
LEAKAGE TEST
METER
M
ANUAL