GE Vivid E9, Service Manual

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GE H
EALTHCARE
D
IRECTION
GA091568, R
EVISION
5 VIVID E9 S
ERVICE
M
ANUAL
10 - 30 Section 10-6 - Electrical Safety Tests
10-6-8-2 Generic procedure on probe leakage current
The most common method of measuring probe leakage is to partly immerse the probe into a saline bath
while the probe is connected to the ultrasound system and active. This method measures the actual
leakage current resulting from the transducer RF drive.
Measurements should be made under the test conditions specified in:
• Table 10-9 on page 10-22 ,
or:
• Table 10-10 on page 10-22 ,
as applicable.
For each combination, the probe must be active to find the worst case condition.
NOTE: Follow manufacturer’s recommendations for handling saline solution. Refer to their Material Safety Data
Sheet (MSDS) for more information.
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.
The ultrasound probe’s imaging area is immersed in the Saline solution along with a grounding probe
from the test meter to complete the current path.
NOTE: The Saline solution is a mixture of water and salt. The salt adds free ions to the water, making
it conductive. Normal saline solution is 0.9% salt and 99.1% water. If ready-mixed saline
solution is not available, a mixture of 1 quart or 1 liter water with 9 or more grams of table salt,
mixed thoroughly, will substitute.
Figure 10-6 Set Up for Probe Leakage Current
DANGER
TO AVOID PROBE DAMAGE AND POSSIBLE ELECTRIC SHOCK, DO NOT
IMMERSE PROBES INTO ANY LIQUID 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 DOING THE TEST.
SALINE