GE LOGIQ S7 Expert, Technical Publication

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Care and Maintenance
4-36
Ultrasound System
–
Common Service Information
Direction 5444964-100 English Rev. 5
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 probe
RF drive.
Measurements should be made under the test conditions
specified in:
• Table 4-6 on page 4-20 , or
• Table 4-7 on page 4-21 , as applicable for every probe.
For each combination, the probe must be active to find the worst
case condition.
Record all data and keep the record of the results with other
hard copies of maintenance data.
NOTE: Saline water pod should be insulated from floor and earth
ground.
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 4-4. Set up for probe leakage current
1. Ultrasound System
2. Electrical Safety Analyzer
3. Neutral Switch
4. Ground Switch
5. Polarity Reversing Switch
6. Meter
7. Isolator
8. Ultrasound
Probe
9. Saline Probe
2
3
6
5
8
7
9
1
4
A