Probe Leakage Current Test - GE LOGIQ E9 Service Manual

GE
D 5573152-100, R
IRECTION
10-7-10

Probe leakage current test

DO NOT USE THE PROBE IF THE INSULATING MATERIAL HAS BEEN PUNCTURED OR
DANGER
OTHERWISE COMPROMISED. INTEGRITY OF THE INSULATION MATERIAL AND PATIENT
SAFETY CAN BE VERIFIED BY SAFETY TESTING ACCORDING TO IEC60601-1.
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.
NOTE: Some leakage current is expected on each probe, depending 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. It is abnormal if no leakage current is measured. If no leakage
current is detected, check the configuration of the test equipment.
10-7-10-1 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 10-14
•
Table 10-10 on page 10-14
For each combination, the probe must be active to find the worst case condition.
1. Ultrasound System
2. Tester
3. Neutral Switch
. 2
EV
as applicable.
Figure 10-4 Set Up for Probe Leakage Current
2
1
5
3
4
6
A
4. Ground Switch
5. Polarity Reversing Switch
6. Meter
Chapter 10 Care & Maintenance
LOGIQ E9 S
9
8
7
7. Isolator
8. Ultrasound Probe
9. Saline Probe
M
ERVICE ANUAL
10 - 25