Philips epiq 7, User Manual

Page: 197 / 318

• 10 µA RMS (normal condition)
• 50 µA RMS (single fault condition)
Testing Intraoperative Transducer Leakage Current (Sink)
WARNING
There is considerable hazard in performing this test. Use precautionary measures to avoid
accidental contact with line voltage. In addition, any time that the ground connection has
been opened, do not touch the chassis or the patient cable during the test.
This test checks leakage current with mains voltage applied. For a diagram of this test, Test 2,
see
“Leakage Current Testing for Intraoperative Transducers” on page 193 .
1. Plug the safety analyzer into the power source.
2. Plug the ultrasound system into the safety analyzer.
3. Connect the transducer being tested to the ultrasound system.
4. Immerse 5 cm (2 in) of the transducer in saline solution.
5. Set the safety analyzer Mode switch to the ECG position.
6. Set the safety analyzer Leads switch to the Isolation Test position.
7. Connect a lead to any ECG terminal on the safety analyzer. Leave the other end of the lead
disconnected for now.
8. Press and hold the Isolation Test button and note the leakage reading. This is the correction
factor that will be subtracted from the final reading.
9. Immerse the other end of the lead into the saline solution.
10. Press and hold the Isolation Test button and take the leakage reading again.
11. Subtract the correction factor found in step 8 to get the accurate leakage measurement.
The leakage must be less than 50 µA RMS.
Leakage Current Testing for Intraoperative Transducers Intraoperative Transducers
EPIQ 7 User Manual 4535 617 25341 197