4535 612 10261 HD11 Service Manual Page 152
CSIP Level 1 Performance Tests: Electrical Safety Tests
3. Turn on the ultrasound system by starting its internal PC.
4. Connect ECG leads to the ultrasound system, but do not connect the ECG leads to the ana-
lyzer yet.
5. In normal polarity, perform a lead isolation test. Record the reading in microamperes. This
reading is the correction factor used in step 7.
6. Connect all ECG leads to the appropriate jacks on the analyzer and perform a lead isolation
test. Record the reading in microamperes.
7. Subtract the step 5 correction factor from the step 6 reading to get an accurate isolation
leakage measurement. Record this value. Check that the value is within the limit specified in
Figure 6-4 on page 151.
NOTE Some analyzers do not require subtracting the correction factor from the lead isolation
reading. For more information, see the analyzer’s documentation.
Tr a ns d uc e r
Te s t s
This section describes two electrical leakage current tests for transducers. To ensure patient
safety, it is very important to verify the integrity of the insulating layers of all transducers.
When you perform the safety tests, use saline solution in a container as a conductive medium.
The solution penetrates any cracks or holes in the transducer insulation and provides an electri-
cal path between the submerged lead wire and the inner transducer shield.
NOTE Before proceeding with any transducer test, thoroughly inspect the transducer. If the
transducer is a TEE, check that its steering controls are working properly.
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