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M2540-92000-01 A M2540 Ultrasound System Field Service Manual Page 96
Performance Tests: Electrical Safety Tests
5. Take ECG lead leakage current measurements with both normal and reverse polarity. Check
that the highest value is within the limit specified for Normal condition in Figure 6-3 on
page 95.
6. Take ECG lead leakage current measurements in open ground condition, with both normal
and reverse polarity. Check that the highest value is within the limit specified for Single Fault
condition in Figure 6-3. Write down the highest value; this is the value for the first single fault
condition.
7. Take ECG lead leakage current measurements in open neutral condition, with both normal
and reverse polarity. Check that the highest value is within the limit specified for Single Fault
condition in Figure 6-3. Write down the highest value; this is the value for the second single
fault condition.
8. Record the highest current value measured in step 6 and step 7. Check that the highest value
is within the limit specified for Single Fault condition in Figure 6-3.
Failure to meet the specified limits may indicate a fault with the isolation of the Physio module.
ECG Lead
Isolation
Leakage
Current Test
This test checks ECG leads by applying voltage from the mains to the ECG leads, to check that
the system is isolated from such voltages. Figure 6-4 on page 97 shows the basic electrical
concept of the ECG Lead Isolation Leakage Current test. Use a safety analyzer and complete the
procedure that follows the figure.