4535 612 10261 HD11 Service Manual Page 146
CSIP Level 1 Performance Tests: Electrical Safety Tests
6. Record the highest resistance value measured in step 5. Check that the highest resistance
value is within the limit specified in Figure 6-1 on page 145.
NOTE If the reading exceeds the specified limit, check the power cord and the associated pri-
mary wiring.
A comprehensive ground impedance measurement can be performed using the safety analyzer.
The impedance test drives a load current through the ground wire while measuring the AC volt-
age drop across the entire length of the power cord and to the system chassis. The reading will
be in milliohms.
Ground Wire
Leakage
Current Test
This test checks the entire system for leakage on chassis ground wires. Figure 6-2 on page 147
shows the basic electrical concept of the test. Use a safety analyzer and complete the procedure
that follows the figure.
CAUTION If the safety analyzer is used for an extended period, it may be damaged by the high current draw
of the system.
WARNING This test can be hazardous. Avoid any contact with line voltage. Any time during the test that the
ground connection is open, do not touch the chassis or the patient cable.
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