M2540-92000-01 A M2540 Ultrasound System Field Service Manual Page 90
Performance Tests: Electrical Safety Tests
•The ECG Lead Leakage Current test checks ECG leads connected to the optional Physio
module for electrical leakage. See “ECG Lead Leakage Current Test (Source)” on page94.
•The ECG Lead Isolation Leakage test checks ECG leads by applying voltage from the mains to
the leads, to assure that the system is isolated from such voltages. See “ECG Lead Isolation
Leakage Current Test” on page96.
•The Transducer Leakage Current test checks a transducer for electrical leakage while it is
connected to the ultrasound system. The system sends normal operating voltages to the
transducer, which is tested for leakage. See “Transducer Leakage Current Test Procedure”
on page 100.
•The Transducer Isolation Leakage Current test checks a transducer for electrical leakage by
applying mains voltage to the leads, and checking the transducer for leakage. See “Transducer
Isolation Leakage Current Test” on page102
All tests can be performed using commercially available safety analyzer test equipment. Basic
measurements can be performed with multifunction instruments like the HP 3469A multimeter.
NOTE These procedures require a safety analyzer. Routinely use a safety analyzer as a final
step in any repair or upgrade, to maintain agency approved status. The safety analyzer is
also useful in detecting abnormalities of line voltage, grounding, and total current loads.
Follow the instructions of the analyzer manufacturer.
The limits referenced in these tests are prescribed by UL, CSA, and IEC. Local regulations may
require additional tests.
Chassis to Ground Resistance Test
This test checks the entire system for electrical resistance between the chassis and ground.
Figure 6-1 on page 91 shows the basic electrical concept of the ground resistance test. Use a
safety analyzer and complete the procedure that follows the figure.