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M2540-92000-01 A M2540 Ultrasound System Field Service Manual Page 36
Safety: Restrictions for Use
Restrictions
for Use
The M2540A ultrasound system is subject to certain restrictions that are described in the
following sections.
Immunity Level
Test Results
The EMC standards require that manufacturers of patient-coupled equipment specify
electrostatic discharge immunity levels for their systems. This type of device is designed to
receive and amplify low-level signals in the same bandwidth as the interference to which it is
susceptible.
Immunity is defined in the standard as the ability of a system to perform without degradation in
the presence of an electromagnetic disturbance. Degradation in image quality is a qualitative
assessment that can be subjective. The simplest way to assess degradation is to note when the
first sign of an artifact is seen. This method has two advantages: It removes the issue of subjective
decision-making and provides the most stringent test results.
Caution should therefore be taken in comparing immunity levels of different ultrasound systems.
The criteria used for measuring degradation are not specified by the standard, and can vary with
the manufacturer.
Philips has tested each class of transducer for every operating mode over a wide range of
frequencies. This testing showed PW Doppler to be the most susceptible to radio-frequency
interference.
Please see the Philips Safety and Standards Guide shipped with your system for additional
information about compliance with EMC standards.
Electrostatic
Discharge
Electrostatic discharges can cause the ECG heart rate display to increase by 10 to 15% for a few
seconds after the discharge. However, the ECG heart rate display returns to normal within four
seconds.