Philips M2540 User Manual download pdf (Page 36)

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.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 219 220

No comments

Philips M2540 User Manual Page 36