From Design and Development of Medical Electronic Instrumentation
Susceptibility to Conducted Electromagnetic Interference
EMI susceptibility tests for medical devices conducted according to IEC-61000-4-6
involve injecting RF voltages onto the power line and bulk RF currents into other signal
cables. A current probe is clamped around the entire cable bundle, and radio-frequency
|Warning! This is a dangerous device! It produces high voltages that can cause very painful or lethal electrical shocks. In operation, the spark gap produces significant levels of ultraviolet radiation, which must be shielded to prevent eye damage. In addition, spark discharges can ignite flammable or volatile atmospheres. Finally, the EMI levels generated by this circuit are certainly above what the FCC likes to see dumped into the atmosphere. Thus, this generator should only be operated inside a properly shielded room.|
energy is injected. The frequency range for immunity tests is 150 kHz to 80 MHz, and the
injected RF has an amplitude of 3 V. Figure 4.26 shows a typical test setup. The device
under test is placed in the approximate center and 10 cm above a reference ground plane,
and is powered and operated in a normal configuration. Injection of RF into the ac power
leads is performed with the coupling network shown in Figure 4.27. Testing of signal input
leads is performed via a current clamp on the leads.
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Topics of Interest
Susceptibility to Fast Power Line Transients IEC-61000-4-4 deals with the immunity that devices must present against repetitive fast transients that may be induced, for example, by inductive...
Susceptibility to High-Energy Power Line Transients IEC-61000-4-5 deals with large surges that may directly reach the device’s power line because of lightning. The surge pulses for this test...
10.1 Introduction 10.1.1 Transient Types Over the last 20 years traditional EMC testing has concentrated on radiated and conducted emission and susceptibility testing. This is carried out by...
Differential signaling is the primary choice for a low power RF interconnection because it provides superior immunity to noise by offering twice the signal swing for a given supply voltage. The out of...
Electromagnetic Interference in Medical Devices An overview of EMI issues can help develop suitable electromagnetic compatibility requirements and other solutions to minimize risk to patients.