AMETEK CTS Automotive Transient Immunity Testing
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3. Testing and Precautions
All tests produced EMC generators are immunity tests on electronic equipment or devices. These tests are
potentially dangerous to the operator. It is the responsibility of the user to avoid critical failures and risks to the
environment and the operator.
National and International regulations regarding human safety must be followed.
Individuals with certain health conditions (e.g. with a heart pacemakers or similar devices), should not participate
in testing.
Long power supply lines to the EUT may radiate energy which may interfere with other instruments unrelated to
the generator. It is the responsibility of the user to determine whether to conduct immunity tests in a given area.
Generator and coupling/decoupling voltage power supplies must be grounded and connected to reference plane.
3.1. Standard Testing and Trained Operators
Operators must have read and understood the manufacturer or international standard to be applied.
This document does not replace an intimate understanding of the standard and the DUT which is required for
correct, compliant testing. The equipment is to be used by trained operators only.
3.2. Precautions to be taken
EMC and High Voltage test areas must always be supplied by a decoupled and well-known power supply.
The decoupling can be realized either by
- filtering
- or the use of an isolating transformer
When using isolating transformers, the fault current safety devices normally don’t trip.
EMC and High Voltage test areas must always have a clear grounding strategy. All coupling/decoupling high power
voltages and all LISN’s must be strictly and securely connected to the ground reference plane of the test setup.
Ensure the correct current back flow to the generator. Missing connections can cause extremely high voltages and
may become a health hazard. Therefore, it is absolutely necessary to use ground reference planes which are
connected to a protective ground.
3.3. Failures and Damage
If it is determined that a safe operation of the equipment due to failure or heavy strain is no longer possible, the
supply voltage must be disconnected, and the equipment protected from unintentional use.
Unsafe operation is determined as follows:
• the equipment shows visible damage
• the equipment is not working
• the equipment has experienced severe stress during transport
• the equipment was stored in an unsuitable environment for an extended period of time.
Always exercise good judgement in determining whether a device is unsafe for operation.
3.4. Coupling Networks
• The coupling network has mostly no On / Off switch and no internal fuse for the EUT power supply. This is
caused the different regulation in each country. The device under test must be protected by the user in an
adequate safe solution. As an option special adapters and switches can be built in, but the user must specify
this special solutions.
• Generators and coupling devices must be grounded and connected to the reference ground.
• For coupling pulses to the lines, the coupling path must be setted.
• If a line has not to be coupled, it is necessary to disconnect or switch off this coupling path.
• Special safety adapter cables are part of the delivery.
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