Test & Measurement
temporary loss of function but allows for operator intervention to recover the device to normal operation, for example by cycling the power of the device. Permanent loss of function will be a failure.
Test plan
Manufacturers can minimise the costs and time associated with EMC testing by proper preparation for test. A test laboratory sees many thousands of products each year – they will not be familiar with your product, so you must brief them fully. A successful testing programme is the result of you disclosing as much information to your chosen EMC test laboratory about the equipment under test (EUT) as early as possible in the project cycle, with a special focus on: Block diagrams of the test confi gurations and details of any support equipment to exercise or monitor the EUT
Mode of operation for emissions testing to maximise potential interference and highest internal operating frequencies
Mode of operation for immunity to exercise critical functions and method of monitoring to determine if function is upset or degraded
Power supply requirements List of signal interface ports, type and cable lengths
Test requirements and rationale (any tailored requirements)
Susceptibility performance criteria and method of monitoring – parameters to be monitored, failure criteria
Sweep speed, dwell time and susceptibility modulations
Grounding arrangement
This information will help the laboratory to develop a realistic test plan, enabling you to more accurately anticipate time and costs for testing.
The test plan provides all the information to enable a test facility to perform the tests. Generally, there is one test plan per equipment/system. The test report is produced by the test facility as a record of the tests carried out. This demonstrates how the equipment complies with the test standard against the requirements of the
control plan/test plan, and hence contractual requirements.
The generic content of a test plan should include:
Description of equipment under test – power supply, interfaces, cable lengths, size and weight
Modes of operation – exercise all functions for emission and susceptibility
Test confi guration and layout – block diagram and layout on the bench/fl oor, grounding arrangement
Drive and support equipment
Test procedures and limits QA, documentation, safety & security EMC is an issue that many designers and manufacturers fi nd complex and confusing, but that does not mean that they can ignore their legal obligation to ensure compliance. Neither should those manufacturers integrating components into their fi nal product plead ignorance, making the assumption that their supplier is doing the right thing. Consideration of EMC at the earliest stage in the design process will help manufacturers to minimise test failures and the time and cost for reworking their design and retesting. A product lifecycle review will also highlight any design measures required to maintain a product’s compliance. This will help manufacturers increase the return-on- investment that they get from their EMC testing, help to ensure that the EMC integrity of products lasts a lifetime and enhance a brand’s reputation for product reliability.
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Want to be part of the action? Then contact: Tony Patman | 01622 687031 |
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jtait@cieonline.co.uk Components in Electronics October 2025 35
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