Read other posts in the "Elephant in the Test Room" series here.It is looking good for using 3D software to diagnose the performance of the radiated emissions test fixture. Should get the go ahead any day now. Meantime, let’s explore this year’s hot topic. The Annual IEEE EMC Show - Why Dresden?It is no surprise that some USA residents in the EMC industry are wondering why the … [Read more...]
Determination of Practical Harmonic Levels
Well we are still waiting to see if borrowing 3D EM software is on the cards. I should know soon, one way or the other. I hope it happens, but for now let’s keep holding off on Elephant #3, ‘Fixing the Broken Automotive Test Fixture,’ In the meantime, we can continue the engineering approach on determining a practical level of harmonics in RF immunity for Elephant #2, … [Read more...]
Elephant in the Test Room #2 Continued and The Design Guide Article
Read other posts in the "Elephant in the Test Room" series here.Elephant #2 - Disharmony in Harmonic LimitsThe Room: RF immunity testingThe Elephant: The curbing of the contribution made by harmonics to a calibrated test-field varies wildly from standard to standard, and within standardsThe Culprit: Harmonic limits that are seemingly not well thought through, and / or are open … [Read more...]
Training the Intern and Elephant in the Test Room #2 Continued
Read other posts in the "Elephant in the Test Room" series here.Elephant #2 - Disharmony in Harmonic LimitsThe Room: RF immunity testingThe Elephant: The curbing of the contribution made by harmonics to a calibrated test-field varies wildly from standard to standard, and within standardsThe Culprit: Harmonic limits that are seemingly not well thought through, and / or are open … [Read more...]
The Linearization of EMC Amplifiers Continued & Introduction to Elephant in the Test Room #2
Read other posts in the "Elephant in the Test Room" series here.As promised in the last post, here is the start of the next elephant! Elephant #2 - Disharmony in Harmonic LimitsThe Room: RF immunity testingThe Elephant: The curbing of the contribution made by harmonics to a calibrated test-field varies wildly from standard to standard, and within standardsThe Culprit: Harmonic … [Read more...]
Elephant in the Test Room #1 Continued – Linearization of EMC Amplifiers
Read other posts in the "Elephant in the Test Room" series here.Recap On this ThreadThe room: MIL-STD RF immunity testing – 1-18GHz 200v/mThe elephant: everyone in the room is aware that a significant fraction of the ‘calibrated’ 200v/m test field is actually created at the wrong test frequency.The culprit: notoriously high ‘start of band’ harmonics produced by all octave band … [Read more...]
The EMC Community Perspective
As indicated in a previous blog post, it seems hard to justify the rationale behind testing medical equipment for RF immunity at 3m distance. It is this greater test distance (as opposed to the 1m test distance accepted in automotive and MIL-STD testing) that is driving the high price of the replacement amplifiers. A change from the current test field strength of 10v/m @ 3m to … [Read more...]
Impact of the Upcoming Medical RF Immunity Revision
As indicated last time, there are two key parties with a vested interest in the outcome of the upcoming Medical RF immunity revision:The test house manager who has to justify an upgrade to his test system to the people holding the purse strings.His customer, the company wishing to sell medical equipment compliant with the revised standard.I shall add a third … [Read more...]
