![]() External power supplies are notorious for causing false emission failures especially if they are switching supplies rather than linear ones. I could go on and on but I'll just add one piece of wisdom that perhaps you can use as a conversation piece to prove you've done your homework: always be very suspicious of your power sources if you're measuring emissions that exceed the limit. Different frequency range, limits, bandwidths, etc. RE102 is likewise very similar to the CISPR 25 RE test. ![]() 461 has a LISN schematic and explanation of its purpose - just know that automotive CE tests will want a 5uH LISN instead of the 50uH one in 461. Measurements are made on the power lines though a network called a line impedance stabilization network or LISN. MIL-STD-461G has very similar tests though.ĬE102 is a lot like the CISPR 25 CE test. You're welcome! Most automotive EMI specifications will often point to CISPR 25 for emissions tests which is not freely available. None of the questions were EMC specific just RF/ basic electronics. I also had to show I knew how to read oscilloscope plots and spectrum analyzer plots. The appendix is great as well as it will go into great detail on every regular section entry in the standard to help with understanding.Įdit: my own interview for EMC testing involved a written test that had questions showing a knowledge of basic electronics, math, and logarithmic math such with dB, dBuV, dBm, etc ("prove that 107 dBuV = 0 dBm in a 50 ohm system"). So they all have the name RE, RS, CE, or CS. Tests in that standard are categorized by whether they are onducted or adiated and an mission test or a usceptibility test. The standard is structured with general test setup/conditions and then all of the individual test methods. Even if you won't be doing military work, all EMC tests are pretty similar. ![]() I recommend perusing MIL-STD-461G which is freely available online. Hiring for an EMC position is extremely hard so the fact that you have RF experience and an interest in the subject is huge. If it's for an internship I can't imagine it'll be too intense.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |