@luizcosta, if I'm understanding right, if you just plugged a USB cable through the test enclosure to connect the DUT, the USB cable would act as an antenna, reacting to signals outside the test chamber and altering the test results. The "USB feed-through filter" on that slide is just a part of the test enclosure that gets rid of this external noise and provides a cleaner test environment.
@luizcosta - Bed-of-Nails is a connection technique used to probe a PC Board by using "pins" and pressing the board onto these pins. The term is due to the pins looking like the old torture device by teh same name.
USB - Universal Serial Bus - the same port that is on your computer used for memory sticks (thumb drives)
@bigchin - the audio for the presentations can be listened to again from the "archives" link in the menu above. contact me directly if you want to download your own copy of the audio file to learn how I have dowlnloaded them
in some cases there exist precalibrated golden units, for example there are certified measurement antennas with guarangeed signal shape and power, but these are very expensive and may be unnecessary in production if proper calibration exists,
phase may be important when testing MIMO devices. but there may be a way to isolate and test each of the MIMO radios by itself, which would be more reliable. phase may be difficult to get right, particularly at 6 GHz.
Hello Fanny - (reposted) looking at today's slides, and looking more closely at your octoBox. Is this made from basic material (metals?) or are there proprietary electronic or some other structure that isolates one chamber from the other. Just a breif explanation would be helpful to more fully understand the material you are presenting. Thanks
If you haven't told us yet, please let us know 1) Are you involved with production test? If yes, what radio technology and applications are you working with?, 2) what is your role in production test?, 3) in your production test setup are you using test instruments or a golden master device?, 4) do you have high production yields or is there room for improvement?
@ANN: Are you getting any of our questions? If you are and you don't think they should not be addressed now: I understand you want our feedback, but don't you think that a two way participation will be more active learning?
I'm not sure when to ask this - but I really would like to understand how you make/create a golden unit - this seems like the hard part. And once you made one, and decided it's "gold" how to you ever make another that is identical?...
If you haven't told us yet, please let us know 1) Are you involved with production test? If yes, what radio technology and applications are you working with?, 2) what is your role in production test?, 3) in your production test setup are you using test instruments or a golden master device?
For applications the have RF connection that go to an external antenna, could the master and the DUT be connected through a cabled connection with an characterized attenuator between them to remove variances in the antenna to air interface?
A tombstone cap is a SMT solder defect where the surface tension of the solder on one of the solder pads causes the part to pivot up off the other pad and stand up straight like a tombstone. Happens more often with smaller parts.
Hello Fanny - looking at today's slides, and looking more closely at your octoBox. Is this made from basic material (metals?) or are there proprietary electronic or some other structure that isolates one chamber from the other. Just a breif explanation would be helpful to more fully understand the material you are presenting. Thanks
Sustaining Engineering Project Leader, the company designs and manufactures Guided Wave RADAR liquid level gauges for the tank truck industry. Wireless applications are Bluetooth now, future may be WiFi.
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In many engineering workplaces, thereís a generational conflict between recent engineering graduates and older, more experienced engineers. However, a recent study published in the psychology journal Cognition suggests that both may have something to learn from another group: 4 year olds.
Conventional wisdom holds that MIT, Cal Tech, and Stanford are three of the countryís best undergraduate engineering schools. Unfortunately, when conventional wisdom visits the topic of best engineering schools, it too often leaves out some of the most distinguished programs that donít happen to offer PhD-level degrees.
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