USB-SD-Mux: EMC Testing
Today Jonas and I went to our EMC testing lab to continue the measurements needed to certify electromagnetic compatibility for the USB-SD-Mux.
To make it short: It has passed the radiation tests. In the end we found out that it wasn't the USB-SD-Mux itself that caused us a lot of headache. We are now quite confident that most radiation was caused by the system we used to stimulate the USB-SD-Mux. In the end we had the stimulation-box (containing a Beagle Bone Black) hidden behind multiple absorber-panels beneath the measurement table. This way we were able to dampen enough noise to pass tests. It seems for our next measurements we need to find something other than a Beagle Bone Black for that.
This brings us a lot closer to finally bring the USB-SD-Mux to you. But testing is not completely done: Next step is to pass the RF-immunity tests. We keep our fingers crossed!
Wideband antennae in the measurement chamber. It's surprisingly dark in there.
This box contains the Beagle Bone Black we used to stimulate our devices under test. Hidden behind a lot of absorbers we were finally able to suppress most of it's noise.
The USB-SD-Mux has evolved since our last blog post. During the test we used one USB-SD-Mux as a card reader and the other as a multiplexer. This way we have control about the card reader and can test both modes in one measurement.
Further Readings
Yes we CAN... add new features
Have you ever experienced an otherwise fine product that is missing just the one feature you need for your application?
Pengutronix at Embedded World 2022
Welcome to our booth at the Embedded World 2022 in Nürnberg!
First Steps using the candleLight
So you went and got yourself one of our fancy rocket-penguin branded CandleLight dongles or, being the die hard hacker you are, went and soldered one up in your toaster oven labeled "not food safe". What's next then? How do you use this thing? Let's answer these question by grabbing a Raspberry Pi and exploring some of the possibilities.
labgrid Tutorials
This week, we started our series of YouTube labgrid tutorials. In the next few weeks we will publish more video tutorials showing you labgrid's features and giving you handy tips and tricks.
Showcase: Remote Working
Project work with our customers includes the handling of hardware prototypes. Since work is generally done in parallel, on many project for many customers, there is a constant flood of hardware prototypes accumulating on the desks of our developers. These accumulations of loose boards can become a problem. This is especially the case when a number of people work on a prototype. Another common annoyance occurs when a project has not been worked on for a period of time, as this might involve moving the hardware from one desk (or storage location) to another and setting it up again. Right now, in a situation where working from home is more common and relevant than ever, this has become even more of an issue. The distances between desks and storage locations of our developers are now measured in kilometers, rather than meters.
Pengutronix at FrOSCon 2018
This year, a team from Pengutronix attended FrOSCon in St. Augustin for the first time. We took the opportunity to shake hands, talk about our latest developments and meet hackers interested in working with embedded Linux.