Took a punt on this reference attenuator on ebay, to go with some cheap power sensors I got recently, but it seems just a *little bit* out of spec. The seller was nice about it, so it's teardown time once the refund clears!pic.twitter.com/VeG6LL8isY
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I managed to carefully press the PCB out of its housing. Now we can see what's going on properly! It looks like a Pi-attenuator, with a neat grid structure to allow for trimming resistor values after construction.pic.twitter.com/T2sf6G5D4w
and.. there's the problem - some of the traces are completely blown out. Someone put way too much power into this at some point
pic.twitter.com/2bdoIlBPEV
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