← HP3455A teardown – part 2 – The Logic! and the Display
The HP jumper, also known as WTF?
Hm, this looks designed to be operated by a human, without any tools (like a soldering iron), and probably cheaper than a switch.
I suspect something like a memory protect line for calibration (or something similar) perhaps?
Well, it’s quite possible 🙂 I’m just not sure when the thing that we today call a jumper came into standard use. If it was after the meter was made, then this jumper is not that much of a WTF, but if it came before that it’s a mystery why they would use this.
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