The HP jumper, also known as WTF?
The HP jumper, also known as WTF?
HP3455A teardown – part 2 – The Logic! and the Display
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- HP3455A teardown – part 1 – calibration module and the backside
- HP3455A teardown – part 2 – The Logic! and the Display
- HP3455A teardown – part 3 – The analog part and the miscellany
- HP 3476B teardown
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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.