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adinsen: Old line caps from my HP 3478A
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adinsen: My HP3478A predates the opto-coupler redesign
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adinsen: HP3478A: Original 3V lithium battery impressively still at 3.5V after 35+ years
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adinsen: HP3478A battery date code 87-11
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adinsen: HP 3478A: Replaced line caps (original spec)
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adinsen: HP 3478A: Replaced line caps (original spec)
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adinsen: HP 3478A: AR488 interface. The 3478A now has Arduino-outside
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adinsen: HP 3478A