HP3455A teardown – part 1 – calibration module and the backside

Calibration module PCB – top

Calibration module PCB – top

An ASIC (or rebranded standard something), high precision resistors, a LM399 (my guess – it’s rebranded, but apparently that’s the norm for this kind of device…) and the high impedance standoffs for the resistors. The board itself is seriously gilded.

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