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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