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I found a HP8330A meter plus 8334A detector and they seem to be OK, apart from noisy readings on CAL and measure.
Searching the web for a user / service manual has so far been a dead end, apart from an article in HP Journal 1971-07.
Even a mere circuit diagram would be very helpful. It boils down to a chopped DC nanovoltmeter, but it would be nice to get
it working properly because of the broad wavelength response and direct readout. Cheers, Hans

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