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Tutorial, Teardown & Experiments with Stanford Research SR530 Lock-in Amplifier
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Ice-Tea:
Got one of these but by the looks of it the LCD is all over the shop (analog meter seems fine). If anyone is looking for a project to outdo The Signal Path: feel free to drop me a PM ;-)
wishboneash:

--- Quote from: _Wim_ on August 30, 2022, 06:56:38 pm ---
--- Quote from: wishboneash on August 28, 2022, 10:57:19 pm ---Unfortunately page 82 which contained the input section was not in good shape. Some reverse engineering is in order  :)
The rest of the schematics are good. Thanks.

--- End quote ---

I does seem that once upon a time these were delivered together with the unit in a printed format. Did you already ask SRS for a copy? I had good luck with Signal Recovery (Ametek) in the past

--- End quote ---

I contacted SRS and they suggested to buy hard copy from outside vendors for about $100.
maxwell3e10:
I couldn't find a printed SR530 manual, but found SR830. Here is the page with the input amplifier. Perhaps it is similar enough.
Kleinstein:
The SR830 input stage is more conventional. The current to voltage converter uses just a single OP-amp.
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