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Lena/Oct 2016: Difference between revisions
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→Design problems
ElenaZhivun (talk | contribs) |
ElenaZhivun (talk | contribs) |
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The photodiodes cable has shielding, which works much better when it's connected to the amplifier's ground. When the shielding is connected to the ground, the 150kHz component amplitude drops by an additional factor of 5. The next review of the board will have grounded pins in the photodiode header to connect the cable shielding.
Low-frequency gain of the differential polarimeter seems to be larger than the of SR570. It's unclear if it's a feature or a bug or a poor connection.
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