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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
On an analog 'scope, that knob is likely for fine adjustment of the vertical sensitivity. The calibrated position would be for the knob fully clockwise. Turning the knob counter-clockwise will reduce the gain (and make the gain uncalibrated, i.e. the vertical scale will not correspond to the large knob reading).
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