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===Inner Knob=== | ===Inner Knob=== | ||
The inner knob is probably a vernier TIME/DIV control. | The inner knob is probably a vernier TIME/DIV control. | ||
The inner knob rotates the optical disk and a precision rotary potentiometer. | The inner knob rotates the optical disk and a precision rotary potentiometer, Tektronix part number [[311-0537-01]]. | ||
Each radial position of the disk produces a pattern of light/dark in the light pipes coming out of the disk. | Each radial position of the disk produces a pattern of light/dark in the light pipes coming out of the disk. | ||
The patterns encode vernier TIME/DIV values. | The patterns encode vernier TIME/DIV values. | ||