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There are human-readable numbers on the disk at each rotational position. | There are human-readable numbers on the disk at each rotational position. | ||
These number are visible outside of the enclosure. | These number are visible outside of the enclosure. | ||
==Motorized TIME/DIV== | |||
The TIME/DIV control is two concentric knobs. | |||
===Outer Knob=== | |||
The outer knob is the coarse TIME/DIV control, | |||
and goes in 1-2-5 steps from 2 sec/div to 1 μs/div. | |||
The front panel knob rotates this rotary switch. | |||
However, the switch can also be controlled by a motor in the plug-in. | |||
When the coarse TIME/DIV control is rotated using the front panel knob, | |||
the motor's gear is mechanically disengaged from the rotary switch shaft. | |||
The rotary coarse TIME/DIV switch controls the rightmost nixie tube, | |||
which shows the TIME/DIV units. | |||
===Inner Knob=== | |||
The inner knob is probably a vernier TIME/DIV control. | |||
The inner knob rotates the optical disk and a precision rotary potentiometer. | |||
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. | |||
Each light pipe goes to a photosensor, which controls the left three decimal nixie tube. | |||
The inner knob, like the outer knob, can be rotated by turning the front-panel knob, | |||
but is also motor-controlled, presumably to enable automated measurement. | |||
<gallery> | <gallery> | ||