X381: Difference between revisions

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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.


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