Description
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1 Piece
Description: Lockable precise setting rotary knob and etched dial.
PRINCIPLES OF OPERATION
The inner scale of the Model 21 Multidial is graduated in hundredths of a turn. The outer scale (read through the viewing window)
counts the number of turns (0 to 15) that have been completed.
Example: If the numeral in the window reads 7 and the inner scale reads 21, the reading is 7 turns plus 21/100 of the eighth turn.
Each complete revolution of the inner scale transfers the outer scale numerals in the window. Numeral transfer on the outer
scale occurs between 94 and 0 on the inner scale.
MOUNTING INSTRUCTIONS
The following instructions apply when the Model 21 Multidial is used on a 1/8″ panel in conjunction with Spectrol 800 series
potentiometers. It may be necessary to modify these instructions when using the Model 21 Multidial with other than 1/8″ panel
thicknesses or multiturn devices having different mounting and/or shaft dimensions:
1. Turn the shaft of the potentiometer against its counterclockwise stop.
2. Turn the inner scale of the Model 21 Multidial so that “0” appears in the viewing window and the inner scale reads higher
than 10.
3. With the braking lever released (in the counterclockwise position) slip the Model 21 Multidial over the potentiometer shaft.
The locating lug on the multidial should enter the potentiometer locating lug hole in the panel.
4. Seat the Model 21 Multidial lightly against the panel.
5. Turn the inner scale counterclockwise slowly until “0” of the inner scale is opposite the index mark. Then tighten the
recessed set screw firmly against the potentiometer shaft.
6. The dial is now ready to operate.
Special Note
• The locating lug on the Model 21 Multidial is designed to occupy the same panel hole that accommodates the potentiometer locating lug.
In instances where cabinet panels are less than 1/8″ in thickness, it may be necessary to file or grind off part of the locating lug of either the
Model 21 Multidial or the potentiometer. In instances where the Model 21 Multidial is used with other than Spectrol 800 series
potentiometers, it may be necessary to drill a 1/8″ hole 0.562″ directly below the horizontal centerline of potentiometer mounting hole to
accent the locating lug.
- Material: Aluminium, brass and plastic
- Colour: Black knob base black scale etched into the aluminium bezel
- Digital control: Inner scale 0 to 99 outer window 0 to 15
- Outer diameter: 46mm
- Height: 25mm
- Diameter: Shaft 6.35mm or slightly less
- Fixing: Side adjust Allen Key grub screw Allen Key included
- Used for precise tuning or adjustment
- Primarily intended for use with Spectrol precision multi-turn wirewound potentiometers
- Complete Turns: 15
- Rotational torque: 50 ~ 500gf.cm
These are a good quality precise adjustment knob comfortable to use and well made, capable of fine adjustment, the inner scale has 0 to 99 positions, as the knob turns through the 100th the outer window automatically moves from 0 to 1. Once the desired position is found the sliding lock can be engaged to secure the knob and scale in that position.
The indicator scale on these superb quality knobs is etched into the aluminium and then coloured black.
For datasheet search…Spectrol Multidial Model 21
Or go directly to…
https://www.vishay.com/docs/57088/model21.pdf
Or
https://www.vishay.com/docs/57110/mo21leaf.pdf
PLEASE NOTE!
These parts came to us as part of a lot of surplus stock from a large distribution Co. and have been kept in storage for a time, they are however pristine, stored with us still in their original packaging and ‘as new’ in all respects, the photographs are representative of their excellent condition, and, as with all our products they come with a full guarantee.
If you have similar items to this, or indeed any electronic components that are surplus to requirements please contact us with details.
