HISTORY:
Sustainability is the name of the game! Anything (that has been tested and still functioning properly) should be repurposed creating saving in wasted Ee and reducing the poisoning our environment when items are buried in the earth at the local tip needlessly.
Never heard of Ee? It is a concept that creates a measurement of ALL things (not just electronics) that humans have made and the energy used in obtaining the raw material, processing the materials right through to a finished product and even should include the shipping of the item to the distributors/retailers.
If you would like to know more about Ee values, please take a look HERE
This component is from the MATSUNAGA (Yokohama Japan) Frequency Converter, intended for laboratory use and providing up to 240V AC at a user adjustable variable frequency. Not only that, the AC voltage output could be varied across a wide range AND the user could set current limiting, so it could alter all three aspects of the AC output wavefrom, frequency, voltage and current limiting. I actually fired this gear up and it was working great but oh dear! What to do with it? Sure you could put up on the workbench but at that sort of weight it needed a lot of space and a good solid workbench. I decided a while back to offer this equipment as a complete unit "elsewhere" online for a while but there was no interest at all so I pondered over what to do with this equipment (to keep or not to keep) but it had a few things going against it.
As a complete unit it was EXTREMELY HEAVY, over 50Kg, which means that my arms are now 30cm longer from lugging this beast around the workshops! ... but more seriously, shipping would have been difficult to ensure safe travel AND very expensive. It also had other minor cosmetic issues because it is not easy moving such a monster around so it suffered scrap marks on various places of the all steel casing.
Here is another precision component that can be put to good use once again ... this is quite a significant component in the equipment, not because of it's function but this is practically the ONLY non-Japanese manufactured component in the entire instrument. It is great when opening up some Japanese, American, German or UK laboratory equipment to find they still have full control over their local manufacturing - Australia, sadly, 'lost the plot' years ago with many instruments using "imported components" because local manufacturing has been allowed to die!
BOURNS - Precision Rotary Potentiometer
Made in Mexico
Type: 3590 Series
Part # 3590S-A26-502
Value: 5K
5% tolerance
Linearity: +/- 0.25%
2 Watts load (over 1000 hours)
Taper: Linear
10 turn with stops each end
Panel mounting (supplied with nut & washer)
Round 1/4" shaft (not a D shape with flat spot) with a slot at the end of the shaft. Fine for use with a grub screw or collet fixing knob or just leave it "as is" for through hole screw driver adjustment.
DIMENSIONS:
Body: 22.5mm diameter x 18.5mm height
Panel mounting hole required: minimum 9.5mm
Shaft length: 12.25mm
Side mounted solder tag terminations
COSMETIC CONDITION:
USED
Clean and undamaged physically
Solder tags have been cleaned and "dags" removed
TESTING:
Being a USED potentiometer,
Measured track resistance: 5045 Ohm, lowest resistance measured at 1 Ohm
NO issues with linearity that I could observe and no dead spots detected - nice smooth variation across the track.
To maintain the condition of this precision potentiometer, it has now been sealed in a clear plastic packet
