High Bay UFO technical question

3

3Ringsaturn

Member
Location
Oregon
Occupation
Retired Electronics Technician
Does anyone know the function of the little blu/yel trimmer potentiometer above the wattage selector switch & directly below
the Letter B in the following photo?

70876683.jpeg
 
They're functionally equivalent to adjustment barrels on a bicycle derailleur. It adjusts it so each indexed gear setting actually shifts into the proper gear.
 
On my light it's even more easily accessible than the on-line photo shown. I can't help but wonder if it might be an "onboard" dimmer, allowing for a minor adjustment of the light output. Perhaps something like trimming the output range between 60/100/120W to 100/120/170W? Especially since it's so close to the wattage selector switch, but I hesitate to mess with it if it's something more critical.
 
3Ringsaturn said:
On my light it's even more easily accessible than the on-line photo shown. I can't help but wonder if it might be an "onboard" dimmer, allowing for a minor adjustment of the light output. Perhaps something like trimming the output range between 60/100/120W to 100/120/170W? Especially since it's so close to the wattage selector switch, but I hesitate to mess with it if it's something more critical.
Click to expand...
I suspect you're right on the target. It's an independent technician friendly design. It could be for that purpose, or it could be for absorbing component manufacturing tolerance. Such design is not very high volume production friendly. Modern designs use digital calibration where automated test equipment takes readings and use software to rewrite calibration data through test points (those tiny contact pads you see on some products PCBs)

If you swap a seat on a modern car with one from a junk yard due to a passenger "incident", you may need to adjust the computer of the sensor reading for "nobody is sitting" for airbag detection purposes. It's cheaper to use a raw sensor, then attach a computer and push "set zero point" than it is to use a sensor built to provide a precise zero point value. This is very automated production friendly, but unfortunately, making adjustments to the computer parameters is not something that can be done without a specialized software and corporations take advantage of this to make the whole thing capital intensive to encourage only authorized dealers can work on it.
 
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