I recently purchased this:
https://www.ebay.com/itm/Digital-Tachome...woV3BBEV2b&_trksid=p2332490.c100935.m2460
It came a few days ago and I took another day to unbox and test it.
One is supposed to cut off a reflective piece of tape, attach it to whatever is rotating, then Aim the device at it, where a 'laser' is supposed to reflect off the sticker and the device count the revolutions.
Mine has no red laser/LED
It reads zero.
I took my IR temp gun, which does have a laser, held it side by side with the unit, aimed it at reflective sticker, and then it reads the rpm.
The seller insulted me by saying perhaps I installed the battery backwards, which is impossible as the slots for the + and - of the 9v battery are different width, and/or they assumed I was just using it incorrectly, cant read directions, or cannot grasp simple concepts.
I guess in this day and age they have to assume absolute overwhelming ignorance and vapid stupidity of the consumer, and they'd be fools to assume otherwise, as just think how stupid the average person is, then understand half of the rest of them are even more so.
I was wanting this device primarily to see just how fast that 320 amps Leece Neville alternator is spinning via the Auxiliary drive pulley on the detroit diesel at idle, and of course fans, the Leece was the excuse to finally purchase.
I told seller I'm willing to try and fix it, but they better not assume I am a knuckledragging idiot who can't figure out how to press a button and aim a light at a spinning reflective sticker again.
If it worked as described I'd be pretty happy, and I can still make it work if I put my IR temp gun right next to it and aim its laser at the sticker. Honestly I want to just fix it if possible, perhaps just a fractured or missing solder joint on the LED or laser. Kind of doubt it is an actual laser, but I guess its possible.
I'm kind of interested to see just how much slower a dirty fan spins than a clean fan at the same exact voltage. The tach opens up all sorts of new data collecting and potential experiments.
My balancing of fans is usually using a small piece of tape on the fan hub. The reflective tape for the tach might have to take over that task. Should be interesting to see amp draw and rpm of a balanced fan vs unbalanced one at the same voltage.
All hail actual Data.
https://www.ebay.com/itm/Digital-Tachome...woV3BBEV2b&_trksid=p2332490.c100935.m2460
It came a few days ago and I took another day to unbox and test it.
One is supposed to cut off a reflective piece of tape, attach it to whatever is rotating, then Aim the device at it, where a 'laser' is supposed to reflect off the sticker and the device count the revolutions.
Mine has no red laser/LED
It reads zero.
I took my IR temp gun, which does have a laser, held it side by side with the unit, aimed it at reflective sticker, and then it reads the rpm.
The seller insulted me by saying perhaps I installed the battery backwards, which is impossible as the slots for the + and - of the 9v battery are different width, and/or they assumed I was just using it incorrectly, cant read directions, or cannot grasp simple concepts.
I guess in this day and age they have to assume absolute overwhelming ignorance and vapid stupidity of the consumer, and they'd be fools to assume otherwise, as just think how stupid the average person is, then understand half of the rest of them are even more so.
I was wanting this device primarily to see just how fast that 320 amps Leece Neville alternator is spinning via the Auxiliary drive pulley on the detroit diesel at idle, and of course fans, the Leece was the excuse to finally purchase.
I told seller I'm willing to try and fix it, but they better not assume I am a knuckledragging idiot who can't figure out how to press a button and aim a light at a spinning reflective sticker again.
If it worked as described I'd be pretty happy, and I can still make it work if I put my IR temp gun right next to it and aim its laser at the sticker. Honestly I want to just fix it if possible, perhaps just a fractured or missing solder joint on the LED or laser. Kind of doubt it is an actual laser, but I guess its possible.
I'm kind of interested to see just how much slower a dirty fan spins than a clean fan at the same exact voltage. The tach opens up all sorts of new data collecting and potential experiments.
My balancing of fans is usually using a small piece of tape on the fan hub. The reflective tape for the tach might have to take over that task. Should be interesting to see amp draw and rpm of a balanced fan vs unbalanced one at the same voltage.
All hail actual Data.