The information I offer is from years of field tests, lab tests, and concocted experiments by our PS guys that all hold PhDs in analog design. Without them, we couldn’t power or equipment. So we need them and we listen to them - daily.
I offer their sage knowledge to you for free.
Take it as you will and have a good night.
Speaking of Lab Tests...this one is something I have never seen.
We all know the AA 1.5V batteries..OK?
I was on a job on a roof 20º out and sleeting. The factory rep and I were checking a 30 HP inverter ( frequency drive motor speed controller ) on a air handling system, and were having trouble with noise interference on a component called the DC Trigger board.
We had the ocilloscope shipped in from the lab... and they never shipped the batteries with the probe handle. We were sort of yacked, but so what...no big deal.
I went to the radio shack and picked up a pack, and we installed them in the scope.
we could not get that damn thing to read..and it drove us crazy.
After 3 hours of fruitless attempts.. I thought maybe I picked up old battery stock.
Well, with my fluke VOM I checked the bats..all 1.68 V not to be exact...but one of the batteries showed reverse polarity. At first I thought I had the red on the negative, but no...the red on pos.+ and the black common on the negative -
of the battery...and low and behold... That one battery...just that one...was reverse polarity from the factory. In all essence..it was like installing one battery backwards even though it was installed the right way.
The circuit voltage was never produced in the control probe.
We could not believe it. ... What a bummer. Duracell too no less. LOL LOL