Modern homes are astonishingly dirty with respect to radio frequency interference (RFI). The reasons are many, but boil down to the proliferation of electronic devices we all use.
LED lights have many advantages. But being electrically clean is not among them. The switched-mode power supplies inherent to their design can be controlled. But, as with most things, at a cost. Most LED bulbs come out of China and their emissions are nothing to be proud of.
If someone was an amateur radio operator, I'd tell them to connect their radio to a battery, kill the mains in their house, and see how much their noise level dropped. And then go circuit by circuit to locate and identify particular troublemakers.
Why does any of this matter to a handloader? Because we increasingly are using very sensitive, very sophisticated electronic devices like the A&D FX-120i which may be affected by RFI.
If you're a ham radio operator, RFI is kinda in your face - you can't help but know that it's there. But for the vast majority of people, the only clue they have is sudden odd behaviors in a piece of electronic equipment. Like an expensive balance that suddenly begins behaving erratically.
Alas, I don't have any easy answers. Even for those with the test equipment and a commitment to finding RFI, It can be a daunting challenge to identify its source. But knowing that it's there, and that it can cause all sorts of odd behaviors, is a start.
Some stuff to beware of.... electric motors of all kinds, microwave ovens, washers and dryers, HVAC units, any kind of lighting that's not incandescent (most all lighting these days, in other words), flat-panel TV's (especially plasma), cheap wall-wart chargers (including, ironically, the OEM unit that A&D ships with their FX-120i and the replacement unit that Adam ships with his AutoTrickler), and basically anything with a switched-mode power supply.
Not all electronic stuff is dirty, of course. And not all stuff from China is bad. But a great deal of it is. And the cheaper it is, the more likely it is to pollute your house with unseen electromagnetic hash.
If you're worried about power fluctuations, something cheap like this at your bench
https://www.amazon.com/gp/product/B07JN1JDC1/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
next to your A&D wall-wart will quickly tell you.
Honestly, though, behavioral anomalies that routinely happen at certain times of the day/night are rarely because of power fluctuations. They're usually because of something on a schedule or a timer.
Poor grounding - not at the loading bench itself, but rather of the entire house - can make things worse. And there are a great many homes with one or more grounding elements installed poorly or wrong.
My general advice is to control what you can control... starting with making sure that the
physical environment at your loading bench is beyond reproach. It's funny how often electronic instability disappears when the bench itself gets more robust; or when the HVAC vent that no one thought about for the longest time finally gets closed.
http://www.arrl.org/files/file/RFI/Light_Bulbs.pdf
P. S. The complaints about the AutoTrickler stopping .02gr low... it does that on purpose, by design.
