- Field measurement of harmonic distortion- how? - 1 Update
- Windows 11 coming soon, Windows 10 retiring from 2025 - 1 Update
- Increasing 20x4 LCD contrast range - 1 Update
| Phil Allison <pallison49@gmail.com>: Jun 30 04:37PM -0700 Wond wrote: ============== > >> My son has a new welder, spec'd 5% max THD input AC power. > > ** The welder is clearly not happy with power from a "modified square > > wave" DC inverter. -------------------- > My thinking too, but it appears from available bumf that inverter > types claim less THD than cheap conventional gens. ** Oh dear - FYI a "DC inverter " runs off a 12 or 24V battery. " Inverter generators " are pure sine wave. The AC supply has a few percent of 3rd and 5th harmonics. > It would be interesting to see how Agilent/Keysight measure it in > their DMM. ** For sure. I saw nothing on the Agilent site about it. Can you borrow a scope to take a peek at the wave? .... Phil |
| Three Jeeps <jjhudak4@gmail.com>: Jun 30 10:58AM -0700 On Sunday, June 27, 2021 at 3:31:59 PM UTC-4, Ralph Mowery wrote: > > Keep in mind that here are three major alternatives to Windows: Mac OS, Linux, and Chrome. > Those are of no help if the programs I want to run have no equivelent > and are only written to run under Windows. You may be able to get away with running a Windoz as a guest OS on and VM host OS such as Linux or OSX. If the Windoz app uses any special I/O drivers, it may not work. It is cheap to try it and see. You can try VirtualBox (free) which I've found works fairly well for almost all of my windoz apps (under both OSX and Linux). VMWare is a very good commercial product that you could also try...I don't remember if they have a free or trial version. J |
| Rob <nomail@example.com>: Jun 30 05:11PM > And unfortunately the contrast is controlled in software, probably via > PWM there's no direct connection to an analog adjustment pot. There still will be some line with a varying voltage that doesn't do anything else, and which you can try to pull up or down using a resistor. |
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