Looks a lot like my EKG's
I got a boatload of guffaws and chuckles when I spent 2-1/2 times the amount for a KATO generator than what a LIMA or Stamford Newage would have cost. I guess the latest rage is industrial size Chinese generators that use 48-volt alternators powering large inverters. I prefer 1,200 RPM steady state.
Boy a magnetron would gag on that waveform above. Big Onans are pricey. Their control circuits look like they were conceptualized by Timothy Leary. Then there is the Generack-ack-ack-ack.
Some @#$/\&! Stole my recording 3-phase power quality analyzer several years ago. Yotta see what a 250 horsepower ice-plant motor startup does to power "quality". ¿560 degrees lag? Scope screen looks like a plate of spaghetti.