A few comments
1: If your generator fired two surge protectors.. GET A BETTER GENERATOR
2: Contractor's type. open frame, engine runs 3600 RPM, Ear plugs recommended, are nortorious for dirty power and though your device may run well for a while.. Life shortening is likely happening.
3: Inverter generators like the Honda EU-2000i or Yahama EF-2400i Nice clean power, better than commercial mains in many cases.
4: Reduced speed generators 1200 or 1800 RPM Generally like the Onan Emarald 5500 I'm sitting on just now.
Roughly the same quality as commercial mains. Clean or close to it.