From: gherold@teachspin.com   
      
   On Saturday, May 16, 2020 at 11:07:29 AM UTC-4, Bob Engelhardt wrote:   
   > If there's a better site/forum for this question, please let me know.   
   >   
   > I have an old (mid 80's) Sears Craftsman generator - 4 cycle B&S engine   
   > & 120v, 1350W rated output.  (Jeff - model 580.328172)   
   >   
   > I haven't used it in decades so I cleaned it up & checked it out with   
   > the intent to donate it to the Habitat ReStore.   
   >   
   > Imagine my surprise when I measured the no-load output voltage at 134v   
   > (with Fluke 36 True RMS meter).  That dropped to 117v with a 10A load.   
   >   
   > The no-load frequency is 62Hz, which is what the manual says it should   
   > be (3720 RPM).  That drops to 59Hz at 10A load.   
   >   
   > The manual also claims a +-5% voltage regulation.   
   >   
   > Seemingly unrelated, but ... the DC output is only 7v.  Also, there is   
   > 1500Hz+-, 20v+- PP superimposed on the 120v 60hz output.   
   >   
   > Note that I never before checked the voltage and I've never had a   
   > problem with it damaging loads (refrigerator, freezer, ??).  So either   
   > it's always been over-voltage & no-matter, or it's changed while sitting   
   > idle.   
   >   
   > Any ideas about what's going on here?  And to diagnose & fix?   
   >   
   > Thanks, Bob   
   >   
   Those numbers seem fine to me.  What's the voltage with a 100W   
   incandescent as load?  (Or even a 10-20W resistor?)   
      
   George H.   
   who gave his old Sears gen. to his brother when he got a new one   
   with a much bigger muffler!   
   >   
   > The manual spec page:   
   > https://imgur.com/phBAUpM   
   > The circuit schematic:   
   > https://imgur.com/vA6RIsa   
      
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