From: terrell.michael.a@gmail.com   
      
   On Tuesday, August 15, 2023 at 10:42:33 AM UTC-4, Bob Engelhardt wrote:   
   > I'd like to use both traces on my scope to look at 2 voltages that are    
   > without a common reference. E.g., across R1 & across R3:    
   >    
   > ________R1____    
   > |    
   > R2 ...    
   > |    
   > R3    
   > ____|______    
   >    
   > I know that there are isolation probes to do this ($$$), but I'm    
   > wondering if there is some clever other way to do it. In my minimal    
   > experience I can't see one, but I'm hopeful that someone more clever    
   > than I has one to share.    
   >    
   > Thanks, Bob   
   You could do it with a four channel cope that allows combining two channels in   
   summing mode, like the cutom probes do.   
   Can you just use two voltmeters, instead?   
      
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