You need a 90 meg if coming off an X 10 probe, 99 to the    
   BNC.I think.    
      
   Off the top of my head I think you'll be down to 1/10th the upper limit   
   bandwidth, and on AC coupling it will take much longer to settle to the center   
   is there's DC on the input. Also not that in most scope front ends that will   
   NOT give you 10 X the max    
   DC input.    
      
   The sell X 100 probes, a bit more money per everything else. I used one for   
   certain things when faced with a scope that lacked 20V/div. Yeah, they gave   
   you more at the low end but took away from the high end. No more looking at   
   the collector of an HOT/   
   LOPT with a X 10 probe.   
      
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