I am currently trouble shooting a 120/240 volt AC generator. It's a military surplus 10kw unit. There is a problem where AC current is getting into the DC controls. The AC invading voltage is erractic. So this makes it hard for my Fluke 86-5 digital meter to trace and read it. Digital meters are to slow when dealing with problems like this. I need a good analog meter that blocks the DC while reading the AC. With the added ability to read frequency. My Simpson 260 does not block the DC while on the AC position. So what brand and model analog meter would work?