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How do I set up the Sperry DM350A to measure amps?

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Looking at a picture of this meter, the maximum current it will measure is 200 mAmps. This is 0.2 Amps, 2/10 amp. Although I don't know what you might be measuring on a motorcycle with this meter, it does not have sufficient range to be of any use on a bike.

However. Plug you black lead in the "COM" hole and the red lead into the "A" hole. Set the function selector the "A", "200m" setting. Now the meter must be placed in series with the circuit. Disconnect a wire from the circuit and connect it to either lead of the meter. Connect the other lead of the meter to where you disconnected the wire. When the circuit is energized, the meter will show the current flow and, by indicating either nothing or the Neg sign in front of the indicated value, the direction of flow.

If the meter shuts down immediately after you energize the circuit, you have probably exceed the current handling capacity of the meter and blown the protection fuse. I never use a meter that is not capable of handlling at least 10 amps of current. But, having been a mechanic for many years, I've hardly ever used a "amp meter" to diagnose a problem. What exactly are you trying to work on? Maybe I can help.


Posted on Sep 05, 2010

  • pekar27 Feb 06, 2011

    LOL you said "A" hole!

  • wd4ity
    wd4ity Feb 06, 2011

    Yes, that's how it's labeled. "A" which is short of AMP OR AMPERAGE . You must wire the meter in "series" in the circuit. If you have the red lead the "V/O" hole, you have the meter wired for "parallel" insertion into the circuit. When I said "A" hole, I mean the hole in the face of the meter labele "A", nothing else.



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