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I just brought a sperry dm-350A to test the switches on my dryer I thought they would come with instructions on how to use it but it didn't. Is there a place where I can go and learn what the symbols stand for?

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Just got mine from home depot. Stick the black wire into the COM port and the red wire in the V port on the right. The red wire is the positive and the black is the ground. Touch the red tip to the positive and the black one to a ground. Turn the dial clockwise to the right and you are measuring your voltage(i left it on 200).

Posted on Jan 31, 2010

  • Amquietone Oct 01, 2010

    Thank You guys so much! Was having the same issue with instructions and was going to use this unit for checking my dryer! You guys are lifesavers!!!


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This should help you out....

Posted on Jul 17, 2009

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The instructions for the DM-350A can be downloaded from I downloaded mine and the instructions ****, but maybe they will be more helpful to you.

Posted on Jan 27, 2010

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1 Answer

How do I know if I have continuity on my Sperry dsa 500

Set the knob to the ~600V position. With the power on/connected, place one test lead on one side of the fuse and the other test lead on the other side of the fuse. Be careful not to touch anything with your hand or you will get shocked. If you read voltage the fuse is bad. If you don't read voltage the fuse is bad.
Alternately you could DIS-connect power remove the fuse and test the fuse for OHMs, which on your meter is the last icon with the ((((.
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Have a GE electric dryer model DJXR433EC2WW. Whenever I select the dryer mode/time option, the dryer turns on by itself without turning the start switch (door closed). The dryer only stops when it...


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Does the Sperry DM-350A test for continuity? I can't seem to find a setting that works.

yes. But you have to change the LEADS down below. One must connect into the Omega connection at the bottom (looks like an upside down horseshoe). And the meter setting is where the arrow (?) symbol is. Touch the two leads together and it should "zero out". Now you're ready to check continuity.

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Just tested gfci receptacle with sperry gfci outlet tester and got all three (red,yellow,yellow) lights. What does this mean??

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Checking batteries

I assume a "DM-350a" is some kind of a digital multimeter. I Googled and found it might be a "A.W. Sperry DM350A 5 Function 17 Range Digital Multimeter" and looking at the ranges available on that meter, you can't really thest the battery "under load" the only reasonable way to test small batteries. the DC current only goes up to 200 milli amperes. A "C" or "D" size flashlight battery puts out 1 to 4 amps depending on conditions. That's 5 to 20 times the current readable by that meter. The volts on one of those batteries is probably 1.6 volts to 1.3 volts etc. If you live in the United States, I'd say go to Radio Shack and spend $5 to $15 and buy a battery tester like "Enercell Analog 9-Range Battery Checker, $14.99, Model 22-156, catalog # 22-156"
Then you and anyone in your family can read the instructions and test 8 or 9 different type batteries. Battery types: 1.5V button-cells, "AAA"/"N"/"AA"/"C"/"D", 6V, 9V, 12V, 15V and 22.5V..
This is not supposed to be an advertizement, and I have no interest in RadioShack,... but it's supposed to be instructional.

Small price, Good instruction to anyone who can read, and if anyone forgets, they can re-read. Testing a lot of batteries in a sitting goes very fast with these.

Differently, with the sperry, or any voltmeter, you'd have to select a resistor small enough to draw the current, and large enough not to overheat or burn, connect it and measure the loaded voltage drop, compare the voltage and current of the loaded battery, and compare it to that of a new battery, and a battery you might consider too weak for your application.. Voltage equals amps times resistance, and power equals amps squared times resistance... Really, buy a battery tester.
Regards --- GooseBay_Camper

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Checking batteries AA D cel with a sperry DM 350A digital multimeter

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