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You will most commonly measure two electrical parameters when you're troubleshooting your appliance: resistance ( measured in units called "ohms") and voltage. Typically, both of these measurements are made on a single meter called a multi-meter, which you can set to measure either ohms or voltage ac.
Figure 1 shows how to measure resistance. Resistance ( or continuity ) is measured in units called "ohms." You'll commonly want to know the resistance of things like bake elements and solenoid coils. For example, a good bake element typically has a resistance of about 30 ohms. If your oven's not baking and you measure the resistance of the bake element and the meter doesn't move, then you know you have a bad element. Everyone is looking to save money, from coupons to tax deductions, so finding out if a repair is possible before you buy a whole new unit can be a great way to save. A simple ohm measurement can save a lot of money :)
Amp meter: Figure 2 shows a clamp-on amp meter (or amp meter) being used to measure current flow through a wire. This is a common test for determining whether or not a gas oven igniter is good or bad--only way to really know is by measuring its current draw and comparing to rated draw. You'll also want to measure current/amp draw in cases where you have an electric motor that runs for a few minutes then shuts off on it's built in safety to see if the problem is with the motor drawing excessive current.
Volt meter: Figure 3 shows how to measure voltage. A voltage measurement at the outlet should the first thing you do whenever you have an appliance that is completely inoperative...a simple power test is required if your electric dryer is running with no heat to make sure you have both powers at the dryer.
220-240 volt 4 prong power plug test for a dryer
220-240 volt 4 prong power plug test for a range
110-120 volt power plug test
220-240 volt 3 prong power plug test for a range
220-240 volt 3 prong power plug test for a dryer
Some helpful tips for volt and ohm testing...
Ohm: When ohm ( continuity ) testing a switch, thermostat, element, etc, you will need to isolate the item by removing the wires to that item so you can properly ohm test it...( write down what wire goes where first! ) This does not happen often, but sometimes a switch can ohm ok but still fail when real power is supplied to it. R X 1 is a good scale to start out with when doing some ohm / continuity testing.
Volt: Be careful!! Volt testing should be done across a switch, thermostat, fill valve (Figure 4), etc...for example - a volt test across a dryer thermostat - a reading of 220-240 volts AC across the thermostat leads is an open circuit / thermostat...a reading of 0 ( zero ) is a closed circuit / thermostat. A reading of 220-240 volts AC across the two wires to a bake element and no heat from the element is a bad element.
Item Number DM10T