How do you read an ohmmeter reading?
It will be in ohms, K ohms or M ohms. If you have set the scale where the upper end of the range is below the resistor value, you will see either a flashing display or sometimes OL for “over limit.” Turn to a higher scale until you get a good reading. Repeat the measurements with your other test resistors.
What is the first thing to when using the ohmmeter?
The first step in using an ohmmeter is setting it up. Once you’ve done that, you can use it to measure the resistance of any circuit simply by holding the probes on opposite sides of it.
How do you adjust an ohmmeter?
There should also be a small adjustment knob or “wheel” on the analog multimeter to calibrate it for “zero” ohms of resistance. Touch the test probes together and move this adjustment until the needle exactly points to zero at the right-hand end of the scale.
What are the do’s and don’ts in handling the ohmmeter?
OHMMETER Safety PRECautionS Be certain the circuit is deenergized and discharged before connecting an ohmmeter. Do not apply power to a circuit while measuring resistance. When you are finished using an ohmmeter, switch it to the ofF position if one is provided and remove the leads from the meter.
What should the screen read on an ohmmeter?
Note that the scale reads in the reverse direction of most conventional measuring scales: that is, less resistance is to the right and more resistance is to the left. If yours is a digital ohmmeter, the screen should read “0” when you touch the 2 probes together.
How to use an ohmmeter to measure ground resistance?
Change the sensitivity on your multi-meter to get a more accurate reading. Do not test a live circuit. Do not handle live wires. Turn off electricity before testing. Use a digital multi-meter to measure the resistance of your electrical system. An Ohm (often symbolized by the Greek letter Omega) is a unit of resistance in electrical systems.
Do you have to buy ohmmeters with your meter?
These may also be color-coded, with the black lead going into the negative plug and the red lead going into the positive plug. Ohmmeters are typically sold along with these test leads. If your meter was recently purchased, you should not have to buy your leads separately. Be sure to plug the short ends of the leads into the sockets.
How to calculate resistance for 0.01 ohm?
For resistances < 0.01 ohm, you have to pass a current through the component with one set of leads and measure the voltdrop across the component with another set of leads, and then do a R=V/I calculation either on paper or inside the instrument.
What do you need to know about the ohmmeter?
Basic Ohmmeter Use. Basic Electricity. Explain how an ohmmeter is able to measure the resistance of a component (in this case, a light bulb) when there is no battery or other source of power connected to it: Also, identify the reading you would expect the ohmmeter to indicate if the light bulb were burnt out (failed “open”).
What happens if I Set my ohm meter too high?
If the range is too high, then the reading will stay on 0 or close to it. If you set an analog ohmmeter’s range too low, it will cause the needle to snap rapidly to one side, potentially damaging it. Turn the range down on the ohmmeter 1 step at a time to test the circuit.
When to test resistance in a digital ohm meter?
Test resistance in a circuit when it is unpowered. In other words, don’t connect the circuit to a power supply when using your ohmmeter. Doing so could damage your digital ohmmeter or invalidate your resistance reading. Take individual components out of the circuit before testing them.
Which is the main element of the Ohm reading process?
Apart from understanding the scale of the digital ohmmeter, understanding the resistance value is the main element of the ohmmeter reading process. The numbers are typically front and center in the digital display, and usually extend to one or two decimal points.