Measuring Resistance of component in circuit Using Digital Multimeter - Electronics LAB

Measuring Resistance - Using Multi Meter

General precautions:
1. Measure resistance when components are not connected in a circuit.
2. Remember to ensure that the circuit under test is not powered on.
3. Ensure capacitors in a circuit under test are discharged.
4. Remember that diodes in a circuit will cause different readings in either direction.
5. Leakage path through fingers can alter readings in some cases.



Using Multimeter:
There are a few simple steps required to make a resistance measurement with a digital multimeter:


1. Select the resistance that needs to be measured and estimate what the resistance may be.


2. Insert the probes into the required sockets. The digital multimeter will have several sockets for the test probes. Insert these or check whether they are already in the correct sockets.

3. Turn on the multimeter.

4. Select the required range. When the digital multimeter is on, the required quantity that is voltage, current or resistance and its range can be selected. The range selected should be such that the best reading is obtained. Normally, the multimeter function switch will be labeled with the maximum resistance reading. Choose the one where the estimated value of resistance will be under but close to the maximum of the range. In this way, the most accurate resistance measurement can be made.

5. Make the measurement. The probes can be applied to both the two terminals of the resistor. The range can be adjusted if necessary. The value of the resistor is shown on the mutimeter display.

6. Turn off the multimeter:Once the resistance measurement has been made, the multimeter can be turned off to preserve the batteries. It is also wise to turn the function switch to a high voltage range. In this way, if the multimeter is used again for another type of reading, then no damage will be caused if it is inadvertently used without selecting the correct range and function





2 comments:

  1. In Resistance mode, even before test leads are connected to a component, a digital multimeter (DMM) automatically begins taking a resistance measurement. The MΩ symbol may appear in the display because resistance of open (unattached) test leads is very high. When the leads are connected to a component, a DMM automatically uses the Auto range mode to adjust to the best range. Pressing the Range button allows a technician to manually set the range.Thanks for the post. helpful indeed.

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    1. We love it when readers share their knowledge and Experience to add up contents. Thanks for your valuable feedback.Keep Visiting us and keep encouraging us.

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