How to measure voltage ,resistance and current and check continuity of a given circuit using multimeter observation table?
Answers
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Theory
Multimeter. It is a single measuring device acting as an Ammeter, a Voltmeter and an Ohmmeter. For this reason, it is also called AVO meter.
It can measure alternating as well as direct current and alternating as well as direct voltage in addition to resistance. For this purpose its panel is divided into five different sections. There are many ranges in each section so that it can measure from micro (10-6) to mega (106) units. Rotation of a knob changes the section and the range in one section.
— Rotation of knob for change in ammeter range, brings shunt resistances of different values in circuit in parallel with the coil.
— Rotation of knob for change in voltmeter range, brings series resistances of different values in circuit in series with the coil.
— Rotation of knob for change in ohmmeter range, brings different resistances in circuit in series with the multimeter cell.
Carbon resistors are frequently used in electrical and electronic circuits and their values vary over a very wide range. A colour code is used to indicate the value of the resistance.
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A carbon resistance has four different concentric coloured ringe or bands on its surface. The first three bands a, b and c determine the value of the resistance and the fourth band d gives the percentage of accuracy called tolerance. The resistance of carbon resistor R = (ab x 10c ± T %) Ω.
To read the value of carbon resistance, the following sentence is found to be of much more helpful.
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The following table provides the colour code for the carbon resistors :
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Procedure
Mark the given carbon resistors as R1,R2, R3.
Note the colour of first, second, third and fourth ring for each resistor.
Plug in the probes of the multimeter in appropriate terminals. Select the appropriate range, short the other ends of probes and adjust zero. Turn the terminal marked ‘Adjust’ such that the needle of the meter shows full scale deflection and reads zero ohm.
Separate the metallic ends of the probes. Insert the resistor R1 to be measured in between the metallic ends of the two probes and read the deflection of the pointer on the range selected.
Repeat the step 4 for other resistors R2and R3 each time selecting the appropriate range and testing the zero.
Now convert using the colour code table, the values of resistors in ohms and write their values with tolerance.
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) Continuity of given circuit
Set the selector switch to ohm, range MΩ.
Touch and press the ends of probes at A and B, full scale deflection indicates continuity.
Similarly check in succession the continuity between terminals B and C and terminals C and D.
Never place the probes ends between terminals connected with the terminals of the battery.
In digital electronic multimeter for continuity test rotor is set to mark 0 and a buzzer , sounds when probes are connected to ends of components tested.
Inference
The measured values by multimeter match with decoded values of resistors.
A.C. and D.C. voltages marked on voltage sources match with voltage measured by multimeter.
Precautions
Instructions for handling the multimeter should be gone through thoroughly as it is a very handy instrument and is likely to get damaged if carelessly or ignorantly used.
Select the appropriate parameter current, voltage or resistance to the measured and set it on appropriate range.
If range of the parameter measured is not known, start with maximum. For measuring V, never connect more than maximum 600 V.
hope This May help uh
The multimeter is used to check different quantities that are given below
- The multimeter also know as the digital multimeter. It is used to get the amount of voltage, current and resistance in the circuit.
- Not only this but you can also check the continuity of wires and fuses.
- To measure the voltage, you just need to plug in the wires in the multimeter that are double sided wires.
- One sided connected to the circuit and other is connected to the multimeter. Then rotate the rotator on the multimeter to the sign of voltage.
- Similar is to be done with the current and resistance.
- To check the continuity same as the above process. You can even check the direct and alternate current.