To study the working of multimeter ~ MONU TUTORIALS ACADEMY

Working of multimeter

Multimeter is quite important as it measure voltage current resistance and other accept of electricity and circuit.usually these are small in size run on batteries and carries large digital displays.There is also not to select the measurement function and a pair of test leads for connecting the device to the circuit. Digital metre have revolutionized the test equipment world. Better accuracy is now easilyattend able more function can be incorporated with one metre and auto ranging as well as automatic polarity induction is used. Technically, digital multimeter are classified as electronic multimeters however, digital multimeter do not use a metre movement.instead a digital signal which is preceded by electronic circuit and displayed numerically on the metre face.

digital multimeter eliminate the need to estimate digital multimeter is very precise in its reading sometimes more precise than is called for is unable.also be aware that the indicated parameter may change with range use this is primarily due to the change in accuracy and where the meta round off.

there are many types of digital multimeter summer bench type multimeter some are designed to be handheld most type of digital multimeter have input impedance of 10 mega ohm and above. They are very sensitive to small change in current are therefore more accurate.

Switch position and their function in common multimeter are as follow.

Test for continuity

Continuity is the presence of complete path for current flow. The continuity test feature a beeper that sound of its circuit is complete. The bi beeper hello you to perform quick continuity function detect interminate open and short losting as little as one millisecond. This brief contact cause the metre to emit a short beep.

Precautions

Core mustbe taken when using test instrument not only for the protection of the instrument and circuit under test but for protection of the user.
Always start by starting the range switch at a value higher that which you reasonably except to measure if not you could damage the instrument.
Make sure your multitester is set in the right mode. Trying to measure voltage with the mode set on AMPScourt destroy the matter and possible cause harm to operate also some metre are destroyed by trying to measure voltage if metre is set to measure resistance.
if you have a choice of finding a fault in a circuit with dangerous voltage on it by the testing voltage on measuring resistance turn off the power and use the latter
Keep the test lead in good condition no crack insulation keep proper Sharp connector tight.
do not place the instrument in a place where it may be pulled off and on to the floor or onto the circuit.
if using an ammeter that require that it be inserted in series with the measured circuit turn off the power make your connection turn on the power and measure. Repeat the procedure disconnecting the metre.
Clamp on type ammeter to not required the circuit to be opened for insert ation of the myth safer and faster to use.

This is the the physically diagram of multimeter

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