Digital Multimeter (DMM). A multimeter is a device that is used for measuring different parameters of electrical energy. Such as voltage, current, resistance, continuity and much more.
The multimeter has multi-functionalities like, it acts like ammeter, voltmeter, and ohmmeter.
There are two main types of multimeter. Analog multimeter and digital multimeter.
To measure the DC Voltage on multimeter. First, you need to rotate the rotary switch pointer tip toward the DC Voltage section. Normally we measure voltage up to 20 volts it’s better to bring a pointer tip on 20v. Then Connect the probe to DMM insert Black in Black input jack and red in middle red input jack. After that connect one probe tip to the battery terminal and the other to the next terminal. The digital value will be shown on the display screen on DMM it will show you the exact voltage of your battery or any DC source you connect.
If the value does not show on the screen then rotate the rotary switch to high value. the maximum range of this DMM is 500 volts DC.
Similarly like DC voltage. You can also measure AC voltage through DMM.
Just Move rotary switch pointer (Dial) toward the AC Voltage section .carefully Attach one prob with the red and other with the black of AC Voltage source. On the display screen, you will find the exact AC Voltage value. The maximum voltage range of these multimeters is 500 Volts AC. voltages are measured in parallel.
Precaution: Do not play with the AC High voltage. Operate it only with the help of a qualified person .remember high voltage is deadly.
To measure DC Current on multimeter. First, connect the device to the series. Move rotary switch toward DC Current section and attach the device in series. Attach one probe to the device one terminal .after that attach another end of the device to the battery terminal and the other prob to the other terminal of the battery. the multimeter display will show you the exact current passing through the device. the device could be LED, DC Motor or any other Electronic Components.
Current high then 20mA.Move the red probe to the other input jack. Which is design for the current limit up to 10 A. Inside the multimeter, a fuse of 10 Amperes is connected. Current greater then 10A could damage the fuse. Replace fuse after damage. It’s cheap and easily available in the market.
To find the resistance of a resistor first move the dial toward the Ohm section .then connect the resistor with the prob of the multimeter .resistor value will be shown on the display screen .if the value not show or show only 1 then move the dial to the high value. Check all m,k, and M.
For continuity test move rotary switch(dial) to the continuity section which is a diode sign/sound sign. Connect both the probs you will be hearing a beep sound it means that your connection is good. After that connect one prob to the one end of the wire and the other prob to the other end of the wire if you hear a beep sound the wire is connected and good to use. If you don’t hear the beep sound it means that your wire is break in between somewhere.
A continuity test is very important in circuit designing.
With the help of this multimeter, you can also find the temperature in both Celsius °C (Centigrade) and Fahrenheit °F.
A sensor is attached instead of probs. Move the pointer to the C or F for temperature. Then check the screen for results.
Hold button is used to hold value on screen for some time.
Light Button is used to visible screen on the Dark environment.
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