5/11/2021 0 Comments How To Use Multimeter In Urdu Pdf
Dirt and tar can be a particular problem if the equipment is in an environment where smokers are present.Multimeters are ideal items of test equipment for finding many faults in a transistor or other form of electronic circuit.
The test meter can be used to test these and often locate the fault very quickly. Only qualified persons should attempt to repair mains powered equipment or equipment that contains high or hazardous voltages. Also, only the right test equipment, with the right certifications and capable of handling high voltages should be used where high voltages are present. They often arise from movement and physical damage, so it is often easy to find these faults and issues. This is easily done using a multimeter set to a voltage range. Measure the voltage using a test meter at the points where the supply enters the circuit board. If the multimeter indicates that there is no supply voltage then there can be a number of possibilities to investigate. If this is the case remove the battery and clean any residue that may have leaked onto the battery holder and in particular the contacts. The residue can cause the contacts to become corroded, so it is necessary to clean the contacts well. Check the voltage with the test meter when the radio is turned on. If the battery cannot supply the current required, then the voltage will fall as the radio is switched on. This can be checked by disconnecting any power source - the power lead must be removed from the power to completely isolate the equipment. Then check for continuity across the switch, checking it on both on and off positions - use the Ohms range on the multimeter for this. Also remember that the switch may switch both sides on the incoming power, i.e. Ideally remove the fuse and check for continuity with the multimeter. To overcome this it can help to unplug and then re-mate the connector. With time and movement of the equipment, leads can become fractured. One particular area can be the battery lead - these leads are particularly prone to damage as the need to be moved and if the battery has been replaced in a rough manner this could result in a lead being broken. Again it is worth checking any connectors that may have corroded or oxidised with time, and check for any broken connections. Again any switches, and connectors along with any broken wires should be checked. ![]() Over time switches can fail as dirt and corrosion accumulate on the switch contacts.
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