Use of Multimeter The Mission Covenant Church Holm

Use of Multimeter The Mission Covenant Church Holm Glad College

Outlook of Multimeter l Pointer and Scale – single pointer with different scale for different measurements l Selection Switch – select to measure voltage (ac or dc), current or resistance. The Mission Covenant Church Holm Glad College

Reading from Multimeter As the Selection Switch is at DC 25 m. A, the multimeter is used as a ammeter with fsd 25 m. A. l The 250 A scale is used. l Reading = 17. 5 m. A l The Mission Covenant Church Holm Glad College

Using as an Ohmmeter l With the input terminals shorted, set zero by turning the 0 Adjust Knob. l Remember to set zero again if the ohmmeter range is changed. The Mission Covenant Church Holm Glad College

Reading from Multimeter As the Selection Switch is at x 10, the reading has to be multiplied by 10. l The reading is 90, so the resistance is 900 . l The Mission Covenant Church Holm Glad College

Measuring AC Voltage l If AC voltage is measured, remember to use the “output “ terminal instead of the “positive” terminal. l The “negative” terminal is still used. The Mission Covenant Church Holm Glad College

Digital Multimeter Same as analogue multimeter but it has the advantage of having a large internal resistance. l If the reading is larger than the range, the reading cannot be shown. l The “COM” terminal is always used. The other terminal can be “ 10 A”, “ Am. A”, “V ” depending on the measurement. l The Mission Covenant Church Holm Glad College

Digital Ohmmeter l In the figure shown, the resistance of the resistor is 0. 824 k. l There is no need to multiplied 2 k for digital ohmmeter as it is the range, but not the conversion factor. The Mission Covenant Church Holm Glad College

Measuring AC/DC l Make sure that the switch is switched to the correct side for DC or AC measurement. DC The Mission Covenant Church Holm Glad College AC