Upload
engrroy
View
45
Download
3
Embed Size (px)
DESCRIPTION
how to use multimeter
Citation preview
Use of MultimeterUse of Multimeter
The Mission Covenant Church Holm Glad College
Outlook of MultimeterOutlook of MultimeterPointer and Scale
– single pointer with different scale for different measurements
Selection Switch– select to measure
voltage (ac or dc), current or resistance.
The Mission Covenant Church Holm Glad College
Reading from Reading from MultimeterMultimeter
As the Selection Switch is at DC25mA, the multimeter is used as a ammeter with fsd 25mA.
The 250A scale is used.
Reading = 17.5mA
The Mission Covenant Church Holm Glad College
Using as an OhmmeterUsing as an Ohmmeter
With the input terminals shorted, set zero by turning the 0 Adjust Knob.
Remember to set zero again if the ohmmeter range is changed.
The Mission Covenant Church Holm Glad College
Reading from Reading from MultimeterMultimeter
As the Selection Switch is at x10, the reading has to be multiplied by 10.
The reading is 90, so the resistance is 900 .
The Mission Covenant Church Holm Glad College
Measuring AC VoltageMeasuring AC Voltage
If AC voltage is measured, remember to use the “output “ terminal instead of the “positive” terminal.
The “negative” terminal is still used.
The Mission Covenant Church Holm Glad College
Digital MultimeterDigital Multimeter Same as analogue multimeter but it
has the advantage of having a large internal resistance.
If the reading is larger than the range, the reading cannot be shown.
The “COM” terminal is always used. The other terminal can be “10A”, “AmA”, “V” depending on the measurement.
The Mission Covenant Church Holm Glad College
Digital OhmmeterDigital Ohmmeter
In the figure shown, the resistance of the resistor is 0.824k.
There is no need to multiplied 2k for digital ohmmeter as it is the range, but not the conversion factor.
The Mission Covenant Church Holm Glad College
Measuring AC/DCMeasuring AC/DC
Make sure that the switch is switched to the correct side for DC or AC measurement.
DC AC
The Mission Covenant Church Holm Glad College