Pages created and updated by Terry Sturtevant Date Posted: January 16, 2017


If you don't need the overview, you can progress to instructions on how to measure using the digital multimeter.

Overview of a Digital Multimeter (DMM)

Here is a basic digital multimeter (Amprobe 33XR):


dmm

[click image to get a larger image]



One of the most important things to understand is safety ratings.

The front of the meter is divided into 3 sections; display, control, and connections.

Manufacturer's data sheet

Here is the manufacturer's data sheet for the meter, which has very detailed information.

Display section

Here is the display section:


dmm display

[click image to get a larger image]

Note that in addition to showing the current value of the quantity being measured, there are options to show the maximum and minimum values within a certain time.

Control section

Here is the control section, showing all of the various settings:


dmm

[click image to get a larger image]

This particular meter can measure AC voltage , DC voltage , DC current , resistance , capacitance , frequency , temperature (with a probe attachment), and it can also check for diode operation and continuity .

Connection section

Here is the connection section, showing all of the possible connection points for leads:


dmm

[click image to get a larger image]

The most important thing to note here is that different contacts are used for current than for voltage or resistance. Note that the COM label stands for common, and this contact is used for all measurements.

Measurements using the DMM

Measuring Resistance


dmm

[click image to get a larger image]

Instructions for measuring resistance

Measuring DC Voltage


dmm

[click image to get a larger image]

Instructions for measuring DC voltage

CAUTION!!!!
Remember that current is measured in series, NOT in parallel.
You can destroy the meter if you don't do it correctly!
Be sure you know what you're doing before you try to measure current!

Measuring DC Current


dmm

[click image to get a larger image]

Preparing for current measurement Be sure to read this first!

Instructions for measuring DC current

Measuring Continuity


dmm

[click image to get a larger image]

Instructions for measuring continuity

Measuring Capacitance


dmm

[click image to get a larger image]

Instructions for measuring capacitance

Measuring AC Voltage


dmm

[click image to get a larger image]

Instructions for measuring AC voltage

Checking Diodes


dmm

[click image to get a larger image]

Instructions for measuring diode operation

Other Measurements

Instructions for measuring frequency of AC signals

Instructions for measuring temperature (with a probe attachment)

Resources

To view pdf documents, you can download Adobe Acrobat Reader .
get Acrobat Reader
If you need to update a browser, you might try Firefox which is Get Firefox!
Since this page uses cascading style sheets for its layout, it will look best with a browser which supports the specifications as fully as possible.

If you are looking for an office package, with a word processor, spreadsheet, etc., you might try LibreOffice which is Get LibreOffice!

Go to the main page for the Department of Physics and Computer Science.

Valid XHTML 1.1

Valid CSS!

WCAG
2.0
(Level AA)

Wilfrid Laurier University