How to Use a Cen-Tech Digital Multimeter to Check the Voltage?

Have you ever faced a situation where your voltage levels were low, and you weren’t sure what the problem was? 

A digital multimeter is an essential tool in every electrician’s belt. Cen-tech offers one of the most popular models on the market, but how do you use it to check for voltage?

A cen-tech digital multimeter is a device that can help electricians check the voltage in a circuit. This blog post will go over how to use this device and what you need to do when using it, so keep reading!

Digital Multimeter Basics

A digital multimeter is a type of testing tool which you can use to test several electrical values like current, Resistance, and Voltage. 

With this device, there’s never any need for guesswork because the quantity measured will be displayed on an easy-to-read screen at all times.

A significant advantage that digital meters have over analog ones is their ability to accurately measure voltage without parallax errors from slant angle distortion due to different viewing angles with reading instruments such as microscopes or laser devices.

The modern digital multimeter is a type of computer that makes measuring electrical values easier. Graphical representation, auto polarity, and auto-ranging are just featuring their offer to make your job simpler! 

Some devices can be connected with personal computers via USB or any other instrument bus to save measurements on the PC later. Recordings made by these meters can also be uploaded onto PCs for safekeeping later too!

Digital Cen-Tech Multimeter Features

Cen-Tech multimeters come with many features which are helpful in different scenarios. 

The most common feature you will find is the digital display screen on a Cen-Tech meter, but other perks like durability and accuracy make it worth your investment.


The Cen-Tech modern digital multimeter features a removable battery, mainly of the 9V variety. This is because a digital tester needs the power to work correctly, and without an LCD, it would be useless for most purposes. 

Some models come with backlit screens powered by your batteries, while others have automatic switching where you can save on electricity costs but still have the screen lit up at night or in environments like classrooms as well!

Fuse Protection

The Cen-Tech digital multimeter is so much more than a voltmeter, amperemeter and ohmmeter. It has an upgraded design that includes one of the most important safety features: 

A fuse to protect it from overloading or short circuits. Fuse damage can lead to expensive repairs, but not with this meter!

It’s also got all those traditional functions you know and love—alongside some new ones we’re sure will become your favorites soon enough!

LCD Digital Screen

Are you looking for an affordable, easy-to-use digital multimeter with a full range of features? The tech is the answer! It’s perfect if you need to measure electrical values accurately.

The backlit LCD screen on this device can help make measurements in low light rooms more accessible than ever before – no more squinting and straining your eyes when trying to read those tiny numbers! 

Plus, it has all the other great features that come standard with most meters like resistance measurement capability and auto power off after 20 minutes of idle time so that battery life won’t be wasted.

Selection Knob

Setting the multimeter to measure a specific electrical value is easy with its helpful selection knob. Be sure you put it correctly with AC or DC before any test so that no burns and electric shocks happen!

Ports for Banana Head Probes

The Cen-Tech multimeter is a multifunctional device that can help you get the job done. In particular, if your work involves electronics and circuitry, then this product could be invaluable to your productivity. 

The ports allow easy plugging in probes, so you’re never again stuck without one when it’s time to test an electrical project or circuit board component bayou need quick access. Too bad none are included with the purchase!


The Cen-Tech digital multimeter’s auto-ranging feature ensures that the meters always select the correct range for values under test. 

If you are using a four-digit meter, it will automatically display significant digits of measured voltage when measuring electrical value.

For instance, if your meter displays 29V rather than 0.029V on an electrical measurement, this means that its features have been set accordingly to capture all 4 digits after decimal points and not just 2 like other meters in its class might do.

Using the Multimeter

Check out the main selector wheel on your multimeter. Use this to select a function and sensitivity you need for measurements. 

You’ll notice three jack inputs arranged in a vertical line at the bottom right marked 10ADC, VΩmA, and COM- from top to bottom, respectively. 

The meter comes with two leads that fit these jacks: one is black while another is red; place them accordingly into their matching input ports (bottom left). 

On the side of it are other features such as an hFE Jack which connects directly into transistors so they can be tested or turned off if not needed by hitting the “On/Off Button.”

Voltage and Current Measurement

To measure AC voltage, rotate the selector to point to 750 in the ACV section at the top. Plug your red lead into VΩmA and plug your black lead into COM. 

Touch them both on exposed wires of a circuit you’re testing for an accurate reading! If it’s less than 250 volts, move down to 250 settings in this same area instead; these are more precise readings.

To measure DC voltage, leave the red lead in the jack marked VΩmA and the black lead in COM. 

Turn the dial counterclockwise to 1000 setting on the DRV section of your multimeter – this is where you’ll be measuring from 100mv up to 200volts. 

Take a reading by touching both leads onto exposed circuit wires; if it reads less than 20 volts, move down until you read between 20-200 volts depending on what’s happening with that wire or junction box!

To measure current, switch the red lead to the 10 ADC jack and leave the black one in COM. Turn dial set on the meter for the reading area of 10 amps (10A). 

Touch leads to exposed circuit wires, then note readings if below 0.2 amp turn off the meter and place red lead into VmA jack located at the bottom left side of front panel; continue turning counterclockwise until you reach 200 µ or desired accuracy is achieved.

Using a Cen-Tech Digital Multimeter to Check Voltage

Here are five easy steps to use your CenTech digital multimeter:

Step 1: Safety

Safety is an essential part of using a multimeter. You need to consider that electricity can be hazardous, and if care is not taken, it can lead to severe injuries or even death.

So when using Cen-Tech’s digital meters for Voltage checkups, make sure you’re taking safety precautions with the general considerations mentioned above, such as inspecting the meter in good working condition before use like ensuring probe insulation so current doesn’t directly come into contact with your body during readings. 

Lastly, make sure you know which function on each multimeter is used for what purposes (such as knowing how voltage checks differ from resistance).

Step 2: Rotate Selector to AC or DC Voltage

To set the function of your multimeter, first, turn to either AC voltage or DC voltage, where we would measure Voltage. 

In this case, with our selection knob pointing at V with a straight line, use it as an indication that you measure for DC Voltage and not AC. 

Likewise, if the pointer is on V wavy line, you will be taking measurements in volts supplied by home sockets which can go up to 700VAC while batteries supply a 200mVDC range, all within the 2V – 1000 Volt measurement scale depending on what type of meter’s ranges they have!

Step 3: Plug the probes.

At this stage, plug in the probes to the ports on your Cen-Tech multimeter. There are different ports on a multimeter that can measure various parameters like voltage and amps.

In measuring Voltage, you will use just two of these terminals, which are labeled COM (Common) and V/Ω/Hz. 

Plug one end into port number 5 marked with a “V” for volts or an arrow pointing up indicating ohms should be plugged there as well if it’s not already connected while going across to terminal 4 where the label says “COM.” 

This is what we’ll call point 1 now, so make sure both points have wires attached before proceeding by connecting wire 2 from probe A at Point 3 onto Port 6, which also has a

Step 4: Check Voltage

Now that you have made all the necessary adjustments, if you are testing a DC voltage, connect the black probe to the battery’s negative terminal and the red probe to the cell’s positive terminal. 

If AC voltage is being tested, then live wire should be connected with neutral while connecting probes on these wires for accurate power supply readings.

A multimeter measures Voltage by reading millivolts (mV). It will read in negative numbers because it compares your “voltage,” which is 120 volts when not measuring anything plugged into its COM port.”

Step 5: Taking your reading

The multimeter will use a tone to help you know what is happening. If the result on your screen shows no voltage, it means that all of those wires are clear and safe!

The Cen-Tech Multimeter has an output tone for when things go well, or not so much–but at least we’ll let you know if anything goes wrong.

It’s a breeze to measure voltage with the Cen-Tech digital multimeter. With this handy tool, troubleshooting has never been so direct! 

The ability to tackle different electric values makes it one of my favorite things about this product, too – and if you’re an electrical enthusiast like me, then I think you’ll love using it as much as I do.

About Blake Sutton

Blake has worked as an electrician for over 10 years, receiving his Journeyman Electrician license in 1998. Looking to take his professional electrical career further, in 2008 he received his Bachelor of Science in Electrical Engineering (BSEE) from the University of Texas in Austin. Blake now works full time as an electrical engineer, specializing in power systems.