How to wire digital dual display volt- and ammeter

Once I bought a popular “Chinese” volt- and ammeter gauge with 100V/10A ratings. Unfortunately, I didn’t find any good resource about how to wire/connect it. Actually, it’s not rocket science, but I had waited for it 2-3 weeks and didn’t want to blow it at first try. All the diagrams were somehow too technical for me.

The original article included only one variant of these digital volt- and ammeters. Now I have included three most common variants of them. If you order digital 100V/10A volt- and ammeter gauge from China or other markets – it’s most likely one of following.

They all have a bit different wire colors. I will cover wiring for all of them in this post.

100V / 10A DC volt- and ammeters with differently colored wires

100V / 10A DC volt- and ammeters with differently colored wires

These meters are good when you want to measure current and voltage at the same time. A feature that usual multimeters lack. For example, I have used it to measure the output of my DIY solar panel. They are inexpensive and easy to connect.

How do these ammeters work?

These meters calculate current flow by the voltage drop across the shunt resistor. They have built-in shunts that should withstand measuring as much as 10 amperes. You must see shunt behind your volt- and ammeter. That small bridge bent from a thick wire on PCB.

Built-in shunt on volt- and ammeter-100V / 10A / DSN-VC288

Built-in shunt on volt- and ammeter-100V / 10A / DSN-VC288

Important! If there is none- this guide is not for you. You need a wiring diagram with an external shunt instead. Also when measuring current that exceeds 10A which can be handled with the internal one.

Wiring basics

They are basically the same. There is a connector with thick wires and connector with thin wires. But coloring of wires vary. Amperage measurement is done through passing power through thick wires. Power to the meter itself is fed through thin wires.

They all can be wired such way that you don’t need a separate power supply for the electronics part. You can use the same power supply where your measured load gets electricity. But then you can only use a maximum of 30V since it’s maximum operating voltage for the meter itself. Also, you can’t measure voltages below 4.5V. If using the same power supply you even can leave thin black wire un-connected since they have common ground/GND.

Red and black thick wires + thin yellow, black and red

This one makes the most sense to me and it has model number DSN-VC288 marked on the back.

10A / 100V volt- and ammeter wiring with thick red, black wires and thin black, red, and yellow

10A / 100V volt- and ammeter wiring with thick red, black wires and thin black, red, and yellow

Example on Amazon

 

Red, black and blue thick wires + thin black and red

This exact one was in my original article. Not very popular anymore I guess since can’t find many offers for these.

Wiring volt-ammeter without external power supply for chip

Example on Amazon

Red, black and yellow thick wires + red and black thin wires

Important! I have not tested this one myself. If someone can confirm this is correct I would be very thankful. From the info I found from sellers and one youtube video- this one has a bit tricky coloring. Voltage sense line is also a thick wire and it’s not yellow. It’s a red one instead!

Can someone please confirm this schematic is correct?

10A / 100V volt- and ammeter wiring with thick red, black and yellow wires and thin black and red

10A / 100V volt- and ammeter wiring with thick red, black and yellow wires and thin black and red

Example on Amazon

Here are some photos of testing them

Wired and testing with load

Wired and testing with load

 

Wired and testing with load- overview

Wired and testing with load- overview

 

One test with the external power supply

Volt ammeter with external power supply

Volt ammeter with external power supply

 

10A / 100V volt- and ammeter testing, DSN-VC288

10A / 100V volt- and ammeter testing, DSN-VC288

 

Comments

  1. Reply

    • By Janar

      Reply

    • By henk stek

      Reply

  2. Reply

  3. Reply

  4. By Aggelos

    Reply

    • By Janar

      Reply

      • By Aggelos

        Reply

    • By Aggelos

      Reply

  5. By James Schaffner

    Reply

    • By Janar

      Reply

  6. By Andy

    Reply

  7. By Winston

    Reply

    • By Janar

      Reply

  8. By Laszlo

    Reply

  9. By Ian

    Reply

  10. By Don

    Reply

    • By Janar

      Reply

  11. By Mike

    Reply

  12. By jure

    Reply

  13. By Antonio

    Reply

    • By Janar

      Reply

  14. By Sir

    Reply

    • By Janar

      Reply

  15. By acca

    Reply

    • By Janar

      Reply

  16. By kenny

    Reply

    • By Janar

      Reply

  17. By Stanley

    Reply

    • By René

      Reply

  18. By Alan

    Reply

  19. By Roberto Carlos TIERNO

    Reply

  20. By Jaison Mendez

    Reply

  21. Reply

Leave a Reply

Your email address will not be published. Required fields are marked *

54 + = 62

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close