How to Use a Dual Volt Ammeter

This shows you how to use the dual digital volt meter / ammeter.

You will need:

1. Breadboard with 3.3 v power supplier

2. LEDs

3. Dupont male to male

4. Cable Connectors ( see above)

5. Dual Volt ammeter

Using Dupont cables, connect the the the dual meter thin red cable to the positive rail of the breadboard and the dual meter thin black cable to the ground rail.

Power on the breadboard power supply and you should see readings on the dual meter. They should be zero or less than 0.03.

Power off the breadboard power supply.

Connect the positive wire from the LED to the white cable connector. (Should you not not know which is the positive wire, use a button battery to determine this). Also, I used some old Xmas leds - not more than 3 bulbs - which I trimmed using a wire cutter.

Connect a Dupont cable from the positive rail of the breadboard to the positive wire of the LED on the white cable connector. Next, connect a Dupont cable from the negative rail of the breadboard to the negative wire of the LED on the white cable connector.

Power on the breadboard power supply and you see that both the dual meter and LEDs are power on.

To measure voltage, turn off the breadboard power supply then connect the dual meter thin yellow cable to the junction on the white cable connector where the positive wire of the LED is connected, i.e. the thin yellow cable and LED positive wire are both connected to the same port of the white cable connector.

Switch on the breadboard power supply and you should see a voltage reading.

To measure current, turn off the breadboard power supply then connect the dual meter thick red cable to the junction on the white cable connector where the negative wire of the LED is connected, i.e. the thick red cable and LED negative wire are both connected to the same port of the white cable connector.
Switch on the breadboard power supply and you should see a current reading.