9. Output Devices¶
This week we had to:
- Measure the power consumption of the output device.
To measure power consumption we will use 3 methods:
- DC power supply
- multimeter
- a diagram created by Onik Babajanyan (which we will tell you more about a little later)
Power supply¶
Power supply is a universal tool to generate DC power (DC stands for direct current), set current limits, tresholds and measure power consumtion for projects that require no more than 30 Volts and 3Amps max. The Power supply we have is: Instek GPD-3303D it has 2 controlled channels 0-30V and one fixed with tis options 2.5V/3.3V/5V/3A. We mainly use the controlled channels.
At the back of the device we have the input voltage options:
As you can see we use 220V that’s our countries standard voltage.
We are going to measure power consumtion of several DC motors and a led strip.
We need to connect DC motor to power supply the polarity doesn’t matter since the only difference is the direction of rotation.
Multimeter¶
When working with a multimeter, there are two options for connecting wires. Since when measuring voltage or resistance you need to connect probes parralel to the pins and in case of current, you need to connect the device in series, so usually the red cable must be switched into the appropriate slot. The black probe or the (-) always goes to the “COM” slot.
The red one goes to different ones depending what we are measuring.
Connecting the motor to the Power supply¶
As part of a group assignment, we looked at a small DC motor designed for 12 Volts:
We connected the motor to the Power supply, giving a charge of 5 Volts and 0.5 Amps.
The motor was spinning, and the energy consumption was 5 Volts and 40 miAmps.
