Implement2

Problem Statement

• Figure out how many ohm resistor for voltmeter.
• Figure out the shunt resistor.
• How to parallel shunt resistor with voltmeter.
• Test the converted ammeter.

Lists, Source, Cost, Consumable

• One voltmeter, one 3amp power supply, one 0.3 ohm, one 1 ohm resistor, two 10k resistors, one bread board, three alligator jumpers, two wires.
• These sources are from School supply.

Designing the Implementation Process

The initial design

• Found this useful pdf file Conversion of voltmeter to ammeter
• Replaced 1M voltmeter's resistor with 1 ohm resistor.
• Tested the converted ammeter, the needle flip to another side of voltmeter.
  • Because the voltmeter's resistor is too small, and the voltmeter is in series connection.

• 
  Testing converted ammeter

• The current overloaded will cause meter broken.

Final Design

• Keep following this pdf file Conversion of voltmeter to ammeter
• Replace 1k resistor with 10k resistor.
• Connect 0.3ohm power resistor in parallel with 2 poles of voltmeter on the back.

• 
  Converted ammeter

• Connect another 10k resistor in series with converted ammeter.
• Connect the alligator jumpers with 3amp power supply, then turn on.

Work flow

• solder 1k resistor off.

• 
  solder off this resistor

• Solder 10k resistor on.

• 
  1k resistor

• Make 2 wires.

• 
  cut a piece of wire
• 
  pull 2 wires out
• 
  get 2 wires

• Solder 2 wires with 0.3ohm power resistor.

• 
  2 wires connect to 0.3 power resistor
• 
  2 wires connect to 0.3 power resistor
• 
  2 wires connect to 0.3 power resistor
• 
  2 wires connect to 0.3 power resistor

• Connect 0.3ohm power resistor to voltmeter.

• 
  convert voltmeter to ammeter
• 
  convert voltmeter to ammeter

• Connect converted ammeter to the circuit.

• 
  connect meter to the circuit.

• Here is my youtube video test converted ammeter
• Turn on the 3amp power supply.

Hardware/software function and safety

• The resistor may get burn up and melt when test a couple times.
• Keep alert. When smell something burning check around.
• This resistor get burn and melt.

• 
  resistor get burn up

Test and analysis procedures (hardware vs. software, acceptance vs. qualification)

• Turn on the 3amp power supply. If the needle flip to the middle, the converted ammeter is working.

Next Steps

• Get a new voltmeter.
• Follow the Work Flow.