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Problem Statement[edit | edit source]
- 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[edit | edit source]
- 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[edit | edit source]
The initial design[edit | edit source]
- 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.
- The current overloaded will cause meter broken.
Final Design[edit | edit source]
- 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.
- Connect another 10k resistor in series with converted ammeter.
- Connect the alligator jumpers with 3amp power supply, then turn on.
Work flow[edit | edit source]
- solder 1k resistor off.
- Solder 10k resistor on.
- Make 2 wires.
- Solder 2 wires with 0.3ohm power resistor.
- Connect 0.3ohm power resistor to voltmeter.
- Connect converted ammeter to the circuit.
- Here is my youtube video test converted ammeter
- Turn on the 3amp power supply.
Hardware/software function and safety[edit | edit source]
- 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.
Test and analysis procedures (hardware vs. software, acceptance vs. qualification)[edit | edit source]
- Turn on the 3amp power supply. If the needle flip to the middle, the converted ammeter is working.
Poster[edit | edit source]
Next Steps[edit | edit source]
- Get a new voltmeter.
- Follow the Work Flow.