From Wikiversity
Jump to navigation Jump to search

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.
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.