User:Shengtaoliu/ENES-100/project 1/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.

The initial design

 * 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

 * 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

 * solder 1k resistor off.


 * 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.

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

 * Meter is broken, get a new meter.
 * Test converted ammeter in the circuit.