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

Problem Statement

 * Figure out how many ohm resistor for voltmeter.
 * Get the answer in the class.
 * Test the converted ammeter.

The Design Process

 * Use R=V/I get, get the voltmeter's resistor is 10K and shunt resistor is 0.3 ohm.
 * Shunt resistor should be parallel with voltmeter to reduce the voltmeter's resistor.
 * The resistor in the circuit series with converted ammeter is 10K.
 * Here is the diagram I draw.

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.

Operations

 * solder 1k resistor off.


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

Maintainability, reliability, 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.

Next Steps

 * Meter is broken, get a new meter.
 * Test converted ammeter in the circuit.
 * Connect ammeter to the power supply.
 * Do tutorial for this project.