Lab 2 - Measuring Voltage, Current & Resistance

Prelab (Do this before you come to lab)

• If you haven’t already, get the MyDAQ and Multisim running on your computer Labs: Installing Multisim & My Daq
• Review the Instructions and Reference Material below, especially Solution to the Resistor network problem: prob2-m2.3s.pdf Download prob2-m2.3s.pdf
• (Optional) You will be faster if you do the circuit calculations and Multisim simulations before you come to lab.  IF you do not have Multisim running on your PC yet, then just do the calculations, and do the Multisim on the lab computers.
• Obtain the equipment and parts. You can purchase parts at the ECE Stockroom MEB 2355 with your U-card.  Total cost of parts is around $30 this semester.

Instructions & Reference Material:

• Remember from Lab 1:  To get your MyDAQ started, look for the NI Instrument Launcher on your computer (you may want to use the 'search' box to do this easily).
• MyDAQ Quick Reference Guide (especially need section F.7 to make a variable voltage) Labs: My Daq Resources
• MyDAQ as voltmeterhttp://www.youtube.com/watch?v=AiKZfQPI5Sw Links to an external site.
• MyDAQ measuring voltage through shunt resistor , then calculate current from Ohm's Law http://www.youtube.com/watch?v=V6Fv79uVrcw
• Review from Lab 1 if needed:  MyDAQ measuring resistancehttp://www.youtube.com/watch?v=nE6123mquhI Links to an external site.

• Multisim files:

  • For Resistor network: Lab2Expt2Multisim.ms13 Download Lab2Expt2Multisim.ms13
  • For Resistance indicator: Lab2Expt4Multisim.ms13 Download Lab2Expt4Multisim.ms13
  • Multisim demos : See DVD in back of your book.

• Help with Lab 2 Part 3 Derivations: 
  

In the lab, you are asked to verify that certain pre-selected resistors will meet the requirements for the circuit. You can either do this by calculating them by hand (see derivation and associated matlab file below), or you can use the multisim files (above) to verify the performance of the circuit (you may have to raise the power level of the resistors to 1/4 W). 
R sensor with 3 Rs.pdf Download R sensor with 3 Rs.pdf

  (derivation)

Lab2_LED_resistors.m Download Lab2_LED_resistors.m  (Matlab file)

• Data Sheets:

Light Emitting Diodes (LED)

http://www.electronics-tutorials.ws/diode/diode_8

LED tutorial (especially see the picture of how the diode is built inside the red plastic dome, and what the 'flat edge' means http://en.wikipedia.org/wiki/Led Links to an external site.

LED Specs (abbreviated) http://www.electronics-tutorials.ws/diode/diode_8.html

• Solution to the Resistor network problem: prob2-m2.3s.pdf Download prob2-m2.3s.pdf
• Resistor network calculations by hand
• Lab2RnetSoln.pdf Download Lab2RnetSoln.pdf
• (and solved with Matlab)  Lab2RnetCalc.m Download Lab2RnetCalc.m

What is Due When ? Answer the questions in the handout for Lab 2.  This is due at the start of your NEXT lab (lab 3).  OK to hand in either in hard copy to you TA or the Lab homework return box or electronically.