EENG 4302 / 5302

Instrumentation and Measurement Systems

David M. Beams

University of Texas at Tyler

 

Homework Assignments

 

Updated Aug. 2, 2005

 

Numbers with decimal points (e.g., 2.9) refer to problems from the course text.  Numbers in parentheses give the point value for the problem.

 

 

  • Homework #2      due June 8, 2005      1.1 (10)  1.5 (10)  1.7 (20)  1.8 (20)  1.12 (20)

           

  • Homework #3      due June 22, 2005    2.2 (25)  2.4 (20)  2.5 (20)  2.9 (25)

 

In-class assignment (10)

An aluminum beam has a length of 11.5 in, a width of 1.0 in, and a thickness of 0.0625 in.  It is clamped at one end and left free at the other to form an end-supported (cantilever) beam.  A 120W metal-foil strain gage is bonded to the beam at 1.5 in from the clamped end of the cantilever.  The strain gage has a gage factor of 2.095 and the aluminum has a modulus of elasticity (Young’s modulus) of 68.9 GPa.  What will be the change in resistance in the strain gage if a mass of 250g is suspended from the free end of the cantilever?

 

 

  • Homework #5 Problems   4.2 (15)  4.3 (10)  4.6  (15)  due July 18, 2005
  • Homework #5 Project GUISE assignment (ac-excited strain gage Wheatstone bridge)  25 points  due July 13, 2005
  • Homework #5 Project GUISE assignment (phase-sensitive demodulation)  25 points  due July 18, 2005

 

Other assignments:  transfer function of an active single-pole phase shifter, determination of the potential of a sphere the size of the Earth carrying a net charge of 1 C (5 points each)

 

  • Homework #6 Problems:  5.1  (10)  5.3 (15)  5.7 (15);

You will need the slew rate for the CA3140 for 5.3.  You can find it from the data sheet available at http://www.intersil.com/data/fn/fn957.pdf.

 

  • Demonstrate mathematically why a carrier amplifier (a switching-type phase-sensitive demodulator switching at a frequency ws followed by a low-pass filter of bandwidth wc) will reject interfering signals outside the range ws +/- wc.  (10)