00325nam a2200109 a 450000500170000002000150001708200240003210000440005624500640010026000310016430000200019520251203091902.0  a8120307526  a621.381043,bD, hel  aHelfrick, Albert D., Cooper, William D.  aModern electronic instumentation and measurement techniques  aDelhibPrentice-Hallc1994  axii, 446p, 24cm