ECT343_Unit_1_Lab_Procedure

Spring 2017 Instructor: E. L. Wittenmyer ECT343 : Unit 1 Lab [20 points] Due Date: Feb . 3rd by 11:59am For this lab, you will use Lab exercise 1 -1, Procedure 1 and Procedure 2, Bell text page 29 /30 . However, the procedures are designed around the use of hardware function generators and scope s. Using Multisim, in some cases, gives different results. The digital nature of Multisim eliminates some response characteristics we find in hardware circuits. Thus , use this revised procedure. Lab documents submitted to T URNITIN link must be in MS Word file. Procedure 1 1-1 & 1 -2. Display the square wave output of a function generator on an oscilloscope. Use DC coupling on the scope and set the output for 1V peak -to-peak at 1KHz. Measure the rise and fall times (t r and t f). Note that t r will equal t f in Multisim (digital simulation precision). Furnish a screen shot of the circ uit and the scope waveshape of tr. You will have to adjust the timeb ase on the scope down into the u sec (microsecond or nanosecond ) range. 1-3. Switch the scope to ac coupling. In sert the RC network as shown. Use a polarized capacitor. This simulates the RC -frequency characteristics of hardware scope probes and scope circuits. The RC as pects of the hardware ca uses tilt. Now reduce the frequency of the square wave until you observ e approximately 10% tilt. Note that you will probably be in the single digit Hz values. Furnish a screen shot of the 10% tilt along with the function generator settings. 1-4. If you were working with hardware devices, the triangle and sine wave functions on the signal generator has amplitude and frequency limits. No so in Multisim, so skip this step – nothing to do for 1 -4. Spring 2017 Instructor: E. L. Wittenmyer Procedure 2 2-1. Retaining the circuit from 1 -3, n ow reconfigure for a 1V positive pulse (not a squ are wave) running at 1K Hz. Hint: what is the difference between a square wave and a pulse? On this signal generator, adjusting away from 50% will make a pulse! Show a pulse waveshape on a screen shot. 2-2. Now reduce the duty cycle to 1% and show a screen shot. Ditto for 99% That’s it for this lab!