Engineering 103 –UMass Boston

Home work 4

Please write the due date here ________________________

This homework is entirely about LabVIEW. There are three problems in this set. To receive credits you should submit the printouts of LabVIEW Front Panels and Block Diagrams. In each of these files, (i) your name AND date should be shown as LabVIEW text boxes; (ii) Data entered into the “numeric control” inputs AND results shown in the “numeric indicator” outputs. (iii) choose ‘Operate/Save current values as default’ before you save your files to be submitted.

1) You are required to build a VI that outputs Is (A), V1 (V), I1 (A), and I2 (A), as shown in the figure below. The inputs are V (V), and R1 to R4 (Ohm).

You will turn in a file and a print-out of the front panel and block diagram with your name inside each (not hand-written), the print-out should show the outputs for the following inputs: V=12V; R1=3 Ohm; R2=3 Ohm; R3=3 Ohm; R4=3 Ohm,

The equations to use are (they are obtained from Circuit Analysis using series and parallel equivalent combinations of resistors):

a) Rs=R3+R4;

Rt=R2 || Rs=R2*Rs/(R2+Rs);

R=Rt+R1

b) Is=V/R

c) V1=V-R1*Is

I1=V1/R2

I2=V1/Rs

2) You are required to make a VI that outputs I1 (A), V2 (V), V4 (V), and V6 (V) as shown in the figure below. The inputs are V (V), and R1 through R6 (Ohm). You will turn in a file and a print-out of the front panel and block diagram with your name inside each (not hand-written), the print-out should show the outputs for the following inputs: V=12V; R1 through R6 = 4 (Ohm) each.

The equations to use are (they are obtained from Circuit Analysis using series and parallel equivalent combinations of resistors):

(1)

(2)

                                                                                        (3)

                                              (4)

3) You are to create two sub VI: one called parallel.vi and one called Vnext.vi (see link Circuit Analysis w/ LabVIEW IV from the course e-syllabus), then save them in a library. In the same library you will rewrite the VI made in problem 2 but now using the newly created sub VI. You can call your subVI from the block diagram by right click, then click on “VI libraries”, then browse your library to find the desired subVI. You will turn in a file and a print-out of the front panel and block diagram with your name inside each (not hand-written), the print-out should show the outputs for the following inputs: V=12V; R1 through R6 = 4 (Ohm) each.