ECET110L LABORATORY #2

Fill in all the voltage values in TABLE 1 with reference to FIG.1.

TABLE 1 is meant to provide the voltage values that would be expected between the nodes in the circuit of FIG. 1 assuming that all its components have the nominal values shown in the schematic diagram and that they are electrically attached to the terminals. The TABLE can then be used as a reference in the troubleshooting exercises that follow.

TABLE 1

Voltage / With Switch S1
OPEN / CLOSED
VAB
VBC
VCD
VEA
VED
VAD
VBE
VBD
VEC

The following exercises assume that some voltages are measured and the values obtained are different from the ones calculated in TABLE 1. You must guess what possible faults in the circuit would result in such deviations from the expected values. Demonstrate that your guesses are correct by simulating the fault on the breadboard and measuring the deviated voltages.

  1. If VBD= -28V and VCD= 0V when S1is CLOSED in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VAD= -28V and VDC= 5V when S1is CLOSED in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VBC= -28V and VCD= 0V when S1is CLOSED in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VEC= -10V when the switch is OPEN and VBC= 0V when S1is CLOSED in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VEC= -10V and VBA= 10V when the switch is OPEN in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VBE= 18V with the switch CLOSED and VBE= -10V when the switch is OPEN in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VEC= -18V and VDA= 28V with the switch OPEN and VDC= 18V when the switch is OPEN in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VEC= 0V with the switch OPEN and VDC= 6.43V when the switch is CLOSED in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VDB= 28V and VCB= 10V with the switch CLOSED or the switch OPEN in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VDC= 18V with the switch OPEN and VCB= 10V with the switch CLOSED in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VDC= 28V with the switch CLOSED in the circuit of FIG. 1 then the possible circuit fault(s) is (are):
  1. If VDA= 28V, VCE = 10V, and VAB= 0V with the switch CLOSED or the switch OPEN in the circuit of FIG. 1 then the possible circuit fault(s) is (are):

LAB_2_-_Troubleshooting_Series_Circuits.doc Rev 22/12/2008 4:48:00 PM J. Leizerowicz - Dec-08 Page 1