Experimenter:
Recorder:
Date:
Equipment Used (maker, model, and serial no. if available)

Table I
Table II
Table III
Table VII
1. Check out a DMM and Power/Probe Leads for the Power-Supply and DMM
2. Go to the side counter, collect resistors, “bread board”, and leads required to construct the circuit shown in Figure 1. Configure the Power Supply Outputs to the INDEPENDENT
mode as indicated in Figure 2.
3. Make the Measurement and Calculations needed to complete Table I, Table II, Table III,
Table IV, Table V, and Table VI.
© Bruce Mayer, PE • Chabot College • 726855827 • Page 1

Figure 1 • Connection Diagram for the Dual Voltage Supply Experimental Network. V s1
= 13V (nominal), V s2
= 5V (nominal), R1 = 1.4-2.4 k Ω, R2 = 2.9-5.1 kΩ, R3 = 6.5-8.8 k
Ω, R4 = 9.5-16 kΩ, RL = 2.6-3.6 kΩ (3.3 kΩ nominal)
© Bruce Mayer, PE • Chabot College • 726855827 • Page 2

V s1
= 13.0
OUT
V s1
- +
13V
V s2
= 5.0
V s2
- +
5V
OUT
Figure 2 - Connection Diagram for the Dual Voltage Supplies used to Power the
Experimental Network of Figure 1. Set V s1
to 13V (nominal), V s2
to 5V (nominal).
Table I – Component Actual-Values by DMM Measurement
V s1
=
V s2
=
R1 =
R2 =
R3 =
R4 =
RL =
© Bruce Mayer, PE • Chabot College • 726855827 • Page 3

Table II – Node Voltages: Calculations & DMM-Measurements
Value
Determination
V
1
V
2
V
L
Calculated
Measured

%

Calculate Node Voltages using the component actual-values from Table I
 
%
J
= 100x(V
J,calc
– V
J,measc
)/V
J,meas
Table III
– Branch Currents: Calculations & DMM-Measurements
Value
Determin.
I
1
I
2
I
3
I
4
I s1
I s2
I
Calculated
Measured

%

Calculate Branch Currents using the component actual-values from Table I
 
%
J
= 100x(I
J,calc
– I
J,meas
)/I
J,meas
Table IV
– Power Absorbed by Voltage Supplies: Component and VI Calculations
Value
Calculations
P
Vs1
P
Vs2
ΣP
Vsj
L
Component: Calc1
Measured VI: Calc2

%

For ALL power calculations assume that the PASSIVE Sign convention relates component voltage-polarities and current-directions

Calculation-1: Use the component actual-values from Table I

Calculation-2: Use the measured values of V-across from Table II, and I-thru from Table III
for the two supplies.
 
%
J
= 100x(P
J,calc
– P
J,meas
)/P
J,meas
© Bruce Mayer, PE • Chabot College • 726855827 • Page 4

Table V – Power Absorbed by Resistors: Component and VI Calculations
Value
Calcs
P
R1
P
R2
P
R3
P
R4
P
RL
ΣP
Rj
Component:
Calc1
Measured
VI: Calc2

%

For ALL power calculations assume that the PASSIVE Sign convention relates component voltage-polarities and current-directions

Calculation-1: Use the component actual-values from Table I

Calculation-2: Use the measured values of V-across, and I-thru for the two supplies from
Table II and Table III
 
%
J
= 100x(P
J,calc
– P
J,meas
)/P
J,meas
Table VI
– Power Balance
Value
Calculations
ΣP
Vsj
ΣP
Rj
% Out of Balance, Δ
OB
%
Component: Calc1
Measured VI: Calc2

Calculation-1: Use the component-calculations from Table IV and Table V

Calculation-2: Use the measured VI calculations from Table IV and Table V
 
OB
% by this Equation:

OB
%



P
Vsj
P
Vsj




P
Rj
P
Rj
© Bruce Mayer, PE • Chabot College • 726855827 • Page 5

4. Remove the Load Resistor, RL, from the circuit to leave OPEN that branch of the circuit as shown in Figure 3.
5. Make the measurements and calculations need to complete Table VII
Figure 3 • Connection Diagram for the Thevenin Equivalent Circuit. Use the Same
Supply-Voltages and Resistor-Values as used to make previous measurements.
© Bruce Mayer, PE • Chabot College • 726855827 • Page 6

Table VII – Thevenin Component Determination
Value Quantity, and Determination-Method
= Voc By DMM Measurment
= Isc By DMM Measurment
 Hint: The DMM itself acts as the Short Circuit
= R
TH,VI
= Voc/Isc
 Use DMM Measured Voc and Isc
= R
TH,SD
by Source Deactivation
 DeActivate the Voltage Sources by REMOVING them from the Ckt, and REPLACING them with a wire

Measure using the DMM the resulting Resistance as seen from the
Voc terminals
= R
TH,avg
= [R
TH,VI
+ R
TH,SD
]/2
6. In the Space Below Neatly Draw the THEVENIN Equivalent for the Circuit shown in Figure
1 with the Load Resistor REATTACHED. Use R
TH,avg
from Table VII.
7. For the Thevenin Equivalent Circuit calculate the Load Current, IL, and mark its magnitude and direction on the circuit Diagram.
© Bruce Mayer, PE • Chabot College • 726855827 • Page 7

8. In the Space Below Neatly Draw the NORTON Equivalent for the Circuit shown in Figure 3 with the Load Resistor REATTACHED. Use R
TH,avg
from Table VII.
9. For the NORTON Equivalent Circuit calculate the Load Current, IL, and mark its magnitude and direction on the circuit Diagram.
10. Return all lab hardware to the “as-found” condition
11. QUESTION : How does IL by the Thevenin and Norton Equivalents compare to the DMM-
Measured value from Table III?
© Bruce Mayer, PE • Chabot College • 726855827 • Page 8

Print Date/Time = 11-Apr-20/12:30
© Bruce Mayer, PE • Chabot College • 726855827 • Page 9