University of North Dakota
College of Engineering and Mines
School of Electrical Engineering and Computer
Science
EE 201L: Digital Electronics Lab
Section 02
Lab #1: Introduction to Multism Breadboard
Andrew Zimmerman
Introduction:
Todays lab: Introduction Multism Breadboard is designed to familiarize us with how to simulate
basic circuits, modify them and find different values across them including Current, resistance
and voltage. Using this program also helps us to understand how our physical breadboard will
behave, how to use it, and what precautions might be necessary.
Methodology and Procedure:
Components:
NI Multism is the only component however there are several simulated components in it. These
are Power source, 1k Ohm resistor, 3k Ohm resistor, wire, ground and digital multimeter.
Steps
1. We will make two circuits for this lab. The first, Circuit A, will be a loop with the Power
source on the left side, a 3k ohm resistor clockwise at the 12:00 position, a 1k Ohm
resistor in the in the 6:00 position and a ground staked between this and the 12v power
source. Add two junctions, one on each side of the 3k ohm resistor and attach multimeter,
left junction to the positive terminal, right junction to the negative terminal. Run the
simulation. Take values for voltage. Now reverse the orientation of the multimeter wires
and run again. Record values.
Circuit A
volts
First Simulation
9v
Second Simulation
-9v
SImulaton 1
Simulation 2
2. Circuit B will be much like circuit A, only with the multimeter spanning the distance
between the 3k Ohm resistor and 1k Ohm resistor. The Positive terminal of the
Multimeter will attach to the right side of the 3k Ohm and the negative to the 1k Ohm
resistor. Run Simulation and record amperage. Now flip the connection of the positive
and negative terminals of the multi meter, the negative now attached to the 3k Ohm
resistor and the positive to the 1k Ohm. Run simulation and record Amperage.
Circuit B
Current
First Simulation
3 mA
Second Simulation
-3 mA
Simulation 1
Simulation 2
Conclusion:
In addition to familiarizing myself with Multism Breadboard my understanding of D.C. circuits
improved. In both step 1 and step 2 reversal of the leads on the simulated multimeter led to a
negative value to be measured on the second simulation. This demonstrates the directional flow
of direct current. The direction of flow through the multimeter changing when probes were
reversed is why the value became negative.