-decoration: underline;">1___________����
Report Submitted by: _<span class="Normal--Char" style=" font-family: 'Arial', 'Arial';
text-decoration: underline;">Group #6__________________

Date Performed:
_<span class="Normal--Char" style=" font-family: 'Arial', 'Arial'; text-decoration: underline;
">9/8/05_____� Section:� _<span class="Normal--Char" style=" font-family: 'Arial', 'Arial';
text-decoration: underline;">02_______� Date Submitted:�
_<span class="Normal--Char" style=" font-family: 'Arial', 'Arial'; text-decoration: underline;
">9/14/05____

Instructor:�
_<span class="Normal--Char" style=" font-family: 'Arial', 'Arial'; text-decoration: underline;
">Dr. Katz_________ Course:� _<span class="Normal--Char" style=" font-family: 'Arial', 'Arial';
text-decoration: underline;">ENG-214____ Class No.:______________

INSTRUCTOR'S
EVALUATION

��������� Form������Schematic

Procedure�����Analysis

Data������Tabulated
Results

Calculations�����Conclusion

Graphs�����Days
Late

Sketches�����See
Me

Comments:
___________________________________________________________

_____________________________________________________________________

For further
information, see inside cover.

Report
Accepted���Grade: ________________

Correct
& Return���Evaluated by: ___________

Resubmission

Date Resubmitted: ______________________

Report
Accepted

Not
Accepted�����Grade: _________________

�

ENGR214 Electrical Circuits Laboratory 1

Department of Electrical/Computer Engineering

The College of New Jersey

Multi-meter Measurements

Object:� To familiarize students with the use of a digital multi-meter
for the measurement of voltage, current and resistance.� To make
students aware of the difference between precision and accuracy and
relate these parameters to multi-meter design.� To establish the
accuracy of students individual multi-meters.� To relate multi-meter
accuracy to overall measurement error.

Procedure:

Determ</span><span class="Title--Char" style=" font-size: 12pt;">ine
the accuracy and precision of your multi-meter from the manufacturer</span><span
class="Title--Char" style=" font-size: 12pt;"></span><span class="Title--Char" style=" font-size: 12pt;
">s data.


Use a voltage regulator (UA7800) to simulate a standard cell.�
Review the specifications of the regulator and then use its voltage
to determine the accuracy and precision of your multi-meter.� (Voltage regulator assemblies are available
in the stock room for your use.� Their reference voltage is marked
on their housing).


Set a variable voltage supply to approximately 8 volts.� What
is the precision of this voltage?� What is t</span><span class="Title--Char" style=" font-size: 12pt;
">he accuracy of this voltage?� What factors affect the accuracy?


Design a voltage divider to reduce the power supply voltage to 2 volts.�
Use standard resistors available from the laboratory stock room.�
(Make sure the resistor values chosen do not exceed their power rating.� The small resistors can dissipate 1/8 watt of power).


Construct the voltage divider.� Measure the resistance of the
components used to fabricate the divider.� Calculate the expected
error in the output voltage of the divider.� Does th</span><span
class="Title--Char" style=" font-size: 12pt;">e precision of the resistor
values affect this result?


Test the voltage divider.� Measure both the voltage produced
by the divider and the current drawn by the divider from the power supply.


What is the load of the multi-meter when used as a voltmeter?


How does the load of the multi-meter (voltmeter) affect the resultant voltage?�
What would be the affect of a load resistance on your voltage divider
performance?


Discuss the use of a voltage regulator as a voltage reference.�
What environmental conditio</span><span class="Title--Char" style=" font-size: 12pt;
">ns affect its stability?

�

Circuit Diagrams & Instruments Used:

The following is a circuit
diagram which depicts the voltage divider what was constructed.

Instruments & Parts:

Radio Shack 24-Range LCD Multimeter (Cat. No. 22-805)

Radio Shack prototyping breadboard

2 Alligator-to-Banana clips

Numerical
Data

Voltage data for standard
cell

Source of reading

Voltage

Voltage
Regulator

11.6821 Volts

Voltmeter reading

11.67 Volts

Voltage data for variable
power supply

Source of reading

Voltage

Variable
Power Supply

7.9 Volts

Voltmeter
reading

7.97 Volts

Data for voltage divider

Circuit Element

Voltage Across

Color Band Value

Measured Resistance

DC
Voltage Source

7.8 Volts

N/A

N/A

Resistor
1

5.70 Volts

1.5 K