Download 103_lab02

ELEC 103
LABORATORY EXERCISE 2
VOLTAGE MEASUREMENTS
PURPOSE OF EXPERIMENT
To familiarize the user with the DC voltmeter scales and ranges of a general purpose multimeter such
as the Simpson, Model 260 multimeter.
EQUIPMENT LIST
2  6 Volt Dry cell batteries
2  1.5 Volt Dry cell batteries
1  Simpson, Model 260 multimeter
1  1000 1 watt resistor
PROCEDURE
1. Move the meter STATUS/POLARITY switch to the +DC
position. Move the RANGE SWITCH to the 10 Volt
range position. Check the meter leads to be certain they
are plugged into the correct receptacles. The black lead
should be plugged into the minus/common receptacle and
the red lead should be plugged into the plus receptacle.
2. Connect the negative lead (black lead) of the voltmeter to
the negative (minus) post on one of the 6 Volt batteries.
Connect the positive lead (red lead) of the voltmeter to the
positive (plus) post on the same 6 Volt battery. The meter
pointer should have moved up the scale (to the right). If the
meter pointer moved to the left, you must immediately
disconnect the meter and return to step 1 and start the
experiment again.
3. Read the meter and record the voltage in the appropriate
place on the datasheet supplied with this experiment.
4. Without disconnecting the meter from the circuit, move the
RANGE SWITCH to the 50 Volt range. Read the meter and record the voltage in the appropriate
place on the datasheet.
5. Without disconnecting the meter from the circuit, move the RANGE SWITCH to the 250 Volt
range. Read the meter and record the voltage in the appropriate place on the datasheet.
6. Repeat step 2 through step 5 for the other 6 Volt battery and record the voltage measurements in
the appropriate place on the datasheet.
7. Using one of the test leads to connect the batteries
together, connect the plus (+) terminal of one of the 6
Volt batteries to the negative () terminal of the other 6
Volt battery. This is a SERIES AIDING
CONNECTION. Draw the fully labeled schematic, with
appropriate electrical symbols, including the voltmeter,
Figure 21
on the datasheet. Refer to the schematic in Figure 21
for some hints in drawing the schematic.
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ELEC 103
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LABORATORY EXERCISE 2
VOLTAGE MEASUREMENTS
Move the RANGE/FUNCTION SWITCH to an appropriate range to measure the batteries when
they are connected as described in step 7. Observe correct polarity when connecting the
Voltmeter to the unused terminals of the 6 Volt batteries. Record the measured voltage on the
datasheet.
Measure the voltage of a 1.5 Volt battery using the correct RANGE SWITCH position. Record
the voltage on the datasheet.
Connect the negative terminal of the 1.5 Volt battery to the positive terminal of one of the 6 Volt
batteries. Again, as in step seven, this is called a SERIES AIDING CONNECTION. The battery
voltages add in a series aiding connection. Select the appropriate meter range and measure the
voltage across the two batteries. Draw a schematic of the circuit, including the voltmeter, in the
space provided on the datasheet. Also, record the measured voltage.
Connect the positive terminal of one 6 Volt battery to the positive terminal of a 1.5 Volt battery.
Draw the fully labeled schematic, including the voltmeter, in the space provided on the data
sheet. This is called a SERIES OPPOSING CONNECTION.
Measure the voltage across the two batteries using the correct RANGE SWITCH position.
Record the measured voltage on the data sheet.
Using test leads, connect a series combination of a 1.5 Volt battery, a 6 Volt battery and a 1000
 resistor with the voltmeter across the resistor, as shown in Figure 21. Draw a schematic of the
circuit. Record the measured voltage on the data sheet.
Reverse the test leads to the 6 Volt battery in the circuit shown in Figure 21. Connect the meter
to the circuit with the same polarity shown in Figure 21. However, before making the
measurement, move the STATUS/POLARITY SWITCH to minus DC. Draw a schematic of the
circuit. Record the measured voltage on the data sheet.
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ELEC 103
LABORATORY EXERCISE 2
VOLTAGE MEASUREMENTS
DATASHEET FOR EXPERIMENT 2
STEPS 3  6: Six Volt Battery Voltage Readings.
Battery #1
Battery #2
6 Volt battery using the 10 Volt Range
_________
_________
6 Volt battery using the 50 Volt Range
_________
_________
6 Volt battery using the 250 Volt Range
_________
_________
STEP 7:
Step 8:
Schematic  Two Batteries Connected in SERIES AIDING.
Series Aiding Voltage Measurement.
Voltage = _____________ Range = _____________
Step 9:
1.5 Volt Battery Measurement.
Voltage = _____________ Range = _____________
STEP 10:
Schematic  Two Batteries Connected in SERIES AIDING.
Voltage = __________
Range = __________
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ELEC 103
LABORATORY EXERCISE 2
VOLTAGE MEASUREMENTS
STEP 11:
Schematic  Two Batteries Connected in SERIES OPPOSING.
Step 12:
Series Opposing Voltage Measurement.
Voltage = _____________ Range = _____________
STEP 13:
Schematic  Series Aiding Sources series circuit.
Voltage = _________
Range = _________
STEP 14:
Schematic  Series Opposing Sources series circuit.
Voltage = __________
Range = _________
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