ELEC 103 LABORATORY EXERCISE 2 VOLTAGE MEASUREMENTS Page 1 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 − 1000Ω, 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, on the datasheet. Refer to the schematic in Figure 2−1 for some hints in drawing the schematic. Figure 2−1ELEC 103 LABORATORY EXERCISE 2 VOLTAGE MEASUREMENTS Page 2 8. 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. 9. Measure the voltage of a 1.5 Volt battery using the correct RANGE SWITCH position. Record the voltage on the datasheet. 10. 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. 11. 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. 12. Measure the voltage across the two batteries using the correct RANGE SWITCH position. Record the measured voltage on the data sheet. 13. Using test leads, connect a series combination of a 1.5 Volt battery, a 6 Volt battery and a 1000 Ω 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. 14. 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.ELEC 103 LABORATORY EXERCISE 2 VOLTAGE MEASUREMENTS Page 3DATASHEET 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: Schematic − Two Batteries Connected in SERIES AIDING. Step 8: 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 = __________ELEC 103 LABORATORY EXERCISE 2 VOLTAGE MEASUREMENTS Page 4STEP 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 =