EET-216 LAB # 1 - Lab Volt Measurement PDF

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Electrical Engineering Electrical Engineering Technician AMAT/ SETAS Course: EET-216 DRAWINGS & INSTALLATION 3 Name: 1. Deanne Aira Pimentel _______________________________ Name: 2. _________________________________________________________

Lab # 1 Lab-Volt Introduction Objective: In this lab, we will introduce the Lab-Volt equipment and software which will be used to perform most of the labs in this course. Equipment:  Resistor bank  Power supply  Connection leads  Data Acquisition Interface 9063(DAI)  Computer connected to DAI

Model 9063 – Data Acquisition and Control Interface The Data Acquisition and Control Interface (DACI) performs two main functions: data acquisition feeding raw signal data to the computer-based instruments, and data acquisition for implementing a control function. Each DACI can perform these two functions at the same time. However, when a complex control function is implemented, the DACI stops data acquisition for the computer-based instruments and performs only data acquisition for the control function. The DACI has four isolated, high-level voltage inputs and four isolated, high-level current inputs. All these inputs are fitted with 4 mm banana safety jacks to make connections to electric power circuits quick, safe, and easy. The DACI also has eight low-level, analog inputs which allow measurement of other circuit parameters. Two of these inputs can be used to measure torque and speed using a dynamometer (Model 8960-1 or 8960-2).

http://lvsim.labvolt.com/ 1

DACI has 4 Voltmeters and 4 Current meters as you can see the above figure. All multimeters have 2 plugs (RED and BLACK). The connection of these 2 plugs are very important. It determines the polarity of the measurements. Most of the schematics do not show the details of the connections of the meter. It is the responsibility of the technician to determine these connections. High voltages are present in this laboratory exercise. Do not make or modify any banana jack connections with the power on unless otherwise specified.

Procedures: 1. Make sure that the AC and DC power switches on the Power Supply are set to the O (off) position, then connect the Power Supply to the three-phase AC power outlet. Connect the Power Input of the Data Acquisition and Control Interface to a 24V AC power supply. Turn the 24V ac power supply on. 2. Connect the USB port of the Data Acquisition and Control Interface to a USB port of the host computer. 3. Turn the host computer on, then start the LVDAC-EMS software. In the LVDAC-EMS Start-Up window, make sure the Data Acquisition and Control Interface is detected. Select the network voltage and frequency (60Hz, 120V) then click the OK button to close the LVDAC-EMS Start-Up window. 4. Connect the equipmnet as shown in Figure 1 below. Use the Power Supply to implement the DC power source. Use the Resistive Load to implement the threesingle phase resistors 5. Make the necessary switch settings on the Resistive Load so that the resistance of the three-phase resistor is equal to ∞ Ω (all switches in the open position). 6. In the Metering window, make the required settings in order to measure the DC Line Voltage EL (input E1) and the DC Line current IL (input I1). 7. After instructor reviews your connections turn on the Power Supply 8. Complete the Table associated with Figure 1

Switch Statuses 4-on, 5-off, 6-off 4-on, 5-on, 6-off 4-on, 5-on, 6-on

Calculate Resistance 1244 Ω 416.5 Ω 172.4 Ω

E1

I1

P1

133.1 V 129.1 V 123.8 V

0.107 A 0.310 A 0.718 A

14.24 W 40.02 W 88.89 W

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1. Turn off Power supply and connect the equipmnet as shown in Figure 2 below. 2. After instructor reviews your connections turn on the Power Supply 3. Complete the Table associated with Figure 2

Switch Statuses 4-on, 5-off, 6-off 4-on, 5-on, 6-off 4-on, 5-on, 6-on

Calculate Resistance - 1275 Ω - 419.5 Ω - 173.1 Ω

E1 132.6 V 128.8 V 123.8 V

I1

P1

- 0.104 A - 0.307 A - 0.715 A

- 13.79 W - 39.54 W procedure 2 showed a - 88.52 W ower with a negative value is just a representation of opposite power direction flow from the positiv side. Hence, the change in current flow made the difference of direction of powe flow. Notably in a DC power supply, the polarities play a significant role in sign conventions.

4. Turn off Power supply. 5. Connect the equipmnet as shown in Figure 3 below. 6. In the Metering window, make the required settings in order to measure the RMS value (AC) of the resistive circuit Line Voltage EL (input E1) and the AC Line current IL (input I1).

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7. After instructor reviews your connections turn on the Power Supply. Use the Power Supply to implement the AC power source 8. Complete the Table associated with Figure 3 Switch Statuses 4-on, 5-off, 6-off 4-on, 5-on, 6-off 4-on, 5-on, 6-on

Calculate Resistance 1253 Ω 418.6 Ω 173.2 Ω

E1

I1

P1

121.5 V 121.4 V 121.4 V

0.097 A 0.290 A 0.701 A

11.79 W 35.21 W 85.10 W

9. Turn off Power supply. 10. Connect the equipmnet as shown in Figure 4 below. 11. After instructor reviews your connections turn on the Power Supply 12. Complete the Table associated with Figure 4

Switch Statuses 4-on, 5-off, 6-off 4-on, 5-on, 6-off 4-on, 5-on, 6-on

Calculate Resistance 1280 Ω 421.9 Ω 173.8 Ω

E1

I1

P1

121.6 V 121.5 V 121.5 V

0.095 A 0.288 A 0.699 A

11.55 W 34.99 W 84.93 W

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Compare the P1 of procedures 1 and 2. Explain the difference: Except from the small discrepancy of the P1 values from procedures 1 and 2, there is not much of a difference; this result is reasonable as the circuit is powered by an AC power supply. In AC circuits, the sign of power remains unchanged in both halves of a cycle, even if both current and voltage reverses direction.

13. Turn off Power supply. 14. Connect the equipmnet as shown in Figure 5 below. 15.

After instructor reviews your

connections turn on the Power Supply 16. Complete the Table associated with Figure 5 Turn on switch 1 2 3 4 5 6 7 8 9

Calculate Resistance 1214 Ω 412.1 Ω 177.8 Ω 155.3 Ω 124.3 Ω 88.94 Ω 82.87 Ω 73.00 Ω 58.70 Ω

E1 122.6 V 122.4 V 122.0 V 121.9 V 121.7 V 121.4 V 121.4 V 121.1 V 120.8 V

I1 0.101 A 0.297 A 0.686 A 0.785 A 0.979 A 1.365 A 1.465 A 1.659 A 2.058 A

P1 12.38 W 36.35 W 83.69 W 95.69 W 119.1 W 165.7 W 177.9 W 200.9 W 248.6 W

Use the data gathered in the table above to plot a Current-Power curve. Perform this step by computer and attach a clear, properly labeled printout to your lab report.

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17.Close LDVAC-EMS, then turn off all the equipment. Disconnect all the leads and

return them to their storage locations. In this exercise, you learned how to set up and connect circuits using Lab Volt equipment.

Grading Rubric Safety and Answers to Procedure Questions Marks

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Report Presentation

Conclusions

Lateness factor.

Total Mark

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