_EET-117 LAB 3 21F copy Centennial College (2)

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Centennial College ELECTRICAL ENGINEERING TECHNICIAN & TECHNOLOGY Course: EET-117 Name Kugaraj Ravishangar Student Number 301184311 Date 22/08/2021 Lab #3 LABORATORY METERS AND POWER SUPPLIES Based on Experiments in Basic Circuits by David Buchla Required Components and Instruments  V.O.M. ( Analog Multi- meter)  Power supply  D.M.M (Digital Multi-meter)  alligator test leads Procedure 1. Identify Equipment and its Functions Identify equipment by observing names, models and other identification numbers. Use manuals (can be found in the equipment folder or on the Internet) to identify functions. Use standard symbols to represent equipment functions: Laboratory Instruments Instrument’s Name (1 mark) Manufacturer Model (1 mark) Functions (3 marks) All applicable equipment symbols based on functions (1 marks) Marks Triple Output DC Power Supply BK Precision 1672  Three independent outputs  Individual control knobs for voltage and current settings of variable outputs  CV (constant voltage)/CC (constant current) mode operation  Separate 3-digit voltage and current displays for variable outputs  LED indication for CV/CC mode  Overload indication LED for fixed output  Series tracking and parallel tracking mode operation to double output voltage or current respectively

Analog multimeter Simpson 260 8XI/12395Mo del 260 series 8 Multimeter is an electronic measuring instrument that combines several measurement functions in one unit. To measuring of resistance, electrical capacitance, and inductance . Analog multimeters are used to find electronic and electrical problems Digitl multimeter Keithley Model 2110 51/2 Digital multimeter is a test tool used to measure two or more electrical values Digital multimeters combine the testing capabilities of single-task meters They include several additional specialized features or advanced options. Marks: /10 2. Read the equipment manual and make a front Panel of VOM Description (5 marks): N Name Description Mark 1 Front Panel The 260-8 Volt-Ohm-Milliammeter is a large, easy-to-read 4¼ inch indicating Instrument. Below the Instrument are four controls and eight circuit jacks. 2 Range selector switch A range selector switch knob allows you to adjust the settings of the multimeter 3 Dc and Ac controlle r AC voltage Tested in items with electrical plugs. DC voltage: Tested in batteries or other items that hold a bank of electric power. Resistance: Measured in ohms. 4 Zero- ohm Adjuster zero-ohm adjuster used to calibrate the multimeter when you want to measure the resistance of an object 5 positive probes Positive probes is connected to the positive side of a battery while the negative probe of the multimeter is connected to one lead of a lightbulb. 6 Dial infinity knob Dial infinity knob allows you to adjust the pointer to the zero position of the scale Total /5

3. Read the equipment manual and make a front Panel of DMM Description (5 marks) 4. Read the equipment specifications / manual and make a front Panel of DC Power Supply Description (5 marks) N Name Description Mark 1 Display The instrument display has a primary and a secondary display area. There are additional indicators at the upper side (top) and right side of the display to show the state or the condition of an ongoing measurement. They are explained individually in the following sections. 2 Power on off Power on off button is to turn on and off the power 3 Math operation keypads Math operation keypads for use and contains a brief description of the digital multimeter. 4 Range + and range- selects the function such as voltmeter, ammeter, or ohmmeter and the range for the measurement. 5 6 Rear measurement terminals The terminal in the bottom right corner of the DMM is the common terminal (COM for short). This will be used in all measurements Total /5 N Name / Description Mark 1 Power On/Off switch to turn instrument On or Off 2 Voltage indicators display 3-digit foren 0.56” LED 3 Pull ser and pull par for voltage and current 4 Voltage and current and it used to increase the current and voltage 5 Overload and 5V fixed and its used to plug the + and – wires 6 7 Ground in the context of electronics is the reference point for all signals or a common path in an electrical cirucuit where all of the voltages can be measured form Total /5

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Marks: /15 5. Reading The Analog VOM (volt-ohm-milliammeter) Exercise

Marks: / 35 8.5V 20.9V 31V 42.5V 53V 26.5 Ω 8.1 Ω 4.3 Ω 1.9 Ω 0.6 Ω 1.7V 3.9V 6.2V 5.3V 2.6V 1.7V 4.2V 6.2V 8.5V 10.6V 8.5V 20.9V 31V 42.5V 53V 1.7V 4.2V 6.2V 8.5V 10.6V

6. Turn all the control knobs on the variable DC power supply fully counterclockwise and also make sure that the power switch is in the OFF position. 7. IMPORTANT: Use “Pointer Adjust For Zero” control on VOM to mechanically zero the Instrument. With the function switch set to an operating position (+DC, –DC, or AC volts only), and no applied input, the pointer should read zero. If it does not, use a screwdriver to turn this adjustment until it does. Once this adjustment is made, back off slightly so the pointer will rest freely over the zero mark. 8. With use of test leads connect the meters to the variable DC power supply as shown below in Figure 1 . Set the VOM to the 2.5-Volt DC range. (Note: at this range an input of exactly 2.5 Volts will result in full- scale deflection of the needle. 9. Turn your workbench DMM on: press the front-panel POWER switch to place it in the ON position. Set DMM to measure DC voltage following steps: a. Press the DCV key to measure DC voltage (ACV key is to measure AC voltage). b. Select a measurement range (auto or manual):  Autorange is the power-on default. If manual ranging is selected (MAN indicator on), press SHIFT and then ESC (AUTO) to select autorange.  For manual ranging , press the RANGE ▲ and ▼ keys to select a measurement range. c. As shown below, connect the signal to the instrument and observe the reading on the display. If the input signal exceeds the selected range, the overflow message OVLD is displayed 10. Switch on the DC power supply. Turn the left-hand CURRENT knob slightly clockwise . 11. Slowly turn the voltage knob clockwise until the VOM shows a reading of exactly 0.5 Volts. 12. Read the voltage indicated on the power supply’s own meter and record this VOLTAGE READING into T1 , column 4. ( RESULT SHEET ) 13. Read what is indicated on the DMM and also record this (3 decimal) information into T1, column 6. 14. Continue to slowly turn the voltage knob clockwise until the VOM now shows an input of exactly 1.25 Volts. 15. Again, read both the power supply’s meter and the DMM and record these measurements into T1, Column 4 and 6 . 16. Repeat Steps 11 to 12 for voltage values of: 2 Volts and 2.2 Volts. 17. Now adjust the VOM range switch to the 10-Volt DC position. 18. Continue to slowly turn the voltage knob clockwise until the VOM now shows a value of exactly 3.6 Volts. 19. Read both the power supply’s meter and the DMM and record these measurements into T1. 20. Repeat Steps 18 & 19 for voltage values of: 5.2V, 8.8V & 9.7V.. Voltage and Current Knobs FIGURE 1 Powe r suppl y meter

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21. Adjust the VOM range switch to the 50-Volt DC range. 22. Continue to slowly turn the voltage knob clockwise until the VOM now shows an input of exactly 15.5 Volts. 23. Read both the power supply’s meter and the DMM and record these measurements into T1. 24. Repeat Steps 22 & 23 for voltage values of: 15.5, 18.4, 23V & 28.5V. 25. Calculate % Error for all the readings taken from the VOM and the power supply’s display relative to the DMM’s readings (which is the most accurate & precise measurement device of the three and will be considered as the “True Value” for the sake of this experiment.) Enter the results in T1, Column 3 and 5, respectively. % Error =| True Value - Experimental Value True Value |× 100 Where: (1) “True Value” is the reading taken from the DMM. (2) “Experimental Value” is the reading taken from the VOM or Power Supply, respectively. 26. Calculate the average error values for the VOM and the power supply’s display. 27. Answer the question at the bottom of the RESULT SHEET.  Source : MT-256: Applied Electricity ©’05-‘11 - E. Bevilacqua

Table T1 %Error for VOM Power Supply Display Readings (Volts) % Error for Power Supply DMM Measurement s (Volts) Marks (2 per line, % error calc-n) RANGE (V) VOLT Column1 Column2 Column 3 Column 4 Column 5 Column6 1 2.5 0.5 30% 0.5 0 0.59 2 2.5 1.25 1.3 0.4 1.32 3 2.5 2 2.0 0 2.07 4 2.5 2.2 2.2 0 2.21 Average %Error (for 2.5V range) =1.48v 5 10 3.6 3.6 0 3.68 6 10 5.2 5.2 0 5.21 7 10 8.8 8.8 0 8.85 8 10 9.7 9.7 0 9.74 Average %Error (for 10V range) =6.82v 9 50 15.5 15.5 0 15.49 10 50 18.4 18.4 0 18.39 11 50 23.0 23.0 0 22.29 12 50 28.5 28.5 0 28.45 Average %Error (for 50V range) =21.35v Overall AVERAGE %Error = (VOM) Overall AVERAGE %Error = (Power Supply) Marks: / 26

Conclusions. The conclusion summarizes the important points of the laboratory work. You must analyze the examples to add emphasis to significant points. You must also include features and/or things you have done /benefits of a particular procedure, instrument, component, or circuit directly related to the experiment . From this assignment’s I learned how to operate the analog multimeter and digital multimeter and how to check the volts and current. When I was in high school, I did study about this analog multimeter and digital multimeter, but I didn’t study that much about this like I don’t even know how to operate the multimeters and I didn’t even know how to check the current and the volts. Finally, from Lap 3 I understand how to check and how to operate the analog multimeter and the digital multimeter and this assignment helpful for me to understand this thing. Whenever my teacher explains about this chapter I did listen to her but the same time I was trying to understand this thing by myself by operating this analog multimeter and the digital multimeter I did ask my doubt questions to my teacher now I understand everything about this Lap assignment. Marks: / 20 Rubric-Grading Criteria Max. Marks Punctuality 10 Lab Safety 20 Procedure 86 Conclusion 20 Neatness, Spelling, Grammar, and Sentence Structure 10 Total: /146

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