 Institute Of Applied Technology ATE 1012 Grade 10 Eng. Rose Hasan.

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Institute Of Applied Technology ATE 1012 Grade 10 Eng. Rose Hasan

 Be familiar with the usage of Multi-meters, Oscilloscopes and Function Generators  Perform Measurements of electrical quantities using measuring instruments  Test diodes and connectivity Eng. Rose Hasan

 Introduction  Multimeter  Voltage Measurement  Current Measurement  Resistance Measurement  Diode Testing  Continuity Test  Function Generator  Oscilloscope  Practical Tasks Eng. Rose Hasan

 Measuring and Test Equipment are used to:  measure electrical quantities  test electrical components  generate different types of signals to test the response of the circuit to that signal.  Measuring and test equipment can be used to:  troubleshoot electrical problems in many industrial and household devices such as batteries, lamps, motor controls and wiring systems Eng. Rose Hasan

 Purpose: A multi-meter is an electronic measuring instrument that combines several functions in one unit. It is used to:  measure voltage, current and resistance and to test diodes and connectivity Eng. Rose Hasan

 Types: There are two types of multimeters:  analog & digital Eng. Rose Hasan

 Voltage Measurement (Voltmeter): To measure the DC voltage across electrical components in a circuit, follow these steps:  Select on the digital multi-meter's setting switch on the largest voltage range.  Connect the positive (RED) (+) lead to the part of the circuit that is connected to the positive (+) side of the supply (battery). Eng. Rose Hasan

 Connect the negative (BLACK) (-) lead to the part of the circuit that is connected to the negative (-) side of the supply (battery).  Switch on the multi-meter by pressing "POWER" button. Then select the best range that will give you the most accurate results.  Record the reading and the unit that are displayed in the multimeter's display. Eng. Rose Hasan http://serc.carleton.edu/sp/compadre/interactive/examples/19095.ht ml http://www.physics-chemistry-interactive-flash- animation.com/electricity_electromagnetism_interactive/multimete r.htm

 Items Required: Eng. Rose Hasan

 Measure the voltage across the batteries using a multi-meter: Eng. Rose Hasan

 Record your readings on the following table. The true value is the value written on the battery Eng. Rose Hasan

 3. Compare the measured value with the true value of the voltage written in the battery. Is the measured value close to the real value? If no, state why?  ______________________________________  4. You can test a battery using Multi-meter by:  (a) Voltage measurement  (b) Connectivity test  (c) Diode Test Eng. Rose Hasan

 Current Measurements : To measure the DC current flowing in electrical circuit, follow these steps:  Plug the BLACK (-) probe into the COM input jack and the RED (+) probe into the mA or A input jack.  Adjust the digital multi-meter for current measurements.  Switch off the power in the circuit. Eng. Rose Hasan

 Break the circuit between elements where the current to be measured.  Insert the probes of the multi-meter in the place where do you break the circuit.  Switch on the multi-meter.  Select the best range that will give you the most accurate results.  Record the reading and the unit that are displayed in the multi-meter's display Eng. Rose Hasan

 Resistance Measurements (Ohmmeter): To measure the resistance of a resistor, follow these steps:  Turn Off the power to the circuit and remove the components to be tested.  Select on the digital multi-meter's setting switch on the lowest resistance range. Eng. Rose Hasan

 Plug the BLACK (-) probe into the COM input jack and the RED (+) probe into the Ώ input jack.  Connect the probe tips across the component you want to measure its resistance  Switch on the multi-meter and select the best range that will give you the most accurate results.  Record the reading and the unit that are displayed in the multimeter's display. Eng. Rose Hasan

 Items Required: Eng. Rose Hasan

 Measure the resistance across different resistors using a multimeter and color code Eng. Rose Hasan

 2. Record your readings on the following table Eng. Rose Hasan

 3. Compare the value of resistance measured by the multi-meter and color code. Are the values close to each other?  -------------------------------------------------------- -------------------------------------------------------- Eng. Rose Hasan

 Items Required:  Resistors (200Ώ), multi-meters  Electricity & Electronics Constructor, EEC470  Basic Electricity and Electronics Kit EEC471-2  Power supply unit Eng. Rose Hasan

 Construct the simple circuit shown below. Use 200 Ώ resistor values. Eng. Rose Hasan

 Connect the multi-meter to the power supply.  Make sure that the variable dc control knob is fully counter clockwise, and then switch on the power supply.  Increase the applied voltage in 2 V steps from 0 V up to 5 V. Eng. Rose Hasan

 At each step measure the current flowing in the resistor. Record your reading in the following table: Eng. Rose Hasan

 To measure the resistance of a resistor, follow these steps:  Turn Off the power to the circuit and remove the components to be tested.  Select on the digital multi-meter's setting switch on the lowest resistance range.  Plug the BLACK (-) probe into the COM input jack and the RED (+) probe into the Ώ input jack. Eng. Rose Hasan

 Connect the probe tips across the component you want to measure its resistance  Switch on the multi-meter and select the best range that will give you the most accurate results.  Record the reading and the unit that are displayed in the multimeter's display. Eng. Rose Hasan

 To test if the diode is functioning or not, follow these steps:  Adjust the digital Multi-meter for diode-testing.  Connect the positive lead (Red) (+) to the anode (A(+)) and connect the negative lead (BLACK) (-) to the cathode (K(-))  Switch on the multi-meter. For a diode in a good condition the reading will be ≤ 300 mV for Ge diode and ≤ 700 mV for Si diode. Eng. Rose Hasan

 Now connect the (RED) (+) lead to the (K(-)) and (BLACK) (-) lead to the (A(+))  For a diode in a good condition the reading will be for both types. Eng. Rose Hasan

 To test if two points are electrically connected, follow these steps:  Turn Off the power to the circuit  Adjust the digital Multi-meter for continuity- testing and Switch on the multi-meter.  When the probes aren't touching, the display shows "1“. Eng. Rose Hasan

 When you touch the tips of the probes together, the display changes to a three digit mode. The multi-meter will also emit a beep. Eng. Rose Hasan

 http://www.wisc- online.com/objects/ViewObject.aspx?ID=AM T2104 Eng. Rose Hasan

 Purpose: Function generator is used to produce different waveform such as:  Sine  Square  Triangular Eng. Rose Hasan

 It is used to test and examine the response of an electrical circuit to that signal.  (i.e. the motor response to a square or triangular signal). Eng. Rose Hasan

 Main Control Keys: The function generator has many control keys to control the:  waveform shape  amplitude  Frequency  http://www.physics-chemistry-interactive- flash- animation.com/electricity_interactive.htm Eng. Rose Hasan

 The following table shows function generator main keys and their usage. Eng. Rose Hasan

 Purpose: Oscilloscope is a device that is used to display different waveforms simultaneously  (i.e the input and output of an amplifier). Eng. Rose Hasan

 Main Control Keys: Oscilloscope has many control keys to scale the:  amplitude  periods of the displayed waveform. Eng. Rose Hasan

 The following table shows some oscilloscope main keys and their usage. Eng. Rose Hasan

 Items Required:  Function Generator  Oscilloscope  speaker Eng. Rose Hasan

Oscilloscope

Eng. Rose Hasan

http://physics-zone.com/lab_oscfunctiongen.html Oscilloscope Lab Worksheet Eng. Rose Hasan

1. Connect the function generator and oscilloscope as shown below. Eng. Rose Hasan

2. Set the function generator to give 5v pk and 1 kHz. 3. Select channel A on the oscilloscope. Set the volt/division scale to 5v and time/division to 250 us (μs). 4. Amplitude Measurement: measure the pk-pk voltage of the waveform as seen in the following: Eng. Rose Hasan

 Volt/division scale = -----------------------------  No. of divisions = -----------------------------  Pk-Pk voltage = ----------------------------- 5. Period Measurements: measure the period of the waveforms seen in figure Eng. Rose Hasan

 Time/division scale = -----------------------------  No. of divisions = -----------------------------  T (Period) = ----------------------------- Eng. Rose Hasan

 Be prepared for a Quiz next Class in module #4.  Do Homeworks 1 & 2 (From my Wiki).  Next Class: Start with Module #5 Eng. Rose Hasan