Exercise 1: AC Waveform Generator Familiarization

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1 Exercise 1: AC Waveform Generator Familiarization EXERCISE OBJECTIVE When you have completed this exercise, you will be able to operate an ac waveform generator by using equipment provided. You will verify your results by observing generator waveforms on the oscilloscope. DISCUSSION There are various types of ac waveform generators such as function, sine wave, and af (audio frequency) generators. These waveform generators are similar in the following respects. all are capable of generating ac waveforms. all can vary the frequency of the waveform produced. all can vary the amplitude of the waveform produced. all exhibit a characteristic output impedance. The frequency is adjusted by two controls: the range control and the frequency control, usually labeled FREQUENCY. The range (multiplier) control determines the span of frequencies the generator will produce. The multiplier may be marked: X1-X10-X100-X1K-X10K-X100K 10 FACET by Lab-Volt

2 The AC Waveform Generator frequency control may be a control knob graduated from 1 to 200. To determine the output frequency, multiply the frequency control setting by the multiplier control setting. Suppose the range of control is set to X100 and the frequency control is set to 20. The output frequency is a. 200 Hz b Hz c. 20 khz Use the generator controls to make a coarse, or approximate, frequency setting. In later units, the The type of output waveform (sine, square, triangle) produced can be selected using the corresponding FUNCTION or WAVEFORM control. FACET by Lab-Volt 11

3 The amplitude control, usually labeled LEVEL, AMPLITUDE, or AMPL, adjusts the amplitude of the output waveform. When a circuit displays the generator symbol with a broken line, an external generator connection is required. When a circuit displays the generator symbol with a solid line, an external generator connection is not required. 12 FACET by Lab-Volt

4 The AC Waveform Generator Look at the generator symbols on the AC 1 FUNDAMENTALS circuit board. Is the waveform generator internal or external? a. internal generator b. external generator PROCEDURE generator to the circuit block. In addition, use a two-post connector to connect the generator source (GEN) to resistor R1. Connect the channel 1 (X10) probe of the oscilloscope across R1. Switch the CH 1 vertical 0.2 ms. FACET by Lab-Volt 13

5 Set the generator function control for a sine wave output. Using the controls on the generator, set the frequency to approximately 1 khz. Adjust the amplitude to produce a sine wave six divisions high. 14 FACET by Lab-Volt

6 The AC Waveform Generator While observing the oscilloscope, increase the generator frequency control. Does the number of cycles displayed increase or decrease as the frequency is increased? a. increase b. decrease CONCLUSION To select the type of waveform at the output of a generator, set the control labeled FUNCTION or WAVEFORM. The frequency output of a generator is adjusted by two controls. The frequency control adjusts the The amplitude control adjusts the amplitude of the generator s output waveform. REVIEW QUESTIONS 1. The controls that adjust frequency on an ac generator are the frequency and a. range controls. b. amplitude controls. c. function controls. d. vertical controls. 2. When the range (multiplier) control of a generator is set to X10 and the frequency control is set to 20, the output frequency is a Hz. b. 20 Hz. c. 200 Hz. d. 20,000 Hz. FACET by Lab-Volt 15

7 3. The amplitude control on an ac generator is usually labeled a. MULTIPLIER. b. FUNCTION. c. RANGE. d. LEVEL. 4. Which statement is not characteristic of a typical ac generator? a. All are capable of generating ac waveforms. b. All can vary the frequency of the waveform produced. c. All can vary the amplitude of the waveform produced. d. All are capable of generating a dc waveform. 5. When the range (multiplier) control of a generator is set to X1K and the frequency control is set to 10, the output frequency is a Hz. b. 10 khz. c. 100 Hz. d. 1.0 khz. 16 FACET by Lab-Volt

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