By varying the current and the size of the capacitor, different frequencies may be obtained. As the output voltage reaches upper or lower limits, the charging or discharging is reversed using a comparator, producing the linear triangle wave. This produces a linearly ascending and descending voltage ramp. The triangular wave is generated by repeatedly charging and discharging a capacitor from a constant current source. This triangular wave is used as the basis for all of its other outputs.
Simple function generators usually generate triangular waveform whose frequency can be controlled smoothly as well as in steps. Function generators are primarily used for working with analog circuits, related pulse generators are primarily used for working with digital circuits.Įlectronic instruments Principles of Operation For example, they may be used as a signal source to test amplifiers or to introduce an error signal into a control loop. įunction generators are used in the development, test and repair of electronic equipment. Some function generators can be phase-locked to an external signal source (which may be a frequency reference) or another function generator. When those traits are required, other signal generators would be more appropriate. Integrated circuits used to generate waveforms may also be described as function generator ICs.Īlthough function generators cover both audio and radio frequencies, they are usually not suitable for applications that need low distortion or stable frequency signals. Another feature included on many function generators is the ability to add a DC offset. These waveforms can be either repetitive or single-shot (which requires an internal or external trigger source). Some of the most common waveforms produced by the function generator are the sine wave, square wave, triangular wave and sawtooth shapes.
Function generator use software#
In electrical engineering, a function generator is usually a piece of electronic test equipment or software used to generate different types of electrical waveforms over a wide range of frequencies. Supports output frequencies as high as 2 MHz, and output amplitudes up to 12V peak.Electronic test equipment used to generate electrical waveforms A simple analog function generator, circa 1990 A DDS function generator Sine, square, triangle, and sawtooth waveforms.Supports all the features of a traditional function generator such as adjustable frequency and amplitude.Arbitrary waveform generator output accepts waveform data from file-based information that can be automatically created by the oscilloscope application.Choose from five preprogrammed waveform shapes: sine, square, triangle, DC, white noise.With a single click on a button the required signal is generated. Eight user definable presets are available, in which often used signals can be stored. The generator will then generate this signal, while the amplitude, and frequency can still be adjusted. With the File button a signal file can be loaded into the function generator memory. It is also possible to generate a signal that was previously measured using the oscilloscope. Together with the "measure maximum values" mode from the spectrum analyzer this gives a fast and easy way to create frequency response graphs. It can be set manually but it can also copy the sweep limits from the lower frequency and higher frequency from the spectrum analyzer. The sweep operates together with the spectrum analyzer. The function generator also offers a sweep function. The frequency of the signal can be set from almost 0 to 2 MHz. A DC offset between 0 and 12 V can also be applied, along with a symmetry ranging from 1% to 99%. The amplitude of the signal can be freely set between 0 V and 12 V peak. The selected signal shape is immediately shown in the display of the generator. The function generator offers five default signal shapes: sine wave, triangle, square, DC and white noise. Other Product Categories: Obsolete Productsįunction/Arbitrary Waveform Generator Operation of the DI-770 Oscilloscope Function/Arbitrary Waveform Generator Operation.
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