User:Pandyan.elec/sandbox
SDLC PROJECT
'nitish'
COEP
ELECTRICAL
S.Y.Btech
. A device such as an oscilloscope is then used to measure the circuit's output. Function generators vary in the number of outputs they feature, frequency range, frequency accuracy and stability, and several other parameters A function generator is a device or software program that is designed to generate electrical waveforms. Function generators are electronic test equipment and are widely used in testing the response of circuits to input signals.
Function generator also known as a waveform generator produces wave forms of all types. The wave forms can be classified into two types such as single-shot or repetitive. Usually a waveform generator produces waveform that is produced by the repetitive discharging and charging of the capacitor to which is connected a constant energy source.
Users can choose other shapes of output forms based on their needs for the circuit testing. Shapes of waveform include square wave, sine wave, triangle wave and saw tooth waveforms. By altering the size of capacitor and by altering the current such waveform shapes can be generated in the function generator. There is a frequency controller option on the function generator that allows users to choose the rate at which the output signal oscillates.
In order to use a function generator, you may need to decide first on the waveform shape that is desired after powering on the function generator. The required output signals are configured in the function generator by connecting the leads of signal and ground to an oscilloscope Most function generators allow the user to choose the shape of the output from a small number of options. Square wave - The signal goes directly from high to low voltage. Sine wave - The signal curves like a sinusoid from high to low voltage. Triangle wave - The signal goes from high to low voltage at a fixed rate.
The amplitude control on a function generator varies the voltage difference between the high and low voltage of the output signal.
The direct current (DC) offset control on a function generator varies the average voltage of a signal relative to the ground.
The frequency control of a function generator controls the rate at which output signal oscillates. On some function generators, the frequency control is a combination of different controls. One set of controls chooses the broad frequency range (order of magnitude) and the other selects the precise frequency. This allows the function generator to handle the enormous variation in frequency scale needed for signals.
The duty cycle of a signal refers to the ratio of high voltage to low voltage time in a square wave signal.
How to use a function generator After powering on the function generator, the output signal needs to be configured to the desired shape. Typically, this means connecting the signal and ground leads to an oscilloscope to check the controls. Adjust the function generator until the output signal is correct, then attach the signal and ground leads from the function generator to the input and ground of the device under test. For some applications, the negative lead of the function generator should attach to a negative input of the device, but usually attaching to ground is sufficient
specifications
some of the importent specifications of Function Generator are as follows
- Its specific frequency range is between 0.001 to 20MHz.
- Frequency stability of function generator is 0.05%.
- Distortion of function generator is -55dB below 50KHz,-40dB above 50KHz.
- Specific value of Output amplitude(open circuit)is 10V(peak to peak).
- Specific value of Output impedance is 50ohm.
It can be used to produce different waveforms like sine wave, square wave, triangular wave, sawtooth wave, etc.