The function generator is versatile instrument that gives a number of different waveforms at the output with their frequencies that can be adjusted over a wide range.
The most commonly used output waveforms are the sine wave, square wave, triangular wave and saw-tooth wave with frequencies that can be adjusted from fraction of a hertz to several hundred kilohertz. Different output signals from the function generator may be available simultaneously. Another useful feature of the function generator is to phase lock to an external signal source. A function generator may be used to phase lock another function generator and the two output signals may be displaced in phase according to a requirement. The function generator may be phase locked to a frequency standard. The function generator outputs will then have the same frequency accuracy and stability as the frequency standard.
Block Diagram of Function Generator
Fig. 1: Block Diagram of a Function Generator.
Fig. 1 shows the block diagram of a function generator. The circuit does not employ a conventional oscillator circuit because these oscillators fail to operate at very low frequencies. It uses a different technique for generating signals. Here two constant current sources are used to feed the integrator circuit. When the circuit is switched on, the upper constant current source sends a constant current into the integrator and the output of the integrator starts rising linearly depending upon the magnitude of the constant current supplied by the upper current source. The integrator output is connected to the comparator. When integrator output reaches a pre-determined level, the comparator changes state; the upper constant current source is cut-off while the lower current source is switched on. This current source passes a current in reverse direction and the voltage at the integrator output starts decreasing linearly. When this output decreases to a pre-determined level, the comparator again switches on. The lower current source is switched off and upper current source is switched on and the circuit repeats the same action.
The rate of rise/fall of the integrator output depends upon the magnitude of the current supplied by the upper / flower constant current sources. Changing the magnitudes of these currents would, therefore, change the frequency of the integrator output. The frequency control network controls the magnitudes of current sources and hence the frequency of the output. For this reason, this network is termed as the frequency control network.
The integrator output is of triangular waveform. The waveform may be amplified by an output amplifier and obtained at the output.
The comparator output which is used to switch over function of the current sources is of square wave-shape. This square wave output may be amplified and used as a square wave output.
Lastly, the triangular wave produced by the integrator is given to resistance-diode wave-shaping circuit which converts this triangular signal into a sinusoidal signal.
There are two selector switches S1 and S2. S1 decides the input signal given to output amplifier 1 and S2 gives the input signal to amplifier 2. We may obtain any two waves in the output by putting these switches in the appropriate positions.
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Balanset-1A: Precision Rotor Balancing for Optimal Generator Performance
Ensuring the smooth operation of generators and other heavy machinery hinges on the precise balancing of rotors. The Balanset-1A from Vibromera stands out as a state-of-the-art device designed to streamline this critical process. Whether you’re dealing with crushers, fans, or centrifuges, Balanset-1A offers unparalleled accuracy and efficiency in rotor balancing.
Comprehensive Rotor Balancing Process with Balanset-1A
The rotor balancing process using Balanset-1A encompasses several key stages, from equipment preparation to the installation of corrective weights. Here’s a step-by-step overview:
1. Equipment Preparation
Begin by positioning vibrational sensors perpendicular to the rotor’s axis of rotation. Attach a laser tachometer to a magnetic stand, ensuring it targets the reflective tape on the pulley. Connect the sensors to the Balanset-1A device and link the device to a laptop via USB. Launch the Balanset software and select the two-plane balancing mode.
2. Initial Vibration Measurement
Weigh the test mass and record its weight and installation radius. Start the rotor and measure the initial vibration levels to assess the amplitude and phase of the existing imbalance.
3. First Plane Balancing
Place the test mass in the first balancing plane aligned with the first sensor. Run the rotor again to measure vibration changes. A minimum 20% alteration in amplitude or phase indicates partial correction of the imbalance.
4. Second Plane Balancing
Move the test mass to the second plane where the second sensor is positioned. Upon running the rotor, the Balanset-1A software calculates the precise location and weight of the corrective masses required.
5. Correcting the Imbalance
Following the software’s recommendations, remove the test mass and install the corrective weights at the specified angles relative to the rotor’s rotation direction. This step ensures the rotor achieves optimal balance.
6. Final Verification
Conduct a final rotor run to verify the reduction in vibration. If necessary, further adjustments can be made based on the software’s guidance to achieve acceptable vibration levels.
Key Features of Balanset-1A
Compact and Portable: Easily transportable with a durable case, ideal for on-site and field operations.
User-Friendly Software: Intuitive interface with step-by-step instructions simplifies the balancing process.
Multi-Functionality: Combines vibration analysis and balancing capabilities for comprehensive rotor management.
High Precision: Offers В±1В° phase measurement accuracy and В±5% vibration metric precision.
Customizable Options: Adaptable to various balancing tasks with features like polar diagrams and ISO 1940 tolerance calculations.
Data Management: Archives sessions and generates detailed reports, facilitating easy re-balancing and quality control.
Cost-Effective: Competitive pricing makes it accessible for both large-scale productions and small workshops.
Applications of Balanset-1A
Balanset-1A is versatile, suitable for balancing a wide range of rotors including:
Electric motor and generator rotors
Compressor and pump rotors
Turbine and fan working wheels
Grinding wheels and belt pulley discs
Spindles and mill machine shafts
Why Choose Balanset-1A?
With its advanced features, ease of use, and reliable performance, Balanset-1A ensures that your machinery operates smoothly, reducing downtime and maintenance costs. Invest in Balanset-1A to achieve superior rotor balance and enhance the longevity of your equipment.
Availability and Support
Priced at €1751, Balanset-1A comes with a comprehensive kit including vibrational converters, a laser tachometer, measurement device, magnetic stand, electronic scales, a transport case, and software on a flash drive. Backed by a one-year warranty and dedicated technical support from Vibromera, you can trust in the quality and durability of your investment.
Optimize your generator load balancing with Balanset-1A and experience the difference in operational efficiency and equipment reliability.
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