High power function generator

High power function generator

The RMS voltage for the square wave is the same (an easy way to see this is to take the negative-going portion and flip it about the horizontal axis; this is allowed as far as its heating ability is concerned). The peak-to-peak voltage is, again, twice the amplitude voltage and in this case equivalent to twice the RMS voltage. If a square wave has a DC offset equal to its amplitude, it becomes a pulse waveform (and can be positive or negative). It is important to note that RMS value is not the same for other types of waveforms. This relationship to the amplitude only applies to sine waves. What should I look for when buying an arbitrary waveform generator?. Another measure used for the amplitude is the peak-to-peak voltage. To use a function or arbitrary waveform generator to its best advantage, the user should have a basic understanding of the instrument's controls, features, and operating modes. This guidebook is useful to those with little knowledge of function generators, as well as the experienced technician or engineer who wishes to refresh his/her memory or explore new uses for function generators and more sophisticated arbitrary waveform generators. Most modern function generators use Direct Digital Synthesis (DDS) for generating their output waveforms. Older generators used analog methods, which greatly increased the part count (component count) and made them sensitive to component aging and thermal drift. This section describes how DDS technology works. We ignore the implementation details and just look at the principles. There are a variety of function generators on the market spanning the cost range from a few tens of dollars to tens of thousands of dollars. Some are dedicated instruments (the ones we will look at in more detail), some are black boxes with USB interfaces and an output terminal, some are plugged into computer or instrumentation buses, and some are software programs that run on a PC to generate waveforms on the parallel port or via a sound card. There are also inexpensive kits for hobbyists. Adjust frequency sweep start frequency, sweep stop frequency, and display intensity. This ramp R(t) varies linearly between 0 and 1 with period T. Now, suppose we have any arbitrary function f( ξ ) that is defined on the interval 0≤. Turns the frequency sweep mode on and off and allows selection of a linear sweep or logarithmic sweep. There are two fundamental ideas of DDS technology:. The DC offset voltage V dc moves the whole sinusoidal waveform up and down with respect to the horizontal axis. where A is the amplitude in volts, t is time in seconds (the horizontal axis), V is the vertical axis in volts, and f is the frequency of the sine wave in Hz. is the phase of the sine wave (in the graph, the sine wave is shown with a phase of 0). DDS function generators may have the ability to let the user set the amplitude using the peak-to-peak voltage or the RMS voltage. Some generators let the user set the amplitude in dBm, which represents a power of 1 mW. The voltage that this represents depends on the associated load resistance. You can calculate the RMS voltage V RMS for a given dBm value and resistance R in from the following equation: Two other measures of a sine wave's amplitude are often used: RMS and peak-to-peak voltage. The RMS (root mean square) value is used to measure the heating ability of a waveform. The RMS voltage value of a periodic waveform is the value of a DC voltage which would deliver the same effective power (or heating ability) to a load as does the periodic waveform. For a sine wave, the RMS amplitude is shown as V RMS in the figure. The relationship of the RMS amplitude to the amplitude of a sine wave is. A square wave is shown in the following figure:. How do I lock my generator to another generator?. There's a lot of ringing on my pulses/square waves. Adjusts the parameter selected by the other buttons. Adjusts the duty cycle or symmetry of the displayed waveform. The mathematical representation of the sine wave is. microwave/convection oven or from other heat producing appliances. Back to Microwave Oven Repair FAQ Table of Contents. Interference (RFI) between it and any electronic equipment which might be. Instant (2 minutes on HIGH) microwave oven theory. or motor lubrication. Attending to these minor problems now may prevent. Keep your kitchen clean. Yes, I know, this isn't exactly microwave. Oven heats on high setting regardless of power setting. unresponsive or stuck buttons or erratic operation. Do not use strong. With small to medium size microwave ovens going for $60-100 it hardly makes sense to spend $60 to have one repaired. Even full size microwave ovens with full featured touchpanel can be had for under $200. Thus, replacement should be considered seriously before sinking a large investment into an older oven. Why don't microwaves leak out from through the glass?. the mesh will likely clog up more quickly than the original louvers so make. This document provides maintenance and repair information applicable to most of the microwave ovens in existence. It will enable you to quickly determine the likely cause and estimate the cost of parts. You will be able to make an informed decision as to whether a new oven is the better alternative. With minor exceptions, specific manufacturers and models will not be covered as there are so many variations that such a treatment would require a huge and very detailed text. Rather, the most common problems will be addressed and enough basic principles of operation will be provided to enable you to narrow the problem down and likely determine a course of action for repair. In many cases, you will be able to do what is required for a fraction of the cost that would be charged by a repair center - or - be able to revive something that would otherwise have gone into the dumpster or continued in its present occupation as a door stop or foot rest. An MOV, probably on the controller, may have shorted due to a power. Inspect the cord and plug for physical damage and to make sure the. holes or grills. Clean them up and use a vacuum cleaner to suck up. Most people do not do anything to maintain a microwave oven. Many will go for 20 years or more without any noticeable decline in performance. While not much preventive maintenance is needed, regular cleaning at least will avoid potentially expensive repairs in the future. Most of this involves things that don't require going inside and anyone can do. A shop that wants to add on preventive maintenance while doing some other repair is just trying to pad their wallet - anything that was required to ensure the health of the oven should have been included.:). cheaper to buy, cheaper and easier to service, and possibly more reliable. Put the microwave oven on its own dedicated 3 wire grounded circuit. Periodically check for built up dust and dirt around the ventilation. of the outlet during use of the microwave oven. If there is, spread the. loose dust. Keeping the ventilation free will minimize the chance of. ESR Meter kit is an amazing multimeter that measures ESR values, capacitance (100pF - 20,000uF), inductance, resistance (0.1 Ohm - 20 MOhm), This notice is included in its entirety at the beginning.