第1个回答 2008-12-24
Signal generator
For the parameters of the electrical testing signals. According to the signal waveform can be divided into sine signals, function (waveform) signal, the pulse signal and random signal generator etc.
Sine signal generator sine signal is mainly used in the measurement circuit and frequency characteristics of the system, and the nonlinear distortion, gain and sensitivity, etc. According to the low frequency signal generator coverage divided, the high frequency signal generator and microwave signal generator, According to the output level adjustable scope and stability is divided into simple signal generator (i.e. source), standard signal generator (power output can accurately - 100 db attenuation HaoWa below) and power output signal generator (above) HaoWa dozens of power, By way of frequency changing into harmonic.structure signal generator, sweeping frequency signal generator, program-controlled type signal generator and frequency signal generator synthesis type etc.
Low frequency signal generator (200-20,000 include audio and video (1) hittite ~ 10 MHZ) range of sine wave generator. The average level in the RC type oscillator, usable also difference frequency oscillators. To facilitate testing system frequency characteristics, output amplitude frequency characteristics and waveform distortion.
The high frequency signal generator frequency for 100 KHZ ~ 30 MHZ of high-frequency, 30 ~ 300 300-megahertz VHF signals generator. Generally USES the LC oscillators, harmonic.structure by tuning frequency capacitor for calibration. Main purpose is to measure the technical indexes of receiver. The output signal of internal or low available plus sinusoidal output amplitude, frequency and voltage to decay to 1 software-processable microvolt. Standard signal generator (figure 1) standard signal generator diagram of the output signal level, can accurate reading of amplitude and frequency can meter reading. In addition, the instrument and prevent leakage of good shielding signal.
Microwave signal generator FenMiBo until millimeter wave bands from the signal generator. Usually by signal with distributed parameter resonator and reflection of speed uhf triode tube, but there were gradually produce microwave transistors, mosfet and GengShi diodes solid device instead. Instrument by mechanical cavities commonly attuned to change the frequency, each may cover an octave band around the coupling of cavities commonly signal power can reach up to 10 HaoWa above. Simple signal can only add 1,000 HeFang wave attenuation, and standard signal generator can be output level adjustment datum, from January to HaoWa after attenuator, read the signal level db HaoWa value, Also must have a rectangular pulse amplitude internal or additional testing radar receiver to etc.
Sweep frequency and program signal generator can generate sweep frequency signal generator frequency, amplitude constant in linear range for the change. In the high frequency and low frequency scanning for VHF with voltage or current control oscillation loop components (e.g. transfiguration magnetic coil pipe or) to realize the sweep frequency oscillation, In the early period of using microwave frequency sweep, use voltage tuned to change the helix electrode dc voltage change of oscillation frequency, widely used in tuning frequency sweep, magnetic ferrite made of solid ball YIG microwave circuits, tuning oscillator with scanning electric control dc magnetic resonance frequency of the ball change. Sweep frequency signal generator has automatic sweep frequency, remote control, controller and etc.
This type of signal generator frequency synthesized by the signal generator is directly, but with oscillator high stability quartz oscillator frequency source, using a standard for forming technology of frequency signal, any standard and frequency of the same frequency source of accuracy and stability. According to the output signal frequency usually choose, the highest decimal digit of 11 to high resolution. Besides using frequency also manually choose programmable and remote control, also can undertake step class type sweep frequency, suitable for automatic test system. By direct frequency synthesizer, addition and multiplication crystal oscillation, filter and amplification etc, transform circuit quickly but circuit complex, the frequency of the highest frequency output only 1000 MHZ. Use morer JianJieShi frequency synthesizers is using standard frequency source through phase lock loop control electric tuning oscillator (in PLL also can realize the octave, frequency and frequency mixing), to produce and export various needs of the signal frequency. The highest frequency synthesizer JiHe 26.5 can reach. The high stability and high resolution of frequency synthesizer with multiple functions, amplitude, frequency modulation (PRCPM), plus amplification and attenuation, steady and circuit, constitute a new kind of high performance and synthesis of programmable signal generator, also can be in a phase-locked type swept-frequency generators
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第2个回答 2008-12-24
Signal generator
Creating the necessary parameters of electrical test equipment signals. According to signal waveforms can be divided into sinusoidal signal, function (waveform) signal, pulse signal and random signal generator, such as four groups.
Sinusoidal signal sinusoidal signal generator, the main circuit and system for measuring the frequency characteristics of nonlinear distortion, gain and sensitivity. According to the frequency of coverage is divided into low-frequency signal generator, high-frequency signal generator and microwave signal generator; by output level adjustment range can be divided into simple and stable signal generator (that is, signal source), standard signal generator (output Power can accurately -100 dB attenuation to milliwatts or less) and power signal generator (output power up to more than tens of milliwatts); by way of the frequency change is divided into tuner signal generator, sweep signal generator, program-controlled signal generator and frequency synthesizer, such as signal generator.
Low-frequency signal generator including audio (200 ~ 20,000 Hz) and video (1 Hz to 10 MHz) range of sine wave generator. Main vibration level tends to be used RC-type oscillator, beat frequency oscillator can also be used. In order to facilitate the testing system frequency characteristics require output amplitude-frequency characteristic calm waveform distortion small.
High-frequency signal generator frequency of 100 kHz to 30 MHz high-frequency, 30 ~ 300 MHz VHF signal generator. Generally tuned LC-type oscillator, the frequency can be tuned capacitors dial scale read out. The main purpose is to measure a variety of technical indicators receiver. Output signal can be used internal or external low-frequency sinusoidal AM or FM signal, so that the carrier frequency output voltage can be attenuated to 1 micro-volt below. Standard signal generator (Figure 1 diagram of the standard signal generator) output signal level accurate readings, the increase in the rate of transfer or offset meter can also read out. In addition, the equipment there to prevent signal leakage good shielding.
Microwave signal generator from the UHF band up to millimeter-wave signal generator. Signal is usually distributed parameter resonator with the ultra-high frequency transistors and reflex klystron, but are gradually being microwave transistor, FET and Gunn diodes and other devices to replace the solid trend. Generally rely on mechanical devices tuned cavity to change the frequency of each can cover an octave or so, coupled by the cavity of the signal power of up to 10 mW or more generally. Simple signal source can be added only 1,000 square Joseph AM, and the standard signal generator is able to adjust the output level benchmarks to 1 mW, and then from behind with the attenuator signal level read out the decibel milliwatts value; also must There are internal or external rectangular pulse amplitude modulation, in order to test radar receiver.
Sweep and program-controlled signal generator frequency sweep signal generator can produce a constant rate, the frequency of a limited scope for changes in the linear signal. In the high-frequency and high frequency bands with low-frequency scanning voltage or current control oscillation circuit components (such as varactor or core coil) to achieve the oscillation frequency sweep; early adopters in the microwave tuning voltage swept by changing the backward wave helix DC voltage electrodes to change the oscillation frequency, and later widely used in magnetic tuning sweep to YIG ferrite microwave solid ball for tuning oscillator circuit, by scanning the magnetic field to change the DC current control of the resonant frequency of the ball. Sweep sweep signal generator with automatic, manual, program-controlled and far-control and other work.
Frequency synthesizer signal generator signal generator that is not directly produced by the oscillator, but high stability crystal oscillators as a standard frequency source, the use of frequency synthesis technology required for the formation of arbitrary frequency signal, with the standard frequency the source of the same frequency accuracy and stability. Output signal frequency is usually 10 digits may choose a maximum capacity of 11 high-resolution digital. In addition to manually select the frequency of use can also be programmed and far outside the control can also be carried out step-style sweep, suitable for automatic test systems. Direct frequency synthesizer by the crystal oscillation, addition, multiplication, such as filtering and amplification circuit, but quickly transform frequency circuit complexity, the maximum output frequency can only be reached around 1000 MHz. More use of indirect frequency synthesizer is to use the standard frequency source through the control of electrical tuning oscillator phase-locked loop (in the loop at the same time to achieve frequency doubling, frequency and mixer), to produce and export a variety of the required frequency signal. This synthesizer can reach the highest frequency of 26.5 GHz. High stability and high-resolution frequency synthesizer, with a variety of modulation functions (AM, FM and PM), plus zoom, steady increases and attenuation circuit, they constitute a new type of high-performance, can be programmed the synthesized signal generator, but also as a phase-locked-type sweep generator
第3个回答 2008-12-24
Signal generator
Parameters required to generate electrical signals in the test apparatus. According to the signal can be divided into sine wave signal, function (wave) signals, pulse signals and random signal generator, and other four major categories.
Sinusoidal signal generator sinusoidal signal of the main circuit and systems used to measure the frequency characteristics of the nonlinear distortion, and gain sensitivity and so on. According to the frequency of coverage is divided into low-frequency signal generator, high-frequency signal generator and microwave signal generator; by adjustable output level and scope of the stability is divided into simple signal generator (that is, the signal source), the standard signal generator (output Power accurate attenuation to -100 dB the following mW) power and signal generator (up to tens of milliwatts output power above); according to the frequency of changes in the way of tuning into signal generator, the sweep signal generator program Signal generator and synthesizer signal generator, and so on.
Including the low-frequency audio signal generator (200 ~ 20,000 Hz) and video (1 Hz to 10 MHz) of the scope of the sine wave generator. Vibration level with the general RC-oscillator-frequency oscillator can also be poor. In order to facilitate the testing of the system frequency characteristics of the output requirements of moderate amplitude waveform distortion small.
High-frequency signal generator frequency of 100 kHz to 30 MHz frequency, 30 MHz to 300 very high frequency signal generator. The general use of LC-tuned oscillator frequency tuning capacitor can be the degree of scale to read out the set. The main purpose is to measure a variety of technical indicators receiver. Output signal can be internal or external low-frequency sine AM or FM signal, so that the carrier frequency output voltage to decay to below 1 V microcontroller. Standard signal generator (Figure 1 standard signal generator diagram) of the output signal level accurate readings, the increase in the rate of transfer or shift can also read the meter. In addition, there are instruments to prevent the leakage of good signal shielding.
Microwave signal generator from the UHF band up to the millimeter-wave signal generator. Usually with the distribution of signals from the cavity parameters of the ultra-high frequency transistors and reflex klystron, but have been gradually microwave transistor, FET and Gunn diodes, and other devices to replace the solid trend. General machinery equipment by tuning cavity to change the frequency of each cover an octave or so, the body cavity by coupling a signal to the general power of up to 10 milliwatts or more. Simple source can only add 1,000 square He AM, and the standard signal generator is able to adjust the output level to the base 1 mW, and then from behind with the attenuator read out the signal level of the value of the decibel milliwatts; must also There are internal or external rectangular pulse amplitude modulation, in order to test the radar receiver, and so on.
Sweep and program-controlled signal generator sweep signal generator can produce a constant rate, the frequency of a limited scope for changes in the linear signal. In the high-frequency and high frequency bands with low-frequency scanning voltage or current control oscillation circuit components (such as varactor coil or core) to achieve the oscillation frequency sweep; paragraph early in the microwave using tuning voltage sweep, change the backward wave helix The electrode voltage direct current to change the oscillation frequency, and later widely used in magnetic tuning sweep to YIG ferrite ball solid microwave oscillator for the tuning circuit, DC current control by scanning the magnetic field to change the ball's resonant frequency. Sweep sweep signal generator with automatic, manual, program-controlled and well-controlled manner, and so on.
Synthetic-frequency signal generator signal generator that is not directly produced by the oscillator, but rather on the high stability crystal oscillators as a standard frequency source, the use of synthesizer technology required for the formation of any frequency signal, with frequency standards The same source frequency accuracy and stability. Output signal frequency can usually choose to decimal numbers, to a maximum of 11-digit high resolution. In addition to manually select the frequency of use and far outside the program can also be controlled, can also be carried out step-by-step class-sweep for ATS. Direct frequency synthesizer by the crystal oscillator, addition, multiplication, such as filtering and amplification circuit, but the rapid transformation frequency circuit complexity, the maximum output frequency can only be reached around 1000 MHz. Used more indirect frequency synthesizer is the source through the use of standard frequency tuning oscillator phase locked loop power control (in the loop at the same time be able to achieve in the octave, and the frequency mixer), to produce and export a variety of the To be the signal frequency. This synthesizer of the highest frequency of up to 26.5 GHz. High stability and high-resolution frequency synthesizer, with multi-function modulation (AM, FM and PM), together with the enlarged, and the steady increase attenuation circuit, it will constitute a new type of high-performance, the program Synthesized signal generator, but also as a lock-in-sweep generator
第4个回答 2008-12-24
Signal generator
Parameters required to generate electrical signals in the test apparatus. According to the signal can be divided into sine wave signal, function (wave) signals, pulse signals and random signal generator, and other four major categories.
Sinusoidal signal generator sinusoidal signal of the main circuit and systems used to measure the frequency characteristics of the nonlinear distortion, and gain sensitivity and so on. According to the frequency of coverage is divided into low-frequency signal generator, high-frequency signal generator and microwave signal generator; by adjustable output level and scope of the stability is divided into simple signal generator (that is, the signal source), the standard signal generator (output Power accurate attenuation to -100 dB the following mW) power and signal generator (up to tens of milliwatts output power above); according to the frequency of changes in the way of tuning into signal generator, the sweep signal generator program Signal generator and synthesizer signal generator, and so on.
Including the low-frequency audio signal generator (200 ~ 20,000 Hz) and video (1 Hz to 10 MHz) of the scope of the sine wave generator. Vibration level with the general RC-oscillator-frequency oscillator can also be poor. In order to facilitate the testing of the system frequency characteristics of the output requirements of moderate amplitude waveform distortion small.
High-frequency signal generator frequency of 100 kHz to 30 MHz frequency, 30 MHz to 300 very high frequency signal generator. The general use of LC-tuned oscillator frequency tuning capacitor can be the degree of scale to read out the set. The main purpose is to measure a variety of technical indicators receiver. Output signal can be internal or external low-frequency sine AM or FM signal, so that the carrier frequency output voltage to decay to below 1 V microcontroller. Standard signal generator (Figure 1 standard signal generator diagram) of the output signal level accurate readings, the increase in the rate of transfer or shift can also read the meter. In addition, there are instruments to prevent the leakage of good signal shielding.
Microwave signal generator from the UHF band up to the millimeter-wave signal generator. Usually with the distribution of signals from the cavity parameters of the ultra-high frequency transistors and reflex klystron, but have been gradually microwave transistor, FET and Gunn diodes, and other devices to replace the solid trend. General machinery equipment by tuning cavity to change the frequency of each cover an octave or so, the body cavity by coupling a signal to the general power of up to 10 milliwatts or more. Simple source can only add 1,000 square He AM, and the standard signal generator is able to adjust the output level to the base 1 mW, and then from behind with the attenuator read out the signal level of the value of the decibel milliwatts; must also There are internal or external rectangular pulse amplitude modulation, in order to test the radar receiver, and so on.
Sweep and program-controlled signal generator sweep signal generator can produce a constant rate, the frequency of a limited scope for changes in the linear signal. In the high-frequency and high frequency bands with low-frequency scanning voltage or current control oscillation circuit components (such as varactor coil or core) to achieve the oscillation frequency sweep; paragraph early in the microwave using tuning voltage sweep, change the backward wave helix The electrode voltage direct current to change the oscillation frequency, and later widely used in magnetic tuning sweep to YIG ferrite ball solid microwave oscillator for the tuning circuit, DC current control by scanning the magnetic field to change the ball's resonant frequency. Sweep sweep signal generator with automatic, manual, program-controlled and well-controlled manner, and so on.
Synthetic-frequency signal generator signal generator that is not directly produced by the oscillator, but rather on the high stability crystal oscillators as a standard frequency source, the use of synthesizer technology required for the formation of any frequency signal, with frequency standards The same source frequency accuracy and stability. Output signal frequency can usually choose to decimal numbers, to a maximum of 11-digit high resolution. In addition to manually select the frequency of use and far outside the program can also be controlled, can also be carried out step-by-step class-sweep for ATS. Direct frequency synthesizer by the crystal oscillator, addition, multiplication, such as filtering and amplification circuit, but the rapid transformation frequency circuit complexity, the maximum output frequency can only be reached around 1000 MHz. Used more indirect frequency synthesizer is the source through the use of standard frequency tuning oscillator phase locked loop power control (in the loop at the same time be able to achieve in the octave, and the frequency mixer), to produce and export a variety of the To be the signal frequency. This synthesizer of the highest frequency of up to 26.5 GHz. High stability and high-resolution frequency synthesizer, with multi-function modulation (AM, FM and PM), together with the enlarged, and the steady increase attenuation circuit, it will constitute a new type of high-performance, the program Synthesized signal generator, but also as a lock-in-sweep generator