The frequency domain measurement of the radio frequency power is the use frequency spectrum and most fundamental measurement that the vector sigmal analyzer pays. This kind of system must accord with relevant standard restriction on power transfer and parasitic noise radiation, also furnished with appropriate measurement technique to avoid the error.

Like frequency domain, center frequency, resolution bandwidth RBW It will influence the measuring result and measurement time, these keys about frequency, controls.

The frequency domain means the total spectral weight that the analysis meter can catch, and center frequency is equivalent to the centre of the frequency domain. Should notice the alter-cycle control like frequency domain determining the frequency domain on the instrument front panel. On the other hand, on the basis of the magnitude of the frequency domain, FFT sigmal analyzer has two completely different collection modes.

The realization way of frequency domain up to RBW is in the instrument: Carry on down-conversion to the segment frequency, then carry on digitization to the down-conversion signal. And to beyond the scope of frequency of RBW, go on frequency conversion and digitization to the wavelength coverage sequentially. Axile frequency resolution of RBW control frequency. In the traditional analysis meter, make use of a narrow-band filter to scan the frequency domain to realize frequency spectrum reveal. The electric-wave filter bandwidth has determined the axile definition of the frequency, so is a sign controlled too.

Meanwhile, the analysis meter which adopts FFT does not have analog filter, but adopt FFT and relevant window parameter windowingparameter To confirm frequency resolution or RBW. Different with the traditional spectrum analyzer, the analysis meter of the latest adoption FFT can choose the window to restrain frequency spectrum from letting out and improving and separating the definition of the minor frequency band in the middle of the frequency domain at present. Will those people familiar with FFT analysis meter and FFT ask, what relation is the tapped width of RBW frequency resolution and FFT perhaps? RBW frequency resolution parameter stipulate in 3dB and in the new RF sigmal analyzer of display of Table 1 RBW definition in 6dB place Relation of the width of taking a percentage with FFT.

Table 1: The width is correlated with in definition and taking a percentage of FFT analysis meter for RBW frequency analysisAdopt the analysis meter of FFT to have window that is chosen, are used for restraining frequency spectrum from letting out and improving and separating the minor spectral definition in the middle of the frequency domain. But the traditional spectrum analyzer does not have this function. Measurement time or sweep time of the scanning analysis meter of the tradition In inverse proportion to the square of RBW, this is defined by build-up time of the analog filter. If improve the frequency resolution by reducing RBW, then sweep time wants to be that an index increase.

On the contrary, with the reducing of RBW, the collection that FFT sigmal analyzer carries on is longer, calculation sum is greater too. With the intersection of DSP and the intersection of device and quickening of speed, measure speed to be fast, thus realize more high resolution ratio or narrower RBW measurement.

Fig. 1: The spectrum analyzer measures consequential frequency and range relationThe range is set up

Different amplitude control will influence the measuring result too, these include reference level reflevel ,The attenuation pad sets up and measures the mode. The reference level has set up the maximum input span of the spectrum analyzer. It controls the Y-axis, ” volts/div ” on ondoscope of this dot and Similar, must have set up it and got and has been just greater than the desired maximum power measured value.

The value of the best reference level should make the minimum instrument distorted very low reference level of making the input signal saturate cause And minimum noise base reference level is too high, reduce degree of sensitivity and dynamic range of the instrument and cause Make the equilibrium. Sometimes, it is beneficial to the noise measurement of broadband to set up a low reference level, though it is distorted to produce some instruments. When can approve distortedly ing, the degree of sensitivity that will improve the instrument of doing it in this way, and guarantee to exclude it in measurement.

The attenuation pad sets up and controls the input span determining the instrument too. This arrangement is usually set up to the automatic mode, the software adjusts the value of the attenuation pad according to reference level.

In firmware, Y-axis, reference level and the intersection of attenuation pad and together linkage of display unit spectrum analyzer. The fictitious instrument has no restriction, while needing, the Y-axis of the display unit breaks away from the control all right. This function can realize spectrally that visual and zoom, and does not influence the range of the instrument to set up. Be careful, it influences the programmable attenuation pad that reference level and attenuation pad are set up, so only need to set up one of them.

It is a control mode of another range to measure the mode, can be used in the traditional scanning spectrum analyzer, but can’t be used in the analysis meter based on FFT. Can be divided into modes such as ordinary, crest value, sampling or negative peak,etc., it determines how to reduce the spectrum analyzer to measure the mode specifically

Lack spectral information, how to compress spectral information in other words.

In addition it still influences the general measurement of power. Can exceed spectrum analyzer expicity hour such as point size as spectral data point, the analysis meter will reduce to benefit in the tactics from the data. This will make to measure the mode to change the measurement of power.

Table 2: The measurement mode of the spectrum analyzer can influence the measuring result of the powerThe frequency domain measurement of the radio frequency power is the use frequency spectrum and most fundamental measurement that the vector sigmal analyzer pays. This kind of system must accord with relevant standard restriction on power transfer and parasitic noise radiation, also furnished with appropriate measurement technique to avoid the error.

Like frequency domain, center frequency, resolution bandwidth RBW It will influence the measuring result and measurement time, these keys about frequency, controls.

The frequency domain means the total spectral weight that the analysis meter can catch, and center frequency is equivalent to the centre of the frequency domain. Should notice the alter-cycle control like frequency domain determining the frequency domain on the instrument front panel. On the other hand, on the basis of the magnitude of the frequency domain, FFT sigmal analyzer has two completely different collection modes.

The realization way of frequency domain up to RBW is in the instrument: Carry on down-conversion to the segment frequency, then carry on digitization to the down-conversion signal. And to beyond the scope of frequency of RBW, go on frequency conversion and digitization to the wavelength coverage sequentially. Axile frequency resolution of RBW control frequency. In the traditional analysis meter, make use of a narrow-band filter to scan the frequency domain to realize frequency spectrum reveal. The electric-wave filter bandwidth has determined the axile definition of the frequency, so is a sign controlled too.

Meanwhile, the analysis meter which adopts FFT does not have analog filter, but adopt FFT and relevant window parameter windowingparameter To confirm frequency resolution or RBW. Different with the traditional spectrum analyzer, the analysis meter of the latest adoption FFT can choose the window to restrain frequency spectrum from letting out and improving and separating the definition of the minor frequency band in the middle of the frequency domain at present. Will those people familiar with FFT analysis meter and FFT ask, what relation is the tapped width of RBW frequency resolution and FFT perhaps? RBW frequency resolution parameter stipulate in 3dB and in the new RF sigmal analyzer of display of Table 1 RBW definition in 6dB place Relation of the width of taking a percentage with FFT.

Table 1: The width is correlated with in definition and taking a percentage of FFT analysis meter for RBW frequency analysisAdopt the analysis meter of FFT to have window that is chosen, are used for restraining frequency spectrum from letting out and improving and separating the minor spectral definition in the middle of the frequency domain. But the traditional spectrum analyzer does not have this function. Measurement time or sweep time of the scanning analysis meter of the tradition In inverse proportion to the square of RBW, this is defined by build-up time of the analog filter. If improve the frequency resolution by reducing RBW, then sweep time wants to be that an index increase.

On the contrary, with the reducing of RBW, the collection that FFT sigmal analyzer carries on is longer, calculation sum is greater too. With the intersection of DSP and the intersection of device and quickening of speed, measure speed to be fast, thus realize more high resolution ratio or narrower RBW measurement.

Fig. 1: The spectrum analyzer measures consequential frequency and range relationThe range is set up

Different amplitude control will influence the measuring result too, these include reference level reflevel ,The attenuation pad sets up and measures the mode. The reference level has set up the maximum input span of the spectrum analyzer. It controls the Y-axis, ” volts/div ” on ondoscope of this dot and Similar, must have set up it and got and has been just greater than the desired maximum power measured value.

The value of the best reference level should make the minimum instrument distorted very low reference level of making the input signal saturate cause And minimum noise base reference level is too high, reduce degree of sensitivity and dynamic range of the instrument and cause Make the equilibrium. Sometimes, it is beneficial to the noise measurement of broadband to set up a low reference level, though it is distorted to produce some instruments. When can approve distortedly ing, the degree of sensitivity that will improve the instrument of doing it in this way, and guarantee to exclude it in measurement.

The attenuation pad sets up and controls the input span determining the instrument too. This arrangement is usually set up to the automatic mode, the software adjusts the value of the attenuation pad according to reference level.

In firmware, Y-axis, reference level and the intersection of attenuation pad and together linkage of display unit spectrum analyzer. The fictitious instrument has no restriction, while needing, the Y-axis of the display unit breaks away from the control all right. This function can realize spectrally that visual and zoom, and does not influence the range of the instrument to set up. Be careful, it influences the programmable attenuation pad that reference level and attenuation pad are set up, so only need to set up one of them.

It is a control mode of another range to measure the mode, can be used in the traditional scanning spectrum analyzer, but can’t be used in the analysis meter based on FFT. Can be divided into modes such as ordinary, crest value, sampling or negative peak,etc., it determines how to reduce the spectrum analyzer to measure the mode specifically

Lack spectral information, how to compress spectral information in other words.

In addition it still influences the general measurement of power. Can exceed spectrum analyzer expicity hour such as point size as spectral data point, the analysis meter will reduce to benefit in the tactics from the data. This will make to measure the mode to change the measurement of power.

Table 2: The measurement mode of the spectrum analyzer can influence the measuring result of the powerFactor influencing precision

The spectrum analyzer is adopted initially and stopping the frequency scanning between the frequency. A simulation ramp signal produces the scanning signal of this frequency, and the initial frequency is from coming from high-accuracy time reference signal synthesis. Then, survey accuracy determines from imitating the center frequency of ramp signal and IF electric-wave filter.

On the basis of the analysis meter of FFT, there is no such simulation ramp signal, so there are not the restrictions of these factors, to have concerted precision in the whole measurement limit. The inner precision of the range depends on the time base and measures algorithms, so can obtain frequency accuracy and repeatability more easily.

In scanning the analysis meter traditionally type, the reason of the frequency error includes the frequency error of the basic reference, the frequency domain precision 5% of the range And RBW 15% of RBW . Accordingly, the frequency error in the analysis meter based on FFT includes frequency error and RBW of the basic reference, depend on measuring algorithms specifically, the excursion is