SM5011 High Accuracy Spectrum Analyzer 1050MHz with with tracing signal generator
Products descriptions
SM5010/5011 spectrum analyzer is used for the early test in the development of electrical products, troubleshooting of CATV/MATV system as well as the test and trouble diagnosis of cellular phone system. Combined with the near field probes of Mz530, it can detect the missing fields of radio frequency
SM5011 is equipped with a tracing signal generator, and in the combined use of spectrum analyzer and tracing signal generator, it can complete the work which cannot be done by other frequency sweep system, such as sweep generator, oscilloscope etc...
Input frequency response 
0.151050MHz, 3dB 
Display accuracy of central frequency 
+/200KHz (frequency sweep width +200KHz) 
Accuracy of mark frequency 
+/0.1% (frequency sweep width +100KHz) 
Frequency display resolution 
100KHz (4½ bit LED display) 
Frequency sweep width 
0.1MHz/div100KHz/div with 1, 2 and 5 step system 
And 0Hz/div (0 frequency sweep) Accuracy: +/10% (each range) 

Intermediate frequency bandwidth 
20KHz and 400KHz 
Video filter 
(When on) 4KHz 
Amplitude range 
107~+13dB 
Reference level 
27dB~+13dB (10dB for every step) +/2dB 
Average noise level 
97dB(20KHz intermediate frequency width) 
Display range of CRT screen 
80 dB(10dB/div) 
Display range of vertical display 
+/2dB (2 With attenuator) 250MHz signal 
Input attenuator 
040dB (4x10dB step) error: +/1dB/10dB 
Maximum input level 
+10dBm,+25V DC(Input attenuator set at 0dB) 
+20dBm (input attenuator set at 40dB) 

Frequency stability 
Over 150KHz/hour 
Input jack type 
BNC 
Input impedance 
50Ω 
220V/110V; +/10%; 50Hz/60Hz 

Tracing signal generator (SM5011 ONLY) 

Input frequency response 
0.151050MHz, 3dB 
Output level range 
50~+1dBm (4x10dB) +/3dB 
Output attenuator 
040dB (4x10dB step) error: +/1dB/10dB 
Input jack type 
BNC 
Input impedance 
50Ω 
Others 

DC output 
+6V (for probe) 
AM demodulation output 
Load impedance ≥16Ω 
The response characteristic of digital oscilloscope and its choose and buy skill
Another reason why high speed digital oscilloscope chooses brick wall reaction type is to avoid or minimize Aliasing phenomenon. When using digital oscilloscopes to measure high speed signals, graphics confusion can occur, mainly because some signals are mixed with unnecessary waveforms when reproducing the sampled high speed signals. These mixed signal frequency components can distort the original signal waveform and, in severe cases, cause measurement errors.
Most of the pattern confusion occurs in the analog to digital converter (adc) continuous signals, which contain components that exceed the Nyquist frequency, or half the sampling frequency.This component retraces in the Nyquist frequency domain and appears in the oscilloscope measurement bandwidth. It can be clearly seen from the frequency characteristic diagram that the figure confusion effect of the brick wall reactive oscilloscope is negligible.
Under the same conditions, it can be clearly seen that in the field beyond the Nyquist frequency of 2GHz, there is almost no signal, which can inhibit the occurrence of confusion.
In addition, if 20GHz, 10GHz and 5GHz sampling frequencies are used to measure waveforms with a period of 2.2ns and a rise time of about 90ps, different results will be obtained.The lower the sampling frequency is, the longer the actual measurement value of rising time is, and the waveform cannot be faithfully presented.
At present, the highspeed serial interface measurement USES the realtime sampling broadband digital oscilloscope, and the sampling frequency of the high performance machine equipped with the analog to digital converter is up to about 20GHz. Generally, in order to reduce the occurrence of graphics confusion, the sampling frequency of a gaussian reactive oscilloscope should be 46 times of the input signal, while that of a brick wall reactive oscilloscope only needs 2.5 times.
Generally, the frequency band is lower than 1GHz, so gaussian reaction system is mostly adopted, while the instruments higher than 1GHz are mostly brick wall reaction system.Table 2 shows the advantages and disadvantages of the two types of reactive oscilloscopes.
Choose oscilloscope according to performance requirement
So, how to choose the most suitable oscilloscope? There are four simple steps:
Calculate the highest frequency component fmax of the measured signal.The upper limit of the signal frequency component can be calculated by measuring the rising time of the signal.Assuming that the rise time is migrated from 20% to 80%, the approximate value can be estimated using the mathematical formula (0.4/ signal rise time) rather than directly from the data transmission rate.Take the popular thirdgeneration bus PCIExpress, which in most cases has a rise time of about 100ps.
Select the response characteristics of the oscilloscope. That is to choose a suitable one between the gaussian reaction system and the brick wall reaction system.
The necessary input bandwidth must be secured. It is related to the measurement error of rise time. An instrument company has done simulation experiments: if the brick wall reactive system allows 3% error, the bandwidth can be calculated with (1.4 fmax); If the error is limited to 10%, use (1.2 fmax) to calculate. When the tolerance error is 20%, it is calculated by (1.0 fmax).
Estimate the lowest sampling frequency. This value takes advantage of the above bandwidth value, which is a minimum (2.5 bandwidth) for a brick wall reactive oscilloscope.
The above four points can be used to illustrate a case: the rise time of 100ps digital signal, its fmax is 4GHz, select the brick wall reaction oscilloscope, assuming that the error of the rise time is limited to 3%, then the bandwidth of the input signal is 5.6ghz, therefore, the minimum sampling frequency also needs 14GHz.
If the sampling frequency of 14GHz is applied to the gaussian reaction system, the input bandwidth becomes 3.5ghz, and the rising time of the measured signal is 220ps, which is half of the difference with the brick wall reaction system.Some wideband realtime oscilloscopes rely on the active application of digital signal processing to realize the characteristics of brick wall reactive system.After all, circuit technology alone is unlikely to achieve desirable characteristics.
In a word, whether the bandwidth and sampling frequency are suitable or not is an important pointer when choosing expensive oscilloscope.In addition, understanding the characteristics of the test instrument is also the key to mastering the correct measurement.
How to use digital oscilloscope to distinguish analog bandwidth from digital real  time bandwidth？
Bandwidth is one vital index of oscilloscope. Bandwidth of analog oscilloscope is one certain value, however, bandwidth of digital oscilloscope has two kinds, analog bandwidth and digital realtime bandwidth. Digital oscilloscope to repeating the signal in a sequential sampling and random sampling technology can achieve the maximum bandwidth of the oscilloscope digital realtime bandwidth, realtime digital bandwidth and the highest frequency and digital waveform reconstruction technology related factor K = (digital realtime bandwidth digital highest rate/K), generally not directly given as an indicator. It can be seen from the definition of the two kinds of bandwidths that the analog bandwidths are only suitable for the measurement of repeated periodic signals, while the digital realtime bandwidths are suitable for the measurement of repeated signals and single signals at the same time.
The manufacturer Zhengzhou Defy claims the bandwidth of oscilloscope can achieve how many megabytes, it is analog bandwidth actually, digital real time bandwidth is below this value. For example, if the bandwidth of an oscilloscope is 500MHz, it actually means that its analog bandwidth is 500MHz, while the highest digital realtime bandwidth can only reach 400MHz, which is much lower than the analog bandwidth. Therefore, when measuring a single signal, it is necessary to refer to the digital realtime bandwidth of the digital oscilloscope, otherwise it will bring unexpected errors to the measurement.