Model 

Bandwidth 
120MHz 
Channel 
2 
RealSample Rate 
1GSa/s 
Equivalent Sample Rate 
25GSa/s 
Record Length 
1M 
Rish time 
≤1.7ns/≤2.3ns/≤2.9ns/≤5.8ns 
Timebase Accuracy 
±50ppm 
Time Base Range 
2ns/div2000s/div 
Video Help 
 
SD Card 
 
Input Impendence 
1MΩ 
VOLTS/DIV Range 
2mV/div～5V/div 
A/D Converter 
8bit 
Position Range 
±50V(5V/div), ±40V(2V/div～500mV/div), 
DC Gain Accuracy 
±3% for Normal or Average acquisition mode, 5V/div to 10mV/div; 
Bandwidth Limit 
20MHz 
Trigger Types 
Edge, Video, Pulse, Slope, Over time, Alternative 
Trigger Source 
CH1, CH2 
Math 
+,,x,÷,FFT 
Cursor Measurement 
Voltage difference between cursors: △V; 
Auto Measuerment 
Frequency, Period, Mean, PkPk, Cycli RMS, Minimum, Maximum, Rise time, Fall Time, +Pulse Width, Pulse Width, Delay12Rise, Delay12Fall, +Duty, Duty, Vbase, Vtop, Vmid, Vamp, Overshoot, Preshoot, Preiod Mean, Preiod RMS, FOVShoot, RPREShoot, BWIDTH, FRF, FFR, LRR, LRF, LFR, LFF 
The float voltage between BNC and Ground 
600V CATIII, 1000V CAT II 
The float voltage between each Channel 
600V CATIII, 1000V CAT II 
The float voltage between Multimeter and Ground 
1000V 
between input Ports directly 
400V CAT II 
Input by 10:1 probe 
600V CATIII, 1000V CAT II 
DMM Max. Resolution 
6,000 Counts 
Testing Modes 
Voltage, Current, Resistance, Capacitance, Diode & Continuity 
Max. Input Voltage 
AC: 600V, DC: 800V 
Max. Input Current 
AC:10A , DC: 10A 
Max. Input Impandance 
10MΩ 
Display 
5.6" TFT 16K Color Display, 640*480 dots 
Size 
245mm x 163mm x 52mm 
Weight 
1.3KG(Without Package) 
Standard Probe 
P7150x2 
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.
Analog and digital oscilloscope in the observation of the details of the waveform, which has the advantage?
1. Which is more advantageous, analog or digital oscilloscope, in looking at the details of the waveform (e.g., looking at parasitic waveforms of less than 1% at zero and peak crossing)?
2. Digital oscilloscope generally provides online display of root mean square value, its accuracy is generally what?
Answer: 1) observe parasitic waveform of less than 1%. The observation accuracy is not very good either in analog oscilloscope or digital oscilloscope. The vertical accuracy of the analog oscilloscope may not be higher than that of the digital oscilloscope. For example, the vertical accuracy of the analog oscilloscope with a certain 500MHz bandwidth is ±3%, which is not more advantageous than that of the digital oscilloscope (usually the accuracy is 12%). Moreover, the automatic measurement function of the digital oscilloscope is more accurate than the manual measurement of the analog oscilloscope for details.