Model: DSO 5202-P
Real Time sample rate: 1GSa/s
Display: Large (7.0-inch) color display
Innovative on screen HELP system
Sample Rate Range: 500MS/s--1GS/s
Record Length: 40K
FFT:Windows: Hanning, Flatop, Rectamgular, Bartlett, Blackman; 1024 sample point
Low Frequency Response (-3db):≤10Hz at BNC
Trigger mode: Auto, Normal, Single
Trigger type: Edge, Video, Pulse, Slope, Over time, Alternative
USB host and device connectivity, standard (note: USB port is NOT intended to be used to recharge cell phones or other usb charged devices.)
Multiple automatic measurements
Four math functions, including FFTs standard
Provides software for PC real-time analysis
Determine the bandwidth of the test signal to select the oscilloscope
Bandwidth is generally defined as the frequency when the amplitude of sinusoidal input signal attenuates to -3db, that is, 70.7% of the amplitude. The bandwidth determines the basic measuring ability of oscilloscope to signal. If there is not enough bandwidth, the oscilloscope will not be able to measure the high frequency signal, the amplitude will be distorted, the edge will disappear, the detail data will be lost;Without sufficient bandwidth, all the features of the resulting signal, including ringing and ringing, are meaningless.
An effective rule of thumb for determining the bandwidth of an oscilloscope you need -- the "5x rule of thumb" : multiply the highest frequency component of the signal you are measuring by 5, so that the measurement results are more than 2% accurate.
In some applications, you do not know the bandwidth of the signal of interest to you, but you do know its maximum rise time, at which time the frequency response calculates the associated bandwidth and rise time of the instrument using the following formula: Bw=0.35/maximum rise time of signal.
There are two types of digital oscilloscope bandwidth: repeat (or equivalent time) bandwidth and real-time (or single time) bandwidth. Repeat bandwidth only applies to repeated signals, showing sampling from multiple signal acquisition periods. Real-time bandwidth is the highest frequency that can be captured in the single sampling of oscilloscope, and it is more important when the captured events are not frequent or transient signals. Real-time bandwidth is closely related to the sampling rate.
The higher the bandwidth, the better, but higher bandwidth often means higher prices, so choose the frequency component of the signal you're looking at on a budget.
Under what circumstances should oscilloscope consider the sampling rate?
The bandwidth is dependent on the object under test. You want the minimum sampling interval (the inverse of the sampling rate) to capture the signal details you need, provided the bandwidth is satisfied. There are some empirical formulas about sampling rate in the industry, but basically they are all based on oscilloscope bandwidth, in practical application, it is best not to use oscilloscope to measure the same frequency signal. When selecting the type, the bandwidth of the oscilloscope should be more than 3 times that of the measured sinusoidal signal, and the sampling rate should be 4 to 5 times that of the bandwidth, which is actually 12 to 15 times that of the signal.For other waveforms, ensure that the sampling rate is sufficient to capture signal details. If you are using an oscilloscope, you can verify that the sampling rate is sufficient by stopping the waveform, amplifying the waveform, and if there is any change in the waveform (such as some amplitude), the sampling rate is insufficient, otherwise it will be ok. Point displays can also be used to analyze the adequacy of the sampling rate.