Ten common problems with oscilloscopes
I. What is oscilloscope bandwidth? When buying, how do we decide to buy what bandwidth oscilloscope?
Answer: Oscilloscope bandwidth refers to the frequency value of a sinusoidal input signal attenuated to 70.7% of its actual amplitude, i.e., the -3dB point, based on a logarithmic scale. (The higher the bandwidth, the more accurate the signal reproduction. Without sufficient bandwidth, the oscilloscope will not be able to distinguish high frequency variations. Amplitude will be distorted, edges will disappear, and detail data will be lost. If there is not enough bandwidth, all the characteristics of the signal, such as ringing and ringing, etc. are meaningless).
Second, the real-time sampling rate is the larger the better?
A: The larger the better.
Third, in what case the test needs to be the oscilloscope's power supply ground is not connected?
A: The ground of the signal under test is common to the ground of the external power supply line of the oscilloscope.
What kind of signals are the various triggering modes of the oscilloscope suitable for testing?
A: Video triggering is suitable for testing standard video signals, edge triggering is suitable for testing ordinary stable signals with rising or falling edges, and pulse triggering is suitable for testing synchronous signals mixed with serious interference signals.
V. How to test small burr signals with oscilloscope?
A: The oscilloscope will be played in the automatic test, the same as Hui's oscilloscope will be able to automatically measure the small burr signal.
Sixth, the oscilloscope bandwidth is the maximum test frequency?
A: No, the oscilloscope bandwidth is at least (2-5) times the frequency of the fastest signal to be measured.
VII. Is the voltage of the waveform tested by the oscilloscope the true RMS value?
A: No.
VIII. What is the relationship between the storage depth and sampling rate of an oscilloscope?
A: Depth of storage = Sampling rate × Sampling time
Is the storage depth of the oscilloscope the same as the memory of the instrument?
A: No.
What is the minimum bandwidth requirement of the oscilloscope for 1M sine wave and triangle wave?
A: The oscilloscope with the same benefit is at least 25M.
