Types and functions of oscilloscopes
Oscilloscopes can be divided into two main categories: analogue oscilloscopes and digital oscilloscopes.
Analogue oscilloscopes display the measured signal in a continuous manner....
Digital oscilloscopes will first be measured signal sampling and quantisation, into a binary signal storage, and then from the storage device to remove the discrete value of the signal, through the algorithm will be discrete measured signal in the form of a continuous display on the screen.
The role of oscilloscope trigger adjustment
When the trigger is not adjusted properly, the displayed waveform will appear unstable. The so-called waveform instability refers to the waveform left and right movement can not stop on the screen, or, there are multiple waveforms intertwined together, can not clearly display the waveform.
Trigger adjustment is a difficult and error-prone point of oscilloscope operation, the key to trigger part of the adjustment is to correctly select the trigger source signal.
Trigger source selection principles
When testing a single channel, the trigger source must be the same as the channel where the signal under test is located, for example, the trigger source must be CH1 when testing the Y channel CH1, otherwise the waveform will be unstable.
When two signals of the same frequency are tested, the strongest one should be selected as the trigger source.
For two signals with integer multiple frequency relationship, the one with lower frequency should be selected as the trigger signal source.
Two signals that do not have an integer multiple frequency relationship cannot be displayed stably at the same time unless they are stored.
The Role of Calibration Signal
The oscilloscope provides a calibration signal with a frequency of 1KHZ and a voltage of 3V:
① It can be used to check whether the measurement of the oscilloscope itself is accurate.
② It can be used to check whether the input probe is intact.
③ When using the comparison method to measure other signals, a standard is used as a reference signal.
