Most oscilloscopes use two basic sweep modes:
Posted: Tue Feb 18, 2025 4:16 am
Oscilloscopes are divided into single-channel and multi-channel (2, 4, 6, etc. channels at the input). Multi-channel oscilloscopes allow you to simultaneously observe several signals on the screen, measure their parameters and compare them with each other.
The input signal of each channel is fed to its own input "Y" loan data amplified by its own vertical deflection amplifier to the level required for the operation of the CRT deflection system (tens of volts) or an analog-to-digital converter. The vertical deflection amplifier is always built according to the DC amplifier (DCA) scheme, i.e. it has a lower operating frequency of 0 Hz. This allows measuring the DC component of the signal, correctly displaying asymmetric signals relative to the zero line, and measuring DC voltage. This operating mode is called the open input mode.
However, if it is necessary to cut off the constant component (for example, it is too large and takes the beam beyond the screen boundaries), the amplifier can be switched to a closed input mode (the input signal is fed to the DC amplifier through a separating capacitor).
Sweep control
automatic (self-oscillating);
waiting.
Some models have another mode:
one-time.
Automatic unfolding
During automatic sweep, the sweep generator operates in a self-oscillating mode, therefore, even in the absence of a signal, at the end of the sweep cycle - the cycle of the sawtooth sweep generator, its next start occurs, this allows you to observe the image on the screen even in the absence of a signal or when applying a constant voltage to the vertical deflection input. In this mode, many oscilloscope models capture the sweep generator frequency by the signal being studied, while the sweep generator frequency is an integer number of times lower than the frequency of the signal being studied.
The input signal of each channel is fed to its own input "Y" loan data amplified by its own vertical deflection amplifier to the level required for the operation of the CRT deflection system (tens of volts) or an analog-to-digital converter. The vertical deflection amplifier is always built according to the DC amplifier (DCA) scheme, i.e. it has a lower operating frequency of 0 Hz. This allows measuring the DC component of the signal, correctly displaying asymmetric signals relative to the zero line, and measuring DC voltage. This operating mode is called the open input mode.
However, if it is necessary to cut off the constant component (for example, it is too large and takes the beam beyond the screen boundaries), the amplifier can be switched to a closed input mode (the input signal is fed to the DC amplifier through a separating capacitor).
Sweep control
automatic (self-oscillating);
waiting.
Some models have another mode:
one-time.
Automatic unfolding
During automatic sweep, the sweep generator operates in a self-oscillating mode, therefore, even in the absence of a signal, at the end of the sweep cycle - the cycle of the sawtooth sweep generator, its next start occurs, this allows you to observe the image on the screen even in the absence of a signal or when applying a constant voltage to the vertical deflection input. In this mode, many oscilloscope models capture the sweep generator frequency by the signal being studied, while the sweep generator frequency is an integer number of times lower than the frequency of the signal being studied.