What is Oscilloscope Coupling?

There are two main forms of coupling, AC and DC that can be used with an oscilloscope channel.

• AC coupling is the most common type of coupling used with oscilloscopes. AC coupling is achieved by using a capacitor to block the DC component of the signal. This allows only the AC signal to be passed through to the oscilloscope. Coupling filters are typically used when measuring AC signals. The filter is a high-pass filter, which means that it will only allow signals above a certain frequency to pass through.
• DC coupling allows all components of the signal to pass through to the oscilloscope. This includes the DC component, AC component, and any other noise that may be present in the signal. DC coupling is used when you want to measure the average voltage of a signal. This is useful when you are trying to find the offset voltage of a signal. DC coupling is also useful when measuring signals that have a large amount of AC noise.

Oscilloscope ground coupling is the process of measuring signal voltage levels with respect to the ground. This setting temporarily disconnects the probes without physically having to remove them. This is useful when adjusting a signal, although it is rarely used in digital oscilloscopes.

This is where the oscilloscope is not connected to the ground. It's used when you want to measure the voltage between two points that are not at the same potential. For example, you might want to measure the voltage between two wires carrying current. Without floating coupling, the oscilloscope would measure the voltage relative to the ground, which would introduce error into the measurement.

Amplitude control is the process of controlling the amplitude, or height, of a waveform. Amplitude control is important because:

1. If the waveform is too large, it can damage the oscilloscope
2. If the waveform is too small, it is difficult to measure accurately

Amplitude control is typically achieved by using a variable attenuator. This works by reducing the amplitude of the waveform without affecting its shape.

Trigger settings are used to control the trigger, which is vital to ensure that the measurement is taken at the right time. The trigger settings allow you to specify the conditions that must be met for the trigger to fire. For example, you can select that the trigger should fire when the waveform crosses a certain threshold.

There are basic and advanced trigger settings. Basic trigger settings are sufficient for most measurements and can be easily changed. Advanced trigger controls are used for more complex measurements.

A coupling switch is a switch that is used to select the type of coupling. Coupling switches are typically used to select between AC coupling and DC coupling. The switch may also be used to select between ground coupling and floating coupling.

The switch function works by allowing or blocking the passage of current. When the switch is in the AC position, it will enable only the AC component of the signal to pass through to the oscilloscope. When the switch is in the DC position, it allows all signal components to pass through.

• Allows you to select which component of the signal you want to measure
• Helps to protect your oscilloscope from damage
• It allows you investigate how a circuit is operating without affecting its normal operation
• Can measure the strength of the signal, or the amplitude, without affecting the waveform

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