When a circuit is called compensated attenuator?

When a circuit is called compensated attenuator?

Transfer function is directly proportional to the frequency. Transfer function is inversely proportional to the frequency. Transfer function is independent of the frequency.

What is compensated attenuator?

A compensated attenuator is a simple two-port network providing fixed voltage attenuation over a wide frequency band. Such networks are used where precision measurements voltage are required, particularly when the signal is not sinusoidal.

What are the function of compensated attenuator and delay line in the vertical deflection system of the oscilloscope?

A Compensated Attenuator is a simple two port network which provides a constant attenuation over a wide range of frequencies. Here I am explaining attenuators and compensation in the input of vertical deflection amplifiers used in oscilloscopes for the sake of explanation.

Why does a resistive attenuator need to be compensated?

The purpose of a compensated attenuator is to provide a uniform attenuation factor for all frequencies. This must be done with a flat response across the frequency range. To achieve this the scaling resistance is shunted with a capacitor to compensate for the capacitance present at the input of the system.

What is the condition for an RC divider to be compensated?

To have the same ½ divider ratio for the capacitors, then C1 must be equal to C2. Figure 3. A frequency compensated divider. The compensated divider employs pole-zero cancellation to suppress undesired frequency dependence caused by any stray capacitance on the output side of the network.

Why resistive attenuators are to be compensated and where are they used?

Attenuators are designed to change the magnitude of the input signal seen at the input stage, while presenting a constant impedance on all ranges at the attenuator input. A compensated RC attenuator is required to attenuate all frequencies equally.

How do you install a capacitor?

To calculate the total overall capacitance of a number of capacitors connected in this way you add up the individual capacitances using the following formula: CTotal = C1 + C2 + C3 and so on Example: To calculate the total capacitance for these three capacitors in parallel.

What can a oscilloscope measure?

An oscilloscope measures voltage waves. Remember as mentioned earlier, that physical phenomena such as vibrations or temperature or electrical phenomena such as current or power can be converted to a voltage by a sensor. One cycle of a wave is the portion of the wave that repeats.

How is an uncompensated attenuator connected to an amplifier?

The above circuit shows uncompensated attenuator connected to the input of vertical deflection amplifier. It will provide different attenuations as per the selected input voltage range. The equivalent input capacitance of the amplifier C1 is about 10pF, which includes stray capacitance, parasitic capacitance etc.

What is the circuit for a probe with compensation?

The circuit for a basic probe with compensation is shown above, and below it the circuit. It should be stressed that this is a first order representation as there are many small spurious levels of capacitance, resistance and inductance.

What is the equivalent capacitance of an amplifier C1?

The equivalent input capacitance of the amplifier C1 is about 10pF, which includes stray capacitance, parasitic capacitance etc. So we need to account the capacitive reactance of C1 ( 1/2πFC) while calculating the input impedance of the amplifier.

Can a high bandwidth probe compensate for lower input capacitance?

High bandwidth probes tend to only compensate for lower input capacitance levels – as this is what a high bandwidth scope may have. It is no use trying to use a scope probe with a compensation range of 8 – 18pF for example with a scope that has an input capacitance of 25 pF.