Which device receives and transmits signals from 0-1 volts?

Which device receives and transmits signals from 0-1 volts?

• A. Head box
• B. Power box
• C. AC amplifier
• D. DC amplifier

Answer: (D)

Preserving the direct current (DC) content of a signal is what this item is testing. A DC amplifier is designed to pass signals that include or start at zero frequency, meaning it can handle and transmit the baseline and very slow changes without removing them. Because of that, it can process signals that sit in the 0–1 volt range without distorting their DC level or slow drift, which is essential when those slow components carry meaningful information. In contrast, an AC amplifier purposely blocks DC by coupling through capacitors, so it would strip out the zero-frequency component and any slow baseline shifts. That makes it unsuitable when you need to maintain the full signal, including any DC offset, as it would alter the measurement and interpretation of very slow or steady changes. The head box and power box have different roles—the head box interfaces with the patient’s leads, and the power box supplies energy to the equipment—whereas the DC amplifier’s job is specifically to receive and transmit the signal without losing its DC content.

Preserving the direct current (DC) content of a signal is what this item is testing. A DC amplifier is designed to pass signals that include or start at zero frequency, meaning it can handle and transmit the baseline and very slow changes without removing them. Because of that, it can process signals that sit in the 0–1 volt range without distorting their DC level or slow drift, which is essential when those slow components carry meaningful information.

In contrast, an AC amplifier purposely blocks DC by coupling through capacitors, so it would strip out the zero-frequency component and any slow baseline shifts. That makes it unsuitable when you need to maintain the full signal, including any DC offset, as it would alter the measurement and interpretation of very slow or steady changes.

The head box and power box have different roles—the head box interfaces with the patient’s leads, and the power box supplies energy to the equipment—whereas the DC amplifier’s job is specifically to receive and transmit the signal without losing its DC content.