What is voltage transmission?

What is voltage transmission?

• A. A system where the transmitter regulates current.
• B. A system where the transmitter uses optical signals.
• C. A system where the transmitter modulates resistance.
• D. A system where the transmitter regulates voltage.

Answer: (D)

Voltage transmission means the transmitter outputs a voltage that directly represents the measured value, and the receiving device reads that voltage across a defined input impedance. The transmitter actively regulates the voltage level on the line rather than controlling the current through the loop. This contrasts with current transmission, where the signal is carried by loop current (the transmitter modulates current, and a resistor or input converts that current to a readable signal). In voltage transmission, the signal integrity depends on maintaining a stable voltage and a suitable input impedance, whereas in current transmission the voltage across the line can vary with supply and line resistance. The rationale is that voltage transmission is defined by controlling and sending a voltage signal, not a controlled current. The other approaches describe different signaling methods (optical signals, or changing resistance), which do not define voltage-based signaling.

Voltage transmission means the transmitter outputs a voltage that directly represents the measured value, and the receiving device reads that voltage across a defined input impedance. The transmitter actively regulates the voltage level on the line rather than controlling the current through the loop. This contrasts with current transmission, where the signal is carried by loop current (the transmitter modulates current, and a resistor or input converts that current to a readable signal). In voltage transmission, the signal integrity depends on maintaining a stable voltage and a suitable input impedance, whereas in current transmission the voltage across the line can vary with supply and line resistance.

The rationale is that voltage transmission is defined by controlling and sending a voltage signal, not a controlled current. The other approaches describe different signaling methods (optical signals, or changing resistance), which do not define voltage-based signaling.