Enter the measured output voltage (volts), the module gain (V/V), and the full-scale range (volts) into the calculator to determine the Thermocouple Input Voltage. 

Thermocouple Input Voltage Formula

The following formula is used to calculate the Thermocouple Input Voltage.

Vt = Vo / G + FSR
  • Where Vt is the Thermocouple Input Voltage (volts)
  • Vo is the measured output voltage (volts) 
  • G is the module gain (V/V) 
  • GSR is the full-scale range (volts) 

To calculate the Thermocouple Input Voltage, divide the output voltage by the module gain, then add the full-scale range.

How to Calculate Thermocouple Input Voltage?

The following example problems outline how to calculate Thermocouple Input Voltage.

Example Problem #1

  1. First, determine the measured output voltage (volts). In this example, the measured output voltage (volts) is determined to be 120 .
  2. Next, determine the module gain (V/V). For this problem, the module gain (V/V) is measured to be 52 .
  3. Next, determine the full scale range (volts). In this case, the full scale range (volts) is found to be .003.
  4. Finally, calculate the Thermocouple Input Voltage using the formula above: 

Vt = Vo / G + FSR

Inserting the values from above and solving yields: 

Vt = 120 / 52 + .003 = 2.31 (volts)


What is a thermocouple and how does it work?

A thermocouple is a sensor used to measure temperature. It consists of two different types of metals, joined together at one end. When the junction of the two metals is heated or cooled, a voltage is created that can be correlated back to the temperature. The thermocouple measures this voltage and, using known properties of the materials, can calculate the temperature at the junction.

Why is module gain important in calculating Thermocouple Input Voltage?

Module gain, expressed as V/V, indicates how much the output voltage is amplified from the input voltage. It’s crucial in calculating the Thermocouple Input Voltage because it directly affects the accuracy of the voltage measurement. Without accurately accounting for the module gain, the calculated input voltage, and thus the temperature measurement, could be significantly off.

How does the full-scale range (FSR) impact the calculation of Thermocouple Input Voltage?

The full-scale range (FSR) represents the maximum output voltage range of the thermocouple module. It’s an essential factor in calculating the Thermocouple Input Voltage because it helps in determining the upper limit of voltage that can be accurately measured. Including the FSR in calculations ensures that the input voltage is correctly adjusted for any inherent offsets or scaling factors in the measurement system.