1. What is the NTC Thermistor Equation?

The NTC (Negative Temperature Coefficient) thermistor equation describes how the resistance of a thermistor changes with temperature. It's widely used in temperature sensing applications.

2. How Does the Calculator Work?

The calculator uses the NTC thermistor equation:

Where:

• \( R \) — Measured resistance (Ω)
• \( R_0 \) — Resistance at reference temperature (Ω)
• \( B \) — B-value (K), material constant
• \( T \) — Calculated temperature (K)
• \( T_0 \) — Reference temperature (K)

Explanation: The equation shows the exponential relationship between resistance and temperature in NTC thermistors.

3. Importance of NTC Thermistor Calculations

Details: Accurate temperature calculation from resistance is crucial for temperature monitoring systems, thermal protection circuits, and temperature compensation applications.

4. Using the Calculator

Tips: Enter all resistance values in ohms (Ω), B-value in kelvin (K), and temperatures in kelvin (K). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical B-value for NTC thermistors?
A: Common B-values range from 2000K to 5000K, depending on the thermistor material and temperature range.

Q2: Can I use this calculator for PTC thermistors?
A: No, this equation is specific to NTC thermistors. PTC thermistors have different resistance-temperature characteristics.

Q3: How accurate is this calculation?
A: The accuracy depends on the precision of your B-value and reference measurements. For highest accuracy, use manufacturer-provided values.

Q4: What's the difference between K and °C in these calculations?
A: The equation requires absolute temperature in Kelvin. To convert from °C: K = °C + 273.15.

Q5: Why does resistance decrease with temperature in NTC thermistors?
A: In NTC materials, increased temperature provides more thermal energy for charge carriers, reducing resistance.