// Block 1: Calculate Beta
function calculateBeta() {
const R1 = parseFloat(document.getElementById(“r1”).value) * parseFloat(document.getElementById(“r1_unit”).value);
const R2 = parseFloat(document.getElementById(“r2”).value) * parseFloat(document.getElementById(“r2_unit”).value);
const T1 = parseFloat(document.getElementById(“t1”).value) + 273.15; // Convert to Kelvin
const T2 = parseFloat(document.getElementById(“t2”).value) + 273.15;

if (!R1 || !R2 || !T1 || !T2 || T1 === T2) {
document.getElementById(“beta_result”).innerText = “⚠️ Please enter valid inputs.”;
return;
}

const beta = (Math.log(R1 / R2)) / ((1 / T1) – (1 / T2));
document.getElementById(“beta_result”).innerText = `✅ Beta = ${beta.toFixed(2)} K`;
}

// Block 2: Calculate Resistance or Temperature
function calculateNTC() {
const beta = parseFloat(document.getElementById(“beta”).value);
const R0 = parseFloat(document.getElementById(“r0”).value) * parseFloat(document.getElementById(“r0_unit”).value);
const R = document.getElementById(“r”).value ? parseFloat(document.getElementById(“r”).value) * parseFloat(document.getElementById(“r_unit”).value) : NaN;
const T = document.getElementById(“t”).value ? parseFloat(document.getElementById(“t”).value) + 273.15 : NaN; // Kelvin

let result = “”;

if (!beta || !R0) {
document.getElementById(“ntc_result”).innerText = “⚠️ Please enter Beta and reference resistance.”;
return;
}

if (!isNaN(R) && isNaN(T)) {
// Calculate Temperature
const tempK = 1 / ((1 / (25 + 273.15)) + (1 / beta) * Math.log(R / R0));
const tempC = tempK – 273.15;
result = `Temperature = ${tempC.toFixed(2)} °C`;
} else if (!isNaN(T) && isNaN(R)) {
// Calculate Resistance
const resistance = R0 * Math.exp(beta * ((1 / T) – (1 / (25 + 273.15))));
result = `Resistance = ${resistance.toFixed(2)} Ω`;
} else {
result = “⚠️ Please fill only one of Resistance or Temperature.”;
}

document.getElementById(“ntc_result”).innerText = `✅ ${result}`;
}

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