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--- projects:electronics:weller:wxp80_reverse_engineer:analog_measurements [2018/05/15 00:30] – admin
+++ projects:electronics:weller:wxp80_reverse_engineer:analog_measurements [2018/05/15 00:39] (current) – [WXP80 analog measurements] admin
@@ Line 1: / Line 1: @@
 ====== WXP80 analog measurements ======
-This page shows the analog measurements of the WXP80 heating element connected to an operation amplifier. From the results a formula is calculated to model this.
+This page shows the analog measurements of the WXP80 heating element connected to an operational amplifier. From the results a formula is calculated to model this.
 ===== PTC resistance and voltages WXP80 =====
@@ Line 54: / Line 54: @@
 where $\begin{align*}T\end{align*}$ is the temperature in °C and $\begin{align*}R\end{align*}$ the resistance of TH1 in Ω.
-Please note that libre office offers an easy method to acquire this equation directly, using the 'show equation' option. It will show equation (2) right away:\\
+Please note that libre office calc offers an easy method to acquire this equation directly, using the 'show equation' option. It will show equation (2) right away:\\
 The opamp is configured as a DC coupled non-inverting amplifier with a bias. To calculate the gain (G) and bias (Vb), we use following equations:\\
@@ Line 61: / Line 61: @@
 where $\begin{align*}R3\end{align*}$ = 4.3kΩ, $\begin{align*}R4\end{align*}$ = 33.0kΩ, $\begin{align*}R5\end{align*}$ = 47Ω and $\begin{align*}R6\end{align*}$ = 1.0MΩ\\
-The bias voltage is a simply voltage divider with $\begin{align*}R3\end{align*}$ and $\begin{align*}R5\end{align*}$:
+The bias voltage is a simple voltage divider with $\begin{align*}R3\end{align*}$ and $\begin{align*}R5\end{align*}$:
 $V_b = V_{dd} \frac{R5}{R5 + R3} = 4.66 \frac{47}{47 + 4300} = 0.0501 \tag{4}$\\