Why is the ohmmeter uneven
The circuit is simple and the resistance is easy to calculate:
Formula 2R.x = Uv / I
The circuit in Figure 2 has a serious problem. If we measure a very small resistance, e.g. 0.1Ω, then a very high current flows which could destroy the ammeter. A protective resistor is therefore built in.
In the event of a short circuit, Rx= 0Ω, the maximum current through the resistor R1 limited. R.1 is chosen so that the ammeter fully deflects. With a supply voltage of 5V and a maximum current in the ammeter of e.g. 1mA, R would be1= 5V / 1mA = 5kΩ.
The resistance Rx can be calculated with it
Formula 3R.x = (Uv / I) - R1
Formula 3 contains a division and a subtraction.
Simple analog measuring devices are overwhelmed by this, so the problem is left to us humans
The values of the measured resistance are simply entered on the scale of an analog ohmmeter. At 0Ω the ammeter deflects fully, i.e. to the right. If the resistance is very high, only a small current flows and the pointer is on the left.
We only consider the lower scale for Ω
- The values are plotted unevenly
- The values can be estimated more than they can be read.
- But the values 1kΩ and 110Ω can be distinguished from each other.
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