Test Instruments & Measuring Devices
As the resistance was increased from 0 to 5W, meter current decreased by 42 µA.
Similarly, when resistance was increased from 5 to 10W, the current decreased by
33 µA. Thus, an ammeter scale used to measure resistance is nonlinear (Figure
10). The ohm meter scale is a reversal of the ammeter and voltmeter scales. In
other words, the zero resistance (Rx = 0) is at the right end of the scale and
infinite resistance (Rx = 1 MW) is at the left end of the scale.
Figure 10 Ohm Meter Scale
Ohm meters are summarized below.
Ohm Meter Summary
Measures circuit resistance
Connected to a component removed from the circuit