Most of the meters used for measuring electric signals employ currents detection as their basic indicating mode. An ammeter measure the currents flowing between two terminals sharing the same voltage potential within an electric circuit. The ammeter is connected in between (i.e., in series with) the two terminals as shown in figure 8(a). This measurement can be achieved only if the current can flow through the ammeter. Therefore, the ideal ammeter should act as a short circuit (i.e., Rin = 0 where Rin is the internal resistance of the meter) since it should not modify the circuit characteristics. The voltmeter is connected in parallel with the portion of the circuit between the pair (Rin = .). An ohmmeter is usually embedded within a voltmeter; hence, it is connected in parallel with the resistance to be measured.