0-14 2. Difference in result of measurement with circuit tester The circuit tester power supply voltage depends on the tester type. 1.5 V, 3.0 V or 6.0 V is used. The resistance of a semiconductor such as a diode varies with the circuit tester power supply voltage. The diode characteristics are shown in the figure below. The resistance values of the same semiconductor measured with two types of circuit testers having different power supply voltages are different. (mA) 6 Forward current 5 3 4 Germanium diode This manual describes the results of measurement with a circuit tester whose power supply voltage is 3.0 V. 2 Silicon diode 1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 (V) Forward voltage 3.
Difference in measurement result by measurement range (analog type) In the analog type circuit tester, changing the measurement range switches over the internal circuit to vary the circuit resistance. Even when the same diode is measured, the measurement result varies with the measurement range. Always use the range described in the repair manual for measurement. Resistor Meter Current flow 0 Ω Variable resistor Resistor Range: Ч 10 (SW1) Resistor Range: Ч 1 Power source: 1.5V Red Black