(2)
Differences in results of measurement with circuit testers
Forward voltage
(v
I
The circuit tester power supply voltage depends on the
tester type:
1.5
V,
3.0
V
and 6.0
V.
The resistance of a semiconductor such as a diode varies
with the circuit tester power supply voltage.
Diode characteristics are shown in the figure to the left.
The resistance values of the same diode measured with
two types of circuit testers having different power supply
voltages are different.
This manual describes the results of measurement with
an analog circuit tester with a power supply voltage of 3.0
v.
(3) Differences in results of measurement by measurement range.
3
Variable resistor
0
G
Resistor
i,ay
Voltage: 1.5 V
lo
"6
Red
3
Black
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 according to
the measurement range.
Always use the range described in the repair manual for
measurement.
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