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h
Measurement
FE
Figure 8 shows a simplified diagram of the h
the X10 ohms position and the transistor circuit takes the place of the external resistor in the ohms measurement.
The higher the h
of the transistor, the more current flows in the external circuit and the lower the effective
FE
resistance. The meter reads this resistance and the h
Figure 8
Battery Test
Figure 9 shows a simplified diagram of the battery measuring circuit. The battery voltage is measured under a
0.25A load.
Figure 9
Buzzer Test
Figure 10 shows a simplified diagram of the audio continuity circuit. When a 20Ω load or less is place across
the terminals, transistor Q3 conducts and allows Q3 to oscillate.
Figure 10
DC NULL Test
Figure 11 shows a simplified diagram of the DCV (NULL) circuit. The meter is set to 0 on the DCV (NULL) scale.
Positive or negative voltage applied to the terminals causes the meter to swing in either direction.
Figure 11
measuring circuit for PNP transistor. Here the range switch is in
FE
of the transistor may be read on the h
FE
-17-
scale.
FE
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