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The measured forward voltage is 0.644 V.
To test the second diode (B - C), we need to connect the black probe to the cathode which is the
base of the transistor and connect the red probe to the anode which is the collector of the transistor.
The measured forward voltage in this figure is 0.647 V.
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Mastering the Art of Measurement (DM401B Smart Digital Multimeter) r.01 www.plusivo.com