Encuentre la base b, ¿cuál de los otros dos electrodos es el colector c y cuál es el emisor e? En este momento, podemos usar el método de medición de la corriente de penetración ICEO para determinar el colector c y el emisor e.
(1) For NPN type triode, the measurement circuit of penetration current. According to this principle, use the black and red test pens of the multimeter to measure the forward and reverse resistances Rce and Rec between the two poles upside down. Although the deflection angle of the multimeter pointer is very small in the two measurements, if you observe carefully, there will always be a deflection. If the angle is slightly larger, the current flow must be: black test lead → c pole → b pole → e pole → red test lead, the current flow is exactly the same as the arrow direction in the triode symbol, so the black test lead is connected at this time. It is the collector c, and the red test pen must be connected to the emitter e.
(2) For the PNP type triode, the principle is also similar to the NPN type, and its current flow must be: black test lead → e pole → b pole → c pole → red test lead, and the current flow is also consistent with the direction of the arrow in the triode symbol. Therefore, at this time, the black test lead must be connected to the emitter e, and the red test lead must be connected to the collector c.
