The insertion of the test leads is the same as above; the principle is the same as that of the diode. Assume that pin A is the base, connect it with the black pen, and the red pen and the other two pins are in contact with the other two pins; if the two readings are about 0.7V, then connect the red pen to pin A, and the black pen Contact the other two pins, if both display "1", then A pin is the base, otherwise it needs to be re-measured, and this tube is a PNP tube. So how to judge the collector and emitter? The digital watch cannot be judged by the swing of the pointer like the pointer watch, so what should we do? We can use the "hFE" gear to judge: first turn the gear to the "hFE" gear, you can see that there is a row of small jacks next to the gear, which are divided into PNP and NPN tube measurements. The tube type has been determined before, insert the base electrode into the "b" hole of the corresponding tube type, and insert the other two pins into the "c" and "e" holes respectively. At this time, the value can be read, that is, the value; then fix the base electrode, and the rest Swap the two pins; compare the two readings, the pin with the larger reading corresponds to the surface "c", "e".
Tips: The above method can only directly measure small tubes such as 9000 series. If you want to measure large tubes, you can use the wiring method, that is, use small wires to lead out the three pins. It's so much more convenient.
GVDA Digital Multimter GD118B Blue color :
Pls Clink Below Photo and Read more details about this Multímetre digital GVDA GD118B Color blau:
