Measurement of transistor and MOS tube with digital multimeter

The following is the structure of the transistor and the various identification methods in the circuit diagram

When the multimeter is measured against the transistor (buzzer), we first determine which foot is the B-pole. With a red pen touch any one of the feet, the black pen to contact the other two feet, if you can measure the two groups of similar and less than 1 of the number, indicating that the Red pen contact is the B pole. If the two sets of numbers are not similar, it means that the red pen is not touching the B-pole should be the red pen for a foot, black pen to test the other two feet until the B pole is found. If we know which foot is B-pole, how to judge the other two feet which is C-pole and e-pole? The following figure:

The Red Pen is a B-pole. The black pen measured two sets of similar data in the other two, one of which was slightly larger, and the foot was an e-pole, and the small one was a C-pole. And we know this tube is an NPN transistor because the red pen is in B pole! The same is true for PNP transistor measurements, except that the black pen is in the B pole, the red pen touches the other two sets of similar data, as shown below:

The following is a method for measuring the field effect tube. Field effect tube abbreviation for FET, can be divided into junction FET (JFET) and insulated gate type FET (MOSFET), we are generally referred to as MOS tube, and MOS tube can be divided into enhanced and exhausted type and our normal motherboard is commonly used in the use of the enhanced MOS tube.
The following figure identifies the MoS tube:

Our motherboard commonly used in the MOS tube GDS three pin is fixed, whether it is N-channel or P-channel are the same, the chip is left to right, respectively, the G-pole D-Pole s pole! The following figure:

The order of measurement is:
1. Using the diode file to measure the MoS tube, the first thing to do is to short three pins to discharge the tube, and then use the Red Watch pen to connect the S pole, the Black Watch pen to the D pole. If the measured value is more than 500, it indicates that the tube is N-Channel.

2. Black pen does not move, with red pen to contact G-Pole measured value of 1.

3. The red pen moves back to the S pole, at which point the tube should be conduction.

4. Then the Red Pen Test D pole, and the black pen to measure s pole, should be measured to a value of 1. (This step should be noted.) because the voltage of the G-pole 2.5V meter is given before the measurement, the DS is still conduction. However, about 10 seconds after the return to normal, it is recommended to carry out this step in the first short three pin to the discharge of the tube.

5. Then the red pen does not move, the black pen to test the G pole, the value should be 1.

To this we can determine that the N Ditch dojo pipe is normal, some people say the next two steps can omit contingency, but I habitually put five steps full use, personal habits problem!!! Of course, the measurement of the P-channel is the same, but the first step for the Black Watch pen test s pole, the Red pen Test D pole, you can measure more than 500 of the value.

My understanding of the knot is that the D-pole and S-pole are conduction between the measurements, and if the red-form pen is connected to the G-pole, the black-out pen should be able to reach the DS pole respectively to measure the two groups of similar values, this tube is N-Channel. If the black-form pen is connected to the G-pole, the red pen should be able to reach the DS pole respectively to measure two groups of similar values, this tube is P-Channel. Do not know whether this understanding, but also please understand the friends to help the solution. Thank you.