How to use a multimeter to measure the quality of the secondary and triode of the solid technetium components and

n the process of electronic practice, we often need to test diodes and triodes. Let's talk about their general test methods.

It is summarized as two stages: (red and black are when the red and black test leads of the multimeter are normally connected to the multimeter)

Diode test method:

First assume that the positive and negative poles are connected, and the black positive and red negative are connected.

The reading is one big and one small, (big: close to infinity; small: PN junction forward resistance from hundreds to thousands of ohms)

The hour assumption holds. (Black positive and red negative)

NPN transistor test method (for PNP, swap black and red pens):

Assume that a base is connected and the black pen is connected.

The other two poles of the red pen are valid if both are small. (Little finger PN forward resistance)

There should be three conclusions:

Type lumber and base.

C must assume that black C and red connect to E.

B, C plus offset, the most suitable for fingers.

If the resistance is small, the hypothesis holds.

"Type" means "NPN" or "PNP";

"Material" means "material";

"Base" means "base".