The fuse resistor refers to an appearance
similar to a resistor. Some products are marked with a color ring to
distinguish the size of the current, so they are named fuse resistors and PICO
fuses.
Below we introduce in detail the definition
and classification of fuse resistors, the functions of fuse resistors, and how
to judge the quality of fuse resistors.
Definition
Of Fuse Resistor:
The so-called fuse resistor means that the
resistor and the fuse are similar in material and structure, and the fuse
resistor has the functions of both. It can be used as a resistor in normal
times. Once the current is abnormal, it will play the role of a fuse to protect
it.
Classification
Of Fuse Resistors:
Metal film fuse resistors, wire wound resistors, cement
resistors. There are several types of power: 1/4W, 1/2W, 1W, and 2W. As
the power increases, the appearance size of the product will continue to
increase.
It can be divided according to size: 2*6
mm, 2.4*7mm, 3*9mm, 2.5*6mm, etc. The color of the product body is green
and yellow, as shown in the picture.
Among them, the appearance of 2*6 mm and
3*9mm fuse resistors is marked with a color ring to distinguish the size of the
current.
SMD FUSE
A fuse is a very thin
wire; the function of fuses is to stop higher than normal current from flowing
through an electronic circuit.
It is designed to
protect electronic components from being damaged, fuse come in different sizes
and shapes. A fuse is labeled as (F) in a motherboard.
SMD Fuse symbolized on
Motherboard & Schematic diagram with the letter F and sometimes symbolized
with two letters like PF, FP and next to it is a number
The Role
Of The Fuse Resistor:
The resistance of the fuse resistor is generally small, most
of which are less than 1 ohm. They often play the role of a sampling resistor
in the circuit. They also play a role when a surge occurs, or other large
currents are generated and the line needs to be protected. Fuse breaks the
circuit to provide protection.
How To Judge The Quality Of
The Fuse Resistance:
Use a Multimeter to set the fuse to the ohm
level, and use test leads to test both ends. If the resistance value is the
same as the nominal value, it is good. If it becomes larger or infinite, it is
bad. Damaged resistors will not increase their resistance.
If the fuse resistor is bad, follow the
replacement principle of the same power when replacing the fuse resistor.
SMD Fuse Testing Method
Touch the probes to
both end of the fuse. You can check the fuse while it still in Motherboard or
out of Motherboard.
A good fuse reading
should show continuity or read ZERO ohms.
A bad fuse is open
which will not show any reading on your meter. You may also set to the buzzer
range to test a fuse with digital meter.
If the fuse is ok, the
buzzer will sound and if the fuse is damage there will be no sound.
The red and black test probes can be either way when testing fuse
Download Link - Fuse Resistor PDF Download
No comments:
Post a Comment