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Commonly used potentiometer unique feature
Time:2007-4-26 13:47:22  Visits:5436

Commonly used potentiometer unique feature

(1) synthesis carbon membrane potential: Is at present uses most one kind of potentiometers.Its resistance element is with configuration and so on carbon black, graphite, quartz powder, organic bond mixtures, spreads makes on the rubber plank or the glass fiberboard.

Merit: The resolution high, the resistance number scope is wide;

Shortcoming: The glide noise big, the heat-resisting moisture-proof is not good.

Variety: Has the ordinary synthesis carbon membrane potential, the belt switch small synthesis carbon membrane potential, Shan Liandai the switch (does not have switch) twin the potentiometer, coaxial does not have the switch (belt switch) the potentiometer, the twin different axis does not have the switch (belt switch) the potentiometer, the small precise synthesis carbon membrane potential, the push and pull switch synthesis carbon membrane potential, the straight skid type synthesis carbon membrane potential, the precise multi-circle synthesis carbon membrane potential and so on.

(2) metallic membrane potentiometer: Its resistance element is with the metal alloy membrane, the metal oxide film, the metal compound membrane, the tantalum oxide membrane material makes through the vacuum technique deposition in the ceramic substrate.

Merit: The resolution high, the glide noise synthesizes the carbon membrane potential to be small;

Shortcoming: The resistance number scope small, the resistance to wear is not good.

(3) wire potentiometer: Its resistance element is spreading by the resistance silk cord has the insulation material metal or nonmetallic panel is made.

Merit: The power big, the noise low, the precision high, the stability is good;

Shortcoming: The high-frequency response is bad.

Variety: Has the ordinary wire potentiometer, the ordinary multi-circle wire potentiometer, the precise multi-circle wire potentiometer, the straight skid type precise multi-circle wire potentiometer, the function type precise multi-circle wire potentiometer and so on.

(4) solid potentiometer: Is after configuration and so on carbon black, graphite, quartz powder, organic bond material dual firings, presses in the plastic substrate, again passes through the heating polymerization to become.

Merit: The resolution high, the resistance to wear good, the resistance number scope width, the reliability high, the volume is small;

Shortcoming: Noise big, thermostable difference.

Variety: May divide into the small solid potentiometer, the straight line type solid potentiometer, to the numerical expression solid potentiometer.

(5) single circle potentiometer and multi-circle potentiometer:

Single circle potentiometer: Its arm only can in 3600 scope internal rotations, use in the volume control generally;
Multi-circle potentiometer: Its revolution axis transfers every time, the arm electronic contact only changes the very small section of distances in the resistance element, when its arm from an extreme position to another extreme position, the revolution axis needs to rotate the multi-circles.Uses in generally the fine adjustment electric circuit.

(6) only unites the potentiometer and the twin potentiometer:

Only joint potentiometer: Controls group of potentiometers by an independent revolution axis;
Twin potentiometer: Usually is installs two specification same potentiometers on the identical revolution axis, when adjusts the revolution axis, two potentiometer sliding contact synchros.Also has a part of twin potentiometer for the asynchronous different axis.

(7) belt switch potentiometer: The attachment has the switching arrangement on the potentiometer.Switch and potentiometer coaxial, the switch movement and the control mode divide into the rotary system and push two kinds.

Use: Uses in the monochrome set making the volume control concurrently power switch.The small rotary system belt switch potentiometer mainly uses in the transistor radio either other small electronic products makes the volume control (or electric current, voltage regulation) the concurrently power switch.
Type: The switch figure has the single-pole single-throw, the single tool double throw and the double knife single-throw.

(8) straight skid type potentiometer: Its resistance element is the rectangle linearity, it is through makes the translation with the slide rails connected slippery handle to change the resistance value.
Use: Uses in generally the television, the sound makes the volume control or the balanced control.

(9) pastes the piece type potentiometer: Also called the laminated potentiometer, is one kind of not manual rotation axis subminiature straight line type potentiometer, when the adjustment must use the bolt to turn on lathe has and so on the tools.

Type: Divides into 1. Single circle potentiometer;
2. The multi-circle potentiometer - is the precision resistor, has vertical and the horizontal-type two kind of structures.

(10) step-by-steps the potentiometer: By step-by-steps the electric motor, the revolution axis resistance element, the moving contact and so on is composed.The moving contact may through the revolution axis manual regulation, also may by step-by-step the direct motor drive.

Use: Uses in the audio power amplifier making the volume control.

Commonly used potentiometer unique feature two

Potentiometer

The potentiometer is one adjustable resistance, also is in the electronic circuit one of use most widespread primary devices.It foreign has three leading-out terminals, two are the fixed ends, another is the center tap.The rotation or the adjustment potentiometer rotating axis, between its center tap and the fixed end resistance will change.2.2.1 potentiometer performance indices

The potentiometer and the resistor performance index meaning in aspects and so on nominal resistance number, allowable deviation, rated power is consistent, in addition also has the following target.

1. Resistance number change rule

The resistance number change rule is refers to the potentiometer degrees rotation (or traveling schedule) with uses as the voltage divider when the output voltage relations.Common potentiometer resistance number change rule wired change in sexuality moulding, index change, logarithm change.

2. glide noises

When the electronics brush skids when the resistance element, between the potentiometer center end and the fixed end voltage appears the non-rule the fluctuation, this kind of phenomenon is called the potentiometer the glide noise.It is non-uniform as well as the electronics brush skids by the material resistivity distribution when the contact resistance disorder change causes.

3. resolving powers

Finest adjustment ability may realize which to the output.The wire potentiometer resolving power is bad.

4. limiting voltages

Potentiometer in short time internal energy withstanding highest voltage.

5. mechanical durabilities

Usually take revolves (or glide) how many times as the symbol, expresses the potentiometer service life target.

2.2.2 several kind of commonly used potentiometer models and specification

1. organic solid core potentiometers

By the conducting material and the organic padding, the thermosetting resin compound the resistance powder, the process thermo-compression, on base shape mature core resistance element.This potentiometer characteristic is the structure simple, thermostable, the volume small, the life long, the reliability is high, widely uses in welding panel makes the trimming use in the electric circuit; The shortcoming is the pressure resistance low, the noise is big.Several kind of commonly used organic solid core potentiometer performance index sees Table 2-6 to show.

Table 2-6 commonly used organic solid core potentiometer performance index

Model

Characteristic

Main size

Installs the form

Resistance number characteristic

Rated power

Resistance number scope

WS-1

Ordinary Shan Quan

φ12.7mm

Single-hole axle sleeve

X

D, Z

0.5W

0.25W

100 ~4.7M

1k ~1M

WS-2

WS16-4

Ordinary Shan Quan

φ17mm

Support horizontal type

X

D, Z

0.5W

0.25W

100 ~2.2M

1k ~1M

WS19-3

Coaxial double bond

φ18mm

Guards against transfers the axle sleeve

X

D, Z

1W

0.5W

100 ~4.7M

1k ~470k

WS19-4

WSW3-3

Single circle trimming

φ7.5mm

Lead wire vertical

0.25W

100 ~1K

WS23

Single circle trimming

φ12.7mm

Lead wire vertical

0.5W

100 ~1K

WS24

Single circle trimming

φ12.7mm

Lead wire horizontal type

0.25W

100 ~1K

2. wire potentiometers

Circles with the alloy resistance wire on the insulation skeleton makes the resistance element, the center tap reed skids on the resistance wire.The wire potentiometer versatility, may make the popular type, precise and the trimming potentiometer, also the rated power quite in a big way makes, the resistance temperature coefficient small, the noise low, the pressure resistance is high.The commonly used wire potentiometer performance index sees Table 2-7.

Table 2-7 commonly used wire potentiometer performance index

Model

Characteristic

Main size

Installs the form

Rated power

Resistance number scope

WX2

Ordinary Shan Quan

φ18mm

Guards against transfers the axle sleeve

1W

27 ~15k

WX3

Ordinary Shan Quan

φ23mm

Guards against transfers the axle sleeve

3W

27 ~15k

WXX0.25-1

Single circle trimming

φ9mm

Vertical

0.25W

47 ~4.7k

WXX0.25-2

Single circle trimming

φ9mm

Axle sleeve

0.25W

47 ~4.7k

WXX0.25-3

Single circle trimming

φ9mm

Lead wire horizontal type

0.25W

47 ~4.7k

WXD9

10 Shan Lian

φ12mm

Axle sleeve clamp

0.5W

22 ~27k

3. synthesis membrane potentials

Paints lamination Cheng Tanmo in the insulation substrate, forms the carbon diaphragm after the warming polymerization, again becomes with other components combination.This kind of potentiometer resistance number change, the resolution high, the resistance number scope width, the cost are continuously low.But is bad to the temperature and the humidity compatibility, the service life is short.The commonly used synthesis membrane potential performance index sees Table 2-8.

Table 2-8 commonly used synthesis membrane potential performance index

Model

Rated power (W)

Resistance number characteristic

Resistance number scope (OMEGA)

Precision

Maximum working voltage (V)

WH118

2

X

470Ω~4.7MΩ

±20%

500

1

D, Z

4.7kΩ~2.2MΩ

400

WH5

0.5

X

470Ω~4.7MΩ

±20%

200

0.25

D, Z

4.7kΩ~2.2 MΩ

150

WH19

0.25

X

1kΩ~2.2 MΩ

±20%

200

0.1

D, Z

4.7kΩ~470kΩ

160

WH23

0.5

X

1kΩ~1 MΩ

±20%

150

0.25

D, Z

4.7kΩ~100k OMEGA

100

WH144

0.25

X

220Ω~2.2 MΩ

±20%

350

WH167

0.1

X

470Ω~4.7 MΩ

±20%

100

More than 4. potentiometer

The multi-circle potentiometer belongs to the precision resistor.It divides indicator forms and so on has the belt indicator, does not bring, the adjustment turn to have 5, 10 and so on several kinds.This potentiometer besides has the wire potentiometer same characteristic, but also has the linearity to be fine, can carry on merits and so on fine control, but widely applies in implements the accurate adjustment to the resistance the situation.

 

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