塑料體積電阻率測(cè)試儀  什么是體積電阻率？

　　體積電阻率，是材料每單位體積對(duì)電流的阻抗，用來(lái)表征材料的電性質(zhì)。通常體積電阻率越高，材料用做電絕緣部件的效能就越高。通常所說(shuō)的電阻率即為體積電阻率。

　　，式中，h是試樣的厚度（即兩極之間的距離）；S是電極的面積，ρv的單位是Ω?m（歐姆?米）。

　　材料的導(dǎo)電性是由于物質(zhì)內(nèi)部存在傳遞電流的自由電荷，這些自由電荷通常稱為載流子，他們可以是電子、空穴、也可以是正負(fù)離子。在弱電場(chǎng)作用下，材料的載流子發(fā)生遷移引起導(dǎo)電。材料的導(dǎo)電性能通常用與尺寸無(wú)關(guān)的電阻率或電導(dǎo)率表示，體積電阻率是材料導(dǎo)電性的一種表示方式。

簡(jiǎn)言之，在絕緣材料里面的直流電場(chǎng)強(qiáng)度與穩(wěn)態(tài)電流密度之商,即單位體積內(nèi)的體積電阻.

塑料體積電阻率測(cè)試儀  主要標(biāo)準(zhǔn)：

GB/T 1410-2006《 固體絕緣材料體積電阻率和表面電阻率試驗(yàn)方法》

ASTM D257-99  《絕緣材料的直流電阻或電導(dǎo)試驗(yàn)方法》

GB/T 2439-2001《硫化橡膠或熱塑性橡膠 導(dǎo)電性能和耗散性能電阻率的測(cè)定》

GB/T 10581-2006《絕緣材料在高溫下電阻和電阻率的試驗(yàn)方法》

GB/T 1692-2008《硫化橡膠絕緣電阻率的測(cè)定》

GB/T 12703.4-2010《紡織品 靜電性能的評(píng)定 第４部分：電阻率》

GB/T 10064-2006《測(cè)定固體絕緣材料絕緣電阻的試驗(yàn)方法》

材料說(shuō)明

　　A、通常,絕緣材料用于電氣系統(tǒng)的各部件相互絕緣和對(duì)地絕緣,固體絕緣材料還起機(jī)械支撐作用.一般希望材料有盡可能高的絕緣電阻,并具有合適的機(jī)械、化學(xué)和耐熱性能.

　　B、體積電阻班組可作為選擇絕緣材料的一個(gè)參數(shù),電阻率隨溫度和濕度的京戲化而顯著變化.體積電阻率的測(cè)量常常用來(lái)檢查絕緣材料是否均勻,或都用來(lái)檢測(cè)那些能影響材料質(zhì)量而又不能作其他方法檢測(cè)到的導(dǎo)電雜質(zhì).

　　C、當(dāng)直流電壓加到與試樣接觸的兩電極間時(shí),通過(guò)試樣的電流會(huì)指數(shù)式地衰減到一個(gè)穩(wěn)定值.電流隨時(shí)間的減小可能是由于電介質(zhì)極化和可動(dòng)離子位移到電極所致.對(duì)于體積電阻小于10的10Ω.m

　　的材料,其穩(wěn)定狀態(tài)通常在1min內(nèi)達(dá)到.因此,要經(jīng)過(guò)這個(gè)電化時(shí)間后測(cè)定電阻.對(duì)于電阻率較高的材料,電流減小的過(guò)程可能會(huì)持續(xù)幾分鐘、幾小時(shí)、幾天,因此需要用較長(zhǎng)的電化時(shí)間.如果需要的話,可用體積電阻率與關(guān)系來(lái)描述材料的特性.

　　D、由于體積電阻總是要被或多或少地包括到表面電阻的測(cè)試中去,因些近似地測(cè)量表面電阻,測(cè)得的表面電阻值主要反映被測(cè)試樣表面污染的程度.所以,表面電阻率不是表面材料本身特性的參數(shù),而是一個(gè)有關(guān)材料表面污染特性的參數(shù).

　　當(dāng)表面電阻較高時(shí),它常隨時(shí)間以不規(guī)則的方式變化.測(cè)量表面電阻通常都規(guī)定11min的電化時(shí)間.

符合標(biāo)準(zhǔn)及適用范圍：

    完全符合國(guó)家標(biāo)準(zhǔn)GB1410－2006固體電工絕緣材料絕緣電阻、體積電阻系數(shù)和表面電阻試驗(yàn)方法，ASTM D257絕緣材料的直流電阻或電導(dǎo)試驗(yàn)方法　等標(biāo)準(zhǔn)要求。

    本儀器配不同的測(cè)量電極（夾具）可以測(cè)量不同材料（固體、粉體或液體）的體積電阻率和表面電阻率或電導(dǎo)率。適用于橡膠、塑料、薄膜、及粉體、液體、及固體和膏體形狀的各種絕緣材料體積和表面電阻值的測(cè)定。本儀器除能測(cè)電阻外，還能直接測(cè)量微弱電流。

技術(shù)指標(biāo)

1.電阻測(cè)量范圍：0.01?10 4Ω ～1?10 18Ω。

2.電流測(cè)量范圍為: 2?10-4A～1?10-16A

3.雙表頭顯示: 3.1/2位LED顯示

4.內(nèi)置測(cè)試電壓：10V、50V、100V、250、500、1000V

5.準(zhǔn)確度:準(zhǔn)確度優(yōu)于下表

量程有效顯示范圍20～30℃RH<80%

104 0.01~19.99 5%

105 0.01～19.99 5%

106 0.01～19.99 5%

107 0.01～19.99 5%

108 0.01～19.99 5%

109 0.01～19.99 5%

1010    0.01～19.99 5% 2字

1011     0.01～19.99 5% 2字

1012 0.01～19.99 5% 5字

1013 0.01～19.99 10% 5字

1014 0.01～19.99 10% 5字

1014以上0.01～19.99 10-15% 5字

超出有效顯示范圍時(shí)誤差有可能增加，測(cè)試電流準(zhǔn)確度與電阻相同，測(cè)試電壓準(zhǔn)確度為10%

6使用環(huán)境:溫度：0℃～40℃，相對(duì)濕度<80%

7機(jī)內(nèi)測(cè)試電壓: 10/50/100/250/500/1000V任意切換

8.供電形式: AC 220V，50HZ，功耗約5W

9.儀器尺寸: 285ｍｍ?245ｍｍ?120 mm

10.質(zhì)量:約2.5KG

11  測(cè)試電壓有六種選擇之多DC10V、50V、100V、250V、500V、1000V；

12  使用操作簡(jiǎn)便，在任何電阻量程和測(cè)試電壓下均直接讀顯示數(shù)字結(jié)果，

免去要乘以一個(gè)系數(shù)的麻煩，使測(cè)量超高電阻就如用萬(wàn)用表測(cè)量普通電阻樣簡(jiǎn)便。

What is volume resistivity?

Volume resistivity is the impedance of a material to current per unit volume, used to characterize the electrical properties of the material. The higher the volume resistivity, the more effective the material is as an electrical insulation component. The resistivity commonly referred to is the volume resistivity.

In the formula, h is the thickness of the sample (i.e. the distance between the two poles); S is the area of the electrode, and the unit ofρv isΩ?m (ohm meters).

The conductivity of materials is due to the presence of free charges inside the material that transfer current, which are commonly referred to as charge carriers. They can be electrons, holes, or positive and negative ions. Under the action of a weak electric field, the migration of charge carriers in the material causes conductivity. The conductivity of materials is usually represented by resistivity or conductivity that is independent of size, and volume resistivity is a way of expressing the conductivity of materials.

In short, the quotient of the DC electric field strength and steady-state current density in insulating materials is the volume resistance per unit volume

Main standards:

GB/T 1410-2006 "Test Method for Volume and Surface resistivity of Solid Insulation Materials"

ASTM D257-99 "Test Method for DC Resistance or Conductivity of Insulation Materials"

GB/T 2439-2001 "Determination of Electrical Conductivity and Dissipation Properties of Vulcanized Rubber or Thermoplastic Rubber"

GB/T 10581-2006 "Test method for resistance and resistivity of insulating materials at high temperatures"

GB/T 1692-2008 "Determination of Insulation Resistance of Vulcanized Rubber"

GB/T 12703.4-2010 "Evaluation of electrostatic properties of textiles - Part 4: Electrical resistivity"

GB/T 10064-2006 "Test Method for Determining Insulation Resistance of Solid Insulation Materials"

Material Description

A. Usually, insulation materials are used for mutual insulation and ground insulation of various components in electrical systems, and solid insulation materials also serve as mechanical support Generally, it is desirable for materials to have the highest possible insulation resistance and appropriate mechanical, chemical, and heat resistance properties

B. The volume resistance group can be used as a parameter for selecting insulation materials, and the resistivity varies significantly with temperature and humidity The measurement of volume resistivity is often used to check whether the insulation material is uniform, or to detect conductive impurities that can affect material quality but cannot be detected by other methods

C. When a direct current voltage is applied between the two electrodes in contact with the sample, the current passing through the sample will exponentially decay to a stable value The decrease in current over time may be due to dielectric polarization and the displacement of movable ions to the electrode For 10Ω?m with a volume resistance less than 10

The material typically reaches a stable state within 1 minute Therefore, the resistance should be measured after this electrification time For materials with high resistivity, the process of current reduction may last for several minutes, hours, or days, thus requiring a longer electrochemical time If necessary, volume resistivity and its relationship can be used to describe the properties of materials

D. Due to the fact that volume resistance is always included to a greater or lesser extent in surface resistance testing, surface resistance is approximately measured, and the measured surface resistance value mainly reflects the degree of surface contamination of the tested sample So, surface resistivity is not a parameter of the surface material itself, but a parameter related to the surface pollution characteristics of the material

When the surface resistance is high, it often changes irregularly over time The measurement of surface resistance usually requires an electrochemical time of 11 minutes

Compliance with standards and scope of application:

Fully comply with the national standard GB1410-2006 Test Methods for Insulation Resistance, Volume Coefficient of Resistance, and Surface Resistance of Solid Electrical Insulation Materials, as well as ASTM D257 Test Methods for DC Resistance or Conductivity of Insulation Materials.

This instrument, equipped with different measuring electrodes (fixtures), can measure the volume resistivity, surface resistivity, or conductivity of different materials (solids, powders, or liquids). Suitable for measuring the volume and surface resistance values of various insulation materials in the shapes of rubber, plastic, film, powder, liquid, solid, and paste. This instrument can not only measure resistance, but also directly measure weak currents.

Technical indicators

1. Resistance measurement range: 0.01?10 4Ω~1?10 18Ω.

2. The range of current measurement is: 2?10-4A～1?10-16A

3. Dual header display: 3.1/2 LED display

4. Built in test voltage: 10V, 50V, 100V, 250, 500, 1000V

5. Accuracy: Accuracy is better than the following table

Effective display range of range: 20-30℃RH<80%

104 0.01~19.99 5%

105 0.01～19.99 5%

106 0.01～19.99 5%

107 0.01～19.99 5%

108 0.01～19.99 5%

109 0.01～19.99 5%

1010 0.01~19.99 5% 2 words

1011 0.01~19.99 5% 2 words

1012 0.01~19.99 5% 5 words

1013 0.01~19.99 10% 5 words

1014 0.01~19.99 10% 5 words

Above 1014, 0.01~19.99, 10-15% 5 words

When the effective display range is exceeded, the error may increase. The accuracy of the test current is the same as that of the resistance, and the accuracy of the test voltage is 10%

6. Operating environment: Temperature: 0℃~40℃, relative humidity<80%

7. Internal testing voltage: 10/50/100/250/500/1000V can be switched freely

8. Power supply form: AC 220V，50HZ，Power consumption is about 5W

9. Instrument size: 285mm?245mm?120mm

10. Quality: Approximately 2.5KG

There are six options for testing voltage: DC10V, 50V, 100V, 250V, 500V, and 1000V;

Easy to use and operate, it can directly read and display digital results at any resistance range and test voltage,

Eliminating the hassle of multiplying by a coefficient, making measuring ultra-high resistance as easy as measuring ordinary resistance with a multimeter.