GB/T2439-2001硫化橡膠或熱塑性橡膠導電性能和耗散性能電阻率測定儀

一、符合標準及適用范圍：

    *符合國家標準GB1410－2006固體電工絕緣材料絕緣電阻、體積電阻系數(shù)和表面電阻試驗方法，ASTM D257 絕緣材料的直流電阻或電導試驗方法 等標準要求。本儀器配不同的測量電極（夾具）可以測量不同材料（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定。本儀器除能測電阻外，還能直接測量微弱電流。

二、技術指標

三、工作原理

    根據(jù)歐姆定律，被測電阻Rx等于施加電壓V除以通過的電流I。傳統(tǒng)的高阻計的工作原理是測量電壓V固定，通過測量流過取樣電阻的電流I來得到電阻值。從歐姆定律可以看出，由于電流I是與電阻成反比，而不是成正比，所以電阻的顯示值是非線性的，即電阻無窮大時，電流為零，即表頭的零位處是∞，其附近的刻度非常密，分辨率很低。整個刻度是非線性的。又由于測量不同的電阻時，其電壓V也會有些變化，所以普通的高阻計是精度差、分辨率低。
    本臺電阻率測試儀是同時測出電阻兩端的電壓V和流過電阻的電流I，通過內(nèi)部的大規(guī)模集成電路完成電壓除以電流的計算，然后把所得到的結(jié)果經(jīng)過A/D轉(zhuǎn)換后以數(shù)字顯示出電阻值，即便是電阻兩端的電壓V和流過電阻的電流I是同時變化，其顯示的電阻值不象普通高阻計那樣因被測電壓V的變化或電流Ｉ的變化而變，所以，即使測量電壓、被測量電阻、電源電壓等發(fā)生變化對其結(jié)果影響不大，其測量精度很高()，從理論上講其誤差可以做到零，而實際誤差可以做到千分之幾或萬分之幾。

四、典型應用

1、測量絕緣材料電阻(率)
2、測量防靜電材料的電阻及電阻率
3、測量計算機房用活動地板的系統(tǒng)電阻值
4、測量防靜電鞋、導電鞋的電阻值
5、光電二極管暗電流測量
6、物理,光學和材料研究

五、標準配置：

使用注意事項     

★高阻測量一定要嚴格按使用方法步聚進行，否則有可能造成儀器*損壞或電人。 
7.1 應在“Rx"兩端開路時調(diào)零（主機開機）
如接在電阻箱或被測量物體上時調(diào)零后測量會產(chǎn)生很大的誤差。一般一次調(diào)零后在測試過程中不需再調(diào)零，但改變測量電壓后可能要重新調(diào)零。 
7.2 禁止將“Rx"兩端短路，以免微電流放大器受大電流沖擊
7.3 在測試過程中不要隨意改動測量電壓， 
★隨意改動測量電壓可能因電壓的過高或電流過大損壞被測試器件或測試儀器，而且有的材料是非線性的，即電壓與電流是不符合歐姆定律，有改變電壓時由于電流不是線性變化，所以測量的電阻也會變化。 
7.4 測量時從低次檔逐漸拔往高次檔 
★每撥一次稍停留1～2秒以便觀察顯示數(shù)字，當有顯示值時應停下，記錄當前的數(shù)字即是被測電阻值。若顯示“1"時，表示欠量程應往高次檔拔。直到有顯示數(shù)字時為止。當有顯示數(shù)字時不能再往高次檔撥，否則有可能損壞儀器(機內(nèi)有過電流保護電路)。除104 Ω檔之外，當顯示低于1.99，表示過量程應換低檔! 
7.5 大部分絕緣材料，特別是防靜電材料的電阻值在加電壓后會有一定變化而引起數(shù)字變化 
★由于本儀器的分辯率很高，因而會引起顯示值的末尾幾位數(shù)也變化，這不是儀器本身的問題，而是被測量對象的導電機理復雜而使得阻值有些變化。在這種情況下往往取2位有效數(shù)就夠了。 
7.6 接通電源后，手指不能觸及高壓線的金屬部分 
★本儀表有二連根線:高壓線(紅)和微電流測試線。在使用時要注意高壓線，開機后人不能觸及高壓線，。 
7.7 測試過程中不能觸摸微電流測試端 
★微電流測試端zui怕受到大電流或人體感應電壓及靜電的沖擊。所以在開機后和測試過程中不能與微電流測試端接觸，以免損壞儀表。 
7.8 在測量高阻時，應采用屏蔽盒將被測物體屏蔽. 
★在測量大于1010 Ω以上時，為防止外界干擾面而引起讀數(shù)不穩(wěn)。 
7.9 每次測量完時應將量程開關撥回“104 "檔再進行下次測試
在測量時應逐漸將量程開關撥到高阻檔，測量完時應將電流電阻量程、電壓量程開關撥回低檔。以 確保下次開機時量程開關處在低阻量程檔

GB/T2439-2001硫化橡膠或熱塑性橡膠導電性能和耗散性能電阻率測定儀

In full compliance with national standards GB14102006 solid electrical insulationinsulation resistance, volume resistivity and surface resistance test method of material,ASTM D257, DC resistance or conductance of insulating materials test methodstandards. The apparatus with different measuring electrode (fixture) can measure different materials (solid, powder or liquid) of the volume resistivity and surfaceresistivity or conductivity. Various applicable to rubber, plastic, film, powder, liquid, and solid and pasty insulating material shape determination of volume and surfaceresistance value. In addition to the instruments can measure resistance, but also the direct measurement of weak current.

Serial number

Project

Parameters

1

Resistance measurement range

1 * 104 ~ 1 * 1018 Omega Omega

2

Current measuring range

2 * 10-4A to 1 * 10-16A

3

Display mode

Digital LCD display

4

The built-in test voltage

10V, 50V, 100V, 250V, 500V, 1000V

5

Basic accuracy

1%

6

The use of the environment

Temperature: 0 to 40 DEG C, relative humidity <80%

7

Power supply

AC 220V, 50HZ, power consumption is about 5W

8

Instrument size

285mm * 245mm * 120 mm

9

Quality

About 5KG

10

Small volume, light weight, high accuracy

Resistance, current double display, performance good stability, convenient reading

11

Ultra high resistance as measured with a multimeter common resistance like simplemeasurements enable

From multiplied by the coefficient etc. use inconvenience trouble to the old high resistance meter in different test voltage or different range

According to Ohm's law, the resistance being measured Rx is equal to the applied voltage divided by current V by I. The working principle of the high resistance meter is the traditional measuring voltage V fixed, by measuring the current flowing through the sampling resistor I to obtain the resistance value. From Ohm's law can be seen,because the current I is inversely proportional to the resistance, but not proportional, sois nonlinear resistive display value, i.e., infinite resistance, current is zero, i.e. zero at the header is infinite, scale near the very dense, with a low resolution. The scale is nonlinear. Because the resistance measurement of different voltage, the V will also besome changes, so the high resistance of ordinary gauge is poor accuracy, low resolution.

The station is the current resistivity tester voltage V and flow resistance measured at the same time across the resistor I, the large scale integrated circuit internal to complete the calculation of voltage divided by current, then put the results obtained after A/D conversion to digital display value of resistance, even the current voltage V and the flowresistance of the two end of the resistor I is the change at the same time, it shows the value of resistance is not like ordinary high resistance meter that due to changes in the voltage to be measured changes in V or I current and change, so, even if themeasurement of voltage, resistance, power supply voltage is measured changes to its result affects big, its measurement precision is very high (patent), from the theoryspeaking of its error can do zero, while the actual error can do a few thousandths orvery few.

Insulation resistance measurement (rate), 1

2, measurement of anti electrostatic material resistance and resistivity

3, measurement of computer room with movable floor system resistance value

Resistance of 4, measurement of anti-static shoes, conductive shoes value

5, photoelectric diode dark current measurement

6, physical, optical and material research

Five, the standard configuration:

Serial number

To configure

Company

Number

1

The test instrument

Table

1

2

The electrode box

Table

1

3

Power cord

Strip

1

4

Measuring line

Strip

3

5

An instruction manual

Copy

1

The use of attention to matters

* high resistance measurement must be in strict accordance with the method of usingsteps, otherwise it may cause permanent damage or power apparatus.

7.1 should be in the "Rx" at the open end of zero (host computer)

If connected to the resistance box or an object to be measured on the tunemeasurement of zero after the great error will occur. A general tone in the testing process zero does not need to zero, but change the measurement voltage may have tore zero.

7.2 prohibit "Rx" ends in order to avoid short circuit, a micro current amplifier by the large current impact

7.3 in the test process, do not arbitrarily change the voltage measurement,

By randomly changing the measuring voltage may be due to the voltage is too high ortoo large current device is damaged or testing instrument was tested, and somematerial is nonlinear, i.e., voltage and current is not accorded with Ohm's law, there ischange the voltage because the current is not linear change, so the electricalresistance measurement will change.

7.4 measurements from low to higher gear gear gradually pull

* every dial again slightly stay 1 to 2 seconds in order to observe the digital display,when the display value should be stopped, records of current digital is the measured resistance value. If the display is "1", said to owe range should be higher profiledrawing. Until the display digital time. When the display numbers cannot go higher gear shifting, or they may damage the instrument (the machine of an overcurrent protection circuit). In addition to 104 ohm, when the display is less than 1.99, showing excessprocess should downshift!

7.5 parts of insulating material, especially the resistance of antistatic material value involtage after a certain change caused by digital change

* because the instrument resolution is very high, which will cause the display value of the end digits of changes, this is not the instrument itself, the conductive mechanism butthe measured object is complex and make some change in resistance. In this case oftentake 2 effective number is enough.

7.6 after the power is switched on, the metal part of the finger can not touch the high-voltage wire

* this instrument has two lines: Roots high-voltage wire (red) and micro current test line.When in use, attention should be paid to the high-voltage lines, starting later generations can't touch the high-voltage wire,.

Can not touch the micro current test terminal 7.7 testing process

* micro current measurement end fear by the current or the human body inductionvoltage and static shock. The