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體積表面電阻率測試儀（BEST-121）

（固體絕緣材料體積電阻率和表面電阻率試驗方法）

操作方式：

1、電流先手動調零

2、調整測試電壓

3、旋轉電阻波蕩觀察數值

4、讀取電阻值

5、根據電阻值按以下公式求出

（1）體積電阻率

式中：P_V——體積電阻率，單位為歐姆厘米（Ω.cm）；

R_X——按測得的體積電阻，單位為歐姆（Ω）；

A——是被保護電極的有效面積，單位為平方米（m²）或（平方厘米（cm²））

h——試樣的平均厚度，單位為米(m)或厘米（cm）

（2）表面電阻率計算：

表面電阻率計算公式如下：

式中：P_s——體積電阻率，單位為歐姆米（Ω.cm）；

R_X——按測得的表電阻，單位為歐姆（Ω）；

P——是被保護電極的有效周長，單位為米（m）或（厘米（cm））

g——兩電極之間的距離，單位為米(m)或厘米（cm）

概述：

    體積表面電阻率測試儀既可測量高電阻，又可測微電流。采用了美國In公司的大規模集成電路,使儀器體積小、重量輕、準確度高。數字液晶直接顯示電阻值和電流。電阻量限從1×10⁴Ω ～1×10¹⁸ Ω，是目前國內測量范圍zui寬，準確度zui高的數字超高阻測量儀。電流測量范圍為2×10^-4 ～1×10^-16Ａ。機內測試電壓為10V/50V/100V/250V/500V/1000V任意可調。本儀器具有精度高、顯示迅速、性好穩定、讀數方便， 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。

技術指標：  

1、電阻測量范圍：1 ×10⁴Ω ～1×10¹⁸Ω。

2、電流測量范圍：2×10^-4A～1×10^-16A

3、顯 示 方 式： 32位LED液晶屏顯示

4、內置測試電壓： 10V 、50V、100V、250、500、1000V

5、基本準確度：1%

6、使用環境： 溫度：0℃～40℃，相對濕度<80%

7、機內測試電壓： 10V/50V/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、質量： 約2.5KG

工作原理：

   根據歐姆定律，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。

本儀器是同時測出電阻兩端的電壓V和流過電阻的電流I，通過內部的大規模集成電路完成電壓除以電流的計算，然后把所得到的結果經過A/D轉換后以數字顯示出電阻值，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、電源電壓等發生變化對其結果影響不大，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。

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

標準配置：   

1、測試儀器：1臺

2、.電源線：1條

3、測量線：3根（屏蔽線、測試接線、接地線）

4、使用說明書：1份

備注：

體積表面電阻率測試儀配不同的測量電極（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，*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。

英文翻譯：

Meet the standards:
Test method for volume resistivity and surface resistivity of solid insulating materials by 1410-2006 GB/T
Test method for DC resistance or conductance of insulating materials by D257-99 ASTM
Test method for resistance and resistivity of insulating materials at high temperature by 10581-2006 GB/T
1692-2008 GB/T "determination of electrical resistivity of vulcanized rubber"
2439-2001 GB/T - Determination of electrical conductivity and dissipative properties of vulcanized rubber or thermoplastic rubber
12703.4-2010 GB/T "the fourth part of the evaluation of the electrostatic properties of textiles: electrical resistivity"
10064-2006_ GB/T "test method for the determination of the insulation resistance of solid insulating materials"
First, an overview:
The instrument can measure high resistance, and measuring current. Large scale integrated circuit of In company is adopted, which makes the instrument small size, light weight and high accuracy. Digital liquid crystal display direct current resistance and current. Resistance limit from 1 * 104 to 1 * 1018, is currently the most wide measurement range, the highest accuracy of digital ultra high resistance measuring instrument. The current measurement range is 2 * 10-4 ~ 1 * 10-16A. The test voltage of the machine is adjustable for 10V/50V/100V/250V/500V/1000V. The instrument has the advantages of high precision, display quickly, good stability, easy reading, applicable to rubber, plastics, film, powder, liquid, and solid and cream body shape of various insulating materials volume and surface resistivity value determination.
Three, technical indicators
1, resistance measurement range: 1 * 104 ~ 1 * 1018.
2, current measurement range: 2 x 10-4A ~ 1 * 10-16A
3, display mode: 32 LED LCD screen display
4, built-in test voltage: 10V, 50V, 100V, 250, 500, 1000V
5, basic accuracy: 1%
6, the use of the environment: temperature: 0 degrees Celsius to 40 degrees Celsius, the relative humidity of <80%
7, the machine test voltage: 10V/50V/100/250/500/1000V arbitrary switching
8, power supply form: 220V AC, 50HZ, power consumption of about 5W
9, instrument size: 285mm * 245mm * 120 mm
10, quality: about 2.5KG
Four, working principle
According to Ohm's law, the measured resistance Rx is equal to the applied voltage V divided by the current I. The traditional high resistance meter works is the measurement of the voltage V fixed, by measuring the flow through the sampling resistance of the current I to get the resistance value. Can be seen from Ohm's law, due to the current I is inversely proportional to the resistance, and not directly proportional to, so the resistance to the display value is nonlinear, the resistance is infinite, the current is zero, namely header zero is infinity, near the scale is very close, the resolution is too low. The whole scale is nonlinear. And since the measurement of different resistance, the voltage V will be some changes, so the average high resistance meter is poor accuracy, low resolution.
This instrument is the current flowing through the resistor V and the voltage across the resistor I measured at the same time, the large scale integrated circuit to complete the calculation of the internal voltage divided by the current, and then the results obtained after A/D conversion by the digital display of the resistance value, even if the current voltage V and the flow resistance of the two ends of the I is changed at the same time, the resistance value is not displayed as ordinary high resistance meter as a result of changes in the measured voltage or current change of V and I, so even if the measurement voltage, the measured resistance and power voltage change has little influence on the results, the measuring accuracy is very high (patent), according to the theory of the error can do zero, while the actual error can be done a few thousandths or very few.
Five, typical applications
1, measuring the resistance of insulating materials (rate)
2. Measure the resistance and resistivity of the antistatic material.
3. Measure the system resistance value of the computer room floor.
4, measuring the resistance value of anti-static shoes, conductive shoes
5, photoelectric diode dark current measurement
6, physics, optics and materials research
Six, standard configuration:
1, test equipment: 1 sets
2, power line: 1
3, measuring line: 3 (shielding wire, test wiring, grounding wire)
4, the instruction manual: 1 copies
Seven, remarks:
The apparatus with different measuring electrode (fixture) can measurement of different materials (solid, powder or liquid) volume resistivity and surface resistivity or conductivity, in full compliance with national standards GB1410 - 2006 solid electrical insulation materials insulation resistance, volume resistivity and surface resistivity test method, ASTM D257 insulation material of DC resistance or conductance of test method standards requirements.
Operation mode:
1, the current first manual adjustment
2, adjust the test voltage
3, the rotating resistance undulator numerical observation
4, read resistance value
5, according to the resistance value according to the following formula
(1) volume resistivity
Formula: PV - volume resistivity, the unit is ohm cm (.Cm);
RX - according to the measured volume of resistance, the unit is Ohm (ohm);
A - is the effective area of the protective electrode, the unit is square meter (M2) or (square centimeter (cm2))
H - the average thickness of the sample, the unit is m (m) or cm (CM)
(2) surface resistivity calculation:
The formula for calculating the surface resistivity is as follows:
Formula: Ps - volume resistivity, the unit is Ohm meter (.Cm);
RX - according to the measured resistance, the unit is Ohm (ohm);
P - is the effective perimeter of the protected electrode, the unit is meter (m) or (cm (CM))
G - the distance between the two electrodes, the unit is m (m) or cm (CM)