体积表面电阻率测试仪（BEST-121）

（固体绝缘材料体积电阻率和表面电阻率试验方法）

操作方式：

1、电流先手动调零

2、调整测试电压

3、旋转电阻波荡观察数值

4、读取电阻值

5、根据电阻值按以下公式求出

（1）体积电阻率

式中：P_V——体积电阻率，单位为欧姆厘米（Ω.cm）；

R_X——按测得的体积电阻，单位为欧姆（Ω）；

A——是被保护电极的有效面积，单位为平方米（m²）或（平方厘米（cm²））

h——试样的平均厚度，单位为米(m)或厘米（cm）

（2）表面电阻率计算：

表面电阻率计算公式如下：

式中：P_s——体积电阻率，单位为欧姆米（Ω.cm）；

R_X——按测得的表电阻，单位为欧姆（Ω）；

P——是被保护电极的有效周长，单位为米（m）或（厘米（cm））

g——两电极之间的距离，单位为米(m)或厘米（cm）

概述：

    体积表面电阻率测试仪既可测量高电阻，又可测微电流。采用了美国In公司的大规模集成电路,使仪器体积小、重量轻、准确度高。数字液晶直接显示电阻值和电流。电阻量限从1×10⁴Ω ～1×10¹⁸ Ω，是目前国内测量范围zui宽，准确度zui高的数字超高阻测量仪。电流测量范围为2×10^-4 ～1×10^-16Ａ。机内测试电压为10V/50V/100V/250V/500V/1000V任意可调。本仪器具有精度高、显示迅速、性好稳定、读数方便， 适用于橡胶、塑料、薄膜、及粉体、液体、及固体和膏体形状的各种绝缘材料体积和表面电阻值的测定。

技术指标：  

1、电阻测量范围：1 ×10⁴Ω ～1×10¹⁸Ω。

2、电流测量范围：2×10^-4A～1×10^-16A

3、显 示 方 式： 32位LED液晶屏显示

4、内置测试电压： 10V 、50V、100V、250、500、1000V

5、基本准确度：1%

6、使用环境： 温度：0℃～40℃，相对湿度<80%

7、机内测试电压： 10V/50V/100/250/500/1000V 任意切换

8、供电形式： AC 220V，50HZ，功耗约5W

9、仪器尺寸： 285ｍｍ× 245ｍｍ× 120 mm

10、质量： 约2.5KG

工作原理：

   根据欧姆定律，被测电阻Rx等于施加电压V除以通过的电流I。传统的高阻计的工作原理是测量电压V固定，通过测量流过取样电阻的电流I来得到电阻值。从欧姆定律可以看出，由于电流I是与电阻成反比，而不是成正比，所以电阻的显示值是非线性的，即电阻无穷大时，电流为零，即表头的零位处是∞，其附近的刻度非常密，分辨率很低。整个刻度是非线性的。又由于测量不同的电阻时，其电压V也会有些变化，所以普通的高阻计是精度差、分辨率低。

本仪器是同时测出电阻两端的电压V和流过电阻的电流I，通过内部的大规模集成电路完成电压除以电流的计算，然后把所得到的结果经过A/D转换后以数字显示出电阻值，即便是电阻两端的电压V和流过电阻的电流I是同时变化，其显示的电阻值不象普通高阻计那样因被测电压V的变化或电流Ｉ的变化而变，所以，即使测量电压、被测量电阻、电源电压等发生变化对其结果影响不大，其测量精度很高()，从理论上讲其误差可以做到零，而实际误差可以做到千分之几或万分之几。

典型应用：

1、测量绝缘材料电阻(率)

2、测量防静电材料的电阻及电阻率

3、测量计算机房用活动地板的系统电阻值

4、测量防静电鞋、导电鞋的电阻值

5、光电二极管暗电流测量

6、物理,光学和材料研究

标准配置：   

1、测试仪器：1台

2、.电源线：1条

3、测量线：3根（屏蔽线、测试接线、接地线）

4、使用说明书：1份

备注：

体积表面电阻率测试仪配不同的测量电极（夹具）可以测量不同材料（固体、粉体或液体）的体积电阻率和表面电阻率或电导率，*符合国家标准GB1410－2006固体电工绝缘材料绝缘电阻、体积电阻系数和表面电阻试验方法，ASTM D257 绝缘材料的直流电阻或电导试验方法　等标准要求。

英文翻译：

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)