橡胶塑料体积表面电阻率测定仪BEST-121

橡胶塑料体积表面电阻率测定仪符合标准及适用范围：

    *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。

    本仪器配不同的测量电极（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。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。本仪器除能测电阻外，还能直接测量微弱电流。

符合标准：
 
GB1410《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》 

概述 ：
    本仪器既可测量高电阻，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。以双3.1/2 位数字直接显示电阻的高阻计和电流。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10/50/100/250/500/1000V任意可调。本仪器具有精度高、显示迅速、性好稳定、读数方便， 适用于防静电产品如防静电鞋、防静电塑料橡胶制品、计算机房防静电活动地板等电阻值的检验以及绝缘材料和电子电器产品的绝缘电阻测量。本仪器除能测电阻外，还能直接测量微弱电流。

技术指标： 
1、电阻测量范围： 1×104Ω ～1×1018Ω。 
2、电流测量范围为： 2×10-4A～1×10-16A 
3、双表头显示： 3.1/2位LED显示 
4、内置测试电压：10V、50V、100V、250、500、1000V 
5、基本准确度：1% (*注) 
6、使用环境： 温度：0℃～40℃，相对湿度<80% 
7、机内测试电压： 10/50/100/250/500/1000V 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．测量防静电鞋、导电鞋的电阻值 
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、测量绝缘材料电阻(率) 
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

使用方法： 
6.1接好电源线 
确保电源为220VAC/50Hz 
6.2接通电源 
   将电流电阻量程置于 104 档,电压量程置于10V，然后开机。
6.3调零 
在“Rx”两端开路的情况下,调零使电流表的显示为0000 .注意：在“Rx”两端不开路，如接在电阻箱或被测量物体上时调零后测量会产生很大的误差。一般一次调零后在测试过程中不需再调零。 完毕后关机。
6.4连接线路 
    接好测试线，将测试线将主机与屏蔽箱连接好，测体积电阻时测试按钮拨到Rv边，测表面电阻时测试按钮拨到Rs边。然后开机。
6.5选择合适的测量电压 
★电压选择开关在后面板，注意，在测试过程中不要随意改动测量电压，可能因电压的过高或电流过大损坏被测试器件或测试仪器; 
6.6测试 
测量时从低档位逐渐拔往高档，每拨一次稍停留1～2秒以使观察显示数字， 当被测电阻大于仪器测量量程时，电阻表显示“1”，此时应继续将仪器拨到量程更高的位置，当测量仪器有显示值时应停下，当前的数字乘以档次即是被测电阻值。当有显示数字时不要再往更高次档拨，否测仪器会过量程，机内保护电路开始工作，仪器测量准确度会下降。 
6.7 测试完毕将电阻电流量程拔至“104 ”档，电压量程调至10V后关闭电源
★每测量一次均应将量程开关拨回到104“调零”档的量程位置以免开机或测量端短路时而损坏仪器。
6.8 测量电流及1015Ω以上超高电阻的测量应用测量电流后用欧姆定律以电压除以电流计算电阻的方法，详见8.5节内容。
6.9 体积电阻和表面电阻转换
★在测试过程中，使用屏蔽箱在进行体积电阻和表面电阻转换时，必须把电源关闭后进行档位转换，否则会导致电压冲击到主机无法显示或损坏。

Meet the standards and scope of application:
In full compliance with national standards GB14102006 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.
This instrument can measure the volume resistivity and surface resistivity or conductivity of different materials (solid, powder or liquid) with different measuring electrodes. Suitable for the measurement of the volume and surface resistance of rubber, plastics, film, powder, liquid, and solid and paste shapes. In addition to the measurement of resistance of the instrument, but also can directly measure the weak current.
Meet the standards:
GB1410 "test method for insulation resistance, volume resistance coefficient and surface resistance of solid electrical insulating materials"
Test method for DC resistance or conductance of insulating materials by D257 ASTM
Summary:
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. High resistance meter and current with dual 3.1/2 bit digital direct display resistance. The measurement range is from 1 * 104 to 1 * 1018, which is the most wide measurement range and the highest accuracy. The current measurement range is 2 * 10-4 ~ 1 * 10-16A. The test voltage of the machine is adjustable for 10/50/100/250/500/1000V. The instrument has the advantages of high precision, display quickly, good stability, easy reading for inspection to the anti electrostatic products such as anti-static shoes, anti electrostatic plastic and rubber products, computer room anti static floor resistance value and insulating materials electrical and electronic products insulation resistance measurement. In addition to the measurement of resistance of the instrument, but also can directly measure the weak current.
Technical index:
1, resistance measurement range: 1 * 104 ~ 1 * 1018.
2, the current measurement range is: 2 x 10-4A ~ 1 x 10-16A
3, double headers: 3.1/2 LED display
4, built-in test voltage: 10V, 50V, 100V, 250, 500, 1000V
5, basic accuracy: 1% (* Note)
6, the use of the environment: temperature: 0 degrees Celsius to 40 degrees Celsius, the relative humidity of <80%
7, the machine test voltage: 10/50/100/250/500/1000V 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
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.
Typical applications:
1 measure the resistance value of the anti-static shoes and conductive shoes.
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 of insulating materials (rate)
5, photoelectric diode dark current measurement
6, physics, optics and materials research
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
Using method:
6.1 connect the power cord.
Make sure the power supply is 220VAC/50Hz
6.2 power on
The current resistance range in 104 stalls, the voltage range of 10V, and then boot.
6.3 zero adjustment
In the open at both ends of the Rx, zero to ammeter display 0000. Note: at both ends of the "RX" does not open, such as connected to the resistor or measured object tune zero measurement will produce great error. Generally after a zero adjustment in the test process does not need to adjust the zero. After shutdown.
6.4 link line
Connect the test line, the test line will be connected to the host and the shield box, the measurement of the volume resistance when the test button dial to the Rv side, the test surface resistance when the test button to dial the Rs edge. Then boot.
6.5 select the appropriate measurement voltage
9:28 voltage selector switch on the rear panel, pay attention to, in the testing process do not arbitrarily change the voltage measurement may due to excessive voltage or current too damaged device under test or test instrument.
6.6 test
Measurements from low-grade gradually pulling to high-grade, each allocated a slightly stay 1 ~ 2 seconds to enable observation of the digital display, when more than the range of measurement instrument measured resistance, resistance meter display "1", at this time, should continue to be instrument dials to range higher position, when the measurement apparatus with display value should be stopped, the number is multiplied by the grade is measured resistance values. When there is a display of the number, do not go to a higher speed dial, no measuring instrument will be over range, machine