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北京北廣精儀儀器設備有限公司研發部
北京北廣精儀儀器設備有限公司研發部
體積表面電阻率測試儀*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。
BEST-121體積表面電阻率測試儀
一、 概述：
BEST- 121型高絕緣體積表面電阻測量儀用于測量絕緣材料、電工產品、各種元器件的絕緣電阻；與恒溫水浴配套后，還能測量不同溫度下的塑料電線電纜（無屏蔽層）的絕緣電阻，該儀器具有測量精度高、性能穩定、操作簡單、輸入端高壓短路等優點，儀器的zui高量程 1018Ω電阻值（測試電壓為 1000V）
本儀表貫徹 GB1410－2006 高絕緣體積電阻測量儀企業標準。
測試電壓（V）
DC—10V
DC—50V
DC—100V
DC—500V
DC—1000V
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。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、主要特點：
電阻測量范圍寬 1×104Ω ～1×1018Ω
電流測量范圍為 2×10-4Ａ ～1×10-16Ａ
體積小,重量輕,準確度高
電阻,電流雙顯示
性能好穩定,讀數方便
所有測試電壓(10V/50V/100/250/500/1000V) 測試時電阻結果直讀,免去老式高阻計在不同測試電壓下或不同量程時要乘以系數等使用不便的麻煩,使測量超高電阻就如用萬用表測量普通電阻樣簡便。既能測超高電阻又能測微電流
三,技術指標：
1,電阻測量范圍： 0.01×104Ω ～1×1018Ω。
2,電流測量范圍為： 2×10-4A～1×10-16A
3,顯 示 方 式：數字液晶顯示
4,內置測試電壓： 10V ,50V,100V,250,500,1000V
5,基本準確度：1% (*注)
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5KG
四,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
體積表面電阻率測試儀
Volume surface resistivity measuring instrument with different measuring electrodes (fixture) can measure the volume resistivity and surface resistivity or conductivity of different materials (solid, powder or liquid). 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.
Two, the main features:
Resistance measurement range x 104 x 1 x 1018 x 1
The current measurement range is 2 * 10-4A ~ 1 * 10-16A
Small in size, light in weight and high in accuracy.
Resistance, current dual display
Good performance and stable, easy to read
All the test voltage (10V/50V/100/250/500/1000V) to test the resistance results in reading, replacing the old high resistance meter in different test voltage or different scale to multiplied by the coefficient of use inconvenience trouble, enable the measurement of ultra high resistance as the multimeter is used to measure the general resistance of samples is simple. Not only can measure high resistance and micro current
Three, technical indicators:
1, resistance measurement range: 0.01 * 104 ~ 1 * 1018.
2, the current measurement range is: 2 * 10-4A ~ 1 * 10-16A
3, explicit formula: digital liquid crystal display
4, built-in test voltage: 10V, 50V, 100V, 2505001000V
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: 10V/50V/100/250/500/1000V arbitrary switching
8, the form of power supply: 220V AC, 50HZ, power consumption is about 5W
9, instrument size: 285mm * 245mm * 120 mm
10, quality: about 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 the measured voltage or current change of V I variation, so, even if the measured voltage, by measuring the resistance, the power supply voltage changes have little effect on the results, the measurement accuracy is very high (patent), theoretically the error can be zero, while the actual error can be done a few thousandths or very few.
Typical applications
1, measuring the resistance of insulating materials (rate)
2, measuring the resistance and resistivity of antistatic materials
3, measuring the system resistance value of the computer room floor
4, measure the anti-static shoes, the resistance value of conductive shoes
5. Dark current measurement of photodiode
6, physics, optics and materials research
Standard configuration:
1, test equipment: 1 sets
2, power cord: 1
3, measuring line: 3 (shielding wire, test wiring, grounding wire)
4, the instruction manual: 1 copies
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