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[供應]橡膠表面電阻率測定儀
*的被測電阻、和流過電阻的電流雙顯示，使操作測量更加方便；
ZST-121橡膠表面電阻率測定儀
一 概述
本儀器既可測量超高電阻，又可測極微弱電流。采用了大規模集成電路以及的技 術，使儀器體積小、重量輕、準確度高。以數字液晶顯示電阻并同時直接顯示流過被測電阻的電流。電阻量程從1×104Ω ～1×1018Ω， 電流測量范圍 為2 ×10-4A ～1 ×10-16A。機內測試電壓為DC10V、50V、100V、250V、500V、1000V。
本儀器具有精度高、顯示迅速、穩定性好、讀數方便, 適用于防靜電產品 如防靜電鞋、防靜電塑料橡膠制品、計算機房防靜電活動地板等電阻值的檢驗以及絕緣材料和電子電器產品的絕緣電阻測量。本儀器除能測電阻外，還能直接測量電流如電子器件暗電流等。
二 主要特點
電阻測量范圍 1×104Ω ～1×1018 Ω；
電流測量范圍 2×10-4Ａ ～1×10-16Ａ；
體積小、重量輕、準確度高；
*的被測電阻、和流過電阻的電流雙顯示，使操作測量更加方便；
性能穩定、讀數方便；
既能測電阻又能測電流；
測試電壓有六種選擇DC10V、50V、100V、250V、500V、1000V；
使用操作簡便，在任何電阻量程和測試電壓下均直接讀顯示數字結果，免去要乘以一個系數的麻煩，使測量超高電阻就如用萬用表測量普通電阻樣簡便。
三 主要應用范圍
材料高阻測試測量如防靜電產品（防靜電鞋、防靜電塑料橡膠制品、計算機房防靜電活動地板等）電阻值的檢測；材料體電阻(率)和表面電阻(率)測量；電化學和材料測試,以及物理,光學和材料研究;微弱電流測量如光電效應和器件暗電流測量。
四 技術指標
1. 電阻測量范圍： 1×104Ω ～1×1018Ω，分為十個量程。
2. 電流測量范圍為2×10-4A ～1×10-16A
3. 全數字液晶屏顯示。
4. 準確度: 準確度優于下表
量程 有效顯示范圍 20～30℃ RH<80%
104 0.01~19.99 1%
105 0.01～19.99 1%
106 0.01～19.99 1%
107 0.01～19.99 1%
108 0.01～19.99 1%
109 0.01～19.99 1%
1010 0.01～19.99 5%+2字
1011 0.01～19.99 5%+2字
1012 0.01～19.99 5%+5字
1013 0.01～19.99 10%+5字
1014 0.01～19.99 10%+5字
1014以上 0.01～19.99 10-15%+5字
( 超出有效顯示范圍時誤差有可能增加)測試電流準確度與電阻相同測試電壓準確度為 10%
5. 使用環境: 溫度 -10℃～50℃ 相對濕度<90%。
6. 測試電壓: DC10V、50V、100V、250V、500V、1000V。±10%
7. 供電形式: AC 220V，50HZ，功耗約10W。
8. 儀器尺寸: 300ｍｍ× 280ｍｍ× 150 mm。
9. 質量: 約3.0KG。
五 工作原理
根據歐姆定律，被測電阻R等于施加電壓V除以通過的電流I。即
V
R= ---
I
傳統的儀器的工作原理是測量電壓V固定，通過測量流過被測物體的電流I以標定電阻的刻度來讀出電阻值。從上式可以看出，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，所以普通的高阻計的精度是很難提高的。
ZST-121體積、表面電阻率測定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。
An overview
This instrument can measure both ultra high resistance, and can be measured extremely weak current. Using large scale integrated circuit and new patent technology, the instrument has the advantages of small volume, light weight, high accuracy. With digital liquid crystal displayresistance and directly display the current flows through the measured resistance. Resistance range from 1 * 104 to 1 * 1018 Omega Omega, current measuring range of 2 * 10-4A to 1 * 10-16A. The built-in test voltage of DC10V, 50V, 100V, 250V, 500V, 1000V.
The instrument has high precision, good stability, showing rapid, convenient reading, suitable for insulation resistance measurement in anti-static products such as anti-static shoes, anti-static plastic and rubber products, anti static floor computer room inspection such as value of resistance and insulation materials and electronic products. In addition to the instruments can measure resistance, can also direct current measurements such as the electronic devices such as dark current.
The two main features
Resistance measurement range of 1 * 104 to 1 * 1018 Omega omega;
The current measurement range of 2 * 10-4A to 1 * 10-16A;
Small volume, light weight, high accuracy;
Current flowing through the resistor, and the resistor is measured the unique dual display, make the operation more convenient measurement;
Stable performance, easy reading;
Not only can measure resistance and can measure current;
The test voltage is six choices DC10V, 50V, 100V, 250V, 500V, 1000V;
Easy to use, in any resistance range and testing voltage are directly read and display digitalresults, so it is multiplied by a coefficient of trouble, ultra high resistance as measured with a multimeter common resistance like simple measurements enable.
The three main application range
The measurement of high resistance testing materials such as anti-static products (anti-static shoes, anti-static plastic and rubber products, computer room anti-static movable floor etc.)detection resistance value; material body resistance (rate) and surface resistance (rate) and electrochemical measurement; materials testing, and physical, and material for the study of optical; weak current measurement as the photoelectric effect and dark current measurementdevice.
The four technical indicators
The 1 resistor measuring range: 1 ~ 1 * 1018 * 104 Omega Omega, divided into ten range.
The 2 current measuring range of 2 * 10-4A to 1 * 10-16A
3 all digital LCD display.
4 accuracy: the accuracy is better than the table
The range of effective display area of 20 ~ 30 DEG C RH<80%
104 0.01~19.99 1%
From 1050.01 to 19.991%
From 1060.01 to 19.991%
From 1070.01 to 19.991%
From 1080.01 to 19.991%
From 1090.01 to 19.991%
From 10100.01 to 19.99 5%+2 words
From 10110.01 to 19.99 5%+2 words
From 10120.01 to 19.99 5%+5 words
From 10130.01 to 19.99 10%+5 words
From 10140.01 to 19.99 10%+5 words
More than 1014 of 0.01 ~ 19.99 10-15%+5 words
(beyond the effective display range error may increase) test current accuracy and resistance ofthe same test voltage accuracy is 10%
5 the use of the environment: the temperature of -10 DEG to 50 DEG relative humidity <90%.
6 the test voltage: DC10V, 50V, 100V, 250V, 500V, 1000V. + 10%
7 power supply forms: AC 220V, 50HZ, power consumption is about 10W.
The 8 instrument size: 300mm x 280mm x 150 mm.
9 quality: about 3.0KG.
The five principle
According to Ohm's law, the resistance being measured R is equal to the applied voltage divided by current V by I. That is,
V
R= ---
I
The working principle of the traditional instrument measuring voltage V is fixed, by measuring the current flowing through the scale of the measured object I to calibration resistance to read out the resistance value. Can be seen from the above equation, because the current I is inversely proportional to the resistance, but not proportional, so is nonlinear resistive displayvalue, i.e., infinite resistance, current is zero, i.e. zero at the header is infinity, scale near thevery dense, with a low resolution. The scale is nonlinear. Because the resistance measurementof different voltage, the V will also be some changes, so the high resistance of ordinary meteraccuracy is difficult to improve.
ZST-121 volume and surface resistivity tester current voltage V and the flow resistance ismeasured 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 resistance, even current voltage V and the flow resistance at both ends of the I is a change at the same time, it shows the value of resistance is not like ordinaryhigh resistance meter that due to changes in the voltage to be measured changes in V or I current and change, so, even if the measure voltage, measure resistance, supply voltagechange has little influence on the results, the measuring precision is high. Theoretically the errorcan do zero. While the actual error can do a few thousandths or very few.
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