本儀器是既可測量高電阻，又可測微電流。采用了美國In公司的大規(guī)模集成電路以及技術(shù),使儀器體積小、重量輕、準(zhǔn)確度高。

北京北廣精儀儀器設(shè)備有限公司

體積電阻率表面電阻率測試儀
數(shù)字超高阻、微電流測量儀    型號：EST-121：體積電阻率,表面電阻率   用途：儀器儀表檢測試驗(yàn)
一、體積電阻率表面電阻率測定儀概述
本儀器是既可測量高電阻，又可測微電流。采用了美國In公司的大規(guī)模集成電路以及技術(shù),使儀器體積小、重量輕、準(zhǔn)確度高。以雙3.1/2 位數(shù)字直接顯示電阻的高阻計(jì)和電流。量限從1×104Ω ～1×1018 Ω，是目前國內(nèi)測量范圍zui寬，準(zhǔn)確度zui高的數(shù)字超高阻測量儀。電流測量范圍為2×10-4 ～1×10-16Ａ。機(jī)內(nèi)測試電壓為10/50/100/250/500/1000V任意可調(diào)。本儀器具有精度高、顯示迅速、性好穩(wěn)定、讀數(shù)方便， 適用于防靜電產(chǎn)品如防靜電鞋、防靜電塑料橡膠制品、計(jì)算機(jī)房防靜電活動(dòng)地板等電阻值的檢驗(yàn)以及絕緣材料和電子電器產(chǎn)品的絕緣電阻測量。本儀器除能測電阻外，還能直接測量微弱電流。
 
儀*符合并優(yōu)于國家標(biāo)準(zhǔn)GB1410《固體電工絕緣材料絕緣電阻、體積電阻系數(shù)和表面電阻試驗(yàn)方法》和美國標(biāo)準(zhǔn)ASTM D257《絕緣材料的直流電阻或電導(dǎo)試驗(yàn)方法》等標(biāo)準(zhǔn)的要求。
二、體積電阻率表面電阻率測試儀主要特點(diǎn)
電阻測量范圍寬 0.01×104Ω ～1×1018 Ω
電流測量范圍為 2×10-4Ａ ～1×10-16Ａ
體積小、重量輕、準(zhǔn)確度高
電阻、電流雙顯示
性能好穩(wěn)定、讀數(shù)方便
 
所有測試電壓（10/50/100/250/500/1000V） 測試時(shí)電阻結(jié)果直讀，免去老式高阻計(jì)在不同測試電壓下或不同量程時(shí)要乘以系數(shù)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
 
適用范圍廣:適用于防靜電產(chǎn)品如防靜電鞋、防靜電塑料橡膠制品、計(jì)算機(jī)房防靜電活動(dòng)地板等電阻值的檢驗(yàn)和電子電器產(chǎn)品的絕緣電阻測量
三、體積電阻率表面電阻率測試儀技術(shù)指標(biāo)
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. 雙表頭顯示: 3.1/2位LED顯示
4. 內(nèi)置測試電壓： 10V、50V、100V、250、500、1000V
5. 基本準(zhǔn)確度：1% （*注）
6 使用環(huán)境: 溫度：0℃～40℃，相對濕度<80%
7 機(jī)內(nèi)測試電壓: 10/50/100/250/500/1000V 任意切換
8.供電形式: AC 220V，50HZ，功耗約5W
四、體積電阻率表面電阻率測試儀工作原理
      根據(jù)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(tǒng)的高阻計(jì)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(shí)，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(gè)刻度是非線性的。又由于測量不同的電阻時(shí)，其電壓V也會(huì)有些變化，所以普通的高阻計(jì)是精度差、分辨率低。
 
同時(shí)測出電阻兩端的電壓V和流過電阻的電流I，通過內(nèi)部的大規(guī)模集成電路完成電壓除以電流的計(jì)算，然后把所得到的結(jié)果經(jīng)過A/D轉(zhuǎn)換后以數(shù)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(shí)變化，其顯示的電阻值不象普通高阻計(jì)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(fā)生變化對其結(jié)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(shí)際誤差可以做到千分之幾或萬分之幾。
典型應(yīng)用
1．測量防靜電鞋、導(dǎo)電鞋的電阻值
2、測量防靜電材料的電阻及電阻率
3、測量計(jì)算機(jī)房用活動(dòng)地板的系統(tǒng)電阻值
4、測量絕緣材料電阻（率）
5、光電二極管暗電流測量
6、物理,光學(xué)和材料研究
北廣公司其它絕緣材料檢測儀器:

BDJC-0-100KV 介電擊穿試驗(yàn)儀

BDJC系列絕緣材料工頻率介電擊穿試驗(yàn)儀

BDJC系列電壓介電強(qiáng)度試驗(yàn)儀器

BDJC系列 電壓擊穿試驗(yàn)儀

BDJC系列絕緣漆漆膜擊穿強(qiáng)度試驗(yàn)儀

BDJC電容器紙工頻電壓擊穿試驗(yàn)儀

EST-121 體積表面電阻率測定儀

GDAT-A介質(zhì)損耗測試儀/介電常數(shù)測試儀

GDAT-C新型介電常數(shù)介質(zhì)損耗測試儀

BDH 耐漏電起痕試驗(yàn)儀

BDH-B耐電弧試驗(yàn)儀

中國檢測行業(yè)與驗(yàn)證服務(wù)的*者和智領(lǐng)者，幫助眾多檢測質(zhì)檢單位和學(xué)校教研單位提供一站式的全面質(zhì)量解決方案。

注重每一個(gè)細(xì)節(jié)是北廣公司對于每個(gè)客戶的承諾 ， 也是北廣公司一直追求的宗旨。北京北廣精儀儀器設(shè)備有限公司   

Volume resistivity of surface resistivity tester
Digital high resistance, a current measuring instrument type: EST-121: volume resistivity, surface resistivity uses: Instrumentation Test
One, volume resistivity surface resistivity tester overview
This instrument can measure high resistance, and measuring current. The American company In large scale integrated circuit and patented technology, the instrument has the advantages of small volume, light weight, high accuracy. Dual 3.1/2 digital display the resistance high resistance meter and current. Limit from 1× 104 Ω～ 1× 1018 Ω, is currently the most wide measurement range, the most accurate digital ultra high resistance meter. Current measurement range of 2× 10-4 ～ 1× 10-16A. The built-in test voltage is 10/50/100/250/500/1000V adjustable. The instrument has the advantages of high precision, good stability, showing a rapid, easy reading, applied to anti-static products such as anti-static shoes, anti-static plastic rubber products, computer room anti-static floor activities such as the resistance value of the test as well as insulating materials electrical and electronic products insulation resistance measurement. The instrument can measure the resistance, and can directly measure the weak current.
Instrument is fully consistent with and better than the national standard GB1410 " solid electrical insulating materials, insulation resistance, volume resistivity and surface resistance test method " and " American Standard ASTM D257 DC resistance or conductance of insulating materials test methods " and other standards.
Two, volume resistivity surface resistivity tester main features
Resistance measuring range 0.01× 104 Ω～ 1× 1018 Ω
Current measurement range of 2× 10-4A ～ 1× 10-16A
Small volume, light weight, high accuracy
Resistance, current double display
Good performance is stable, easy reading
All the test voltage （ 10/50/100/250/500/1000V ） test resistance results in reading, is removed from the old high resistance meter in different test voltage or different scale should be multiplied by the coefficient of the inconvenient trouble, allowing the measurement of 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
Wide application: applied to anti-static products such as anti-static shoes, anti-static plastic rubber products, computer room anti-static floor activities such as resistance testing electrical and electronic products insulation resistance measurement
Three, volume resistivity surface resistivity tester technical indicators
The 1 resistor measurement range: 0.01× 104 Ω～ 1× 1018 Ω.
The 2 current measurement range : 2 × 10-4A～ 1 × 10-16A
3 double header display: 3.1/2 LED display
4 built-in test voltage: 10V, 50V, 100V, 250, 500, 1000V
5 basic accuracy: 1% （ note ）
6: use environment temperature: 0℃ ~ 40 ℃, relative humidity <80%
7 built-in test voltage: 10/50/100/250/500/1000V arbitrary switching
The 8 power supply forms: AC 220V, 50HZ, power consumption is about 5W
Four, volume resistivity surface resistivity meter working principle
According to the Ohm's law, the measured resistance is equal to voltage is applied through Rx V divided by the current I. The traditional high resistance meter is the working principle of measuring voltage V fixed, by measuring the current flows through the sampling resistor I to get the value of resistance. From Ohm's law can be seen, because the current I is inversely proportional to the resistance, but not proportional to the resistance, so the display value is nonlinear, namely the resistance to infinity, the current is zero, i.e., zero is∞, in the vicinity of the scale is very dense, with a low resolution. The scale is nonlinear. Because the measurement of different resistance, the voltage V also vary, so the average high resistance meter is poor accuracy, low resolution.
At the same time measure the voltage across the resistor V and the current through the resistor I, through the interior of the large scale integrated circuit to complete the voltage divided by the current calculation, and then the results obtained after A/D conversion to digital show resistance, even if the voltage across the resistor V and the current through the resistor I is changed at the same time, the display resistance value is not as common due to high resistance meter that measured voltage or current change of V I change, so, even if the measured voltage, resistance, power supply voltage is measured the changes in the results have little effect, the measurement accuracy is very high （ patent ）, theoretically the error can be zero, while the actual error can be done a few thousandths or extremely few.
Typical application
1 measurements of anti-static shoes, conductive shoes resistance value
2, measurement of the antistatic material resistance and resistivity
3, measurement computer room with movable floor system resistance
4, measurement of insulation resistance （ rate）
5, photodiode dark current measurement
6, physics, optics and materials research
Canton company other insulating materials testing instruments:
BDJC-0-100KV dielectric breakdown testing instrument
BDJC series insulating materials at power frequencies of dielectric breakdown test instrument
BDJC series voltage dielectric strength test apparatus
BDJC series voltage breakdown testing instrument
BDJC series insulating paint film breakdown strength tester
BDJC capacitor voltage breakdown testing instrument
EST-121 volume surface resistivity measuring instrument
GDAT-A dielectric loss tester / dielectric constant test
GDAT-C model dielectric constant dielectric loss tester
BDH leakage resistance tester
BDH-B arc resistance tester
China Inspection and certification services tip and inlectual leader, helped many testing quality inspection units and schools and research units to provide comprehensive one-stop quality solutions.
Pay attention to every detail is Canton company for each customer commitment, and North Canton company has been pursuing the aim of. Beijing North Canton precision instrument equipment limited