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：體積電阻率測試儀,表面電阻率 測試儀，固體絕緣材料電阻率測試儀  用途：儀器儀表檢測試驗
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,使儀器體積小、重量輕、準確度高。以雙3.1/2 位數(shù)字直接顯示電阻的高阻計和電流。量限從1×104Ω ～1×1018 Ω，是目前國內(nèi)測量范圍zui寬，準確度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(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)于國家標準GB1410《固體電工絕緣材料絕緣電阻、體積電阻系數(shù)和表面電阻試驗方法》和美國標準ASTM D257《絕緣材料的直流電阻或電導試驗方法》等標準的要求。
二、體積電阻率表面電阻率測試儀主要特點
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(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、計算機房防靜電活動地板等電阻值的檢驗和電子電器產(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. 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. 基本準確度：1% （*注）
6 使用環(huán)境: 溫度：0℃～40℃，相對濕度<80%
7 機內(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

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