簡要描述: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。
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ZST-121橡膠表面電阻率測試儀
一、符合標準及適用范圍:
*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(shù)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。本儀器配不同的測量電極(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、技術(shù)指標
1、電阻測量范圍: 1×104Ω ~1×1018Ω。
2、電流測量范圍: 2×10-4A~1×10-16A
3、顯 示 方 式:數(shù)字液晶顯示
4、內(nèi)置測試電壓: 10V 、50V、100V、250V、500V、1000V(任意切換)
5、基本準確度:1% (*注)
6、使用環(huán)境: 溫度:0℃~40℃,相對濕度<80%
7、供電形式: AC 220V,50HZ,功耗約5W
8、儀器尺寸: 285mm× 245mm× 120 mm
9、質(zhì)量: 約5KG
10、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
11、所有測試電壓(10V/50V/100/250/500/1000V) 測試時電阻結(jié)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。
三、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。
本臺電阻率測試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(nèi)部的大規(guī)模集成電路完成電壓除以電流的計算,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(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,而實際誤差可以做到千分之幾或萬分之幾。
四、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(tǒng)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
五、標準配置:
1、測試儀器:1臺
2、電極箱: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
5、合格證:一份
A, standard and scope of application:
In full compliance with national standards GB14102006 solid electrical insulation insulation resistance, volume resistivity and surface resistance test method of material, ASTM D257, DC resistance or conductance of insulating materials test method standards. The apparatus withdifferent measuring electrode (fixture) can measure different materials (solid, powder or liquid)of the volume resistivity and surface resistivity or conductivity. Various applicable to rubber,plastic, film, powder, liquid, and solid and pasty insulating material shape determination ofvolume and surface resistance value. In addition to the instruments can measure resistance, but also the direct measurement of weak current.
Two, technical indicators
1, resistance measuring range: 1 * 104 to 1 * 1018 Omega omega.
2, the current measuring range: 2 * 10-4A to 1 * 10-16A
3, the display mode: Digital LCD display
4, the built-in test voltage: 10V, 50V, 100V, 250V, 500V, 1000V (arbitrary switching)
5, basic accuracy: 1% (note)
6, the use of the environment: temperature: 0 to 40 DEG C, relative humidity <80%
7 power supply forms: AC, 220V, 50HZ, power consumption is about 5W
8, the instrument size: 285mm x 245mm x 120 mm
9, quality: about 5KG
10, small volume, light weight, high accuracy, resistance, current double display, performance good stability, convenient reading
11, all the test voltage (10V/50V/100/250/500/1000V) resistance results when testing direct reading, removed from the old high resistance meter in different test voltage or different rangeshould be multiplied by the coefficient etc. use inconvenience trouble, ultra high resistance asmeasured with a multimeter common resistance like simple measurements enable.
Three, the principle of work
According to Ohm's law, the resistance being measured Rx is equal to the applied voltagedivided by current V by I. The working principle of the high resistance meter is the traditionalmeasuring voltage V fixed, by measuring the current flowing through the sampling resistor I toobtain the resistance value. From Ohm's law can be seen as the current I is inversely proportional to the resistance, but not proportional, so is nonlinear resistive display value, i.e.,infinite resistance, current is zero, i.e. zero at the header is infinity, scale near the very dense,with a low resolution. The scale is nonlinear. Because the resistance measurement of differentvoltage, the V will also be some changes, so the high resistance of ordinary gauge is poor accuracy and low resolution.
The station is the current resistivity tester voltage V and flow resistance measured at the same time across the resistor I, the large scale integrated circuit internal to complete the calculation ofvoltage divided by current, then put the results obtained after A/D conversion to digital displayresistance, even current voltage V and the flow resistance at both ends of the I is at the same time change, resistance its display value does not like ordinary high resistance meter that due to changes in the voltage to be measured changes in V or I current and change, so, even if themeasure voltage, measure resistance, power supply voltage change has little influence on theresults, the measuring accuracy is very high (patent), theoretically the error can be zero, but the actual error can do a few thousandths or very few.
Four, the typical application
Insulation resistance 1, measurement (rate)
2, measurement of anti electrostatic material resistance and resistivity
3, measurement of computer room with movable floor system resistance value
Resistance of 4, measurement of anti-static shoes, conductive shoes value
5, photoelectric diode dark current measurement
6, physics, optics and material research
Five, the standard configuration:
1, test equipment: 1 sets
2, the electrode box: 1
2, the power line: 1
3, measuring line: 3 (shielding wire, test wiring, grounding wire)
4, instructions for use: 1
5, certificate: a
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