簡要描述:絕緣材料電阻率測定儀*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(shù)和表面電阻試驗方法,ASTM D257 絕緣材料的直流電阻或電導(dǎo)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(dǎo)率。
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ZST-121絕緣材料電阻率測定儀(體積表面電阻率測試儀)
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(dǎo)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(dǎo)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(yīng)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(dǎo)電鞋的電阻值
5、光電二極管暗電流測量
6、物理,光學(xué)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
使用注意事項
★高阻測量一定要嚴格按使用方法步聚進行,否則有可能造成儀器*損壞或電人。
7.1 應(yīng)在“Rx"兩端開路時調(diào)零(主機開機)
如接在電阻箱或被測量物體上時調(diào)零后測量會產(chǎn)生很大的誤差。一般一次調(diào)零后在測試過程中不需再調(diào)零,但改變測量電壓后可能要重新調(diào)零。
7.2 禁止將“Rx"兩端短路,以免微電流放大器受大電流沖擊
7.3 在測試過程中不要隨意改動測量電壓,
★隨意改動測量電壓可能因電壓的過高或電流過大損壞被測試器件或測試儀器,而且有的材料是非線性的,即電壓與電流是不符合歐姆定律,有改變電壓時由于電流不是線性變化,所以測量的電阻也會變化。
7.4 測量時從低次檔逐漸拔往高次檔
★每撥一次稍停留1~2秒以便觀察顯示數(shù)字,當有顯示值時應(yīng)停下,記錄當前的數(shù)字即是被測電阻值。若顯示“1"時,表示欠量程應(yīng)往高次檔拔。直到有顯示數(shù)字時為止。當有顯示數(shù)字時不能再往高次檔撥,否則有可能損壞儀器(機內(nèi)有過電流保護電路)。除104 Ω檔之外,當顯示低于1.99,表示過量程應(yīng)換低檔!
7.5 大部分絕緣材料,特別是防靜電材料的電阻值在加電壓后會有一定變化而引起數(shù)字變化
★由于本儀器的分辯率很高,因而會引起顯示值的末尾幾位數(shù)也變化,這不是儀器本身的問題,而是被測量對象的導(dǎo)電機理復(fù)雜而使得阻值有些變化。在這種情況下往往取2位有效數(shù)就夠了。
7.6 接通電源后,手指不能觸及高壓線的金屬部分
★本儀表有二連根線:高壓線(紅)和微電流測試線。在使用時要注意高壓線,開機后人不能觸及高壓線,以免電人或麻手。
7.7 測試過程中不能觸摸微電流測試端
★微電流測試端zui怕受到大電流或人體感應(yīng)電壓及靜電的沖擊。所以在開機后和測試過程中不能與微電流測試端接觸,以免損壞儀表。
7.8 在測量高阻時,應(yīng)采用屏蔽盒將被測物體屏蔽.
★在測量大于1010 Ω以上時,為防止外界干擾面而引起讀數(shù)不穩(wěn)。
7.9 每次測量完時應(yīng)將量程開關(guān)撥回“104 "檔再進行下次測試
在測量時應(yīng)逐漸將量程開關(guān)撥到高阻檔,測量完時應(yīng)將電流電阻量程、電壓量程開關(guān)撥回低檔。以 確保下次開機時量程開關(guān)處在低阻量程檔。
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, because 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 infinite, 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, 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 displayvalue of resistance, even current voltage V and the flow resistance at both ends of the I is at the same time, change the display value, resistance is not like ordinary high resistance meter thatdue to changes in the voltage to be measured changes in V or I current and change, so, even if the measurement of voltage, resistance, power supply voltage is measured change has little influence on the results, 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 measurement (rate), 1
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
The use of attention to matters
* high resistance measurement must be in strict accordance with the method of using steps,otherwise it may cause permanent damage or power apparatus.
7.1 should be in the "Rx" at the open end of zero (host computer)
If connected to the resistance box or an object to be measured on the tune measurement ofzero after the great error will occur. A general tone in the testing process zero does not need tozero, but change the measurement voltage may have to re zero.
7.2 ban the use of "Rx" at both ends in order to avoid short circuit, a micro current amplifier by the large current impact
7.3 in the test process, do not arbitrarily change the voltage measurement,
By randomly changing the measuring voltage may be due to the voltage is too high or too large current device is damaged or testing instrument was tested, and some material is nonlinear, i.e.,voltage and current is not accorded with Ohm's law, there is change the voltage because the current is not linear change, so the measured resistance will change.
7.4 measurements from low to higher gear gear gradually pull
* every dial again slightly stay 1 to 2 seconds in order to observe the digital display, when the display value should stop recording current digital is the measured resistance value. If the display is "1", said to owe range should be higher profile drawing. Until the display digital time.When the display numbers cannot go higher gear shifting, or they may damage the instrument(the machine of an overcurrent protection circuit). In addition to 104 ohm, when the display is less than 1.99, showing excess process should downshift!
7.5 parts of insulating material, especially the resistance of antistatic material value in voltageafter a certain change caused by digital change
* because the instrument resolution is very high, which will cause the display value of the enddigits of changes, this is not the instrument itself, the conductive mechanism but the measured object is complex and make some change in resistance. In this case often take 2 effectivenumber is enough.
7.6 after the power is switched on, the metal part of the finger can not touch the high-voltage wire
* this instrument has two line: Roots high-voltage wire (red) and micro current test line. When in use
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