【正文】 or from the circuit welding one end of the next. 若測(cè)得的阻值為無(wú)窮大，則說(shuō)明此熔斷電阻器已失效開(kāi)路，若測(cè)得的阻值與標(biāo)稱(chēng)值相差甚遠(yuǎn)，表明電阻變值，也不宜再使用。 In the circuit, when the fuse resistor fuse open circuit, may make judgments based on experience: If it is found fusing resistor surface black or charred, it can be concluded its overloaded by more than its current rating due to many times。 color ring while resistance is able to mark to determine the color wheel, but is best when used with a multimeter to test the actual resistance. 2 水泥電阻的檢2 .cement resistance testing. 檢測(cè)水泥電阻的方法及注意事項(xiàng)與檢測(cè)普通固定電阻完全相同。If not match, exceed the error range, then change the value of the resistor 注意：測(cè)試時(shí)，特別是在測(cè)幾十 k Ω以上阻值的電阻時(shí)，手不要觸及表筆和電阻的導(dǎo)電部分；被檢測(cè)的電阻從電路中焊下來(lái)，至少要焊開(kāi)一個(gè)頭，以免電路中的其他元件對(duì)測(cè)試產(chǎn)生影響，造成測(cè)量誤差；色環(huán)電阻的阻值雖然能以色環(huán)標(biāo)志來(lái)確定，但在使用時(shí)最好還是用萬(wàn)用表測(cè)試一下其實(shí)Note: The test, especially in the test scores of more than k Ω resistor values, the hands do not touch the table and the resistance of the conductive part of the pen。 10% or 177。 Readings and the difference between the nominal resistance value is allowed 177。 10 ％或177。According to a different level of resistance errors. 讀數(shù)與標(biāo)稱(chēng)阻值之間分別允許有177。 Since Ohm block scale nonlinear relationship, it39。The two tables T (regardless of positive or negative) between two ends of pinphase resistance can be measured by the actual resistance value. 為了提高測(cè)量精度，應(yīng)根據(jù)被測(cè)電阻標(biāo)稱(chēng)值的大小來(lái)選擇量程。英文 摘自：電子電腦報(bào)元器件的檢測(cè)是家電維修的一項(xiàng)基本功，如何準(zhǔn)確有效地檢測(cè)元器件的相關(guān)參數(shù)，判斷元器件的是否正常，不是一件千篇一律的事，必須根據(jù)不同的元器件采用不同的方法，從Component detection is an appliance repair basics, how to accurately and effectively detect the ponents of the relevant parameters to determine whether the normal ponent is not a cookiecutter thing, must be based on the different ponents use different methods to determine ponents normal or not. 特別對(duì)初學(xué)者來(lái)說(shuō)，熟練掌握常用元器件的檢測(cè)方法和經(jīng)驗(yàn)很有必要，以下對(duì)常用電子元器件的檢測(cè)經(jīng)驗(yàn)和方法進(jìn)行介紹供對(duì)考。 Especially for beginners, proficiency in monly used ponents of the detection methods and experience is essential, the following pairs of electronic ponents monly used method of testing experience and are introduced for the right test. Ⅰ一、電阻器的檢測(cè)方法與經(jīng)驗(yàn)：.resistors detection methods and experiences: 1  resistor testing.TA 將兩表筆 ( 不分正負(fù) ) 分別與電阻的兩端引腳相接即可測(cè)出實(shí)際電阻值。 In order to improve measurement accuracy, measured resistance should be based on the size of the nominal value of the chosen range. 由于歐姆擋刻度的非線(xiàn)性關(guān)系，它的中間一段分度較為精細(xì)，因此應(yīng)使指針指示值盡可能落到刻度的中段位置，即全刻度起始的 20 ％～ 80 ％弧度范圍內(nèi)，以使測(cè)量更準(zhǔn)確。s the middle of a period of more refined indexing and should therefore be directed to the pointer value is the middle position as far as possible fall into the scale, that is the start of full scale of 20% to 80% within the arc, to to make measurements more accurate. 根據(jù)電阻誤差等級(jí)不同。 5 ％、177。 20 ％的誤差。 5%, 177。 20% error. 如不相符，超出誤差范圍，則說(shuō)明該電阻值變值了。 detected resistance welding down from the circuit, at least to open a welding head, so as to avoid circuit testing have an impact on other ponents, resulting in measurement error。 Detection of resistance of cement and detection methods and note exactly the same as ordinary fixed resistor. 3 熔斷電阻器的3 .fuse resistor testing. 在電路中，當(dāng)熔斷電阻器熔斷開(kāi)路后，可根據(jù)經(jīng)驗(yàn)作出判斷：若發(fā)現(xiàn)熔斷電阻器表面發(fā)黑或燒焦，可斷定是其負(fù)荷過(guò)重，通過(guò)它的電流超過(guò)額定值很多倍所致；如果其表面無(wú)任何痕跡而開(kāi)路，則表明流過(guò)的電流剛好等于或稍大于其額定熔斷值。 If the surface without any trace of the open, this indicates that the current flow is just equal to or slightly larger than the value of its rated fuse. 對(duì)于表面無(wú)任何痕跡的熔斷電阻器好壞的判斷，可借助萬(wàn)用表 R1 擋來(lái)測(cè)量，為保證測(cè)量準(zhǔn)確，應(yīng)將熔斷電阻器一端從電路上焊下。 If the measured resistance is infinite, then the fuse resistor has failed open circuit, if the measured resistance and the,nominal value falls far short of that change resistance values, we should not be used. 在維修實(shí)踐中發(fā)現(xiàn)，也有少數(shù)熔斷電阻器在電路中被擊穿短路的現(xiàn)象，檢測(cè)時(shí)也應(yīng)予以注Maintenance practices found that a small number of fuseresistor in the circuit was shortcircuit breakdown phenomena, testing, also should be noted. 4 電位器的檢測(cè)4 .potentiometer detection. 檢查電位器時(shí)，首先要轉(zhuǎn)動(dòng)旋柄，看看旋柄轉(zhuǎn)動(dòng)是否平滑，開(kāi)關(guān)是否靈活，開(kāi)關(guān)通、斷時(shí) 喀噠 聲是否清脆，并聽(tīng)一聽(tīng)電位器內(nèi)部接觸點(diǎn)和電阻體摩擦的聲音，如有 沙沙 聲，說(shuō)明質(zhì)量不好。 With the multimeter test, the first according to the size of the tested potentiometer resistance, choose the appropriate resistance gear a good multimeter, and then the following method may be 用萬(wàn)用表的歐姆擋測(cè) 1 、 2 兩端，其讀數(shù)應(yīng)為電位器的標(biāo)稱(chēng)阻值，如萬(wàn)用表的指針不動(dòng)或阻值相差很多，則表明該電位器已損壞Block measured with a multimeter ohm 1, 2 at both ends, the reading should be nominal potentiometer resistance, such as the meter pointer does not move or resistance is far too small, then show that the potentiometer is damaged. B 檢測(cè)電位器的活動(dòng)臂與電阻片的接觸是否良好。 Ohm39。 Handle clockwise rotation axis and then slowly, the resistance value should be increased gradually, the table header pointer should be a smooth move. 當(dāng)軸柄旋至極端位置 3 時(shí)，阻值應(yīng)接近電位器的標(biāo)稱(chēng)值。 Such as the multimeter pointer in the handle potentiometer shaft rotation in the process of beating the phenomenon, indicating activities, contacts are being exposed failures. 5 正溫度系數(shù)熱敏電阻 (PTC) 的檢測(cè)5. positive temperature coefficient thermistor (PTC) detection. 檢測(cè)時(shí)，用萬(wàn)用表 R1 擋，具體可分兩步操作： A 常溫檢測(cè) ( 室內(nèi)溫度接近 25 ℃ ) ；將兩表筆接觸 PTC 熱敏電阻的兩引腳測(cè)出其實(shí)際阻值，并與標(biāo)稱(chēng)阻值相對(duì)比，二者相差在177。 Detection with a multimeter R 1 block, concrete can be a twostep operation:temperature detection (indoor temperature close to 25 ℃)。 2 Ω in the normal. 實(shí)際阻值若與標(biāo)稱(chēng)阻值相差過(guò)大，則說(shuō)明其性能不良或已損壞。heat detection。 Be careful not to make the heat source and the PTC thermistor by too close or direct contact thermal resistance, in order to prevent their Tanghuai. 6 負(fù)溫度系數(shù)熱敏電阻 (NTC) 的檢測(cè)6. negative temperature coefficient thermistor (NTC) detection. (1) 、測(cè)量標(biāo)稱(chēng)電阻值 R(1), measured nominal resistance value Rt 用萬(wàn)用表測(cè)量 NTC 熱敏電阻的方法與測(cè)量普通固定電阻的方法相同，即根據(jù) NTC 熱敏電阻的標(biāo)稱(chēng)阻值選擇合適的電阻擋可直接測(cè)出 Rt 的實(shí)際值。 But NTC thermistor is sensitive to temperature, so testing should note the following: Rt is a manufacturer of environmental temperature measured at 25 ℃, so the measure with the multimeter Rt should also be at ambient temperature when close to 25 ℃ in order to ensure the credibility