【正文】 test. B 測(cè)量功率不得超過規(guī)定值，以免電流熱效應(yīng)引起測(cè)量誤差。 attention to proper operation. 測(cè)試時(shí)，不要用手捏住熱敏電阻體，以防止人體溫度對(duì)測(cè)試產(chǎn)生影響。First measured at room temperature under t1 resistance Rt1, electric iron to heat and then, near the thermistor Rt, measure the resistance RT2, the same time, measured with the thermometer at this time the surface of the thermistor RT and then calculated the average temperature t2. 7  testing. 用萬用表的 R1k 擋測(cè)量壓敏電阻兩引腳之間的正、反向絕緣電阻，均為無窮大，否則，說明漏電流大。If the measured resistance is very small, shows varistors have been damaged and can not be used. 8 光敏電阻的檢測(cè)。 This value shows the bigger the better performance of lightsensitive resistors. 若此值很小或接近為零，說明光敏電阻已燒穿損壞，不能再繼續(xù)使用。 will be a light source aligned photosensitive resistance translucent window, this time multimeter pointer should be more substantial swing, resistance significantly reduced. 此值越小說明光敏電阻性能越好。 If this value is great or even infinite, indicating that the internal resistance of open photosensitive damage, can no longer continue to 將光敏電阻透光窗口對(duì)準(zhǔn)入射光線，用小黑紙片在光敏電阻的遮光窗上部晃動(dòng)，使其間斷受光，此時(shí)萬用表指針應(yīng)隨黑紙片的晃動(dòng)而the photosensitive resistance translucent window aligned incident light line, with the black pieces of paper in the upper window shading photosensitive resistor shaking to break by the light, this time with the black pieces of paper multimeter pointer should be about the rock and swing. 如果萬用表指針始終停在某一位置不隨紙片晃動(dòng)而擺動(dòng)，說明光敏電阻的光敏材料已經(jīng)損壞。10pF capacitors due to the following fixedsize too small to measure with the multimeter, only a qualitative check whether there is leakage, the internal short circuit or breakdown phenomenon. 測(cè)量時(shí)，可選用萬用表 R10k 擋，用兩表筆分別任意接電容的兩個(gè)引腳，阻值應(yīng)為無窮大。 If the measured resistance (pointer to the right swing) is zero, then capacitor leakage damage or internal breakdown. B 檢測(cè) 10PF ～ 0  01 μ F 固定電容器是否有充電現(xiàn)象，進(jìn)而判斷其好Detection 10PF ~ μ F capacitor whether there is a fixed charge phenomenon, and then judge its good or bad. 萬用表選用 R1k 擋。 2 transistor β values are above 100, and the current penetration is smaller. 可選用 3DG6 等型號(hào)硅三極管組成復(fù)合管。 Multimeter39。 As the posite transistor amplification, the process of charging and discharging capacitor under test to be larger, so that the pointer of swing meter increase, and thus easy to observe. 應(yīng)注意的是：在測(cè)試操作時(shí)，特別是在測(cè)較小容量的電容時(shí)，要反復(fù)調(diào)換被測(cè)電容引腳接觸 A 、 B 兩點(diǎn)，才能明顯地看到萬用表指針的擺動(dòng)。 For μ F or above a fixed capacitor can be used multimeter R 10k block directly test whether the process of charging capacitor, as well as whether the internal short circuit or leakage, and can swing under the pointer to the right size to estimate the magnitude of the capacity of capacitors . 2 電解電容器的檢測(cè)2. electrolytic capacitor testing A 因?yàn)殡娊怆娙莸娜萘枯^一般固定電容大得多，所以，測(cè)量時(shí)，應(yīng)針對(duì)不同容量選用合適的量程Because the capacity of electrolytic capacitors is much greater than the average fixed capacitor, therefore, measurements should be the appropriate choice of different capacities range. 根據(jù)經(jīng)驗(yàn)，一般情況下， 1 ～ 47 μ F 間的電容，可用 R1k 擋測(cè)量，大于 47 μ F 的電容可用 R100 擋測(cè)量。The multimeter red pen then negative, then positive black table pen, in the new to the moment, multimeter pointer that the right side deflection of a larger degree (for the same power to block the capacity the greater the greater the swing), and then gradually to the left turn, until the stop at a certain location. 此時(shí)的阻值便是電解電容的正向漏電阻，此值略大于反向漏電阻。 Actual experience has shown that the leakage resistance of electrolytic capacitors in general should be more than a few hundred k Ω, otherwise, it will not work properly. 在測(cè)試中，若正向、反向均無充電的現(xiàn)象，即表針不動(dòng)，則說明容量消失或內(nèi)部斷路；如果所測(cè)阻值很小或?yàn)榱?，說明電容漏電大或已擊穿損壞，不能再使用。if the measured resistance of very small or zero, indicating large capacitor leakage or breakdown damaged, can not be used again. C 對(duì)于正、負(fù)極標(biāo)志不明的電解電容器，可利用上述測(cè)量漏電阻的方法加以判別。 Which is to look at any measure leakage resistance, remember its size, and then swap the table T and then measured by a resistance. 兩次測(cè)量中阻值大的那一次便是正向接法，即黑表筆接的是正極，紅表筆接的是負(fù)極。 power to block the use of multimeter, using electrolytic capacitors to be positive, the reverse charge method, according to the size of a pointer to the right swings can estimate a capacity of electrolytic capacitors. 3 可變電容3. variable capacitor testing A 用手輕輕旋動(dòng)轉(zhuǎn)軸，應(yīng)感覺十分平滑，不應(yīng)感覺有時(shí)松時(shí)緊甚至有卡滯現(xiàn)象。 Will contain the axial front, back, up, down, left and right in various directions and promotion, the shaft should not be loose phenomenon. B 用一只手旋動(dòng)轉(zhuǎn)軸，另一只手輕摸動(dòng)片組的外緣，不應(yīng)感覺有任何松脫現(xiàn)象。 Poor contact between the shaft and the moving film of the variable capacitor, can not continue to use. C 將萬用表置于 R10k 擋，一只手將兩個(gè)表筆分別接可變電容器的動(dòng)片和定片的引出端，另一只手將轉(zhuǎn)軸緩緩旋動(dòng)幾個(gè)來回，萬用表指針都應(yīng)Will be placed in R 10k block multimeter, a pen in hand the two tables were then fixed variable capacitor chips and fixed film leads to side, the other hand to slowly rotating shaft a few back and forth, multimeter pointer are infinite position should be fixed. 在旋動(dòng)轉(zhuǎn)軸的過程中，如果指針有時(shí)指向零，說明動(dòng)片和定片之間存在短路點(diǎn)；如果碰到某一角度，萬用表讀數(shù)不為無窮大而是出現(xiàn)一定阻值，說明可變電容器動(dòng)片與定片之間存在漏電現(xiàn)象。 If you hit a certain point of view, multimeter reading is not infinite, but many will certainly resistance, indicating a variable capacitor move exists between the film and the stator leakage phenomenon. 三、電感器、變壓器檢測(cè)方Ⅲ.Inductors, transformers detection methods and experience 1 色碼電感器的的檢1. color code inductor test 將萬用表置于 R1 擋，紅、黑表筆各接色碼電感器的任一引出端，此時(shí)指針應(yīng)向右擺動(dòng)。 (2) 初級(jí)繞組與外殼之間的電阻值；(2) the primary winding and the resistance value between the shell。(3) secondary winding and the resistance value between the shell. 上述測(cè)試結(jié)果分出現(xiàn)三(1) 阻值為無窮大：正常；(4) The resistance is infinity: normal。 (3) 阻值小于無窮大，但大于零：有漏電性故障。 Such as the coil wire is broken, Sealingoff, insulation materials, whether there are scorch marks, whether the core fastening screw loose, whether silicon steel corrosion, whether there are exposed coil windings, etc.. B 絕緣性測(cè)試。 R 10k block with the multimeter were measured core and primary, primary with the secondary, with the subco