Question 2: How to measure the capacitance with a digital multimeter Because the capacitance has charging characteristics, it is OK to use the resistance gear.
First, set the resistance to the highest gear, observe the value, if the capacitor is bad, that is, the capacitor breaks through the short-circuit, the resistance should be displayed as 0 ohms. If it is not bad, it should be from a value to infinity.
Question 3: How to measure capacitance with a digital multimeter If there is a digital multimeter with a capacitance file, choose the 20Uf file to measure directly. If there is no capacitance measurement function, then use the resistance of the highest gear (20M gear), the two pens of the multimeter contact capacitor two feet of the initial period, the multimeter will display a certain amount of data, and then this data is constantly getting bigger (capacitor charging and charging current in the decreasing), and finally shows the symbol of "1" (that is, the meaning of infinity), then the digital multimeter will display the data of "1". (which means infinity), then the capacitor is basically good (the specific capacity is impossible to measure). The reason why we use the largest resistance gear, because the largest resistance gear current is the smallest, the capacitor charging process is longer, easy for us to see. The smallest resistor may jump to "1", which is not easy to recognize.
Question 4: How to use a multimeter to measure capacitance? The digital multimeter can directly measure the capacitance value, the pump capacitance is exactly in its measurement range.
Pointer multimeter, to measure the capacitance, generally use the comparative method, that is: to find a similar capacity of capacitors, such as 10 microfarads capacitance (do not have to look for the same withstand voltage), with R × 1K gear measurements, look at the pointer swing of the largest, and then the measurement of the pump capacitance, positive and negative measurements a few times, compared to the amplitude of the two, you can judge the capacitance.
Whether the capacitance is broken, the measurement will know, it is not in our discussion.
Question 5: How to judge the general capacitance with a digital multimeter? Diode file or resistance file measurement, first short the two feet of the capacitor discharge, and then the red pen to the positive pole, the black pen to the negative pole, if there is data and this data has been increasing, and finally show 1, generally good, the fruit does not respond to change the appropriate resistance file, if it is always showing 1 is a breakdown of the open-circuit, if the value of the value of 50 or less is an internal short circuit.
Question 6: How to use the multimeter to measure the capacitance of the capacitor only capacitance and multimeter 1. If your multimeter is a digital multimeter, there is a special measurement of capacitance of the block, select the right block, the capacitance of the two feet *** measurement of capacitance of the special jacks can be directly read out the capacitance of the value to
2. If your multimeter is a pointer type multimeter, it is necessary to use the ohm gear (1k gear), with two 1k file), with two pens were connected to the two legs of the capacitor, according to the amplitude of the needle waved to estimate the capacity.
Question 7: How to use a digital multimeter to detect capacitance How to use a multimeter to detect capacitors Capacitors are one of the most commonly used electronic components. Capacitor shape and circuit symbols Color? -10 shown. Capacitor of the common symbol for "C". Capacitors are mainly composed of metal electrodes, dielectric layer and electrode leads, the two electrodes are insulated from each other. Therefore, it has the basic performance of the "isolated flow AC".
Using a digital multimeter to detect capacitors, can be carried out in the following ways.
First, the direct detection of capacitance file Some digital multimeters have the function of measuring capacitance, the range is divided into 2000p, 20n, 200n, 2μ and 20μ five files. Measurement can be discharged capacitance two pins directly into the table on the Cx jack, select the appropriate range can be read after the display data. 2000p file, suitable for measuring capacitance less than 2000pF; 20n file, suitable for measuring capacitance between 2000pF and 20nF; 200n file, suitable for measuring capacitance between 20nF and 200nF; 2μ file, suitable for measuring capacitance between 200nF and 2μF; 20μ file, suitable for measuring capacitance between 2μF and 20μF. Experience has proved that some models of digital multimeter (such as DT890B +) in the measurement of 50pF below the small capacitance capacitor error is large, the measurement of capacitance below 20pF almost no reference value. At this time, you can use the series connection method to measure the small value capacitance. Method is: first find a 220pF or so of capacitance, with a digital multimeter to measure the actual capacity of C1, and then to be measured in parallel with the small capacitance to be measured out of its total capacity of C2, then the difference between the two (C1 - C2) that is to be measured the capacity of the small capacitor. With this method to measure 1 ~ 20pF of small capacitance is very accurate. Second, the resistance file detection has proved that the use of digital multimeter can also observe the charging process of the capacitor, which is actually a discrete digital quantity to reflect the changes in the charging voltage. Set the digital multimeter measurement rate of n times / second, then in the observation of the capacitor charging process, every second to see n independent of each other and the sequential increase in the number of readings. According to this display feature of the digital multimeter, you can test the capacitor and estimate the size of the capacitance. The following is the use of digital multimeter resistance file detection of capacitors, for not set the capacitance file of the instrument is very practical. This method is applicable to the measurement of 0.1μF ~ several thousand microfarads of large-capacity capacitors. Measurement method As shown in Figure 5-11 (a), the digital multimeter will be dialed to the appropriate resistance file, the red pen and black pen were in contact with the measured capacitor Cx poles, then the display value will start from "000" gradually increased until the display overflow symbol "1 ". If always show "000", the capacitor internal short circuit; if always show overflow, the capacitor may be internal open circuit between the poles, but also may be selected when the resistance file is not appropriate. Check electrolytic capacitors need to pay attention to, the red pen (positively charged) connected to the positive terminal of the capacitor, the black pen connected to the negative terminal of the capacitor.
2. Measurement principle The principle of measurement of capacitors with resistance gear measurement shown in Figure 5-11 (b). Measurement, the positive power supply through the standard resistor R0 to the measured capacitor Cx charging, just started charging the moment, because Vc = 0, so the display "000". With the gradual increase in Vc, the display value increases. When Vc = 2VR, the meter starts to display the overflow symbol "1". Charge time t for the display value from "000" to overflow time required, the interval can be measured by quartz meter.
3. Using the DT830 type digital multimeter to estimate the measured data of the capacitance Using the DT830 type digital multimeter to estimate the capacitance of 0.1 μF ~ thousands of microfarads of capacitors, in accordance with the Table 5-1 selection of the resistance file, the table gives a range of capacitance can be measured and the corresponding charging time. The data listed in the table for other models of digital multimeter also has reference value. The principle of selecting the range of resistance is: when the capacity is small, it is appropriate to choose a high resistance range, and when the capacity is large, it should be used to select a low resistance range. If the high resistance gear estimate large-capacity capacitors, due to the charging process is very slow, the measurement time will last a long time; if the low resistance gear to check the small-capacity capacitors, due to the charging time is very short, the meter will always show the overflow, can not see the process of change.
Third, with the voltage file detection with a digital multimeter DC voltage file to detect the capacitor, in fact, is an indirect measurement method, this method can be measured 220pF ~ 1μF of small-capacity capacitors, and can accurately measure the size of the leakage current of the capacitor. Measurement methods and principles Measurement circuit shown in Figure 5-12, E for the external 1.5V dry cell. Will count ...... >>
Question 8: How to use a multimeter to measure the parameters of large-capacity capacitors Abstract: Electronic enthusiasts in the process of electronic equipment repair and electronic circuit production, often to measure the relevant parameters of large-capacity capacitors, especially large-capacity capacitor capacity, ultimate withstand voltage and leakage current. In amateur conditions, generally no capacitance meter, digital multimeter to measure the upper limit of capacitance is a few hundred uF, for thousands or even tens of thousands of uF capacitance measurement is somewhat powerless. So, in the amateur conditions, using the existing tools at hand, there is a set of simple and easy, and more accurate measurement of large capacitance of the method?
Question 9: How to use a multimeter to measure capacitance positive and negative capacitance only electrolytic capacitors are positive and negative poles, capacitors have polarity marking, such as the negative pin short, negative side of the white line and so on. Do not know the polarity of the electrolytic capacitors can be used to measure the polarity of the multimeter resistance block. We know that only the positive electrolytic capacitor connected to the power supply positive (black pen at the resistor), the negative end connected to the power supply negative (red pen at the resistor), the leakage current of the electrolytic capacitor is small (leakage resistance is large). Conversely, the leakage current of the electrolytic capacitor increases (leakage resistance decreases). Measurement, the first assumption of a pole " + " pole tui let it with the black pen of the multimeter connected to the other electrode and the red pen of the multimeter, note down the scale of the meter needle stops (the meter needle to the left of the resistance is large), and then discharged the capacitor (both the two leads touching), the two pens to the right, to re-take the measurements. In the two measurements, the last position of the meter needle stayed to the left (resistance value) of that time, the black pen is connected to the positive electrolytic capacitor. When measuring, it is better to use R*100 or R*1K stop.