Can a multimeter detect the quality of the battery?

Hello, under the premise of no professional measurement period, if the owner has his own multimeter, he can only make a general health measurement of the vehicle battery, of course, this is not possible to do a very accurate measurement. Therefore, the multimeter measurement results can only be used as an approximate reference.

The method is a two-time measurement method. The specific operation method is to measure the no-load voltage of the battery with the voltage level of the pointer multimeter before the vehicle is started.

Generally, the rated voltage of the passenger car battery is 12V, and the no-load no-load voltage is usually slightly around 13V. If you find that the voltage is significantly low, it means that the health of the battery is not optimistic.

The second step, the moment the person in the car manipulates the key to try to start the vehicle, the person outside the car observes the pointer of the multimeter, if the starter works at the moment, the battery voltage is lower than 10V, which basically means that the battery life will not be too long. This is because the instantaneous high current voltage drop of the battery is large, which reflects that the battery cannot withstand the output of the violent high current.

The multimeter cannot detect the quality of the battery. To detect the quality of the battery, you need to use the battery tester discharge test.

No, only the voltage can be measured.

If it is a lead-acid battery, the voltage measured after parking is generally about that, if it is this voltage, it is normal, no matter what, after a period of time, the voltage must be higher than 12V, otherwise it is necessary to consider replacing the battery.

Prepare the multimeter and the battery to be tested, press the power button, turn on the multimeter, click the voltage test gear, connect the positive pole of the battery for the red test, and connect the negative pole of the battery for the black test line.

Observe the display value of the multimeter, if it is between it, it means that there is no problem with the battery, and if the voltage is sufficient, it means that there is no problem with the battery, but the power is insufficient. If the voltage is below, there is a problem with the battery or there is a serious lack of power.

Battery precautions.

If the battery is not used for a long time, it will slowly discharge itself until it is scrapped. Therefore, the car should be started every once in a while to recharge the battery. Another way is to pull off the two electrodes on the battery, it should be noted that the positive and negative electrode wires are unplugged from the electrode column, the negative electrode wire should be unplugged first, or the connection between the negative electrode and the automobile chassis should be removed, and then the other end with the positive electrode mark (ten) should be removed.

The battery has a certain service life and needs to be replaced after a certain period. The same sequence should be followed when replacing the electrode wires, but when connecting the electrode wires, the order is reversed, first the positive electrode and then the negative electrode.

It is impossible to measure the quality of the battery with a multimeter, and the multimeter can only simply measure the voltage of the battery.

To know the quality of the battery, you need to use a battery detector, which can detect CCA, battery voltage, battery internal resistance, battery service life, etc.

Answer 1, disconnect the battery, measure the voltage of the battery, if the battery voltage is significantly lower than the nominal voltage, please charge it with the charger first; 2. If the no-load battery voltage is normal, plus the load, you can open the electric vehicle door, put the rear wheel overhead, add a certain resistance to the rear wheel, and screw the accelerator switch; 3. At this time, measure the battery voltage, if you find that the battery voltage drops, but the drop is not much, and the vehicle accelerates strongly, it means that the battery is basically intact; 4. If the battery voltage drops very much at this time, which is seriously lower than the nominal lower limit voltage, and the vehicle accelerates weakly, it means that the battery has aged and the capacity is insufficient. The above methods can only be roughly judged, and accurate judgment needs to be measured with a battery capacity meter.

Hope it helps.

It is not possible to measure the quality of the battery with a multimeter, but the quality of the battery can be judged from the measured voltage and current, and the voltage of the battery can be charged to a certain time, and after it is fully charged, the voltage will not drop when there is no load, and the battery can be basically determined to be good. You can also connect the current file of the multimeter in series on the battery to charge, observe the current change, if there is no charging current, the charging current is very small, indicating that there is a problem with the battery.

The no-load voltage of the battery can only be measured with a multimeter, and it cannot explain the quality of the battery. You must use a battery tester.

Hello, the easiest way is to measure the voltage.

How to judge the quality of the battery? Can you measure it with a multimeter, the mechanic will tell you.

1. First of all, select an appropriate load resistor, and then connect the load resistor in parallel between the positive and negative poles of the battery. As shown below:

There is a known relationship between the battery voltage and the remaining power, so according to the capacity and purpose of the battery, the voltage at both ends of the resistance can be measured to see how much the battery voltage drops when the battery is under load compared with the no-load voltage, and the battery power can be judged.

However, the premise is that no load is applied, because after the load is applied, the battery voltage will be distorted due to the voltage drop caused by the internal impedance, and it will gradually decrease at different rates over time, and gradually increase after the load is removed. Therefore, if a load is applied, it will affect the detection result of the dry battery level.

2. The multimeter can also accurately measure the voltage of the dry battery. The amount of power can be judged by measuring the voltage of the dry cell battery. Dry batteries are alkaline and carbon.

If the measured voltage is not less than the marked voltage of the dry battery, it means that the power of the dry battery is sufficient; The more the labeled voltage less than the dry battery, the more power the dry battery loses.

Due to the different models, the test results of the dry battery may be affected, but for a single dry battery, as long as the ordinary pointer universal meter is used, the universal meter is selected as the maximum current gear (, the negative meter pen is connected to the negative pole of the battery, and the positive meter pen should be quickly touched on the positive pole of the battery, at this time, pay attention to the movement of the watch hand (short-circuit current) to know how much power is left in the battery.

If there are two identical batteries at home, the voltage at the open circuit end can be measured, and the battery power can be detected by measuring the internal resistance of the battery. First, measure the open circuit voltage of the battery, and then connect a load (such as a small lamp bead) to the battery, the voltage of the battery will drop, and measure the voltage. The difference between the open-circuit voltage and the load voltage divided by the current operating under load can roughly calculate the internal resistance of the battery, and the larger the internal resistance, the smaller the battery.

Note: Under normal circumstances, it is difficult to measure the battery voltage correctly with a multimeter, unless the battery voltage is zero.

If the voltage after full charge is, it means that it is okay, if the battery time reaches more than the time of the new battery, it means that the battery is not bad, if the voltage after full charge is higher, it means that there is a problem with the charger.

First discharge the capacitor, which is the premise of testing the capacitance, and then select the grade of the multimeter according to the size of the capacitor, if you use a digital multimeter to test the capacitance of the micromethod, choose a grade larger than the micromethod, and then insert the 2 wires of the capacitor into the 2 jacks of the test capacitor in the table, pay attention to good contact.

According to the size of the measured capacitance, select the R gear of the analog multimeter, the larger the capacitance, the smaller the R gear, and vice versa. Then measure the response of charging and discharging, and judge the size of the capacitance according to the amplitude of the pointer swing. If the pointer can return to infinity, it means that the capacitance does not leak, and if it cannot return to infinity, it means that the capacitor leaks.

If the leakage is large, it cannot be used.

The multimeter is best in 5V or 10V gear, because it is more demanding, the closer the measured gear is, the higher the accuracy of the measured value, the rated voltage of the mobile phone battery is DC 4V, if the measured value is around the right, it means that the battery is normal, because the manufacturer is based on this voltage as the standard to produce the output voltage of the mobile phone battery charger when no-load is DC 4V. Household ordinary batteries 1, 2, 5, and 7 are all voltages, and the value measured by the new battery at no load is normal after load.

1. Detection of fixed capacitors. Detects small capacitances of 10pF or less.

Because the capacitance of fixed capacitors below 10pf is too small, it can only be qualitatively checked for leakage, internal short circuit or breakdown by measuring with a multimeter. When measuring, you can choose to use a multimeter R 10K gear and use two meter pens.

Connect the two pins of the capacitor at any point, and the resistance value should be infinity. If the measured resistance (the needle swings to the right) is zero, it means that the capacitor is damaged by leakage or internal breakdown.

Detect whether the 10pf fixed capacitor is charged, and then judge whether it is good or bad. The multimeter uses R 1K gear. Both transistors have a value of 100 or more, and the penetration current should be small.

3DG6 and other types of silicon transistors can be selected to form composite tubes. The red and black pencils of the multimeter are connected to the emitter E and collector C of the composite tube, respectively. Due to the amplification effect of the composite transistor, the charging and discharging process of the measured capacitor is amplified, so that the swing amplitude of the multimeter pointer is increased, so as to facilitate observation.

It should be noted that during the test operation, especially when measuring the capacitance of a smaller capacitance, it is necessary to repeatedly switch the pins of the capacitor under test to contact the two points A and B, so that the swing of the multimeter pointer can be clearly seen. For the above fixed capacitors, the R 10K stop of the multimeter can be used to directly test whether the capacitor has a charging process and whether there is an internal short circuit or leakage, and the capacitor capacity can be estimated according to the amplitude of the pointer swinging to the right.

How to use a multimeter to detect the power supply of a power tool, how to detect the quality of the battery, the tips are here.

If the no-load voltage of the battery is normal, add the rated load to both ends of the battery, and measure the voltage at the end of the battery with a multimeter to see if it drops very low and quickly, if so, you can judge the quality of the battery.

1. Multimeter, also known as Bizhao multiplexing meter, multi-purpose meter, regret leakage three-purpose meter, multi-purpose meter, etc., is the most basic tool in the field of electronic testing, and is also a widely used testing instrument. It is composed of three main parts: the meter, the measuring circuit and the transfer switch. Generally, the main purpose is to measure voltage, current, and resistance.

2. According to the display mode, it is divided into pointer multimeter and digital multimeter. It is a multi-functional, multi-range measuring instrument, generally the multimeter can measure DC current, DC voltage, AC current, AC voltage, resistance and audio level, and some can also measure AC current, capacitance, inductance and some parameters of semiconductors. The basic principle is to use a sensitive magnetoelectric DC ammeter (microampere meter) as the meter head.

When a small current passes through the meter head, the multimeter will have a current indication.

3. The multimeter can not only be used to measure the resistance of the measured object, but also the AC and DC voltage. There are even multimeters that measure the main parameters of transistors and the capacitance of capacitors. Being proficient in the use of a multimeter is one of the most basic skills in electronic technology.

OK. The multimeter measures the quality of the battery, but it should be noted that it is best to have a discharge device to add the battery to the load in order to accurately measure. First of all, dial the multimeter to the DC 20 volt gear (electronic multimeter), you can use a resistance of 2 ohms, the resistance power is 100 watts, and connect to both ends of a single battery, the normal voltage of the measuring battery should be 12V, below this voltage indicates that the battery storage capacity is insufficient.

If there is no discharge resistor, you can consume the power of the electric vehicle, and measure the voltage of each battery, and if it is too low, it is a problematic battery.

Structure of the multimeter:

The multimeter consists of three main parts: the meter, the measuring circuit and the transfer switch.

1) Meter header (pointer type).

It is a highly sensitive magnetoelectric DC ammeter, and the main performance index of the multimeter basically depends on the performance of the meter head. The sensitivity of the meter head refers to the value of the DC current flowing through the meter head when the meter head pointer is deflected at full scale, and the smaller this value, the higher the sensitivity of the meter head. The greater the internal resistance when measuring the voltage, the better its performance.

There are four tick marks on the gauge head, and their functions are as follows: the first one (from top to bottom) is marked with R or , which indicates the resistance value, and when the transfer switch is in the ohm stop, it reads this tick finger rubber line. The second strip is marked with and VA, indicating the value of AC and DC voltage and DC current, when the transfer switch is in the AC, DC voltage or DC current block, and the range is in other positions other than AC 10V, this tick mark is read.

The third is marked with 10V, indicating the AC voltage value of 10V, when the transfer switch is in the AC and DC voltage block, and the range is in the AC 10V, that is, this scale is read and the line is missing. The fourth bar is marked with DB, which indicates the audio level.

2) Meter header (digital).

The meter head of the digital multimeter is generally composed of a A D (analog digital) conversion chip + peripheral components + liquid crystal display, the accuracy of the multimeter is affected by the meter head, the multimeter is also known as 3 1 2 digit multimeter due to the number converted by a D chip, 4 1 2 digit digital multimeter and so on. The most commonly used chips are ICL7106 (3-and-a-half position LCD manual range classic, subsequent versions 7106A, 7106B, 7206, 7240, etc.), ICL7129 (4-bit half-bit LCD manual range classic), ICL7107 (3-position half-bit LED manual range classic).

2) Measure the line.

A measurement line is a circuit that converts various measurements into a tiny DC current suitable for meter measurement, and consists of resistors, semiconductor elements, and batteries.

It can unify a variety of different measured (such as current, voltage, resistance, etc.) and different ranges into a certain amount of small DC current into a certain limit after a series of processing (such as rectification, shunt, voltage division, etc.) and send it to the meter head for measurement.

3) Transfer switch.

Its function is to select a variety of different measurement lines to meet the measurement requirements of the same type and different ranges. A transfer switch is generally a circular dial with function and range marked around it.