How does a multimeter measure batteries
1. Use a multimeter to test the gear with the DC gear greater than the rated voltage of the battery. For example: test dry battery 9V, 1.5V with DC10V, DC2V file test. the
2. After selecting the gear according to the rated voltage of the battery, connect the positive and negative poles of the battery with test leads. When the test voltage is greater than or equal to the rated voltage marked on the battery. The battery is fine. When the test voltage is 10% lower than the rated voltage, the battery can be used on electrical appliances with a small discharge depth. For example: quartz clock, remote control and other electrical appliances. When the test voltage is 20% lower than the rated value, the battery has no use value. the
3. It should be reminded that the voltage of the rechargeable battery is generally 15%-25% lower than that of similar batteries. For example, the voltage of the 5# battery is 1.5V, while the rechargeable battery is generally only 1.2-1.3V. Therefore, the rated value marked on the battery should be carefully confirmed.
When using a multimeter to measure current, you must pay attention to the most important point. Do not confuse the method of measuring current with the method of measuring voltage, because many novices use the same method of measuring current and measuring voltage, and directly connect the test leads into the circuit in parallel. If the multimeter is a miscellaneous meter, the fuse is burned out, and the shunt resistor in the current block shunt must be burned out. If it is a digital meter, even the 7106 may have to hang up, but if it is a better multimeter, if you use current The voltage is measured in the event of a block error. This voltage signal will be clamped at 0.7V by the current block protection circuit and the bidirectional limiting diode to protect the current block shunt.
The method of measuring voltage is to turn the multimeter to the voltage block, then insert the red test lead into the VΩ hole, the black test lead into the COM hole, and then connect the red and black test leads into the circuit in parallel to measure the voltage. The current is just the opposite. That is to say, if you want to measure the current, Use the current gear of the multimeter and select a good range. If you don’t know the current value, you can choose a larger range to prevent the multimeter from displaying "1" over the range. Then insert the red test lead into the mA hole, or the 10A hole, and the black test lead into the COM hole. (The COM hole is called the black test lead jack at the common end) Then disconnect a part of the circuit, and string the red and black test leads into it for measurement, that is to say, if you measure the current, you must string it into the line for measurement.
