Apa is the reason why the needle of the multimeter measures the DC current in the opposite direction?
Ada terutamanya digital dan pointer multimeters. Since you are using a pointer type, you can use a pointer multimeter to explain it.
1. Function of pointer multimeter
In fact, the pointer multimeter is the same as other multi-function meters, which can measure DC current, DC voltage, AC current, AC voltage, resistance and other data.
2. How to realize the measurement of direct current
The head of the pointer multimeter is actually a head of a DC ammeter. When it is necessary to measure the DC current, each gear is equivalent to connecting a resistor with a different resistance in parallel with the head, so as to divide the current. When measuring DC voltage, a resistor of different resistance is connected in series with the meter head to reduce the voltage.
Using a multimeter can be divided into several steps:
1. Pemerhatian dan mekanikal sifar pelarasan are required before use, that is, to ensure that the pointer is on the zero scale before use.
2. Select the correct gear according to the measured data. For example, when measuring DC current, the gear is selected as DCmA. Here, the DC gear must be selected, because DC is direct current and AC is alternating current. The specific gear needs to be estimated according to the actual measurement data.
3. The red test lead should be inserted in the "+" position, and the black test lead should be inserted in the "com" port. When measuring, the red test lead should be the positive pole of the device under test, and the black test lead should at the negative pole of the device under test (here is the focus of this question)
