Use a multimeter to measure the DC needle rotation in the opposite direction to that of the cause.
1. Functions of Pointer Multimeter
Pointer multimeter can actually measure DC current, DC voltage, AC current, AC voltage, resistance and many other data just like other multifunction meters.
2. How to achieve the measurement of DC
The head of the pointer multimeter is actually a DC ammeter head, when you need to measure DC current, each gear is equivalent to the head in parallel with a different value of the resistance, so as to shunt. When measuring DC voltage, it is connected in series with a different resistance resistor in the meter head, so as to reduce the voltage.
Using a multimeter can be divided into several steps:
1. Before use, you need to observe and mechanically adjust the zero, that is, to ensure that the pointer is on the zero scale before use.
2. According to the measured data to choose the correct gear, such as measuring DC current, gear selected in DCmA, here must choose DC gear, because DC is DC, AC is AC, the specific gear needs to be valued according to the actual measurement data.
3. red pen should be inserted in the "+" position, the black pen inserted in the "com" port, in the measurement of the red pen should be in the positive pole of the device being measured, the black pen should be in the negative pole of the device being measured (here is the focus of the problem)
Because the characteristic of DC is that the direction does not change with time, so it has a direction, and you must pay attention to the direction when measuring. If you measure like this as shown above, it will show the reverse value.
