Why does the multimeter needle turn in the opposite direction when measuring DC electricity?
1. Functions of analog multimeter
In fact, the analog multimeter, like other multi-function meters, can measure DC current, DC voltage, AC current, AC voltage, resistance and other data.
2. How to measure direct current
The meter head of an analog multimeter is actually a DC ammeter meter. When it is necessary to measure DC current, each gear is equivalent to connecting a resistor with a different resistance in parallel to the meter head to shunt the current. When measuring DC voltage, a resistor of different resistance is connected in series to the meter head to reduce the voltage.
How to use a multimeter to measure
Using a multimeter can be divided into several steps:
1. Observation and mechanical zero adjustment are required before use, that is, 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 at DCmA. The DC gear must be selected here because DC is direct current and AC is alternating current. The specific gear needs to be estimated based on actual measurement data. value.
3. The red test lead should be inserted into the "+" position, and the black test lead should be inserted into the "com" port. When measuring, the red test lead should be at the positive pole of the device under test, and the black test lead should be at the negative pole of the device under test (here is the focus of this question) )
Because the characteristic of direct current is that its direction does not change with time, it has a direction. You must pay attention to the direction when measuring. When measured as shown above, the reverse value will be displayed.
