FI series dc to ac inverter 12v 24v
The ammeter is made according to the action of the current-carrying conductor in the magnetic field by the force of the magnetic field. There is a permanent magnet inside the ammeter, which generates a magnetic field between the poles. There is a coil in the magnetic field. There is a hairspring spring at each end of the coil. Each spring is connected to a terminal of the ammeter. A rotating shaft is connected between the spring and the coil. On the front of the ammeter, there is a pointer. Pointer deflection. Since the magnitude of the magnetic field force increases with the increase of the current, the magnitude of the current can be observed through the deflection of the pointer.
Generally, currents of the order of microamps or milliamps can be directly measured. In order to measure larger currents, the ammeter should have a parallel resistor (also known as a shunt). The measurement mechanism of the magnetoelectric meter is mainly used. When the resistance value of the shunt is to make the full-scale current pass, the ammeter is fully deflected, that is, the indication of the ammeter reaches the maximum.
Notes on the ammeter:
⒈ Correct wiring. When measuring current, the ammeter should be connected in series with the circuit under test; when measuring voltage, the voltmeter should be connected in parallel with the circuit under test. When measuring DC current and voltage, you must pay attention to the polarity of the meter, and the polarity of the meter should be consistent with the polarity to be measured.
⒉ Measurement of high voltage and high current. When measuring high voltage or high current, a voltage transformer or a current transformer must be used. The ranges of the voltmeter and ammeter should be consistent with the secondary rated value of the transformer. The general voltage is 100V and the current is 5A.
⒊ The expansion of the range. When the measured value in the circuit exceeds the range of the instrument, an external shunt or voltage divider can be used, but it should be noted that its accuracy level should be consistent with the accuracy level of the instrument.
⒋ In addition, it should also be noted that the operating environment of the instrument must meet the requirements and be far away from external magnetic fields.
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