When the ambient temperature changes, the magnetoelectric instrument will produce additional errors, which are manifested in the following three aspects:
(1) After the temperature rises, the elasticity of the hairspring or the wire is weakened, resulting in a decrease in the reaction torque and a tendency to deflect the pointer of the instrument.
(2) After the temperature rises, the magnetism of the permanent magnet is weakened, which reduces the magnetic induction intensity in the magnetic gap of the instrument, which makes the deflection of the instrument pointer slow.
(3) When the temperature rises, the wire resistance value changes.
When the instrument is manufactured, the compensation methods usually used are:
(1) Magnetic compensation method. In the magnetic system, a magnetic shunt (nickel-copper alloy or iron-nickel alloy) of a special material is used. When the temperature rises, the shunting effect is weakened; when the temperature is lowered, the shunting effect is strengthened. Most of the magnetic shunts are installed at the opening of the pole of the magnet, and some can also be adjusted to the left and right to change the temperature of the magnetic shunt. Compensation effect.
(2) Adjust the tension of the hairspring or the wire with a bimetal. When the temperature changes, the tension of the wire also changes, thus achieving the effect of temperature compensation.
(3) The thermistor is connected to the line and used in combination with the manganese-copper resistor to achieve temperature compensation.
(4) Using different wiring methods to form the measuring circuit to compensate for the influence of the dynamic resistance change. For example, the method of making the temperature coefficient of the shunt resistor branch of the moving coil branch equal; and the method of connecting the manganese steel resistance with the moving coil; Use series or parallel compensation circuit and so on.
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