Drehspulinstrument und Weicheiseninstrument

Study Notes

Drehspulinstrument

These instruments utilize a coil (rotor) that rotates within a magnetic field.
The rotation is proportional to the current flowing through the coil.
A pointer attached to the coil indicates the current reading on a calibrated scale.
They are generally more accurate and sensitive than other moving-coil instruments.
They can measure both direct and alternating current (AC) with appropriate modifications.
Common use cases include measuring small currents and voltages in various electrical circuits.
They often require a sensitive suspension mechanism to minimize friction and allow for accurate rotation.
Their operation relies on the interaction between the current-carrying coil and the magnetic field; this creates a torque that causes the coil to rotate.

Weicheiseninstrument

These instruments rely on the magnetic properties of iron or other ferromagnetic materials.
In operation, a current-carrying coil creates a magnetic field that attracts or repels a soft iron core.
The movement of the iron core causes a pointer to deflect on a calibrated scale.
These types of instruments are typically robust and reliable but less sensitive than moving-coil instruments.
They are appropriate for measuring larger currents.
They are relatively simple in construction.
The magnetic field strength is directly proportional to the current.
The deflection of the pointer is directly proportional to the square of the current.
Applications often include measuring currents and voltages in household appliances and industrial equipment.

Hitze-Draht Temperaturmeter

These instruments use the principle that the resistance of a heated wire changes proportionally to temperature.
A fine wire, usually of platinum or tungsten, is heated by the current passing through it.
The changing resistance is measured and related to the temperature via a calibrated scale.
Accuracy depends on the material used and the calibration.
Commonly used to measure temperatures in specific ranges.
The wire's heating is directly proportional to the square of the current.
The material of the wire is selected for its predictable resistance-temperature relationship.
These types of instruments often find use in industrial settings for measuring and monitoring processes.
A change in temperature results in a change in resistance, which in turn affects the current flow, causing a deflection of the galvanometer pointer.

Description

Erforsche die Funktionsweise von Drehspulinstrumenten und Weicheiseninstrumenten. Diese Quiz behandelt ihre Betriebsprinzipien, Anwendung und Messgenauigkeit in elektrischen Schaltungen. Teste dein Wissen über die Unterschiede und Gemeinsamkeiten dieser beiden Instrumententypen.