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Moving-iron panel meter

Voltmeter with phase selector switch


Moving-iron measuring instruments are mainly used in heavy-current installation for the measurement of alternating currents and alternating voltages (direct measurement). Moving-iron measuring instruments also indicate the rms value in case of non-sinusoidal quantities within a frequency range of 50/60 Hz.
With direct current and direct voltage, additional indication errors of approx. 1 % may occur due to magnetization errors inside the iron. As compared to moving-coil measuring instruments, the energy consumption is relatively high ranging between 0.6 VA and 2 VA. They are thus not suited for measuring small currents or voltages.

Function / Design
The moving iron movements are robust with spring-loaded bearings.
The moving iron measuring devices are manufactured in accordance with DIN EN 60051 and the other applicable VDE and DIN regulations. The accuracy is 1.5% (size 48 accuracy 2.5%), based on the full scale value and starts at approx. 10% (with voltmeters at approx. 20%) of the full scale value. The devices can be permanently overloaded by a factor of 1.2; Ammeters can be overloaded up to 50 times for a short time; Tension meter up to 2x. For the rest, DIN EN 60051 applies.

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