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4 Product
4.2 Description
The ALMEMO
®
AC measuring modules ZED7 30-ABx, ZED7 31-ABy, and
ZED7 37-ABxy measure the true root mean square (RMS) value of an AC current
signal and / or an AC voltage signal. This means that the measuring signal with
any arbitrary shape of curve is digitized at 1kHz and the true RMS value is
calculated and displayed on the measuring device.
Measuring modules of the ZED7 37-ABxy types measure the AC current as well as
the voltage synchronously and on the basis of these values, the active power and
the power factor are determined. The data transmission to the measuring device is
done digitally.
The measuring module is galvanically isolated at 6 kV and protected from
overvoltage. The measuring module can be connected to every measuring input of
any ALMEMO
®
measuring device of the device generation V7. It is also possible to
connect several measuring modules to one measuring device.
The power supply of the measuring module is provided by the ALMEMO
®
measuring device via a DC/DC converter (isolation voltage 6 kV). The power
supply of the measuring device is stressed by approx. 40 mA, i.e. for a long-term
operation a mains adapter is required.
True RMS value measurement
The alternating voltage signal is permanently sampled at 1kHz and the total RMS
value of DC and AC voltage components is being calculated.
V
=
eff
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