Description Of The Measuring Module - Ahlborn ALMEMO ZAD 900-AB Series Instruction Manual

4.2 Description of the Measuring Module

The ALMEMO ® DC measuring modules ZAD 900-ABx and ZAD 901-ABx record
the momentary value, the maximum value, the minimum value and the average
value of an DC current or an DC voltage signal. Every time the monitoring station
is queried, the values will be transferred to the ALMEMO
The ALMEMO ® AC measuring modules ZAD 903-ABx and ZAD 904-ABx record
the true RMS value of an AC current and/or an AC voltage signal. This means that
the measuring signal with curves of any shape will be digitalized at 1kHz and the
true RMS value will be calculated and then be displayed on the measuring device.
The measuring module provides 6kV galvanic isolation and overvoltage protection.
The measuring module can be connected to any arbitrary ALMEMO
device. It is also possible to connect several measuring modules to one measuring
device.
The power for the measuring module is supplied by the ALMEMO
device via a DCDC converter (insulation voltage 6 kV). The current supply of the
measuring module is loaded with 50 mA, which means that for long-term
operations, a mains adaptor is required.
True RMS value measurement
The AC voltage signal is continuously sampled at 1kHz and the overall RMS value
is calculated from the DC and AC voltage components.
V =
rms
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