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This project
describes measurement instrumentation, designed for Voltage and
Current measurement in the industrial low power range (approx.
up to 3KW equipment). It has been designed to control the operation
of stabilized power supply or battery-charger. It has a set of
analog and digital inputs, and it is able to measure true-rms
value of 1 AC voltage source (obtained generally from a Voltage
Transformer), 1 AC current source (obtained from a 50Hz T.A.),
3 DC-current floating photo-coupled sources (1 allowing positive
and negative measurement), 3 DC-Voltage common negative sources,
2 temperatures in 0-150° C range. The meter can also monitor
4 digital inputs for alarms and/or status signalling. In "editor
mode", the software permits using only 3 keys, to associate
a 10-char string name to every inputs, e.g. the Vac input could
be "Line Volt.", a Temp. Input could be "Cooling
T." etc. A 4-row presentation string is fully programmable
too, including the possibility to declare a Vdc input as a battery
input, for monitoring charge status.
Block
Diagram
Giuliano
Corticelli
Padova, Italy
gcorticelli@libero.it
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