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Old August 26th, 2008, 09:08 AM
pascal pascal is offline
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Talking Maximum unbalanced capacitance of FDU devices

IEC6158-2 y FF-816

There is a note in the FF standard that says:

"The maximum unbalanced capacitance to ground from either input terminal of a device shall not exceed 250pF"

Is it supposed to be measured with the segment powered on or off ?

The question comes because the capacitance measurment of the FF segment is done with the segment powered off (offline), but what did it happen when I want to measure it in every FDU ?

(FDU: Fieldbus distribution unit)


We have measured it in both cases and the values change how expected.
1 24VDC connected to the Trunk > Spur Capacitance measurement A
1 24VDC disconnected from the Trunk > Spur Capacitance measurement B

The best answer wins a nice tour in Santiago Chile & Los Andes (Tickets not included)

Tnx

Pascal
 

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