Hardware Manual COMBILOG 1020
35
4.4 Internal
Processing
Next to collecting the analog input signals, the analog multiplexer
at the input of the circuit collects the internal reference voltage.
All these values are then transmitted to the programmable ampli-
fier PGA, where the signals are amplified according to the kind
and type of the connected sensors and then supplied to the A/D
converter.
The A/D converter digitalises all incoming signals with a definition
of 16 bit and at a rate that can be preset for the module by the
user. The Sigma-Delta-procedure used for the A/D-convertion
guarantees a high accuracy and a high linearization. The A/D-
converter processes an integrated amplifier with the amplifier
stages of 1, 2, 4, 8, 16, 32 and 64. For very small signals, the
module switches to an additional amplifier with amplifier stages of
100, 200, 400, 800 and 3200. The amplification in alignment with
the accuracy and resolution of the calculated measuring values
results from the selection of the measuring range which will be
configured by assistance of the configuration software.
This software also enables use of a low pass filter, depending on
the mains frequency (selectable between 10 and 400 Hz).
The microprocessor µP now edits the measuring signal in digital
form. First the processor linearises and scales the signal and
holds it ready for transmission via bus in programmable units.
Further the processor monitors the measured values for excess
of freely programmable threshold values. Thus a monitoring of
failure or breaking of the sensing element or short-circuit can also
be realised. The datalogger can be activated - by means of ap-
propriate configuration - to provide a corresponding signal at the
digital I/O in case of alarm. The digital I/Os are directly addressed
and monitored respectively by the microprocessor µP.
Summary of Contents for COMBILOG 1020
Page 1: ...COMBILOG 1020 Datalogger Hardware Manual Version 3 09...
Page 2: ...Hardware Manual COMBILOG 1020 2 Issue 03 11 2005 Technical data are subject to change...
Page 4: ...Hardware Manual COMBILOG 1020 4...
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Page 86: ...Hardware Manual COMBILOG 1020 86 Bild 8 1 Example Master Slave System...
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