Dewetron DEWE-ORION-0824-20 Series, Technical Reference Manual

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DE-M080801E • DEWE-ORION-0824-20x • Technical Reference Manual • Printing version 1.1.2 • March 19, 2014
DEWE-ORION-0824-20x
DEWE-ORION-0824-20x
1 Introduction
1.1 Key features
8 simultaneous sampled channels
204.8 kS/s per channel
24-bit resolution
Anti-aliasing filter
High dynamic range 108 dB
4 input ranges (from ±0.1 V to ±10 V)
Voltage or ICP® mode (4 mA or 8 mA source)
Input coupling DC or AC (0.15 Hz or 3.4 Hz)
Input configuration differential or single-ended
TEDS (IEEE 1451) sensor support
ICP® sensor status indication via LED (open/short)
Two 32-bit counter/encoder with programmable trigger levels
8 synchronous digital inputs with programmable trigger levels
8 digital in- and outputs with TTL level
RS-485 interface
Options:
Two high speed CAN 2.0B controllers
8 additional counter/encoder or 32 TTL inputs (ORION-0824-202)
8 additional counter/encoder or 32 inputs adjustable trigger levels (ORION-0824-204)
1.2 How to use the manual
In Chapter one you find an overview about the card-types and possibilities of configurations.
Chapter two explains how to install the card and connect the sensors.
The ADC conversion and the counter-functions are described in chapter three.
All specifications are listed in chapter four.
1.3 Overview
The DEWE-ORION-0824-20x combines high resolution (24-bit) with high speed (204.8 kS/s per channel)
and high accuracy (typically 0.002 dB inter channel gain mismatch). All this has been arranged on a PCI
half-size board. In addition each channel has an anti-aliasing filter which is automatically set to the half of the
sample frequency. This can be reached with an internal oversampling of the ADC of up to 256 times. That
means if the sample frequency is set to 50 kHz, the ADC converts data with 12.8 MHz!
Due to the multiple board synchronisation features it is possible to install up to 8 DEWE-ORION-0824-20x
boards in one system working absolutely synchronous. Using more than 8 boards (in an external system or
connected with a PCI to PCI-Bridge to the main system) requires the usage of a SYNCH-BUS-REPEATER
(option ORION-DSA-SYNC).
This high channel count, combined with high sample rate, requires a high speed and high capacity data
storing system behind the boards. For example: 64 channels, each with 204.8 kHz sample rate and 24-bit
resolution results in nearly 50 Mbyte of data per second (24-bit data will be transferred as a 32-bit value).
To reduce this by a factor of two, a unique 16-bit data transfer mode (packed mode) is implemented. It is no
simple reduction to 16-bit resolution. The technique picks the 16 bits of interest out of the whole 24-bit analog
range for the data transfer.
Furthermore the analog input range can be set independently to 0.1 V, 0.5 V, 2 V and 10 V. A highpass filter
with 0.15 Hz or 3.4 Hz, a DC current source with 4 mA or 8 mA as well as TEDS sensor support is on board.