Calibration
Primary Training
2 GENERAL
FUNCTIONS
The acquisition card can process 8 analog channels and 24 digital channels. It can
handle 2 different acquisition rates. Each analog channel is programmed for one of
those 2 rates. A yellow LED at the front edge of the card blinks twice per second
during normal operation mode.
The main functions of the 623 card are as follows:
2.1 Operating mode :
2.1.1 12 bit-analog/digital conversion of analog channels
The 623 card contains two 12 bit-analog/digital converters with 4 inputs fitted with
an independent and synchronous sample-and-hold per channel.
2.1.2 Anti-aliasing filter
The anti-aliasing filter (6th order BUTTERWORTH low-pass filter) attenuates the
components of the signal whose the frequency exceeds 0.35 times the sampling
frequency.
2.1.3 Switchable RMS/DC conversion of the analog inputs (-02, -12, -22
option)
An optional RMS/DC converter can be mounted on each channel, and is used for
measurements of AC signals at a low recording speed. It can be switched ON or OFF
for each channel independently, through the BENCFG software.
2.1.4 Transmission of the results to the processing unit by high speed serial
line.
The results of the conversion of the 8 analog channels and the status of the 24 digital
channels are sent to the processing unit through a synchronous line at 3 Mbits per
second.
The same transmission line is also used by the CPU for initializing and controlling
the correct operation of the card, at the connection time and each time that it switches
from the IDLE to the RUN mode.
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