Input Connections
Page 9
Blue Chip Technology Ltd.
01271014.doc
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Input Mode
When all the signals to be measured have a common connection to ground
which is suitable for connection to the computer zero volts, then the ADC
module may be used in the single ended mode to provide 16 signal inputs with
the common connection going to digital ground. When the signals to be
measured are not referenced ground it will be necessary to use the differential
input mode.
In this mode the input signals are subtracted by the circuitry on the board so
that the difference or differential signal is measured.
In this mode inputs are used in pairs so that for differential input 0, the positive
connection is made to pin2 (input 8) and the negative connection to pin 1 (input
0) and so on in pairs. In the differential mode only 8 input signal (pairs) can be
accommodated.
Signal ended or differential mode is selected by two links marked LKJ and LKH
on the ADC card.
The following link positions should be used to select the required mode.
For Differential Mode
LKH
S
D
S
D