adc-44d ETC-unknow, adc-44d Datasheet - Page 22

• Manufacturer Part Number: adc-44d
• Description: Multi-function Analogue Input/output Card
• Manufacturer: ETC-unknow

Page 14
Analogue Inputs
The ADC-44d analogue input circuitry can be software configured to operate
with single ended or differential signals.
A single ended input measures the absolute voltage applied to the input channel
(e.g. Vin3) with reference to the signal ground connection or 0 Volts (Vin 0v).
This is the simplest connection type and suitable in all but the noisiest
environments.
With this input configuration the maximum voltage range that the card can
measure is 10 Volts.
A differential input measures the difference between two input terminals. This
configuration provides good noise rejection if measurements are to be made in
an electrically noisy environment. When the card is configured in this mode the
maximum voltage range on each of the input pairs is 10 Volts, subject to a
maximum of 10 Volts on any input pin. That is, no pin may exceed 10 Volts
with respect to the analogue 0 Volts.
Each channel in the range 0 to 7 has a corresponding channel in the range 8 to
15. Differential inputs are applied to the corresponding pairs,
e.g. between +Vin0 and -Vin0, or between +Vin1 and -Vin1, etc. Note that
+Vin0 in differential mode is +Vin8 in single ended mode.
Note: Voltages in excess of ± 15V on the input terminals may cause the
input devices to become damaged. DO NOT apply voltages greater than this
level.
I/O Connections
Chapter 4