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Configuration
Configuration through Software
DaqBoard/500 Series boards have no hardware jumpers or switches. All data-acquisition settings such
as analog input, data collection rates, input voltage range, and operating modes are configured through
application software. A DaqView software driver provides an application level software interface to
Windows NT, 2000, and XP. Software packages such as LabVIEW can also be used. These packages
configure and collect, or output, acquisition data in a GUI based interface.
Analog Input Configuration
The analog inputs are impedance buffered and drive a differential gain amplifier that can be referenced in a
number of ways allowing for Single-Ended or Differential programmable input configurations.
A "1 to 176" element channel configuration RAM is provided to allow each ADC channel to be set with a
different Gain, Range, Thermocouple Type and Input Configuration selection combination.
ADC Ranges
The analog inputs may be configured for either ±10 V bipolar or 0 to10 V unipolar operation. The input
range is programmable on a channel by channel basis in a 176-element channel configuration RAM. Note
that the range selection also applies to expansion channels.
The programmable gain circuitry must also be taken into account in defining the usable error free input
range. The boards provide a wide range of programmable ranges and resolutions. The following tables
indicate the maximum resolution under different conditions. Note that resolution is not accuracy.
Resolution defines the minimum definable voltage increment. Absolute DC accuracy and relative accuracy
defines exactly how close the reading will be to the actual voltage input.
DaqBoard/500 Series
ADC INPUT
DaqBoard/500 Series Range Resolution
Bipolar
Programmable
Gain
x1
x2
x4
x8
Unipolar
Programmable
Gain
x1
0 to 10.00 V
x2
x4
x8
879095
Full Scale
Microvolt
Range
Resolution
310.140 µV/bit
± 10.00 V
155.070 µV/bit
± 5.00 V
77.535 µV/bit
± 2.50 V
38.768 µV/bit
± 1.25 V
Full Scale
Microvolt
Range
Resolution
155.070 µV/bit
77.535 µV/bit
0 to 5.00 V
38.768 µV/bit
0 to 2.50 V
19.384 µV/bit
0 to 1.25 V
3
Configuration
3-1
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