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DaqBoard/500 Series 879095 Configuration 3-1
Configuration 3
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.
ADC INPUT
DaqBoard/500 Series Range Resolution
Bipolar
Programmable
Gain
Full Scale
Range
Microvolt
Resolution
x1 ± 10.00 V
310.140 µV/bit
x2 ± 5.00 V
155.070 µV/bit
x4 ± 2.50 V
77.535 µV/bit
x8 ± 1.25 V
38.768 µV/bit
Unipolar
Programmable
Gain
Full Scale
Range
Microvolt
Resolution
x1 0 to 10.00 V
155.070 µV/bit
x2 0 to 5.00 V
77.535 µV/bit
x4 0 to 2.50 V
38.768 µV/bit
x8 0 to 1.25 V
19.384 µV/bit