Omega OMB-DAQBOARD-500 Configuration through Software, Analog Input Configuration, ADC Ranges

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	Full Scale	Microvolt
	Gain	Range	Resolution
	x1		310.140 ∝V/bit
		± 10.00 V
	x2	± 5.00 V	155.070 ∝V/bit
	x4	± 2.50 V	77.535 ∝V/bit
	x8	± 1.25 V	38.768 ∝V/bit
Unipolar
	Programmable	Full Scale	Microvolt
	Gain	Range	Resolution
	x1	0 to 10.00 V	155.070 ∝V/bit
	x2	0 to 5.00 V	77.535 ∝V/bit
	x4	0 to 2.50 V	38.768 ∝V/bit
	x8	0 to 1.25 V	19.384 ∝V/bit

DaqBoard/500 Series 879095 Configuration 3-1