Measurement Computing CIO-DAS08-AOH - Manual (Page 5)

1 INTRODUCTION
The CIO-DAS08-AO family of boards, referred to as CIO-DAS08-AOx in this manual, has three members. Where specific
aspects of a board are described, the specific part number CIO-DAS08-AOH, CIO-DAS08-AOL, or CIO-DAS08-AOM are used.
The three boards differ only in the A/D gain ranges. The AOH has 'high' gains, the AOL has 'low' gains, and the AOM has
'MetraByte' gains and gain codes.
The analog amplifier is located approximately in the center of the board. The amplifier on the CIO-DAS08-AOH and
CIO-DAS08-AOM is part number PGA202. The amplifier on the CIO-DAS08-AOL is part number PGA203.
The CIO-DAS08-AOx boards are an extension of the popular CIO-DAS08 architecture. The two boards are identical at the
register level, performance and connector with the following exceptions.
1. Gains are software-programmable. There is only one version of the MetraByte DAS-8AO with gains of 0.5, 1, 10, 100,
and 500. Measurement Computing offers two versions. They are the CIO-DAS08-AOH and CIO-DAS08-AOL. The 'H'
gains are 0.5, 1, 5, 10, 50, 100, 500, and 1000. The 'L' gains are 0.5, 1, 2, 4, and 8.
2. Analog inputs are differential vs. the single-ended inputs of a CIO-DAS08. To maintain compatibility with signal
conditioning boards such as the CIO-EXP16, an optional SIP resistor provides ground reference to the CH LO inputs.
3. A stable crystal oscillator provides the A/D pacer clock pulse. To allow software-compatibility with programs written for
the CIO-DAS08, a jumper is provided to choose between the crystal or the PC Bus clock.
4. A DC/DC converter supplies stable +/-15V power to the analog circuitry. An optional version of the board without the
DC/DC converter is available on special order of 10 or more units. The cost is lower but the ranges of analog inputs are
limited.
5. There is a second digital connector on the CIO-DAS08-AOx as there is on the CIO-DAS08. The MetraByte DAS-08AO
does not provide the additional digital I/O lines.
2 SOFTWARE INSTALLATION
Before you open your computer and install the board, install and run InstaCal™, the installation, calibration and test utility
included with your board. InstaCal™ will guide you through switch and jumper settings for your board. Detailed information
regarding these settings can be found below. Refer to the Software Installation manual for InstaCal™ installation instructions.
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