13
Overview
Contents
Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Safety Symbols Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Introduction
The VMIVME-3126A High Resolution, Isolated Analog-to-Digital Converter board
has 16 independent isolated input channels with 16-bit resolution. Each input has a
dedicated Analog-to-Digital Converter (ADC), input conditioning, reference, and
power supply. Each channel is isolated with opto-isolators from the VMEbus and the
digital circuitry. Self-test is initiated by a VMEbus system reset or by execution of a
software command. A Digital Signal Processor (DSP) provides control and software
correction data. An Electrically Erasable Programmable Read-Only Memory
(E
2
PROM) loads offset and gain coefficients into the DSP during a reset condition. The
offset and gain coefficients can be recalculated by the user by entering the
Calibration
Mode
. Software filtering is also done by the DSP to a user-defined cut off frequency.
The following brief overview of principal features illustrates the flexibility and
performance that is available with the VMIVME-3126A board:
• 16-Analog input channels:
(1) Input-to-input and input-to-VMEbus isolation
(2) ADC per channel
• RTD Excitation Source (200
µ
A/400
µ
A) per channel
• Open transducer detector per channel
• Full board or user-selected channel calibration
• Unipolar/Bipolar full-scale ADC ranges from 5 mV to 10 V
• Self-Test:
(1) Initiated on power-up or any reset condition
(2) Extensive onboard diagnostic testing capability
(3) Status to user-accessible register
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