Overview
Introduction
This document will primarily describe the operation of the DAC board, but some details of the VMIVME-3100 ADC Board and the VMIVME-3200 32-channelmultiplexer (MUX) board will be included for clarity. It is also intended to give the user a better understanding of the test capabilities of a data acquisition system using the DAC board in conjunction with the VMIC MUX expander board (VMIVME-3200)and the ADC board (VMIVME-3100). For a thorough understanding, the reader should have access to the following documents：
• VMIVME-3200 32-Channel Analog Input (MUX) Instruction Manual (Document
• VMIVME-3100 12-Bit Analog-to-Digital Converter (ADC) Board Instruction Manual. Features listed below are the primary features of the VMIVME-4116 DAC board:
• 16-Bit resolution
• Buffered voltage output (±10 V @ 5 mA)
• Double-buffered data latches
• Four or eight channels (option dependent)
• Eight 16-Bit DACs (one per channel)
• Front panel Fail LED
• High reliability DIN type output connector
• Multiplexed programmable outputs for testing analog input multiplexer boards
• Multiplexed programmable outputs for testing analog outputs
• Jumper-selectable synchronized update control
• Selectable exteral update control input provides a single update strobe for all
• Fast settling: 10 µs maximum to ±0.0003 percent of FSR
• Requires VMIVME-3100 ADC for Built-in-Tes
A unique feature of the VMIVME-4116 DAC Board is the Built-in-Test logic that allows the testing of any one of the analog output channels through the use of anon-board multiplexer and the VMIVME-3100 ADC Board. When in test mode, the field connections through connector P3 may be isolated, and any of the eight channels may be routed to the 8-bit VMIVME-3100 ADC board via VMIC's analog backplane(AMXbus™). At the VMIVME-3100 ADC board, under program control, the analog signal may be converted to a 12-bit digital word and compared with the original 16-bitword written to the DAC board. In this manner, each of the eight analog output channels may be verified without disturbing the field-connected devices. However, the full accuracy of the analog outputs cannot be determined by a 12-bitVMIVME-3100 ADC. The analog output channels may also be multiplexed to the analog test bus simultaneously while controlling the P3-connected field devices, providing real-time fault detection of the outputs. If a board fails the self-test, a Fail LED on the front panel may be turned ON to indicate the board is in a failed condition.
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