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A/D Board Tutorial
Slideshow Contents
Introduction
Typical A/D Board Architecture
A/D Chip Technology
Resolution and Input Range
Input Bandwidth
Input Channel Configurations
Differential Input Simulation
A/D Sampling Methods
A/D Triggers
Sampling Sequences
Data Transfer to Memory
Interrupt Timing
Source Impedance
Source Impedance - Solution
Calibration
Autocalibration
Comparison Test: Autocalibration vs. Manual Calibration
Results: Autocalibration vs. Manual Calibration
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Comparison Test: Autocalibration vs. Manual Calibration


A test was conducted to compare the performance of an autocalibrating A/D board vs. a manually calibrated board. A Diamond Systems DMM-32-AT autocalibrating A/D board and a competitor's manually-calibrated A/D board were selected for the test. Both boards are advertised by their manufacturer as operating over the temperature range of -40 to +85 degrees C.

The two boards were installed on an embedded CPU, and the assembly was placed in a temperature chamber. Outside the chamber was a precision voltage source and a precision voltmeter with serial port output. The voltage source was connected to both A/D boards and the voltmeter. The CPU was connected to the voltmeter's serial port.

As the temperature swept through the test range of -40 to +85 degrees C at 5 degree increments, the test program read the A/D values from both boards and compared them to the meter reading (via the serial port). At each test temperature, multiple readings were taken and averaged to eliminate noise. Every 5 degrees, the autocalibrating board was recalibrated via its software driver.

The errors were logged and graphed. (See next slide.)