After the complement correct cycle, the memory must be rewritten with the corrected data since the address now contains data that is complemented. Full error reporting is available from the DP8400 after the second read, the com- plement read, of memory. This is shown in Table VI.

This method is a very effective tool to avoid system crash due to memory chip failure, and can do much to reduce unscheduled field service calls. The only time the system will see a double error that is not directly correctable is when a double soft error occurs. The probability of this is very low if the previously discussed techniques are used. The extra time taken to do an additional read and write of memory is insignificant when the alternative is a system that has a catastrophic failure that requires immediate field serv-

ice. Using this technique, software may be provided in the system to warn the operator that the system is in a degrad- ed operational mode and that field service should occur shortly. In the meantime, the system will continue to operate properly. The key to the effectiveness of the DP8400 in this application is its three error flags which allow complete error reporting—including a unique double error indication.

DP8402A, 3, 4, 5 32-Bit Error Detector and Corrector (EDAC)

In addition to the popular DP8400-2 16-bit error checker/ corrector, National offers a family of 32-bit Error Detector and Correctors (EDACs). With a few exceptions, the DP8402A, 3, 4, 5 function in a similar manner to the DP8400-2. One major exception is that the DP8402A, 3, 4, 5 are not expandable beyond 32 bits.

TL/F/5012 – 16

FIGURE 12. Double Error Correct Complement Hard Error

Method—1 Hard Error and 1 Soft Error in Data Bits

TABLE VI. DP8400 Error Flags after a Complement Read

AE

E1

E0

Error Type

 

 

 

 

0

0

0

Two Hard Errors

 

 

 

 

1

1

0

One Hard Error, One Soft Check Bit Error

 

 

 

 

1

1

1

One Hard Error, One Soft Data Bit Error

 

 

 

 

1

0

0

Two Soft Errors, Not Corrected

 

 

 

 

10

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National Instruments DP8400 specifications TL/F/5012
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DP8400 specifications

The National Instruments DP8400 is a robust and versatile data acquisition and control platform that stands out in the landscape of advanced instrumentation solutions. Designed to meet the demands of both academic and industrial applications, the DP8400 serves as a comprehensive tool for engineers and researchers alike, facilitating data collection, processing, and analysis in real-time.

One of the key features of the DP8400 is its high-performance data acquisition capability. It supports a wide range of input types, including analog, digital, and thermocouples, allowing users to connect various sensors and devices easily. With sampling rates of up to 1 MHz and resolutions of up to 24 bits, this instrument ensures precise and reliable data capture across diverse applications.

The DP8400 also integrates advanced signal processing technologies, including built-in filtering, signal conditioning, and data preprocessing capabilities. These features enable users to refine their measurements and extract meaningful insights from raw data, reducing the need for extensive post-processing. This is particularly beneficial in complex experiments where signal noise can interfere with results.

Another notable characteristic of the DP8400 is its versatile connectivity options. Users can connect to the device using USB, Ethernet, or wireless interfaces, facilitating seamless integration into existing laboratory setups or remote monitoring configurations. The device is compatible with various software platforms, including LabVIEW and MATLAB, providing users with familiar environments for programming and data visualization.

The DP8400 also boasts robust data storage capabilities, allowing for high-speed data logging and management. With onboard memory and support for external storage devices, users can capture extensive datasets without loss of performance. This is especially useful in long-duration experiments or when conducting time-series analysis.

In terms of durability, the DP8400 is built to withstand challenging environments, featuring rugged housing and protection against dust and moisture. This makes it suitable for both laboratory and field applications, providing reliability in diverse operating conditions.

Overall, the National Instruments DP8400 represents a powerful solution for data acquisition and analysis, combining high performance, advanced features, and exceptional flexibility. Whether for educational purposes, research projects, or industrial applications, the DP8400 is an essential tool for engineers and scientists looking to streamline their data collection and enhance their analytical capabilities. With its user-friendly interface and extensive support, it empowers users to explore new frontiers in measurement science.
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