| Autor: |
Harald Schumny, Vladimir Haasz |
| Rok vydání: |
2002 |
| Předmět: |
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| Zdroj: |
Measurement. 31:223-230 |
| ISSN: |
0263-2241 |
| DOI: |
10.1016/s0263-2241(01)00044-6 |
| Popis: |
The precision of dynamic measurement using modular DAQ systems is dependent both on the dynamic parameters of the AD module used, and the EMC conditions in the system case. This can cause difficulties in the correct use of commercially available products. The disturbing magnetic field and disturbances propagating over supply lines cause a decrease in the real effective number of bits of an AD module. Real disturbing fields which influence AD modules have been measured so far in PC systems and in notebooks (for transportable systems), but the method can also be used for other modular DAQ systems. The next source of disturbance — an AC component of supply voltages — was measured in several types of PCs to investigate typical parameters of disturbance propagating over supply lines. The methods for disturbance immunity measurement of AD modules were designed and the system for testing PC plug-in boards with ISA or PCI interface and PCMCIA cards was developed. To describe the disturbance immunity of different types of AD boards, a disturbance immunity factor DIF was defined. All measured values can be used as a base for a limit determination of conventional environments in system cases. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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