System accuracy is an important assessment indicator for automatic test system, which is influenced by many factors such as instrument, person, and environment. The paper takes a set of automatic motor testing system for an example, the mathematic relationship between the system accuracy and the precision of instrument transformers was analyzed, which also provides a theoretical reference for the precision selection of instrument transformer when the system accuracy was known. Some improved measures such as the selection of measuring point and the calibration of transformer ratio and phase angle are put forward. Testing results verified its simplicity and efficiency, besides the novelty above, the paper also provides a new idea to improve the system accuracy of constructed test platforms without increasing the cost for exchanging a matched transformer.
To elucidate respective effects of sodium and chloride ion on filament formation in Zymomonas mobilis232B culture induced by NaCl, the morphological changes of cell grown in medium containing 0.2 M (NH 4 ) 2 SO 4 , Na + (as Na 2 SO 4 ) and Cl -(as NH 4 Cl) were observed using a scanning electronic nicroscope (SEM). The occurrence of filament formation began as early as 4 h after exposuring to NaCl and Cl and the length was approximate 10 to 15 μm after exposuring for 20 h, which was 3 to 5 fold longer compared to normal cell, while Na + and (NH 4 ) 2 SO 4 treated cells kept normal morphology, indicating that filament formation in NaCl-inhibited Z. mobilis cultures is attributable to chloride ion. In the presence of 0.2 M chloride ion, increase in cell number stop almost immediately, whereas cells continued to elongate slowly, suggesting that chloride ion has a direct inhibitory effect on cell division.
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