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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FS9721_LP1 датащи(PDF) 30 Page - Fortune Semiconductor Corp. |
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FS9721_LP1 датащи(HTML) 30 Page - Fortune Semiconductor Corp. |
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30 / 41 page  FS9721_LP1 Rev. 2.0 31/41 R17 99 R16 0.99 R29 0.01 uA/mA 0.5A/250V 10A 10A/250V J11 J10 COM ADPC1 SA SGND FS9721_LP1 R18 1k _ + R9 90k R8 10k OP1O OP1N Diagram 27 Current Measurement(B) In TSTB connecting to VSS mode, the current signal enters IC from SA. When doing the current measurement, The sampling resistance of μA mode is R16+R17+R29, the sampling resistance of mA mode is R16+R29, and the sampling resistance of 10A mode is R29. They are measured respectively through the mode switch. When measuring μA, J10 is open and J11 is close; when measuring mA, J11 is open and J10 is close; the large current enters directly via 10A port. The maximum reduced voltage for μA, mA and 10A modes is 0.4V. These voltages are input voltage comparator to compare. If the voltage is smaller than 40mV, it will be sent to ×10 times ampifier to amplify, then sent to A/D converter; if the voltage is larger than 40mV, the system will work the auto-ranging signal, and jump up one mode under the control of microprocessor and send the current signal directly to the A/D converter. The accuracy of resistance R16, R17, R29, R8 and R9 affects the accuracy of the current measurement. |
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