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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) 29 Page - Fortune Semiconductor Corp. |
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FS9721_LP1 датащи(HTML) 29 Page - Fortune Semiconductor Corp. |
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29 / 41 page  FS9721_LP1 Rev. 2.0 30/41 14.13 Current Measurement The difference between Current Measurement（A）and Current Measurement（B） is as follow: Mode Mode Current Measurement （A） Current Measurement （B） ADPC1 Open ADPC1 connects to VSS Measureme nt Sampling Resistanc e Measureme nt Sampling Resistanc e A 40A 0.01Ω 40A 4A 0.01Ω mA 400mA 40mA 10Ω 400mA 40mA 1Ω μA 4000μA 400μA 1kΩ 4000μA 400μA 100Ω Max. Voltage Reduction 4V 0.4V J11 J10 uA/mA 10A FS9721_LP1 0.5A/250V 10A/250V COM SMV SGND R17 990 R16 9.99 R29 0.01 SA R18 10k R20 900k DT R19 100k J3 Diagram 26 Current Measurement(A) In TSTB open mode, the current signal enters IC from R20. 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 respectivly through the mode switch. When measuring μA, J10 is open, J11 and J3 is close; when measuring mA, J11 is open, J10 and J3 is close; when measuring the large current by using 10A mode, J3 is close. The maximum reduced voltage for μA, mA and 10A modes is 4V. These voltages are input voltage comparator to compare. If the voltage is smaller than 400mV, the current signal is sent directly to the A/D converter; if the voltage is larger than 400mV, the system will jump up one mode and divide the voltage by R20 and R19, then send its 1/10 to the A/D converter. The accuracy of resistor R16, R17, R29, R19 and R20 influence the accuracy of the current measurement. |
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