ABB CPU控制器 自動化 PPD113B01-10-150000 PPD113B03-26-100110 PPD115A102

?PPD113B01-10-150000 PPD113B03-26-100110 PPD115A102

用高端電流檢測技術(shù)。 對于較低的RTD引線電阻值，此技術(shù)可降低3線模式下電流失配的影響。 有關(guān)3線RTD配置的更多信息，參見電路筆記CN-0383。?
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基準電阻(RREF)選擇為3.92 kΩ，最高支持850°C的Pt1000 RTD測量（850°C時RTD電阻為3.9048 kΩ）。 RREF的值必須根據(jù)RTD的最大預(yù)期電阻來選擇。 RREF電阻的精度直接影響測量精度，因此，必須使用精密、低漂移電阻。?
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4線模式下，激勵電流必須設(shè)置為250 μA，3線模式下設(shè)置為100 μA。 對于4線模式，假設(shè)RTD值為3.92 k?。 來自AIN0的激勵電流流經(jīng)RREF + RRTD + RRETURN = 3.92 k? + 3.92 k? + 3 k? = 10.84 k?。 因此，AIN0處的電壓等于250 μA × 10.84 k? = 2.71 V。AD7124-4指定激勵電流輸出端的輸出順從電壓為AVDD ? 0.35 V，即3.3 V – 0.35 V = 2.95 V。 因為2.95 V > 2.71 V，所以即使對于最大RTD電阻，250 μA激勵電流也能正常工作。?

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