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LMP90100: LMP90100测试三线的PT100,

Part Number: LMP90100

 按照上图手册里的接法测试PT100,PT100每根引线电阻大概0.2Ω,RREF=2K,使用VREF2作为参考,电流激励1mA,采集CH0=VIN0-VIN1没问题。当采集CH1=VIN1-VIN6 的时候,采集到的AD值有的时候是正有的时候是负值是怎么回事?按理说CH1应该在+0.2mV左右,应该一直是正的。