We have build a prototype board based on the CN0287. The documetation for CN0287 say that resistance up to 4kOhm could be measured. With our board in 3-wire-configuration we can only measure up to approximately 2kOhm.
In our opinion the protection resistors in the line to the reference resistor (approximately 1,9kOhm) limits the range to about 2kOhm.
Unfortunately we do not have the CN0287 evaluationboard to measure.
Did anyone measured the PT1000 configuration up to 4kOhm ?