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makerbase-mks / MKS-Robin-Nano-V3.X

Robin nano V3 is an upgraded version of Robin Nano V2.0. The upgrade changes are quite large, including upgrading the MCU to the M4 core, and adding support for USB disk.
GNU General Public License v3.0
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PT1000 in 4.7k mode temperature swings #61

Open xPakrikx opened 3 years ago

xPakrikx commented 3 years ago

Temperature readings from PT1000 with 4k7 pullup is very inaccurate (1-2C deviation) and unstable with cold hotend, with heated hotend i see temperature swings ~5C, even after calibration. What precision can be achieved in 4.7k pullup ? Or MAX31865 is recommended, if that's even possible to connect ?

MKS nano V3 + PT1000 4k7 (calibration + temp test) - Flsun Marlin 2.0.8 243686712_3122797784620053_8510577080589959212_n

SKR 1.3 + PT1000 4k7 (calibration + temp test) - Flsun Marlin 2.0.8 243878137_3123029047930260_4188667032210543518_n

mks-viva commented 3 years ago

4.7K is 1% Usually, to connect an external PT100 module, it is necessary to remove the 4.7K pull-up. You can try it