Pt1000/100 R value not working as expected

moth4017

Ver 3.5 b2
if i connect a PT100
M308 S1 P"F.8" Y"rtd-max31865" F50 R430
this works

if i connect a PT1000
M308 S1 P"F.8" Y"rtd-max31865" F50 R4300
This does not work value displayed in DWC 2000C

If i connect a PT1000
M308 S1 P"F.8" Y"rtd-max31865" F50 R430
this works

it seem the selecting R4300 for the PT1000 isnt working as expected

T3P3Tony

@moth4017 are you using a PT100 daughterboard? It has a reference resistor value of 400Ohms. Its designed for use with PT100 sensors and the MAX31865 chip requires a 4:1 ratio between reference resistors and nominal sensor resistance.

This is only configurable to allow for other implementations of a MAX31865 circuit with a difference reference resistor to be used.

Also, the pin name F8 does not look right so i guess this is not a Duet board?

moth4017

@T3P3Tony im using a octopus pro v1 , has the max 31865 on board.

they use a ref 430R and a 4k3

T3P3Tony

@moth4017 possibly @jay_s_uk can help then?