Download Real Temperature
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Thanks @martiniman, your code runs through without a problem after adjusting to my variable names. Just that the end result (______) as the final feel temperature seems slightly off.
Logically, the temperature of the bed is measured at the thermistor, not the upper surface. There is no reliable way to get from the former to the latter as it depends on a lot of environmental factors which can vary quite a bit depending on the specific circumstances. With a printer that ships in its stock configuration without an enclosure trying to stay uniformly far below 10% error on the upper side of the bed is a steep demand. Which of the competition is far superior in this regard?
Hottest point on bed, due to mini ratio between heater and bad size drift between hottest and green inside the circle 2C. prusa thermistor is in this location but on the other side.
T1 location measure as can be seen temperature matches between multimeater and thermal camera.
When someone jumps to "lawsuit" for a possibly defective part or because the printer they have been using successfully for over a year has temperatures different on an uncalibrated thermal camera out in the open than what the thermistor says... then there's probably no making you happy.
So according to str0gg's own measurements the heat bed has at the centre a temperature of 104C when set to "110C" and at the very most peripheral edge still 93C. The majority of the bed is therefore within 10% error rate. I am not sure what level of precision some are expecting for a hobbyist tool. It is next to impossible to have a totally homogoneous temperature, as you'll always have a gradient towards the edge. One can try to reduce that gradient but without a fixed enclosure it is very hard to do, as one might easily overcompensate under certain conditions which is actually worse than staying below the set temp.
@Thejiral you made it completely wrong. 104C its at heater located top right from the center on the printer with custom firmware which allows to set 110C at center it was 100 or 101 if remember correctly. On the photo on the edge (93C) was to prove that 2 device from different companies which are using different ways of measuring show the same value. That proves that measurement is correct. Which brings to point that there must be in firmware additional something which force printer to work below set limit. Device is in enclosure which after preheat keeps temperature so environment for me is homogeneous.
Just a minor nit - percent error doesn't work well with temperature. You would get different acceptable ranges for Celsius, Fahrenheit, and Kelvin. And, there is nothing special about 0C that would cause you to expect measurements at that temp to be perfect.
I'm not exactly sure what the expected range should be. Maybe all but the edges of the bed should be within 10C of the set temperature? Outside of that range, the print may be significantly affected.
^^ Point taken. Percentages are a flawed way in that regard.
The "special" temperature is not 0C but room temperature, or rather the localized surrounding temperature. So the delta temp. is what we should rather base a percentage error on. The greater the temperature gradient the higher the temperature losses on the edges.
The heating range is quite good on an Mk3 or Mk4 with 120C. Given I have no issues whatsoever with printing PC-Blend on my Mk3s in an enclosure at a setting of "115C", I can't see any limitation there. Well, at least there are no issues beyond what one can expect from such a demanding material without printing at +70C enclosure temperature.
The thing is, that bed temp, doesn't need to be super precise for successful prints. Other factors are way more impactful on bed adhesion than a few C up or down. That said, it is a good idea to always centre prints on the bed if high bed temps are used (for ASA, ABS etc) but then for those materials usually an enclosure is a must anyway and then the temperature decrease towards the edge will be less severe.
Overnight during my Sleep comfort setting, I want to track the temperature difference between the Master remote sensor and the Main thermostat sensor. I have a simple piston that updates a global variable calculated using [Master Sensor : temperature] - [ecobee Main : temperature].
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I've tried both searching these forums and searching with Google, but I haven't been able to find an answer to this question: Since k10temp doesn't report real processor temperature, how can I calculate the real temperature from the values that k10temp provides?
I know that the readme-file from kernel states that the temperature value that k10temp-module provides is supposed to be relative to something and not the actual temperature, but what is it supposed to be relative to? And how can I use this information to calculate the actual temperature (in Celsius)?
If I understand correctly, the K10temp is an internal sensor built into the AMD die; as such it should be pretty good representative of the junction temperature. When the junction temperature increases, heat flows out of the processor package to the heatsink, where it is ultimately carried away by either passive or active convection. The die has a low thermal mass, and there can be significant thermal resistance between the die, through the case, into the heat sink. A heat sink can have a significant thermal mass.
What the heck does all of this mean? You might be astonished how fast the K10temp changes when the processor is working hard given even a small thermal resistance from the die to the heatsink. I would easily believe that a processor going from idle to 100% could see temperature changes of 10 to 20 degrees C per second in the K10temp. Heat sink temperatures, given these conditions might be one or two degrees per second until the fans spin up.
What do you mean by 'Real Temperature' ??
The case temperature of the processor? You need to know the thermal resistance of the package, the thermal resistance to the heatsink, and the thermal mass of the heatsink.
The exhaust air temperature or the heat sink temperature? To many variables to enumerate.
In my mind, the real temperature is the junction temperature. Everything else predicts whether T sub J can be maintained in the ambient conditions.
From what I read, people are trying to calculate the case temperature from the junction temperature given a constant processor load.
The temperature value returned by the coretemp driver isn't absolute. It's a thermal margin from the critical limit, and the greater the margin, the worse the accuracy. It isn't really returning degrees Celsius. At high temperatures, the (small) thermal margin is almost expressed in degrees Celsius, but at low temperature, the (high) thermal margin is no longer expressed in actual degrees Celsius.
So, if the temperature value reported by coretemp is unrealistically low, all it means is that you are far away from the critical limit so your systems are running totally fine and cool and you don't have to worry at all. Unfortunately, there is no way to improve the readings, this is a hardware limitation.
Additionally, the critical limit value may be wrong on come CPU models. We may be able to address this problem over time, but again it's not really a problem in the first place. All that really matters is how far the measurement is from that limit. If the difference is above 40 pseudo degrees Celsius (again these are not real degrees Celsius!) then you're safe.
There is one temperature measurement value, available as temp1_input in
sysfs. It is measured in degrees Celsius with a resolution of 1/8th degree.
Please note that it is defined as a relative value; to quote the AMD manual:
Tctl is the processor temperature control value, used by the platform to
control cooling systems. Tctl is a non-physical temperature on an
arbitrary scale measured in degrees. It does _not_ represent an actual
physical temperature like die or case temperature. Instead, it specifies
the processor temperature relative to the point at which the system must
supply the maximum cooling for the processor's specified maximum case
temperature and maximum thermal power dissipation.
Anyway, I guess what I'm looking for in the "Real Temperature" is how to approximate the pseudo degrees to real C degrees, if that's even possibly in any feasibly way. In the right ballpark would suffice. 5376163bf9
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