Oven controlled resistor article

[Overspeed]

Hello

An oven controlled resistor article , interesting , Isotech propose one also.

Can be interesting to use affordable tempco resistors or use low value resistors as they have usually large tempco value.

Regards
OS

[dietert1]

Probably this serves as a first test. I can imagine some errors they don't consider in their paper:

- Using one TEC only yields a setup with systematic temperature errors caused by a gradient along the device. In order to see the gradient one needs a second NTC sensor. One lesson i learned with this kind of setup: Don't log the temperature sensor used for the PID but a second one.

- In their construct the gradient can be quite large as they integrated the banana sockets into the thermal structure. That means the temperature gradient will depend on what plugs/wires one uses with their device.

- Their 1 Ohm resistor temperature behaviour indicates about 2.8 ppm/K which is a lot. I would try to find a better resistor to start with.

- Another consideration is the thermal behaviour of their standard resistors when a test current is applied. I think that would be an interesting spec when everything depends on Millikelvin temperature deviations.

Regards, Dieter

[TimFox]

Your final lesson about using a second sensor is good advice for any feedback-controlled stabilization system.

[iMo]

Hmm..

[Jacques]

Looks to me like someone forgot a certain Greek letter (thermal EMF, current noise spec)...

Edit: As an aside, I've wondered for some time why none of the usual suspects produce ovenized chip resistor networks. For example, something like the LT5400 with an integrated heater like one finds in some of the voltage references.

[Overspeed]

Looks to me like someone forgot a certain Greek letter (thermal EMF, current noise spec)...

Edit: As an aside, I've wondered for some time why none of the usual suspects produce ovenized chip resistor networks. For example, something like the LT5400 with an integrated heater like one finds in some of the voltage references.

Hello

Could be but all manufacturers need a market and if possible a market or mass production , bespoke products are $$$$ , as the IC with ceramic case rather epoxy or other limited market components.

Other concern is the size now electronic go to ...micro size

Could be possible to recycling a OXCO enclosure and install a resistor but resistor are quite big , another solution is to design a heating cap on TO-3 as they are supplied by Vishay

Regards
OS

[dietert1]

With precision electronics it can be more efficient to have a thermostat for a whole circuit.
I'm right now studying a thermostat for LiPeFo4 batteries, and it turned into a pretty complex setup with an outer TEC oven running at 22 °C and two inner heater ovens for the battery sets running at 23 °C. The outer oven has enough space to contain a large circuit, including voltage references, supply voltage regulators, battery chargers with PWM current control and the analog PID controllers for the two inner ovens. The circuit uses two 8x NOMCT resistor arrays.
Only the two channel peltier controller and the power parts of the regulated supplies are outside.

Regards, Dieter

[Overspeed]

With precision electronics it can be more efficient to have a thermostat for a whole circuit.
I'm right now studying a thermostat for LiPeFo4 batteries, and it turned into a pretty complex setup with an outer TEC oven running at 22 °C and two inner heater ovens for the battery sets running at 23 °C. The outer oven has enough space to contain a large circuit, including voltage references, supply voltage regulators, battery chargers with PWM current control and the analog PID controllers for the two inner ovens. The circuit uses two 8x NOMCT resistor arrays.
Only the two channel peltier controller and the power parts of the regulated supplies are outside.

Regards, Dieter

Hello
I agree as resistor are not the only problem , other act as a ''kettle'' , transistor and Mosfet so they also need temp control.

Perhaps a gaming computer as Watercooling - CORSAIR - H100 RGB AIO can be a nice base ? no electrical wiring inside the temp controled enclosure

Regards
OS

[mendip_discovery]

With precision electronics it can be more efficient to have a thermostat for a whole circuit.
I'm right now studying a thermostat for LiPeFo4 batteries, and it turned into a pretty complex setup with an outer TEC oven running at 22 °C and two inner heater ovens for the battery sets running at 23 °C. The outer oven has enough space to contain a large circuit, including voltage references, supply voltage regulators, battery chargers with PWM current control and the analog PID controllers for the two inner ovens. The circuit uses two 8x NOMCT resistor arrays.
Only the two channel peltier controller and the power parts of the regulated supplies are outside.

Regards, Dieter

That is what is missing from modern metrology. RGB LED lighting effects on all the stuff.





Hello
I agree as resistor are not the only problem , other act as a ''kettle'' , transistor and Mosfet so they also need temp control.

Perhaps a gaming computer as Watercooling - CORSAIR - H100 RGB AIO can be a nice base ? no electrical wiring inside the temp controled enclosure

Regards
OS