Here are all the answers except the one about the oscilloscope. I have to admit that I am quite rusty with mine, so I’ll need to re-familiarize myself with it before giving a good information.
Manufacturer and model number: Zhengzhou Dison Instrument and Meter, BB-100
First disconnect the probe from the PCB then measure the resistance:
A to B: 17.1 kΩ, but slowly increasing
B to C: 17.6 kΩ, but slowly increasing
C to A: 35.9 kΩ, but slowly increasing
Reverse the meter’s probes and measure resistance again, this time as:
B to A: 18.2 kΩ, but slowly increasing
C to B: 18.4 kΩ, but slowly increasing
A to C: 36.9 kΩ, but slowly increasing
Since the incubator was warm when I shut it down and started the measure, the fact that the value kept changing in the same direction is most likely because the sensor was slowly changing temperature.
Yes, there are 3 wires coming out of the sensor
The displayed value changes. When I start the incubator, it shows around 21°C. If I set the unit for 37°C, it will progressively get there. If I change it for 31°C, it will gradually get there.
CN6 identifies the whole 7 pin connector, there is another label on the other side of the connector, (CN5) but it identifies the other white connector of 4 pins.