Help me to Repair my Hart Scientific 1560 -2566 data logger

[salayhan]

Hello,
Does anyone know what the NTC features that measure CJC on the Hart Scientific 1560 2566 Datalogger TC sockets are?

[Swake]

Looks more like thermocouples. Most used is type K.

[salayhan]

Looks more like thermocouples. Most used is type K.

It's not a k-type thermocouple. I've tried.
I couldn't find the circuit diagram.
I used 10k ntc. but what is the original ntc

[Swake]

Ho, you mean those things glued on the connector. Didn't understand you first message very well with all those abbreviations.

NTC, maybe, it can be a PTC too (think PT100).

Best you can do is desolder and measure.
Next is to gently remove the goo from that thing and read whats written on it.
Or reverse engineer the circuit up to the chip doing the heavy lifting. With a lot of luck you can determine what it is based on an application note or maybe the voltage divider that it is part of.

[mzzj]

Ho, you mean those things glued on the connector. Didn't understand you first message very well with all those abbreviations.

NTC, maybe, it can be a PTC too (think PT100).

Best you can do is desolder and measure.
Next is to gently remove the goo from that thing and read whats written on it.
Or reverse engineer the circuit up to the chip doing the heavy lifting. With a lot of luck you can determine what it is based on an application note or maybe the voltage divider that it is part of.

According to manual it is thermistor.
--
3rd. option is to try to substitute the component with resistance decade and follow the cold junction value on DUT.
You might have to do this anyways if you need to fiqure out what Beta value to select for the NTC.

You also need to adjust and calibrate the cold junction compensation after you have replaced the thermistor. See manual section 13.4.3 Calibration Procedure.
Calibrating it to factory specification can be a bit tricky but there is alternative way of doing it.

[Arhigos]

Looks more like thermocouples. Most used is type K.

It's not a k-type thermocouple. I've tried.
I couldn't find the circuit diagram.
I used 10k ntc. but what is the original ntc

White color stands for U-type thermocouple.