Ferrite rings for thermocouple wires.

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T

treez

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Hello,
We recently measured the temperatures of the components of our 60W Flyback SMPS with many k type thermocouples, whilst it was in the thermal chamber.

Obviosuly, the power cable to the converter, as well as the thermocouples, go through the same chamber port in order for us to connect to the data logger and mains power supply

Only one thermocouple, the one that was measuring the internal ambient of the chamber, was giving noisy readings. We wish to buy some ferrite rings so that the thermocouple wire can be threaded through it to mitigate noise issues.
(I don’t think we need a shielded thermocouple since this thermocouple was further away from switching voltages on the PCB than other thermocouples)

Can you suggest anywhere to buy these below ferrite rings cheaper? (there is a £15 postal charge to uk)
https://uk.farnell.com/fair-rite/5961001101/ferrite-core-toroid-61/dp/1781375?st=ferrtie torroid
 

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