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Please help. NI USB-TC01 has problems with Type S thermocouple

HI , Everyone,

Please check attached file. I tested the NI USB-TC01 with a type S thermocouple in a furnace. The furnace temperature was set to increas to 1300 oC. But during the furnace heating up over 1100 oC (shown on the furnace controller), the reading of NI USB-TC01 started to drop down to 800 oC even the real temperature was kept increasing.  I used another thermometer to read from the S thermocouple.  The thermometer's reading showed the same temperature as that from the furnace controller.

Also I noticed the reading of NI USB-TC01 kept dropping from room temperature to 0 oC before the furnace started running.

When the NI USB-TC01 connecting with a  type B thermocouple, there is no such problems. Is there any special care needed to Type S thermocouple using NI USB-TC01?

Thanks,

Xu

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