measurementthermocoupleWhen it comes to insulation resistance, the following technical requirements should be met:

1Thermocouples should undergo insulation resistance testing according to the original assembly method at the time of shipment.

2The accuracy of instruments used for measuring insulation resistance shall not be lower than±20%.

3The test voltage for insulation resistance at room temperature is DC（500±50）VTest voltage for insulation resistance at upper temperature limit: DC（10±1）V.

4The atmospheric conditions for measuring insulation resistance at room temperature are: temperature15-35℃Relative humidity45%Atmospheric pressure86-106kpaThe thermocouple under test should be placed in such atmospheric conditions at least before the test2h.