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In practice, the thermocouple wire acts a tiny heatsink you lose some heat due to it, a few degrees off....
Thanks, we are measuring D2-PAK, and also a SOIC8 LNK302 IC which has an internal FETWhat FET package are you measuring?
Thanks, and i presume you mean using Kapton tape?, as no other (reasonably priced) tape can remain sticky at temperatures up to 150degC?For SMD parts without heat sink, I would tape the thermocouple to the package top.
Thanks, this is groundbreaking to me.You can use about 2-3 inches of the thermocouple wire and then connect it with regular copper wire.
Stealing this, thanks.In a power IC without dedicated temperature measurement I "misused" the protection diode of a (static) digital input to measure the die temperature. Works great. Very fast and as close as possible at the source of heat.
You just use 3 inches of thermocouple wire, and then for the other 2 metres, you just have it soldered to some twisted pair copper wires...and take it back to the thermopcouple reader like that. Are you sure? It sounds to good to be true
* the body thermometer is optimized for a very narrow temperature range, the thermocouple for a very wide range.
Sorry, no. Common Hg thermometers need two point calibration. For common use, the two fixed points used are the melting point and the boiling point of water.* the body thermometer is an absolute temperature measurement, the thermocouple is a relative measurement.
Even though the glass is highly insulating (thermally) and the temp diff is rather small, the thermometer reports temp rather promptly. A thermocouple needs very little heat to get the temp of the object. Like we do not use thermal grease with clinical thermometers, we need not worry about a nanoliter of glue used to stick the thermocouple.* the body thermometer has a relatively large thermal conductivity area, the thermocouple a very small
The bulb of the thermometer must be at the same temp of the patient; the same condition must be used for the thermocouple junction point.* the body thermometer is surrounded over a length of some centimeters with the same temperature, the thermocouple not.
A simple diode has a tempco of about -2mV/°C, it is easily stackable and can be used for absolute temperature measurement.
A type K thermocouple has a tempco of about 40uV/°C and it measures the temperature relative to the cold junction temperature.
* the body thermometer is an absolute temperature measurement, the thermocouple is a relative measurement.
This has nothing to do with calibration.Sorry, no. Common Hg thermometers need two point calibration. For common use, the two fixed points used are the melting point and the boiling point of water.
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