About a half year ago I bought some lm75a temperature sensors from eBay.
I placed two in a power supply, to measure the internal temperature on two positions, to switch a fan when the temperature passes a certain threshold.
Now it appears that the measured temperature is completely off.
They drift off a lot, to high values, but the strange thing is that the both keep in pace. Also when the fan switches on, the measured temperature of both sensors drops down.
But the measured temperature is much higher than the real temperature.
Does anybody have similar experience?
Is it a penalty for buying components on ebay?
Any comments are welcome.
thanks,
Gerrit.
