AC220v contactor fluctuates temperature.

[amodpathak]

I am using 16f876A micro for a temperature controller using thermocoule.when heater contactor starts , temperature goes very high for couple of seconds( it fluctuates for second )
.Any thing I can do for solving this problem.

[Demon]

Temperature of what rises?

Robert

[amodpathak]

Temperature display on seven segment display fluctuates. I used 0p07 and 324n for amplifying thermocouple voltage.

[Demon]

Post your code and schematic.