The dead zone in a pyrometer is 0.125% of span. The calibration is 400°C to 1000°C. What temperature change might occur before it is detected.

The dead zone in a pyrometer is 0.125% of span. The calibration is 400

1.	The dead zone in a pyrometer is 0.125% of span. The calibration is 400°C to 1000°C. What temperature change might occur before it is detected.
A.	0.125°C
B.	0.75°C
C.	0.4°C
D.	1°C
Answer» C. 0.4°C