Three dimensional (three coordinates) detection standard ambient temperature

Conventional production test: 20℃±2℃ (18-22 ℃)

High precision/metrological calibration: 20℃±1℃ or 20℃±0.5℃

Critical Temperature Control Requirements (Must see)

- Temperature change rate: ≤1℃/ hour, ≤2℃/24 hours

- Temperature gradient: the temperature difference per meter in space is less than 1℃, to avoid 

local cold and hot uneven

- Relative humidity: 40%-60%RH, anti-dew, anti-rust, anti-static

Why 20℃

- Minimum thermal expansion and cold contraction of equipment grating, fuselage and 

workpiece, and the most stable measurement datum

- Industry standard temperature, unified calibration and comparison

Would you like me to organize these temperature requirements into a concise instruction sheet 

that can be posted directly in the measuring room?