QX/T 16-2020 in English

5.3 Temperature and humidity deviation requirements

• Temperature deviation: ≤±1.0℃ (20% increase over the 2002 version)
• Humidity deviation: ≤±2%RH (new quantitative indicator)

5.4 Uniformity control

• Temperature uniformity: ≤0.3℃ (spatial temperature difference control)
• Humidity uniformity: ≤1%RH (new key indicator)

Calibration box selection recommendation

1. Select humidity control principles such as dual temperature method/diversion method according to the type of instrument under test
2. Working volume should be ≥ 3 times the volume of the instrument under test
3. The communication interface needs to be compatible with industrial protocols such as RS485/Ethernet

Precautions for use

6.3.4 Optimization of point layout scheme

• 9-point layout method: When the height of the effective working area is ≥50cm, a three-dimensional point layout is adopted
• 5-point simplified method: When the height is <50cm, a planar point layout scheme is adopted

Data collection specifications

Record once every 2 minutes, and make 15 consecutive measurements (Clause 6.3.5) to ensure:

• Temperature sampling interval ≤ 15 seconds (required by Table 1)
• Humidity response time ≤ 15 seconds (required by Table 1)