If the third-party calibration of the constant temperature and humidity test box is carried out, the calibration conditions of the constant temperature and humidity test box according to the standard requirements are as follows:

I. Environmental Conditions
1. Temperature: 15-35 (?)
2. Humidity: 30-85% RH
3. Air pressure: 86-106 kPa
4. Load Conditions: Generally, it can be calibrated under no-load conditions. According to user's needs, it can be calibrated under load conditions, but the load situation should be explained.
5. Other conditions: There should be no strong vibration and corrosive gas around the constant temperature and humidity test box, and other cold and heat sources should be avoided.
II. Standardizers and other equipment
1. Temperature measurement standard: Temperature measurement consists of temperature sensor (usually four-wire platinum-making thermal resistance) and display instrument. Time constant should be less than 15s.
2. Humidity measurement standard: Humidity measurement can use the following instruments:
Digital ventilation dry-wet meter and barometer (ventilation speed should be greater than 2.5m/s)
Digital hygrometer (used only when the humidity field does not change)
Dry and wet bulb thermometers (suitable for measuring relative humidity uniformity under uniform wind speed)