For third-party calibration of the constant temperature and humidity test chamber, the calibration conditions of the constant temperature and humidity chamber according to the standard requirements are as follows:
First, the environmental conditions
1, temperature: 15 ~ 35 Â° C
2, humidity: 30 ~ 85% RH
3, air pressure: 86 ~ 106kPa
4, load conditions: generally calibrated under no-load conditions, according to user needs can be calibrated under load conditions, but should explain the load situation.
5. Other conditions: There should be no strong vibration and corrosive gas around the constant temperature and humidity test chamber, and other cold and heat sources should be avoided.
Second, standard equipment and other equipment
1. Temperature measurement standard: The temperature measurement consists of a temperature sensor (usually a four-wire platinum thermal resistance) and a display instrument. The time constant should be less than 15 s.
2. Humidity measurement standard: The following instruments can be used for humidity measurement:
Digital ventilation wet and dry meter and barometer (ventilation speed should be greater than 2.5m/s)
Digital hygrometer (used only if the humidity field does not change)
Dry and wet bulb thermometer (for uniform humidity measurement when uniform wind speed)
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