## Environmental test chamber terminology analysis

Environmental test chamber terminology analysis

1. Volume of test equipment: refers to the actual volume of the space limited by the inner wall of the environmental test chamber, which is 80 liters, 100 liters, etc
2. Working space: refers to the part of the environment test chamber that can keep the specified test conditions within the specified deviation range

For example: you test how big electronic products, how much to put at one time, etc

1. Stable state of the test chamber: refers to the state when the variation of any point in the working space of the test chamber meets the requirements of the performance indicators of the equipment itself

For example: can stabilize 50 degrees in 3 minutes etc

1. Temperature deviation: refers to the temperature difference between the measured high temperature and the measured low temperature and the nominal temperature at each measuring point in the working space within the specified time under the stable state of the test chamber.For example: 2 ℃ or less
2. Relative humidity temperature difference: refers to the deviation between the measured high relative humidity and low relative humidity and the nominal relative humidity at each measuring point in the working space within the specified time under the stable state of the test chamber.For example: + 2 ~ – 3% r.h.
3. Temperature fluctuation: refers to the change of relative humidity at any point in the working space with time in the specified time interval under the stable state of the test chamber.For example: + / – 0.5 ℃
4. Relative temperature fluctuation: refers to the time change of relative humidity at any point in the working space within a specified time interval.
5. Temperature uniformity: refers to the large difference between the temperature at any two points at an instant in the working space under the stable state of the test chamber.

Calculation method: the arithmetic mean value between the measured high temperature and low temperature at each measurement point in the working space within 30min in a stable state.

1. Relative humidity uniformity: refers to the large difference between the humidity at any two points at an instant in the working space under the stable state of the test chamber.

The calculation method is the arithmetic mean value between high temperature and low humidity measured in each measurement within 30min at each measurement point in the working space under stable state

1. Temperature change rate: refers to the transformation rate between two specified temperatures measured at the geometric center point of the working space of the test chamber, expressed in ℃/min.
2. Average rate of temperature change every 5 minutes

The average conversion rate between two specified temperatures measured at the geometric center of the chamber workspace every 5 minutes is expressed in ℃/min.

1. Pressure deviation

In the stable state of the test chamber, the deviation between the measured high and low pressure and the nominal pressure in the specified time at the measuring point of the workspace

1. Rate of pressure change

The rate of change between two specified air pressures measured at the geometric center of the chamber workspace in kPa/min

1. Temperature recovery time

The time required for the workspace temperature to return to the original stable state after reaching a stable state at the specified temperature.

1. Temperature overshoot

When the device heats up or cools down to the specified temperature, the actual working space temperature exceeds the allowable deviation range.