High and low temperature test chamber is not constant temperature, fluctuating large solution

High and low temperature test chamber is not constant temperature, fluctuating large solution
1, adjust parameters, when the device is set, the real-time temperature is close to the set temperature, click the run screen.ldquo AT RDQUO Key, self-tuning PID, please wait patiently, to be on the upper right corner ldquo at rdquo not smooth, indicating that self-tuning
2, sensor or controller ACU module is damaged or poor,The temperature is not stable and fluctuations
3Under normal circumstances, there is no more than one-third of the total volume of the inner box), which leads to failure to circulate
, and the temperature fluctuates.