1、 Preparation before testing

1. Clearly define testing standards and parameters

• Based on product requirements (such as automotive, electronics, etc.) and referencing relevant standards (such as MIL-STD, IEC 60068, etc.), determineTemperature change rate, temperature range, number of cycles, residence timeWait.

• Note: The thermal rate usually refers to the performance of the equipment when it is unloaded. In actual testing, the influence of sample heat capacity on the rate should be considered.

2. Sample placement and load control

• Ensure sample qualityEvenly placedDo not obstruct the air duct to avoid temperature distribution deviation caused by uneven airflow.

• It is recommended that the load not exceed the capacity of the container1/3~1/2To avoid overloading affecting the temperature change rate and equipment lifespan.

3. Environmental and power inspection

• The equipment should be placed inGood ventilation, no vibration, no electromagnetic interferenceIn the environment.

• Check the stability of the power supply, ensure reliable grounding, and avoid equipment failures caused by voltage fluctuations.

2、 Optimization of operation process

1. Programming skills

• useSegmented programmingReasonably set the heating/cooling slope and holding time to avoid excessive stress on the sample caused by sudden temperature changes.

• Example: If it is necessary to rise from -40 ℃ to 85 ℃, an intermediate transition section can be set (such as every 20 ℃ as a stage) to balance the internal temperature uniformity.

2. Startup and Monitoring

• Before starting, confirm that the box door is tightly closed and the sensor position is correct (usually located at the air outlet or sample area).

• real-time monitoringtemperature curveCompare the set value with the actual value, and pause the adjustment in a timely manner when there is an abnormality.

3. safety protection

• It is strictly prohibited to test flammable, explosive, and highly corrosive substances.

• SettingsSafe temperature range(such as ± 10 ℃ over limit protection) to prevent equipment from losing control.

3、 Equipment maintenance and calibration

1. regular maintenance

• Condenser/evaporator cleaningClean the dust every month to avoid a decrease in cooling rate caused by poor heat dissipation.

• Sealing strip inspectionEnsure the sealing of the box door to prevent leakage of cold/heat.

• Compressor maintenanceRegularly check the refrigerant pressure and lubricating oil status according to the manual.

2. temperature calibration

• Conducted every six months or before important testsThird party calibrationVerify temperature uniformity and fluctuation at multiple points inside the box (such as the 9-point distribution method).

• If self calibration is required, a certified temperature and humidity recorder must be used.

4、 Common Problems and Solutions

5、 Suggestions for improving testing efficiency

1. Batch testing planningConcentrate testing on similar samples to reduce idle running time.

2. Automatic data recordingConnect software through device communication interfaces (such as RS-232, Ethernet) to automatically collect data and generate reports.

3. Pre cooling/preheating managementDuring non testing periods, the device can be set to maintain a standby temperature (such as 25 ℃) to reduce the settling time for the next test.

4. Operator trainingRegular training on equipment principles and emergency response (such as the recovery process for sudden power outages).

6、 Special application scenario precautions

• High humidity environment testingIf combined with humidity cycling, attention should be paid to the discharge of condensed water to prevent sensor short circuits.

• Large sample testingUse extension cables to secure the sensor to key parts of the sample to ensure data representativeness.

• Long term continuous testingArrange equipment rotation rest (such as stopping for 30 minutes every 72 hours) to avoid compressor overwork.