Temperature rise testing plays a crucial role in evaluating the performance and reliability of electronic products. A well-constructed temperature rise model not only helps engineers validate the design's stability and efficiency but also offers a comprehensive insight into the product’s overall thermal behavior. So, how can you accurately capture the temperature rise curve during testing?
**First, Understanding the Temperature Rise Test**
To assess the lifespan and stability of electronic devices, it is common to monitor the temperature of critical components such as IC chips and IGBTs. The device under test is placed at a controlled ambient temperature—like room temperature—and then operated. As it runs, the temperature increase above the ambient is recorded. This data is then compared against standard allowable values to determine if the design meets the required safety and performance criteria.
The primary goal of this test is to track the temperature changes at various points. Engineers observe whether the temperature curve behaves as expected—whether the rise is within acceptable limits. If any anomalies are detected, the test is paused, data is saved, and further analysis is conducted to identify the root cause. Figure 1 shows an example of a temperature rise curve.
**So, How Is Temperature Rise Recorded and Operated?**
**1. Traditional Testing Methods**
In the past, data was collected manually using basic data acquisition tools, and Excel was often used for processing. This method involved subtracting the ambient temperature from the measured temperature. However, traditional approaches are time-consuming, error-prone, and lack precision.
**2. New Digital Testing Method**
Modern methods use the Delta technique, where the difference between the input (component temperature) and a reference channel (ambient temperature) is measured. This approach simplifies the process by directly calculating the temperature rise relative to the environment. As shown in Figure 2.
**Second, Building the Test Environment**
For example, during a power supply temperature rise test at 25°C, thermocouples of various types (such as K, J, T, or E) are typically used to measure key components like IGBTs and inductors. These thermocouples are carefully attached to the surface of the components and connected properly.
Thermocouple installation involves placing the probe close to the target area and securing it with adhesive. The wiring inside the device should be neatly organized using high-temperature tape, cable grooves, or wire channels. The thermocouple leads must not be routed through unsafe areas like inlets or outlets.
When two different conductors or semiconductors form a loop, and their junctions are at different temperatures, a voltage is generated due to the thermoelectric effect. This principle is used in thermocouples to measure temperature differences accurately.
**Third, Multi-Level Cascaded Data Acquisition**
When multiple measurement points are spread out, it's practical to install separate data loggers to avoid long signal cables. Using cascading techniques, the DM100 data acquisition recorder can support up to 200 channels, offering high scalability and flexibility for complex setups. Figure 4 illustrates the cascading configuration.
**Fourth, Data Summary and Operation**
The analog signal acquisition modules use 32-bit ADC for high accuracy, with DC voltage precision up to 0.05%. Simultaneous sampling across modules ensures accurate timing, with a maximum sampling rate of 100ms per 10 points. The 1000V AC isolation between channels minimizes interference, while built-in digital filters help eliminate noise and ensure stable operation in industrial environments. Figure 5 shows the data exported via a web interface.
The ZLG Zhiyuan Electronics DM100 and DP100 data acquisition recorders are modular, versatile tools designed for diverse applications. They support a wide range of sensor inputs, including DC voltage, current, digital signals, and environmental parameters like temperature and humidity. These devices offer real-time monitoring, flexible data processing, and reliable storage, making them ideal for both lab and field use. Whether for development, testing, or production, these recorders provide a complete solution for accurate and efficient data acquisition.
Spot Lights Moving Head ,Led Moving Head Spot,Moving Head Spotlight,Spot Moving Head Light
Guangzhou Cheng Wen Photoelectric Technology Co., Ltd. , https://www.cwledwall.com