How to Measure High Temperature: Application of LISUN Multichannel Temperature Data Logger and Collaborative Detection Scheme with Oscilloscope

1. Introduction
In scenarios such as industrial furnace operation, high-temperature aging testing of electronic components, and detection of new energy battery thermal management systems, high-temperature measurement needs to meet three core requirements simultaneously: “synchronous multi-point measurement”, “wide-range adaptation”, and “high-precision output”. Traditional single-point temperature measurement equipment has the defects of low efficiency and scattered data, making it difficult to adapt to the measurement needs of complex high-temperature environments; ordinary temperature measurement instruments are prone to signal distortion at high temperatures, leading to increased measurement errors. The LISUN TMP series (https://www.lisungroup.com/products/cfl-testing-instruments/multiplex-temperature-tester.html)multichannel temperature data logger adopts high-precision Type K thermocouples and optimized signal processing circuits, achieving stable measurement in the range of -40~300℃. Its multi-channel design can synchronously collect 8-channel or 16-channel temperature data, greatly improving detection efficiency. Meanwhile, as a core device for capturing electrical signal waveforms, the oscilloscope can verify the accuracy of temperature data conversion and capture abnormal fluctuation signals by monitoring the output signals of the data logger (such as analog transmission signals and communication interface signals), providing double guarantee for the reliability of high-temperature measurement. Therefore, in-depth discussion on the high-temperature measurement scheme of LISUN multichannel temperature data logger and its collaborative application with oscilloscope is of great practical significance for solving high-temperature measurement problems in practical scenarios.

2. Core Technical Characteristics of LISUN TMP Series Multichannel Temperature Data Logger
2.1 Analysis of Core Instrument Parameters
The LISUN TMP series multichannel temperature data logger includes two core models: TMP-8 (8-channel) and TMP-16 (16-channel). Its technical parameters are optimized for high-temperature measurement scenarios, as shown in the following table:

It can be seen from the table that both models adopt Type K thermocouples as temperature sensing elements. This type of thermocouple has the advantages of wide temperature measurement range, strong stability, and high cost adaptability, especially suitable for medium and high-temperature environment measurement of -40~300℃; the measurement accuracy of 0.5% can meet the high-precision requirements of industrial and electronic equipment testing; it supports custom channel order and multiple monitoring modes, which can be flexibly configured according to the actual needs of high-temperature measurement scenarios. Combined with the computer communication function, it realizes real-time export and analysis of data, improving measurement efficiency.
2.2 Technical Basis for Collaboration with Oscilloscope
In the process of high-temperature measurement, the LISUN multichannel temperature data logger converts the temperature signal (analog voltage signal) collected by the thermocouple into a digital signal for processing and output. The oscilloscope can real-time monitor this signal conversion and transmission process by connecting to the signal output terminal of the data logger (such as analog output interface, RS485 communication interface). For example, the oscilloscope can capture the digital signal waveform output by the data logger to verify the stability of the signal: if a temperature sudden change occurs in a high-temperature environment, the oscilloscope can quickly capture the corresponding signal amplitude fluctuation, helping to judge whether it is a real temperature change or equipment failure (such as poor thermocouple contact, signal interference); at the same time, through the waveform analysis function of the oscilloscope, the signal conversion accuracy of the data logger can be further calibrated to ensure the reliability of high-temperature measurement data. This collaborative mode of “data logger collection + oscilloscope verification” provides double technical support for high-temperature measurement.

3. How to Measure High Temperature: Practical Scheme Based on LISUN Multichannel Temperature Data Logger
3.1 Preparation Before Measurement
Equipment Selection and Assembly: Select TMP-8 (≤8 measurement points) or TMP-16 (≤16 measurement points) according to the number of high-temperature measurement points. Match with Type K thermocouple probes to ensure close contact between the probes and the measured object (such as the inner wall of industrial furnaces, the surface of electronic components) to avoid measurement errors caused by poor contact; at the same time, prepare a computer with supporting software for LISUN multichannel temperature data logger, an oscilloscope (it is recommended to use LISUN OSP series digital oscilloscope, which supports high-precision signal capture) and signal connection lines.
Equipment Calibration: Calibrate the thermocouple probe with a standard heat source (such as a high-precision constant temperature box). Place the probe in a high-temperature environment with known temperature, observe the deviation between the measured value and the standard value through the data logger software, and ensure the error is controlled within 0.5%; at the same time, connect the oscilloscope to the signal output terminal of the data logger, observe the signal waveform during the calibration process, ensure the waveform is stable without obvious distortion, and verify the accuracy of signal conversion.
3.2 Parameter Setting and Measurement Implementation
Data Logger Parameter Configuration: Turn on the data logger, customize the channel order (such as sorting by the importance of measurement points) through the “SET” key on the panel, and select the monitoring mode (cyclic monitoring is suitable for continuous high-temperature monitoring, and single monitoring is suitable for fixed-point instantaneous high-temperature measurement); set the data collection frequency through the computer software (adjust according to the high-temperature change rate, such as increasing the collection frequency in the rapid temperature rise scenario), and turn on the data storage and printing functions to facilitate subsequent analysis.
Oscilloscope Collaborative Monitoring: Connect the oscilloscope channel to the signal output terminal of the data logger, set the sampling rate of the oscilloscope (it is recommended to be no less than 1G to ensure capturing high-frequency signal fluctuations) and vertical resolution (8bits and above to improve the ability to identify signal details). Observe the signal transmission status of the data logger through the oscilloscope waveform: under normal circumstances, the signal waveform should show stable periodic changes (corresponding to cyclic monitoring mode) or fixed amplitude (corresponding to single monitoring mode); if waveform distortion or amplitude sudden change occurs, it is necessary to promptly check whether the thermocouple probe is detached and whether there is electromagnetic interference in the measurement environment.
3.3 Data Processing and Abnormal Troubleshooting
Data Export and Analysis: After the measurement is completed, export the temperature data through the computer communication function of the data logger, generate a temperature change curve using the supporting software, and analyze the high-temperature distribution law and change trend of each measurement point; at the same time, combine the signal waveform recorded by the oscilloscope, compare the corresponding relationship between temperature sudden change and signal fluctuation, and verify the authenticity of the data.
Abnormal Handling: If there is a large deviation in the measured data, first observe whether the signal waveform is normal through the oscilloscope: if the waveform is distorted, it may be caused by signal interference, and it is necessary to adjust the connection line between the data logger and the oscilloscope to stay away from strong electromagnetic equipment; if the waveform is normal but the data deviation is large, it is necessary to recalibrate the thermocouple probe and check whether the probe is damaged due to high-temperature aging.

4. Analysis of Typical Application Scenarios
4.1 High-Temperature Aging Test of Electronic Components
In the high-temperature aging test of electronic components such as mobile phone chips and power semiconductors, it is necessary to simultaneously monitor the surface temperature of multiple components to ensure their stable performance in a high-temperature environment below 300℃. The LISUN TMP-16 multichannel temperature data logger can synchronously measure the temperature of 16 components. Cooperating with the oscilloscope to monitor the signal output of the data logger, it can quickly capture the temperature sudden change and signal fluctuation when the components generate abnormal heat, providing data support for judging the reliability of the components; the temperature curve generated by the computer software can intuitively analyze the correlation between temperature and performance during the aging process.
4.2 High-Temperature Monitoring of Industrial Furnaces
During the operation of industrial furnaces, it is necessary to real-time monitor the temperature distribution of multiple points in the furnace to ensure the uniformity of the temperature inside the furnace. The LISUN TMP-16 data logger can cover key areas of the furnace through 16-channel thermocouple probes to achieve 24-hour cyclic monitoring; after connecting the oscilloscope to the data logger, it can real-time capture the signal changes during the heating and cooling process of the furnace, promptly find the temperature fluctuation caused by poor sealing of the furnace, assist operators in adjusting the operating parameters of the furnace, and ensure production quality.
4.3 High-Temperature Test of New Energy Batteries
In the safety test of new energy vehicle batteries in high-temperature environments, it is necessary to synchronously measure the temperature of multiple cells in the battery pack to prevent potential safety hazards caused by local overheating. The LISUN TMP-8 data logger can adapt to the temperature measurement of 8 cells in small battery packs. The oscilloscope captures the instantaneous high-temperature signal fluctuation when the battery cell is short-circuited by monitoring the signal of the data logger, providing key data for the optimization of the battery thermal management system and helping to improve the high-temperature safety of the battery.

5. Conclusion
The LISUN TMP series multichannel temperature data logger provides an efficient solution for high-temperature measurement with the advantages of synchronous multi-channel acquisition, high-precision measurement, and flexible configuration. The collaborative application of the oscilloscope further improves the reliability of measurement data and the ability of abnormal troubleshooting. Through the complete process of “equipment calibration – parameter setting – synchronous measurement – data verification”, accurate measurement in the high-temperature environment of -40~300℃ can be achieved, adapting to the application needs of multiple fields such as electronics, industry, and new energy. With the increasing complexity of high-temperature measurement scenarios, the collaborative scheme of LISUN multichannel temperature data logger and oscilloscope will be further optimized, providing more powerful technical support for high-precision high-temperature detection and promoting the quality improvement and technological innovation of related industries.