Operation Guide for Oven Temperature Tester

1. Purpose

2. Scope of Application

3. Equipment and Tools

1. Oven Temperature Tester: [Brand and Model], with supporting temperature sensors.
2. Protection Devices: Heat insulation covers, high-temperature tapes.
3. Auxiliary Tools: Computer (installed with supporting analysis software for the oven temperature tester), data transmission cables.

4. Preparation Before Operation

(1) Equipment Inspection

1. Appearance Inspection: Carefully check whether the outer shell of the oven temperature tester is damaged or deformed, whether the display screen is intact, whether each button can be pressed normally, and whether the temperature sensor cables are broken or damaged.
2. Battery Level Check: Connect the tester to the power supply and check if the battery level is sufficient. If the battery level is low, use a dedicated charger to charge it. Ensure the charger is firmly connected during charging to avoid poor contact.
3. Function Test: Turn on the oven temperature tester and check if all functions of the instrument are normal. Perform a self-calibration operation on the instrument in accordance with the equipment manual. If abnormalities occur during calibration, contact equipment maintenance personnel in a timely manner.

(2) Test Plan Development

1. Determine the test point positions based on production process requirements and test objectives. For example, in reflow oven testing, temperature sensors should be arranged at representative positions on the PCB board, such as chip pins and large-sized component pads.
2. Clarify the test cycle. Determine the time interval for each test based on factors such as production batches and equipment stability to ensure the real-time and effectiveness of oven temperature data.

(3) Test Equipment Installation

1. Sensor Installation: Use high-temperature tape to firmly attach the temperature sensor to the selected test point. Ensure the sensor is in close contact with the test point to obtain accurate temperature data. To prevent the sensor from falling off during the test, additional fixing devices can be used for reinforcement.
2. Heat Insulation Cover Installation: Install the heat insulation cover on the oven temperature tester to provide protection for the tester and prevent damage in a high-temperature environment. Ensure the heat insulation cover is firmly installed without looseness during installation.

5. Test Operation Steps

1. Parameter Setting: Set test parameters on the oven temperature tester, including sampling frequency, test time, and storage path. The sampling frequency should be set reasonably according to test requirements to ensure accurate capture of oven temperature changes.
2. Start the Test: Place the installed oven temperature tester and sensors into the test equipment (such as reflow oven, wave soldering oven), and start the test equipment to begin the test. During the test, do not open the door of the test equipment or perform other operations that may affect the test results.
3. Data Recording: The oven temperature tester automatically records the temperature data during the test. Operators can observe the real-time temperature change curve through the tester's display screen. If abnormal conditions are found, stop the test immediately and check if the equipment and sensors are normal.

6. Data Processing and Analysis

1. Data Transmission: After the test is completed, take the oven temperature tester out of the test equipment and cool it to room temperature. Connect the tester to the computer using a data transmission cable, and transmit the test data to the oven temperature analysis software in the computer.
2. Data Analysis: Open the oven temperature analysis software and analyze the transmitted data. The software can generate oven temperature curves, temperature statistical reports, etc. Operators should evaluate the oven temperature curve according to production process requirements to determine whether the oven temperature meets the standards.
3. Report Generation: Generate an oven temperature test report based on the data analysis results. The report should include the test time, test equipment, test point positions, oven temperature curve, analysis conclusions, etc., and archive the report for future reference.

7. Equipment Maintenance and Care

1. Cleaning: After each test, wipe the oven temperature tester and temperature sensor with a clean soft cloth to remove dust, oil, and other impurities on the surface. For stubborn stains, an appropriate amount of alcohol can be used for cleaning, but care should be taken to prevent alcohol from entering the interior of the equipment.
2. Storage: Store the oven temperature tester in a dry, well-ventilated environment free of corrosive gases, and avoid direct sunlight. When not in use for a long time, conduct regular power-on inspections on the equipment to ensure normal performance.
3. Calibration: Calibrate the oven temperature tester regularly in accordance with the equipment calibration cycle requirements. Calibration work should be carried out by professionals or qualified calibration institutions to ensure the accuracy of test data.

8. Precautions

1. Safety Protection: Operators must wear protective equipment such as high-temperature gloves and goggles when conducting oven temperature tests to avoid scalding and other accidental injuries.
2. High-Temperature Environment: During the operation of the test equipment, the surface temperature of the oven body is relatively high. Do not touch the oven body to prevent scalding. At the same time, ensure good ventilation at the test site to avoid discomfort to operators caused by the high-temperature environment.
3. Equipment Malfunctions: If malfunctions are found in the oven temperature tester or test equipment during the test, stop the test immediately and contact equipment maintenance personnel for handling. Do not disassemble or repair the equipment without authorization.

Detailed Description of Oven Temperature Tester Function Test Steps

1. Preliminary Preparation

1. Confirm the equipment status: Take the oven temperature tester out of the storage environment, place it in an environment with normal temperature (20-25℃), no dust, and no electromagnetic interference, and let it stand for 30 minutes to avoid the impact of environmental temperature differences on the test results.
2. Prepare tools and materials: Prepare the supporting original data transmission cable, standard thermometer for calibration (accuracy ±0.1℃), spare sensors, computer (installed with the latest version of the equipment's supporting analysis software), and test record form.
3. Check the power supply: If the equipment is rechargeable, first charge it fully with the original charger; if it is external power supply type, confirm that the output voltage and current of the power adapter are consistent with the equipment's markings to avoid damage to the equipment due to unstable voltage.

2. Basic Function Test

1. Power-on and Interface Test
   • Press and hold the equipment's power button for 3-5 seconds, observe whether the equipment turns on normally. After power-on, check if the interface is fully displayed (no missing screen or garbled screen), and whether each function icon (such as "Test", "Settings", "Storage") is clearly recognizable.
   • Press the "up, down, left, right" navigation keys and "Confirm" and "Return" keys on the equipment to test whether the keys are sensitive, without stuck or false triggers, and whether the interface switches smoothly.
2. Parameter Setting and Reset Test
   • Enter the "Settings" menu, try to modify the "sampling frequency" (e.g., from 1 time/second to 2 times/second), "test duration" (e.g., set to 10 minutes), and "temperature unit" (switch between ℃/℉) in sequence. After modification, press "Confirm" to save, check if the parameters can be saved normally, and whether the display is consistent with the settings when entering the menu again.
   • Find the "Restore Factory Settings" option (some equipment requires a password, which can be found in the equipment manual), perform the reset operation, and confirm whether the equipment parameters are restored to the initial default values (such as sampling frequency 1 time/second, temperature unit ℃) after reset.
3. Alarm Function Test
   • Enter the "Alarm Settings" menu, set a "low-temperature alarm threshold" lower than the current ambient temperature (e.g., if the current ambient temperature is 25℃, set the threshold to 20℃), and observe whether the equipment triggers a low-temperature alarm (such as a buzzer sounding, red alarm icon flashing on the screen) within 10 seconds;
   • Similarly, set a "high-temperature alarm threshold" higher than the current ambient temperature (e.g., set to 30℃), hold the equipment's temperature detection module (not the sensor interface) with your hand to simulate temperature rise, confirm whether the equipment triggers a high-temperature alarm, and press the "Cancel" key after the alarm to check if the alarm can be released normally.

3. Sensor Function Test

1. Sensor Connection Test
   • Align the plug of the original sensor with the equipment's sensor interface, insert it gently and tighten it (fasten it if it is a buckle type), and observe whether the equipment interface immediately displays a "sensor connected" prompt (e.g., the interface displays "CH1 Connected", where CH is the channel number), with no connection failure or flickering disconnection.
   • Replace the spare sensor and repeat the above operation. Confirm that all sensor channels (e.g., 4 channels if the equipment has 4) can normally recognize the sensor to eliminate poor interface contact or channel failure.
2. Sensor Data Accuracy Test
   • Attach the probe of the standard thermometer and the sensor to be tested closely together, put them into a constant temperature box (or a thermos cup filled with warm water, with the water temperature controlled at 50-60℃ to avoid damaging the sensor), and keep it for 5 minutes to stabilize the temperature;
   • Observe the temperature value displayed by the oven temperature tester, compare it with the reading of the standard thermometer. The error should be within the range specified in the equipment manual (usually ±0.5℃). If the error exceeds the range, mark the sensor for calibration.

4. Data Storage and Transmission Test

1. Data Storage Test
   • Enter the "Test" menu, start a simulation test (no need to put it into the oven, only collect the current ambient temperature), set the test duration to 1 minute and the sampling frequency to 1 time/second;
   • After the test is completed, enter the "Storage" menu, check whether a new test data file is generated, and whether the file name and generation time are consistent with the test time, to confirm that the data storage function is normal.
2. Data Transmission Test
   • Connect the oven temperature tester to the computer using a data transmission cable, open the supporting analysis software, and select "Connect Device" in the software;
   • After successful connection, select "Read Data" in the software to read the simulated test data just stored into the computer. Check whether the read data is complete (e.g., 60 data points should be included in a 1-minute test) and whether the data curve is consistent with the one displayed on the equipment interface;
   • Try to modify the data file name in the software and save it to the specified path on the computer. Confirm that the data can be saved normally without loss or garbled characters.

5. Calibration Verification (Key Step)

1. Enter Calibration Mode
   • Follow the instructions in the equipment manual to enter the "Calibration Mode" (some equipment requires a professional password to avoid unauthorized operation), and select "Single-Point Calibration" or "Multi-Point Calibration" (multi-point calibration is recommended to cover the commonly used test temperature range, such as 25℃, 100℃, 200℃, 300℃).
2. Multi-Point Calibration Operation
   • Put the sensor and the standard thermometer probe into the constant temperature box, set the temperature of the constant temperature box to 25℃, 100℃, 200℃, and 300℃ in sequence. After each temperature point stabilizes for 10 minutes, record the displayed value of the oven temperature tester and the reading of the standard thermometer;
   • Enter the standard value of the corresponding temperature point in the equipment calibration interface. The equipment automatically calculates and saves the calibration coefficient. Restart the equipment after calibration is completed.
3. Post-Calibration Retest
   • After restarting the equipment, put the sensor and the standard thermometer into the constant temperature box again (select any calibrated temperature point, such as 150℃). After stabilization, compare the readings of the two. The error should be ≤±0.3℃ to confirm the effectiveness of the calibration.

6. Test Result Recording and Handling

1. Fill in the "Oven Temperature Tester Function Test Record Form", recording the test date, equipment number, test steps, test results (normal/abnormal), and description of abnormal conditions (such as excessive error of a certain sensor, unrecognizable certain channel).
2. If abnormalities are found during the test (such as unresponsive buttons, excessive sensor error, data transmission failure), stop using the equipment immediately, attach a "To Be Repaired" label, and contact the equipment supplier or professional maintenance personnel for handling. After maintenance, the full set of function tests must be re-conducted, and the equipment can be put into use only after passing the tests.