As a precision surface resistance measuring instrument, TREK152-1's abnormal results are mainly caused by factors such as power supply, testing accessories, operating standards, and environment. The investigation should follow the logic of "from basic to complex". The following are specific points that can quickly locate and solve problems.

1. Check the basic status of power supply and instruments. Abnormal power supply is the primary troubleshooting item. If using a battery, it is necessary to ensure sufficient power. Low battery can easily cause reading drift. It is recommended to directly replace the battery with a new one for testing; When using an AC adapter, use a multimeter to check if the output voltage meets the instrument calibration requirements to avoid voltage instability causing malfunctions. At the same time, check the appearance of the instrument. If the display screen is garbled, it may be a fault with the motherboard MCU. You can try resetting it first. If it fails, you need to contact maintenance. In addition, a zeroing procedure needs to be performed before measurement, and the short-circuit input terminal completes the zeroing operation. If there is still a large zero point error after zeroing, it may be an internal operational amplifier fault.

2. Verify the integrity of test attachments. High insulation test cables and probes are high-risk areas for faults. First, check whether the dedicated triaxial cable is damaged or creased. Damaged shielding layers can seriously interfere with measurements. A multimeter can be used to detect whether the cable is short circuited or open circuited, or to replace it with a confirmed intact cable of the same model for comparative testing. In terms of the probe, clean the stains and oxide layer on its contact surface. If it is a concentric ring or point-to-point measurement, it is necessary to confirm that the probe is firmly connected to the cable and that the pressure sensing of the 5-pound probe is normal. Otherwise, the reading may be distorted due to poor contact.

3. Operating standards and calibration review.TREK152-1 Handheld Surface Resistance TesterImproper operation can easily cause measurement deviation, and it is necessary to check whether the measurement method matches the requirements. For example, when measuring with a heart ring probe, the reading needs to be multiplied by 10. Missing this step will result in abnormal results. When measuring, maintain a standard pressure of 5 pounds, as unstable pressure can cause fluctuations in the values. At the same time, check the calibration status of the instrument. If it is not calibrated within the time limit, the internal reference voltage is prone to drift and needs to be recalibrated according to the standard process. The accuracy of the instrument can be verified by measuring the known standard resistance.

4. Investigation of environmental interference factors. This instrument is sensitive to the environment, and priority should be given to confirming that the testing environment humidity is below 50% RH. High humidity can cause a surge in surface leakage current, and it can be moved to a dryer or dehumidified environment for retesting. Stay away from high-power electrical appliances and other electromagnetic interference sources to avoid electromagnetic fields affecting signal transmission. In addition, it is necessary to measure in a temperature stable environment, as severe temperature fluctuations can cause fluctuations in the performance of internal components. At the same time, avoid touching the metal part of the probe with your hands to prevent human static electricity from interfering with high resistance measurement results.

5. Hardware deep fault diagnosis. If the above investigation is ineffective, a preliminary judgment of hardware failure is required.TREK152-1 Handheld Surface Resistance TesterWhen the measurement value is 0 or severely biased, it may be due to the breakdown of the input protection diode; Displaying infinity may indicate an open circuit in the internal feedback resistor; If the reading continues to drift and there is no improvement after cleaning and wire replacement, it is highly likely that the internal amplifier module is faulty. Such problems should be stopped and professional personnel should be contacted for maintenance. Do not disassemble it yourself.