How to Use a Multimeter to Continuously Record Intermittent Faults
Some multimeters not only have the function of recording minimum/maximum/average values, but also combine this function with another function called AutoHOLD and larger memory, forming the power of Event Logging. Automatic maintenance can sense when the measurement signal becomes unstable and when it stabilizes again. By using the auto hold function to trigger the start and stop of the minimum/maximum value recording function, the digital multimeter is not limited to detecting faults that generate minimum or maximum values.
If the multimeter has an infrared RS232 interface, the continuous recording function will be more powerful, and it can become a simple event collector to transmit the data collected by the multimeter to a computer. By using computers, detailed analysis can be conducted on every stable and unstable event. You can not only view the minimum and maximum values during each stable and unstable cycle, but also the start and end times of each cycle. Additionally, record the average value for each cycle. At the same time, it can dynamically detect the trend of voltage or current changes.
Comparison of measurement range of digital multimeter in AC/DC voltage range
There are many functions of a multimeter, and the functions of various models of multimeters are not the same, but they all include basic functions: measuring DC current, measuring DC voltage, measuring AC voltage, and measuring resistance. Many multimeters have the following derived functions: measuring audio level, measuring capacitance, measuring inductance, measuring capacitance, measuring inductance, measuring transistor amplification, etc. Today, taking DT890B as an example, let's explain the measurement range of DC/AC voltage range:
