Selecting a Multifunctional Multimeter as Needed and Its Operating Principles
In daily life, do people have many questions about choosing a multimeter? I believe everyone has referenced information online. There are many methods, but in daily life, we only consider the factors of the instrument itself, such as display bit number and accuracy, measurement method and AC frequency response, function and measurement range, stability and safety, etc., often neglecting our own needs. Next, the editor will explain this point:
Currently, many multimeters have added the following more practical functions:
(1) Temperature measurement
During electronic maintenance, checking the heat generation of electronic components, such as measuring the temperature when soldering and removing components, can prevent damage to the components.
(2) Simultaneously measure both AC and DC components
If the signal encountered is not a pure AC or DC signal, it is necessary to observe the total true effective value of the waveform (including both AC and DC parts) in order to analyze the power consumption of the circuit and check for damaged components.
(3) DBm and millivolt measurement
The so-called dBm value measurement refers to low-level measurement followed by dB value measurement. DB - generally expressed using the formula dB=201oGU. If the reference voltage is changed, relative values can be measured through testing and comparison, which can be used to analyze the voltage increase of the voltage amplifier.
(4) Peak Maintenance
By using a multimeter to measure the true effective value, this function can measure the instantaneous peak voltage of irregular AC signals with a width greater than 0.25 ms and automatically maintain it, which is beneficial for finding the cause of component and equipment damage.
(5) △ Relative value determination
By using this function, relative value measurement can be performed, that is, the difference between the test voltage or current and the reference voltage or current. The relative magnitude of the voltage can eliminate the influence of stray capacitance in the reading.
The editor believes that when choosing a multimeter, it is necessary to select it according to one's actual work needs, meet the requirements of the measured object, and maintain a certain degree of accuracy in the measurement results. Otherwise, due to improper selection, the measurement results may be inaccurate and cause unnecessary trouble.
