To begin, turn on the digital multimeter and choose a tag and test Brisbane objects, such as voltage, current, resistance, or something else. Second, determine the range; if we are doubtful about the range, we can put it to maximum and then progressively reduce it. Before we begin testing, we should double-check that the meter pen is inserted into the correct hole. The force with which we toggle the range switch should be appropriate to avoid damaging the metal switch. The rotary switch should be in the high voltage profile after testing.
During the testing of digital multimeters, below are some explanations:
(1) For the high impedance profile, the resistance test results differ from the pointer table test findings. Because of the test conditions, there is a minor discrepancy.
(2) When evaluating a physical quantity that is related to polarity, the metre pen's polarity should be matched. That is to say, when the polarity is not displayed, the point of the red metre pen indicates that the potential is in the high-end or the side into which the current is flowing. When the polarity is "−," the red metre pen's point is in the low-end potential or the current outside.
3) The resistance and diode profiles are not the same as the pointer metre pen. When using a pointer metre pen to test resistance, the red and black pens are in the opposite polarity, that is, black represents the positive electrode and red represents the negative electrode. The polarity of a digital multimeter, on the other hand, is identical to that of a test source. The positive electrode is represented by a red pen, whereas the negative electrode is represented by a black pen. The same is true for voltage and current. It will not be misunderstood. As a result, it outperforms the pointer metre.
(4) When the polarity or pin order of a transistor is unknown, the profile of the transistor can be used to detect and confirm each polarity.
(5) Checking the calibration
The calibration of a digital multimeter should be done on a regular basis. When calibrating it, we should use a digital metre that is similar or has greater accuracy. The following is the calibrated order: The first is a DC profile; the second is an AC profile, and the third is a capacitance profile.
A 9V laminated battery is used in most digital multimeters, and it is usually used for a few months. To have a backup, I recommend purchasing a 9V rechargeable battery. As a result, it can help you save money.