Selection and usage skills of digital multimeter and pointer multimeter
1. Is a digital multimeter superior than an analog one? Solution: Due to its high accuracy and sensitivity, quick measurement speed, numerous features, small size, high input impedance, simple observation, and potent communication functions, the digital multimeter is easily accessible. application. The replacement of analog pointer watches is common. But occasionally, such as when there is very severe electromagnetic interference, the data measured by the digital multimeter may differ significantly because of the device's extremely high input impedance and susceptibility to the effects of generated potential.
2. It is believed that during maintenance, troubleshooting may have damaged the circuit's diode or triode. The reverse direction is unlimited, but the conduction voltage is approximately 0.6V as measured with the digital meter's diode file. After inspecting the circuit once more, there is no issue and no flaw has been discovered. Why? Solution: Most digital meters' diode files send test voltages of roughly 3-4.5V. It is impossible to determine at low voltage if the tested transistor has a minor leakage or if the characteristic curve has changed.Right now, a 10K resistance file and an analog meter are required. This file generates a 10V or 15V test voltage. It will be discovered that the suspected transistor has leaking in the other direction at this test voltage. Analog meters can also quickly destroy sensitive components when used to measure the resistance of some precision sensitive components with very low withstand voltage. It is required to measure right now using a digital meter.
3. Measure the high-voltage probe's attenuated voltage value using a multimeter. The DCV test proves to be more precise, although the ACV error is significant. Even with a high-precision multimeter, this is still the case. What's the cause? The majority of multimeters detect voltage using parallel connections. The voltmeter itself serves as the input impedance for the entire test circuit and is equivalent to a load. The less impact on the circuit being tested, and the more precise the test will be, the higher the load impedance. However, nothing is perfect, and excessive impedance will reduce the test's bandwidth.The voltage at terminal 2 of the high-impedance load will be significantly impacted by the input impedance of the multimeter, which is currently available and has a frequency response of about 100KHz. This input impedance is approximately 1.1M. For instance, the high-voltage probe itself has a very high resistance. Pick a multimeter with a high internal resistance at this time. For instance, while testing ACV, the 170/172/176/178/179 handheld digital multimeter offers an input impedance up to 10,000, allowing for the avoidance of this issue.
4. I want to measure the voltage, current, motor winding impedance, etc., as well as the speed during the actual test. Does this function exist in any multimeters? Solution: The hand-held digital multimeter can satisfy the criteria you've listed above, and it's safe. You can use it with confidence even in these three different environments because the regulations comply with IEC1010-1 CATII 1000V and CATIII 600V standards set by the International Electrotechnical Commission.
