1. The pointer table has poor reading accuracy, but the process of pointer swing is relatively intuitive, and the amplitude of the swing speed can sometimes objectively reflect the measured size (such as measuring the slight difference of the TV data bus (SDL) when transmitting data. Jitter); the digital multimeter reads intuitively, but the process of digital changes looks messy and not easy to watch.
2. There are generally two batteries in the pointer table, one low voltage 1.5V, one high voltage 9V or 15V, and the black test pen is the positive end relative to the red test pen. Digital multimeters often use a 6V or 9V battery. In the resistance file, the output current of the meter in the pointer table is much larger than that of the digital meter. With the R&TImes; 1 Ω file, the speaker can make a loud “beep†sound, and even the light-emitting diode (LED) can be illuminated with the R&TImes; 10kΩ file.
3. In the voltage file, the internal resistance of the pointer table is relatively small compared to the digital multimeter, and the accuracy of the measuring instrument is relatively poor. Some high-voltage micro-currents can't even be measured because their internal resistance will affect the circuit under test (for example, the measured value will be much lower than the actual value when measuring the acceleration stage voltage of the TV picture tube). The internal resistance of the digital multimeter voltage file is very large, at least in the megaohm range, and has little effect on the circuit under test. However, the extremely high output impedance makes it susceptible to induced voltage, and the data measured in some cases where electromagnetic interference is relatively strong may be virtual.
4. In short, the pointer table is used in the analog circuit measurement of relatively high current and high voltage, such as TV set and audio power amplifier. Digital meters, such as BP machines, mobile phones, etc., are used in the measurement of digital circuits with low voltage and low current. Not absolute, the pointer table and digital multimeter can be selected according to the situation.
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