Kynning á bendi margmæli
⒈ The reading accuracy of the pointer table is poor, but the process of the pointer swing is relatively intuitive, and its swing speed can sometimes reflect the measured size objectively (for example, the slight jitter of the TV data bus (SDL) when transmitting data) ); the reading of the digital meter is intuitive, but the process of digital change looks messy and not easy to watch.
⒉ There are generally two batteries in the pointer watch, one is low voltage 1.5V, and the other is high voltage 9V or 15V. The black test pen is the positive end of the red test pen. Digital meters usually use a 6V or 9V battery. In the case of electrical blockage, the output current of the test pen of the analog watch is much larger than that of the digital meter. Using the R1Ω file can make the speaker emit a loud "click" sound, and the R10kΩ file can even light up the light-emitting diode (LED).
⒊In the voltage block, the internal resistance of the pointer meter is relatively small compared to the digital meter, and the measurement accuracy is relatively poor. Some high-voltage and micro-current situations cannot even be measured accurately, because the internal resistance will affect the circuit under test (for example, when measuring the acceleration stage voltage of a TV picture tube, the measured value will be much lower than the actual value). The internal resistance of the digital meter voltage block is very large, at least in the megohm level, and has little impact on the circuit under test. However, the extremely high output impedance makes it susceptible to induced voltage, and the measured data may be false in some occasions with strong electromagnetic interference.
