The difference between a digital multimeter and a pointer multimeter, which one is better to use?
1, the display mode each has its own strengths: many people see the digital multimeter, the first reaction is what? Definitely think, wow, this multimeter is good, the amount can be directly with the digital display, do not need me to read, how convenient! Well, this sentence was heard by the electrician who likes to use the pointer multimeter, he retorted. Pointer table is the biggest advantage of its pointer swing, which can be very intuitive to mention the properties of the measured object changes, but more convenient than the digital table Oh.
From this point of view, it can be said that it is difficult to distinguish between them. However, the digital table also has a more prominent features, that in general can be made very small and portable, which is slightly better than the pointer table. As for the backlight problem, I think some of the better amount of pointer table is also there, this does not count.
2, the design of the use of some differences: usually, we subconsciously feel that the digital multimeter is suitable for measuring precision instrumentation devices from the tool, small overloads such as the use of the accuracy of the relative pointer multimeter will be relatively intuitive, accurate some. And the pointer multimeter people feel suitable for measuring large overload (this and the working principle of the pointer also has some relation to it). So it also depends on the nature of the electrician's work, how the multimeter is commonly used to measure things. As for the problem of drop resistance, I personally feel that the digital meter is slightly better, after all, the oscillating pointer is a precise and flexible physical device.
Pointer multimeter and digital multimeter selection:
1, the pointer multimeter is a kind of average value type instrument. It has intuitive. Image of the reading instructions. (General readings are closely related to the pointer swing angle, so it is very intuitive).
Digital multimeter is an instantaneous style instrument. It uses 0.3 seconds to take a sample to display the measurement results. Sometimes each sampling results are only very similar. Not exactly the same. This is not as convenient to read the results as the pointer type.
2, pointer multimeter generally no internal amplifier. So the internal resistance is small. For example, MF-10 type, DC voltage sensitivity of 100 kΩ / volts. MF-500 DC voltage sensitivity of 20 kilohm/volt.
Digital multimeter due to the internal use of op amp circuit. Internal resistance can be made very large. Often in 1M ohms or greater. (That is, you can get a higher sensitivity). This allows for a much smaller effect on the circuit under test. Measurement accuracy is higher.
