Digital Multimeter Resolution Description
Resolution is how well a meter measures. By knowing the resolution of a meter, you can tell if you can see small changes in the signal being measured. For example, if a digital multi-meter has a resolution of 1mV over a 4V range, then you can see small changes of 1mV (1/1000 of a volt) when measuring a 1V signal!
If you were measuring a length of less than 1/4 inch (or 1 mm), you certainly wouldn't use a ruler with a minimum unit of inches (or centimetres). If the temperature is 98.6°F, it's useless to measure it with a thermometer that has only integer markings. You need a thermometer with a resolution of 0.1°F.
The digits and words are used to describe the resolution of the meter. Digital multi-meters are categorised by the number of bits and words they can display.
A 3½-digit meter can display three full numeric digits from 0 to 9, and one half-digit (only 1 or no display). A 3½-digit meter can achieve a resolution of 1999 words. A 4½-digit digital table can achieve a resolution of 19,999 words.
Describing the resolution of a digital table in words is better than describing it in bits, and the resolution of a 3½-bit digital table has been increased to 3200 or 4000 words.
A 3200-word digital table provides better resolution for some measurements. For example, with a 1999-word meter, you cannot display to 0.1 V when measuring voltages greater than 200 V. A 3200-word digital meter can still display to 0.1 V when measuring voltages of 320 V. When the measured voltage is higher than 320 V and you want to achieve a resolution of 0.1 V, you have to use the more expensive 20,000-word digital meter.
How to use a digital multimeter to detect the capacitance, diode good or bad ah
Fuse: the multimeter will be played to the diode file (also known as the beeping file), the red pen and the black pen connected to the ends of the fuse, the on-resistance value of 0 ohms, there will be a beeping sound, otherwise the fuse burned out;
Capacitor: first of all, the red pen short capacitor ends, the multimeter will be played to the diode file, and then use the red pen and black pen were connected to the pins, if the display resistance will continue to improve until the display is 1 (infinity), capacitance quality is good. If the beginning of the display of the resistance value of 0 or increase to a certain value does not move, indicating that the capacitor internal open circuit or breakdown. If the resistance value quickly to infinity, that the capacitor has leakage;
Diode: according to the principle of diode forward conduction, the direction of the cut-off, with a red pen and black pen to measure its forward resistance and reverse resistance, such as a group of data measured as infinity or resistance value is relatively large, the other group of resistance value is small, it is indicated that the diode is normal.
