How to determine the general capacitance with a digital multimeter
1,Estimating the size of microwave capacitance: it can be determined by experience or by referring to the standard capacitance of the same capacity, according to the maximum magnitude of the pointer swing.
2,Estimating the size of the capacitance of the Pi method level capacitor capacity: to use R × 10kΩ file, but can only be measured to more than 1000pF of capacitance. For 1000pF or slightly larger capacitance, as long as the needle slightly swing, you can think that the capacity is enough.
3, test capacitance leakage: more than one thousand microfarads of capacitance, you can first use R × 10Ω file will be quickly charged, and preliminary estimates of capacitance, and then changed to R × 1kΩ file continue to measure a while, then the pointer should not return, and should stop at or very close to ∞, otherwise there is a leakage phenomenon.
4, the function switch to 20uF or 200uF file, the pen in the middle of the two holes, the pen were to measure the capacitor poles, which will show its capacity. If the capacitor is used, it must be discharged before measurement.
Digital multimeter resolution:
Resolution is how good or bad a meter's measurements are. Knowing the resolution of a piece of meter, you can know if you can see small changes in the measured signal. For example, if a digital multimeter 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.
