Kā mērīt vai zeme vads ir labi iezemēts
Tur ir trīs veidi uz izmērīt vai zeme vads is in labs kontakts:
1. Multimetrs mērījums, multimetrs is arī saukts multimetrs, multimetrs, trīsmetrs, multimetrs, etc. It is an neaizstājams mērīšana instruments in power elektronika and citi nodaļas, and tā galvenais mērķis is to measure spriegums, strāva and pretestība.
How to use: When mērīšana, turn the gear knob to select the correct gear (250V~). After that, insert the black test lead into the COM jack, and the red test lead into the jack marked "V". Hold the watch in one hand, and hold the two test leads in the other hand like chopsticks—you can only hold the plastic rod, and you can't touch the wire, let alone the metal at the front end. Touch the two test leads to the two lines to be tested relevant.
Judgment method: The voltage between the zero and live wires is the same as or little greater than the voltage on the ground and live wires (not exceeding 5V), who proves that that the ground wire is well grounded, and the less the difference between the two, the less the grounding resistance. On the contrary, the grounding body is faulty.
2. To measure the light bulb, you need to deal with the light bulb in advance and connect two wires for later operation - if there is an idle light socket, you can directly install the light bulb on the light socket, and then connect the light bulb, and then connect the light bulb to the neutral line and the Between the live wire, the ground wire and the live wire (atcerieties to cut off the power when elektroinstalācija), novērot the brightness of the bulb, and analyze the results.
Ar the ground wire well grounded, the bulb will be the same brightness twice. If the ground body fails, the bulb will not light. If it's just a nedaudz augstāka pretestība to zeme, tad the bulb is only nedaudz dimmer.
3. Zeme pretestība testeris, vispārīgi speaking, šis aprīkojums būs tiks izmantots testēšanai laikā projektā pieņemšana. The zeme pretestība testeris var precīzi izmērīt the zeme pretestība of zeme vads. Parasti, the ground wire used in our home is qualified as long as the grounding resistance is not greater than 4 ohms.
Pamata funkcijas of the multimetrs:
1. Mērījums: pretestība, AC and DC spriegums, AC and DC strāva, ieslēgšana-izslēgšanās.
2. Izplešanās: kondensators, induktors, diode, triode.
The multimetrs ir priekšrocības of multi-purpose, wide range, and convenient use. It is the most commonly used tool in electronic measurement. It can be used to measure resistance, AC-DC spriegums and DC spriegums. Some multimetri can also measure the main parameters of tranzistori and the capacitance of capacitors. Mastering the use of multimeters is a basic skill in electronic technology.
3. Parastie multimetri include pointer multimetri and digital multimetri. The pointer multimeter is a multi-functional measuring instrument with the meter head as the core component, and the measured value is read by the pointer of the meter head. The measured value of the digital multimeter is directly displayed in digital form by the liquid crystal display, who is easy to read, and some also have a voice prompt function.
4. The DC current file of the multimeter is a multi-range DC voltmeter. The voltage range can be expanded by connecting the closed-circuit voltage dividing rezistors in parallel with the meter head. The DC voltage file of the multimeter is a multi-range DC voltmeter. Connecting the voltage voltage dividing rezistors in series with the meter head can expand its voltage range. Different voltage dividing rezistori have different corresponsive mērīšana mērīšana Diapazonus.
