Darbs princips un klasifikācija of skava pulksteņi
A skava ampērmetrs, arī zināms as a skava ampērmetrs, is an instruments kas apvieno a strāva transformators un an ampērmetrs. Tā darba princips ir tas pats as mērīšana strāva ar a strāva transformators. Darba daļa galvenokārt sastāv of an elektromagnētiskais ampērmetrs un a caur kodols strāva transformators. Dzelzs kodols of the caur kodols strāva transformators is made into a kustams atvere un veidots iekšā a skava forma, no tā the name skava ampērmetrs. It is a portatīvais instruments tas var tieši izmērīt the AC strāva of a ķēde bez atvienošanas the circuit. It is very convenient to use in electrical maintenance and is wide used.
Darba princips of skava pulkstenis
The working principle of a clamp type meter is the same as that of a transformer. The primary coil is a wire that passes through a clamp type iron core, equivalent to the primary coil of a 1-turn transformer, which is a step-up transformer. The secondary coil and the ammeter used for measurement form the secondary circuit. When there is alternating current passing through the wire, it is this turn of coil that generates an alternating magnetic field, causing induced current in the secondary circuit. The magnitude of the current and the proportion of the primary current are equivalent to the inverse ratio of the turns of the primary and secondary coils. A clamp type ammeter is used to measure large currents. If the current is not high enough, the number of turns of a wire passing through the clamp type ammeter can be increased, and the measured current can be divided by the number of turns. The secondary winding of the through core current transformer of the clamp type ammeter is wound around the iron core and connected to the AC ammeter. Its primary winding is the measured wire passing through the center of the transformer. The knob is actually a range selection switch, and the function of the wrench is to open and close the movable part of the core of the through core transformer, in order to clamp it onto the measured wire. When measuring current, press the wrench, open the clamp, and place the measured current carrying wire in the middle of the through core current transformer. When there is alternating current passing through the measured wire, the magnetic flux of the alternating current induces a current in the secondary winding of the transformer. This current passes through the coil of the electromagnetic ammeter, causing the pointer to deflect, and indicating the measured current value on the dial scale.
Pincer tabula klasifikācija
Saskaņā to tā struktūra un mērķis, it var būt sadalīts uz divi tipi: transformators tips un elektromagnētiskais tips. Parastais lietotais tips is a transformators skava ampērmetrs, kas sastāv no a strāva transformators un a taisngriezis instruments. It can only measure AC strāva. The novirze of the kustamā daļa of an elektromagnētiskais instruments is independent of the polarity of the current, so it can be use for both AC and DC Nolūkiem.
Funkcijas of skava formas pulkstenis
skava skaitītājs var būt mainīts uz dažādi diapazoni by pārslēgšana pārnesumi of the switch. Tomēr, it ir nav atļauts darboties ar jaudu kad pārslēgties pārnesumi. Precizitāte skava skava formas pulksteņi ir parasti ne augsts, parasti diapazons no no 2.5 līdz 5 līmeņiem. For ease of use, there are also conversion switches with different ranges in the meter for mērīšana different levels of current and voltage. Skava skaitītājs bija sākotnēji lietots lai mērītu maiņstrāva, bet tagad tas arī ir funkcijas tādas as mērīšana maiņstrāva un DC spriegums, strāva, kapacitāte, diode, tranzistors, pretestība, temperatūra, frekvence, un so on.
(1) Mehāniska nulle regulēšana is nepieciešams pirms mērījums
(2) Select the appropriate range, first select the large range, then select the small range or estimate the nameplate value.
(3) When using the minimum range measurement and the reading is not significant, the measured wire can be wound several turns, and the number of turns should be based on the number of turns in the center of the clamp, then the reading=the indicated value × Range/full deviation × Number of turns
(4) After measuring, place the transfer switch at the maximum range.
(5) Kad mērīšana, mērs vads vajadzētu jāliek iekšā centrā of skava un skava jābūt cieši aizvērts to samazināt kļūdas.
