Kako to uporaba a digitalna multimeter do merila kakovost polprevodni releji v the following way
Solid state relay is referred do as SSR. It is a new type of non-contact switch composed of electronic components. It has the značilnosti of zanesljivost operation, fast switching speed and long life. It can replace konvencionalni releji in krmilni krmilni vezji.
Dva terminala od VHOD sta vhod terminali, povezava nadzor signali, in druga dva terminala sta sta izhod terminali, priključeni releji lahko be razdeljeni v DC in AC polprevodniški releji v skladu do obremenitev tip. The prejšnja uporaba moč tranzistorji as preklapljanje elementi, in the slednje uporabe triaki as preklapljanje elementi.
Načelo AC ničelni prehod trdno stanje rele. The timen ničelni prehod pomeni to to tiristor is sproženo kdaj the AC napetost is nično ali pravično križa nično, ki lahko zmanjša the impact on the power supply kdaj tiristor is vklopljeno vklopljeno. Splošno, the ničelno križanje napetost is definirano kot ±25V. V In to območje, as long as the vhod signal is dodano, the SSR bo bo vklopljeno vklopljeno. Kdaj the moč napajanje napetost is večje kot ±25V, the SSR bo ne ne vklopljeno takoj kdaj the vhod signal is dodano. It bo samo počakaj do napajanje napajanje pade do the next crossing napetost. The SSR is only vklopljeno kdaj je v v the ničelno območje.
Kdaj zaznavanje the SSR, you lahko ukrep w there is DC napetost at at the vhod konec. The prisotnost of DC napetost kaže to to the vhod signal is normal, in tedaj ukrep whether there is AC napetost at at the izhod konec. If there is, it pomeni the SSR is normal. If there is none or the napetost drop is zelo low, it pomeni the solid state rele is poškodovan.
Use the diode setting of the digital multimeter to perform forward and reverse measurements on ①, ②, ③, and ④. According to the test data, when the red test lead is connected to pin ① and the black test lead is connected to pin ②, the meter displays a value of 1381 (1.381V). Exchange the test leads. During measurement, the meter displays the overflow symbol "1"; when the red test lead is connected to pin ④ and the black test lead is connected to pin ③, the meter displays a value of 543 (0.543V). When the test leads are exchanged for measurement, the meter displays the overflow symbol "1"; in the remaining In several test states, the instrument displays the overflow symbol "1". It is not difficult to draw the conclusion from this: ① and ② pins are the DC input terminals of the device under test, ① pin is the positive pole, ② pin is the negative pole, "1.381V" is the forward voltage drop of the light-emitting diode inside the solid-state relay; ③, ④ pins is the DC output terminal, pin ③ is the positive pole, pin ④ is the negative pole, "0.543V" is the forward voltage drop of the protection diode connected in parallel to the output terminal of the solid-state relay. Note that for solid-state relays without protection diodes at the output end, no matter how the test leads are exchanged to measure the ③ and ④ pins, the meter will display the overflow symbol "1". When using different types of digital multimeters to measure the internal light-emitting diodes of solid-state relays, the display value of some meters sometimes only flashes the reading momentarily, and then displays the overflow symbol "1". In this case, you can repeatedly exchange the test leads and test several times until the Draw test conclusions
