Ungafunda kanjani isilinganiso se-multimeter ye-CAT: ukuqonda nokusebenzisa ukuhlolwa kwe-voltage ephezulu

Okuqukethwe

Siyini isilinganiso se-CAT se-multimeter?
Izigaba ezahlukene nezincazelo zazo
Isebenza kanjani i-CAT multimeter rating system
Isibonelo sokusebenzisa uhlelo lwe-CAT multimeter rating

Ama-multimeters nezinye izinto zokuhlola zikagesi zivame ukunikezwa isilinganiso sesigaba. Lokhu okokunikeza umsebenzisi umbono we-voltage ephezulu idivayisi engayikala ngokuphephile. Lezi zilinganiso zethulwa njenge-CAT I, CAT II, CAT III, noma CAT IV. Isilinganiso ngasinye sibonisa amandla kagesi aphephile ongalinganiswa.

Siyini isilinganiso se-CAT se-multimeter?

I-Category Rating (CAT) iwuhlelo olusetshenziswa abakhiqizi ukuze banqume izinga lokuvikela elinikezwa izinto zikagesi lapho kulinganiswa i-voltage. Izilinganiso zisukela ku-CAT I kuye ku-CAT IV kuye ngohlobo lwamandla kagesi akalwayo.

Kufanele ngisebenzise nini imitha yesigaba esihlukile? Impendulo incike emsebenzini owenziwayo.

Ama-Multimeters avame ukusetshenziswa kuma-mains kanye nezicelo ze-voltage ephansi. Isibonelo, ukukala i-outlet noma ukuhlola isibani. Kulezi zimo, amamitha e-CAT I noma e-CAT II cishe azokwanela. Kodwa-ke, lapho usebenza ezindaweni eziphezulu zamandla kagesi, njengephaneli ye-circuit breaker, ungase udinge ukuvikeleka okwengeziwe kokuhlinzwa kunalokho okungahlinzekwa imitha evamile. Lapha ungacabangela ukusebenzisa i-multimeter entsha, enesilinganiso esiphezulu.

Izigaba ezahlukene nezincazelo zazo

Uma uzama ukukala umthwalo, kunamaleveli angu-4 amukelekile okulinganisa.

CAT I: Lokhu kuvamise ukusetshenziswa kumasekhethi okulinganisa amamitha axhunywe ngokuqondile ohlelweni lwezintambo zikagesi zesakhiwo. Izibonelo zihlanganisa izingxenye ezingathwali zamanje njengamalambu, amaswishi, ama-circuit breaker, njll. Ukushaqeka kukagesi akunakwenzeka noma akunakwenzeka ngaphansi kwezimo ezinjalo.

INCWADI YESI-XNUMX: Lesi sigaba sisetshenziswa ezindaweni lapho ama-transient angaphezulu kancane kwe-voltage evamile. Izibonelo zifaka amasokhethi, amaswishi, amabhokisi okuhlanganayo, njll. Ukushaqeka kukagesi akunakwenzeka noma akunakwenzeka ukuthi kwenzeke kulezi zindawo.

I-CAT III: Lesi sigaba sisetshenziselwa izilinganiso ezithathwe eduze komthombo wamandla, njengamaphaneli ezinsiza kanye namabhodi okushintsha izakhiwo noma izakhiwo zezimboni. Ukushaqeka kukagesi mancane kakhulu amathuba okuba ngaphansi kwalezi zimo. Kodwa-ke, zingenzeka ngamathuba aphansi ngenxa yokungasebenzi kahle. (1)

Isigaba IV: Amathuluzi afakwe kulesi sigaba asetshenziswa ohlangothini oluyinhloko lwe-transformer ehlukanisiwe ene-insulation eqinisiwe kanye nezilinganiso zezintambo zikagesi ezibekwe ngaphandle kwezakhiwo (imigqa ephezulu, izintambo).

I-International Electrotechnical Commission (IEC) ithuthukise amazinga amane wamandla kagesi namandla kazibuthe anezincomo zokuhlolwa kwesikhashana kwelinye ngalinye.

Izici	CAT I	CAT II	I-CAT III	INCWADI XNUMX
I-voltage yokusebenza	150V	150V	150V	150V
300V	300V	300V	300V
600V	600V	600V	600V
1000V	1000V	1000V	1000V
I-voltage yesikhashana	800V	1500V	2500V	4000V
1500V	2500V	4000V	6000V
2500V	4000V	6000V	8000V
4000V	6000V	8000V	12000V
Umthombo wokuhlola (impedance)	30 ohm	12 ohm	2 ohm	2 ohm
30 ohm	12 ohm	2 ohm	2 ohm
30 ohm	12 ohm	2 ohm	2 ohm
30 ohm	12 ohm	2 ohm	2 ohm
Ukusebenza kwamanje	5A	12.5A	75A	75A
10A	25A	150A	150A
20A	50A	300A	300A
33.3A	83.3A	500A	500A
Okwesikhashana	26.6A	125A	1250A	2000A
50A	208.3A	2000A	3000A
83.3A	333.3A	3000A	4000A
133.3A	500A	4000A	6000A

Isebenza kanjani i-CAT multimeter rating system

Ama-multimeter asetshenziswa kakhulu emakethe awela ezigabeni ezimbili: i-CAT I ne-CAT III. I-multimeter ye-CAT I isetshenziselwa ukukala i-voltage efika ku-600V, kuyilapho i-multimeter ye-CAT III isetshenziswa kufika ku-1000V. Noma yini engenhla edinga ibanga eliphakeme nakakhulu, njenge-CAT II ne-IV, eyenzelwe u-10,000V no-20,000V ngokulandelanayo.

Isibonelo sokusebenzisa uhlelo lwe-CAT multimeter rating

Zicabange ubheka iphaneli kagesi yendlu yakho. Udinga ukuhlola izintambo ezimbalwa. Izintambo zixhunywe ngqo kulayini wamandla amakhulu (240 Volts). Ukubathinta ngephutha kungaphumela ekulimaleni okubi kakhulu noma ukufa. Ukuze uthathe izilinganiso ngokuphepha kulesi simo, uzodinga i-multimeter yebanga eliphezulu (i-CAT II noma engcono) ezokuvikela wena nezinto zokusebenza emonakalweni odalwe amazinga aphezulu wamandla. (2)

Bheka ezinye zezihloko zethu ngezansi.