Dong Ho Van Nang Ky Thuat So La Gi? Cach Chon Mua 2026
Dong ho van nang ky thuat so (Digital Multimeter – DMM) la thiet do dien tu dung do cac thong so dien co ban: dien ap (Voltage), dong dien (Current), dien tro (Resistance), va nhieu thong so khac nhu tan so, dung luong tu, nhiet do. Day la cong cu khong the thieu cho ky thuat vien dien, dien tu, tho sua chua va sinh vien ky thuat.
Cac Thong So Quan Trong Khi Chon Dong Ho Van Nang So
| Thong so | Y nghia | Khuyen nghi |
|---|---|---|
| Dem (Counts) | Do phan giai hien thi | Moi nguoi nen chon 2000-6000 counts, ky thuat vien chuyen 6000-50000 counts |
| True RMS | Do chinh xac tin hieu khong sine | Nen mua True RMS de do chinh xac trong moi truong cong nghiep |
| CAT Rating | Muc do an toan | Toi thieu CAT III 600V, tot nhat CAT III 1000V hoac CAT IV |
| Auto Range | Tu dong chon thang do | Nen co, tien loi cho nguoi moi bat dau |
| Chuc nang NCV | Phat hien dien ap khong cham | Huu ich khi kiem tra dien tu xa |
Cac Loai Dong Ho Van Nang So Pho Bien
1. Dong ho van nang co ban (2000-4000 counts)
Phu hop cho nguoi moi hoc, thoat dien gia dinh. Thuong khong co True RMS, gia re ~100-200k. Vi du: DT830, DT9205.
2. Dong ho van nang trung cap (6000 counts, True RMS)
Phu hop cho ky thuat vien sua chua dien tu, dien lanh. Co True RMS de do chinh xac. Vi du: ZOYI ZT-101, ZT-102L, ZT-225.
3. Dong ho van nang cao cap (20000-50000 counts)
Phu hop cho ky thuat vien chuyen nghiep, phong thuc hanh. Co True RMS, giao dien Bluetooth, do chinh xac cao. Vi du: ZOYI ZT-X, ZT-S1, ZT-Y.
Cach Chon Dong Ho Van Nang So Phu Hop
- Xac dinh nhu cau: Dien gia dinh (chon 6000 counts), dien tu chuyen sau (chon >20000 counts), dien cong nghiep (chon True RMS + CAT III/IV).
- Chon CAT Rating phu hop: CAT II – thiet bi dien tu nho; CAT III – thiet bi phan phoi dien; CAT IV – nguon dien ngoai troi, nha may.
- True RMS: Bat buoc neu thuong xuyen do thiet bi dien tu, bien tan, hoac moi truong cong nghiep.
- Tinh nang bo sung: NCV (phat hien dien ap tu xa), do nhiet do (HVAC), Max/Min (theo doi dong khoi dong).
- Thuong hieu: ZOYI la thuong hieu duoc nhieu ky thuat vien Viet Nam va the gioi tin dung nho gia re, chat luong tot.
Cau Hoi Thuong Gap (FAQ)
Dong ho van nang so khac dong ho van nang kim the nao?
Dong ho so hien thi bang so, de doc, do chinh xac hon, co nhieu chuc nang han. Dong ho kim (analog) nhanh hon khi phat hien su thay doi dien ap, phu hop cho ky thuat vien lanh nghe.
Counts la gi? 2000 counts vs 6000 counts khac nhau the nao?
Counts la so luong gia tri hien thi toi da. Vi du: 2000 counts hien thi toi da 1.999, 6000 counts hien thi toi da 5.999. Counts cang cao, do phan giai cang tot.
Co can mua True RMS khong?
Co, neu ban do trong moi truong cong nghiep, bien tan, hoac thiet bi dien tu co nhieu nhieu. True RMS do chinh xac ca dang song khong sine.
Dong ho van nang ZOYI co tot khong?
ZOYI la thuong hieu Trung Quoc nhung duoc danh gia cao nho chat luong on dinh, gia phai chang, che do bao hanh tot. Phu hop da so nguoi dung tai Viet Nam.
Tu Van Chon Dong Ho Van Nang Phu Hop
Goi ngay de duoc tu van mien phi
📞 0904.57.9990 | Zalo: 0904579990
