![\"\"](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2024\/07\/huong-dan-su-dung-dong-ho-vom.jpg\" "\\"H\u01b0\u1edbng")
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\u0110\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng (VOM) l\u00e0 thi\u1ebft b\u1ecb \u0111o kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u01b0\u1ee3c v\u1edbi b\u1ea5t k\u1ef3 m\u1ed9t k\u1ef9 thu\u1eadt vi\u00ean \u0111i\u1ec7n t\u1eed n\u00e0o, \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng c\u00f3 4 ch\u1ee9c n\u0103ng ch\u00ednh l\u00e0 \u0110o \u0111i\u1ec7n tr\u1edf, \u0111o \u0111i\u1ec7n \u00e1p DC, \u0111o \u0111i\u1ec7n \u00e1p AC v\u00e0 \u0111o d\u00f2ng \u0111i\u1ec7n.<\/span><\/p>\n \u01afu \u0111i\u1ec3m c\u1ee7a \u0111\u1ed3ng h\u1ed3 l\u00e0 \u0111o nhanh, ki\u1ec3m tra \u0111\u01b0\u1ee3c nhi\u1ec1u lo\u1ea1i linh ki\u1ec7n, th\u1ea5y \u0111\u01b0\u1ee3c s\u1ef1 ph\u00f3ng n\u1ea1p c\u1ee7a t\u1ee5 \u0111i\u1ec7n, tuy nhi\u00ean \u0111\u1ed3ng h\u1ed3 n\u00e0y c\u00f3 h\u1ea1n ch\u1ebf v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 c\u00f3 tr\u1edf kh\u00e1ng th\u1ea5p kho\u1ea3ng 20K\/Vol do v\u00e2y khi \u0111o v\u00e0o c\u00e1c m\u1ea1ch cho d\u00f2ng th\u1ea5p ch\u00fang b\u1ecb s\u1ee5t \u00e1p.<\/span><\/p>\n Khi \u0111o \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u ta chuy\u1ec3n thang \u0111o v\u1ec1 c\u00e1c thang AC, \u0111\u1ec3 thang AC cao h\u01a1n \u0111i\u1ec7n \u00e1p c\u1ea7n \u0111o m\u1ed9t n\u1ea5c, V\u00ed d\u1ee5 n\u1ebfu \u0111o \u0111i\u1ec7n \u00e1p AC220V ta \u0111\u1ec3 thang AC 250V, n\u1ebfu ta \u0111\u1ec3 thang th\u1ea5p h\u01a1n \u0111i\u1ec7n \u00e1p c\u1ea7n \u0111o th\u00ec \u0111\u1ed3ng h\u1ed3 b\u00e1o k\u1ecbch kim, n\u1ebfu \u0111\u1ec3 thanh qu\u00e1 cao th\u00ec kim b\u00e1o thi\u1ebfu ch\u00ednh x\u00e1c.<\/span><\/p>\n Ch\u00fa \u00fd:<\/strong>\u00a0<\/em>Tuy\u1ec7t \u0111\u1ed1i kh\u00f4ng \u0111\u1ec3 thang \u0111o \u0111i\u1ec7n tr\u1edf hay thang \u0111o d\u00f2ng \u0111i\u1ec7n khi \u0111o v\u00e0o \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u. N\u1ebfu nh\u1ea7m \u0111\u1ed3ng h\u1ed3 s\u1ebd b\u1ecb h\u1ecfng ngay l\u1eadp t\u1ee9c!<\/span><\/p>\n * N\u1ebfu \u0111\u1ec3 thang \u0111o \u00e1p DC m\u00e0 \u0111o v\u00e0o ngu\u1ed3n AC th\u00ec kim \u0111\u1ed3ng h\u1ed3 kh\u00f4ng b\u00e1o, nh\u01b0ng \u0111\u1ed3ng h\u1ed3 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng.<\/span><\/p>\n Khi \u0111o \u0111i\u1ec7n \u00e1p m\u1ed9t chi\u1ec1u DC, ta nh\u1edb chuy\u1ec3n thang \u0111o v\u1ec1 thang DC, khi \u0111o ta \u0111\u1eb7t que \u0111\u1ecf v\u00e0o c\u1ef1c d\u01b0\u01a1ng (+) ngu\u1ed3n, que \u0111en v\u00e0o c\u1ef1c \u00e2m (-) ngu\u1ed3n, \u0111\u1ec3 thang \u0111o cao h\u01a1n \u0111i\u1ec7n \u00e1p c\u1ea7n \u0111o m\u1ed9t n\u1ea5c.<\/span><\/p>\n V\u00ed d\u1ee5 n\u1ebfu \u0111o \u00e1p DC 110V ta \u0111\u1ec3 thang DC 250V, tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec3 thang \u0111o th\u1ea5p h\u01a1n \u0111i\u1ec7n \u00e1p c\u1ea7n \u0111o => kim b\u00e1o k\u1ecbch kim, tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec3 thang qu\u00e1 cao => kim b\u00e1o thi\u1ebfu ch\u00ednh x\u00e1c.<\/span><\/p>\n * Tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec3 sai thang \u0111o:<\/em><\/strong><\/span><\/p>\n N\u1ebfu ta \u0111\u1ec3 sai thang \u0111o, \u0111o \u00e1p m\u1ed9t chi\u1ec1u nh\u01b0ng ta \u0111\u1ec3 \u0111\u1ed3ng h\u1ed3 thang xoay chi\u1ec1u th\u00ec \u0111\u1ed3ng h\u1ed3 s\u1ebd b\u00e1o sai, th\u00f4ng th\u01b0\u1eddng gi\u00e1 tr\u1ecb b\u00e1o sai cao g\u1ea5p 2 l\u1ea7n gi\u00e1 tr\u1ecb th\u1ef1c c\u1ee7a \u0111i\u1ec7n \u00e1p DC, tuy nhi\u00ean \u0111\u1ed3ng h\u1ed3 c\u0169ng kh\u00f4ng b\u1ecb h\u1ecfng.<\/span><\/p>\n * Tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec3 nh\u1ea7m thang \u0111o:<\/em><\/strong><\/span><\/p>\n Ch\u00fa \u00fd: Tuy\u1ec7t \u0111\u1ed1i kh\u00f4ng \u0111\u1ec3 nh\u1ea7m \u0111\u1ed3ng h\u1ed3 v\u00e0o thang \u0111o d\u00f2ng \u0111i\u1ec7n ho\u1eb7c thang \u0111o \u0111i\u1ec7n tr\u1edf khi ta \u0111o \u0111i\u1ec7n \u00e1p m\u1ed9t chi\u1ec1u (DC), n\u1ebfu nh\u1ea7m \u0111\u1ed3ng h\u1ed3 s\u1ebd b\u1ecb h\u1ecfng ngay!<\/span><\/p>\n V\u1edbi thang \u0111o \u0111i\u1ec7n tr\u1edf c\u1ee7a \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng ta c\u00f3 th\u1ec3 \u0111o \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u th\u1ee9.<\/span><\/p>\n * \u0110\u1ec3 s\u1eed d\u1ee5ng \u0111\u01b0\u1ee3c c\u00e1c thang \u0111o n\u00e0y \u0111\u1ed3ng h\u1ed3 ph\u1ea3i \u0111\u01b0\u1ee3c l\u1eafp 2 P\u1ecbn ti\u1ec3u 1,5V b\u00ean trong, \u0111\u1ec3 x\u1eed d\u1ee5ng c\u00e1c thang \u0111o 1Kohm ho\u1eb7c 10Kohm ta ph\u1ea3i l\u1eafp Pin 9V.<\/span><\/p>\n \u0110\u1ec3 \u0111o tri s\u1ed1 \u0111i\u1ec7n tr\u1edf ta th\u1ef1c hi\u1ec7n theo c\u00e1c b\u01b0\u1edbc sau:<\/span><\/p>\n B\u01b0\u1edbc 1:<\/em><\/strong> \u0110\u1ec3 thang \u0111\u1ed3ng h\u1ed3 v\u1ec1 c\u00e1c thang \u0111o tr\u1edf, n\u1ebfu \u0111i\u1ec7n tr\u1edf nh\u1ecf th\u00ec \u0111\u1ec3 thang x1 ohm ho\u1eb7c x10 ohm, n\u1ebfu \u0111i\u1ec7n tr\u1edf l\u1edbn th\u00ec \u0111\u1ec3 thang x1Kohm ho\u1eb7c 10Kohm. => Sau \u0111\u00f3 ch\u1eadp hai que \u0111o v\u00e0 ch\u1ec9nh tri\u1ebft \u00e1o \u0111\u1ec3 kim \u0111\u1ed3ng h\u1ed3 b\u00e1o v\u1ecb tr\u00ed 0 ohm.<\/span><\/p>\n B\u01b0\u1edbc 2:<\/em><\/strong>\u00a0Chu\u1ea9n b\u1ecb \u0111o.<\/span><\/p>\n B\u01b0\u1edbc 3:<\/strong><\/em>\u00a0\u0110\u1eb7t que \u0111o v\u00e0o hai \u0111\u1ea7u \u0111i\u1ec7n tr\u1edf, \u0111\u1ecdc tr\u1ecb s\u1ed1 tr\u00ean thang \u0111o , Gi\u00e1 tr\u1ecb \u0111o \u0111\u01b0\u1ee3c = ch\u1ec9 s\u1ed1 thang \u0111o X thang \u0111o<\/span><\/p>\n V\u00ed d\u1ee5: n\u1ebfu \u0111\u1ec3 thang x 100 ohm v\u00e0 ch\u1ec9 s\u1ed1 b\u00e1o l\u00e0 27 th\u00ec gi\u00e1 tr\u1ecb l\u00e0 = 100 x 27 = 2700 ohm = 2,7 K ohm<\/span><\/p>\n B\u01b0\u1edbc 4:<\/em><\/strong>\u00a0N\u1ebfu ta \u0111\u1ec3 thang \u0111o qu\u00e1 cao th\u00ec kim ch\u1ec9 l\u00ean m\u1ed9t ch\u00fat , nh\u01b0 v\u1eady \u0111\u1ecdc tr\u1ecb s\u1ed1 s\u1ebd kh\u00f4ng ch\u00ednh x\u00e1c.<\/span><\/p>\n B\u01b0\u1edbc 5:<\/strong><\/em>\u00a0N\u1ebfu ta \u0111\u1ec3 thang \u0111o qu\u00e1 th\u1ea5p, kim l\u00ean qu\u00e1 nhi\u1ec1u, v\u00e0 \u0111\u1ecdc tr\u1ecb s\u1ed1 c\u0169ng kh\u00f4ng ch\u00ednh x\u00e1c.<\/span><\/p>\n Khi \u0111o \u0111i\u1ec7n tr\u1edf ta ch\u1ecdn thang \u0111o sao cho kim b\u00e1o g\u1ea7n v\u1ecb tr\u00ed gi\u1eefa v\u1ea1ch ch\u1ec9 s\u1ed1 s\u1ebd cho \u0111\u1ed9 ch\u00ednh x\u00e1c cao nh\u1ea5t.<\/span><\/p>\n Ta c\u00f3 th\u1ec3 d\u00f9ng thang \u0111i\u1ec7n tr\u1edf \u0111\u1ec3 ki\u1ec3m tra \u0111\u1ed9 ph\u00f3ng n\u1ea1p v\u00e0 h\u01b0 h\u1ecfng c\u1ee7a t\u1ee5 \u0111i\u1ec7n , khi \u0111o t\u1ee5 \u0111i\u1ec7n , n\u1ebfu l\u00e0 t\u1ee5 g\u1ed1m ta d\u00f9ng thang \u0111o x1K ohm ho\u1eb7c 10K ohm, n\u1ebfu l\u00e0 t\u1ee5 ho\u00e1 ta d\u00f9ng thang x 1 ohm ho\u1eb7c x 10 ohm.<\/span><\/p>\n Ph\u00e9p \u0111o t\u1ee5 g\u1ed1m tr\u00ean cho ta bi\u1ebft:<\/span><\/strong><\/p>\n T\u1ee5 C1 c\u00f2n t\u1ed1t => kim ph\u00f3ng n\u1ea1p khi ta \u0111o<\/span><\/p>\n T\u1ee5 C2 b\u1ecb d\u00f2 => l\u00ean kim nh\u01b0ng kh\u00f4ng tr\u1edf v\u1ec1 v\u1ecb tr\u00ed c\u0169<\/span><\/p>\n T\u1ee5 C3 b\u1ecb ch\u1eadp => kim \u0111\u1ed3ng h\u1ed3 l\u00ean = 0 ohm v\u00e0 kh\u00f4ng tr\u1edf v\u1ec1.<\/span><\/p>\n \u1ede tr\u00ean l\u00e0 ph\u00e9p \u0111o ki\u1ec3m tra c\u00e1c t\u1ee5 ho\u00e1, t\u1ee5 ho\u00e1 r\u1ea5t \u00edt khi b\u1ecb d\u00f2 ho\u1eb7c ch\u1eadp m\u00e0 ch\u1ee7 y\u1ebfu l\u00e0 b\u1ecb kh\u00f4 (gi\u1ea3m \u0111i\u1ec7n dung) khi \u0111o t\u1ee5 ho\u00e1 \u0111\u1ec3 bi\u1ebft ch\u00ednh x\u00e1c m\u1ee9c \u0111\u1ed9 h\u1ecfng c\u1ee7a t\u1ee5 ta c\u1ea7n \u0111o so s\u00e1nh v\u1edbi m\u1ed9t t\u1ee5 m\u1edbi c\u00f3 c\u00f9ng \u0111i\u1ec7n dung.<\/span><\/p>\n \u1ede tr\u00ean l\u00e0 ph\u00e9p \u0111o so s\u00e1nh hai t\u1ee5 ho\u00e1 c\u00f9ng \u0111i\u1ec7n dung, trong \u0111\u00f3 t\u1ee5 C1 l\u00e0 t\u1ee5 m\u1edbi c\u00f2n C2 l\u00e0 t\u1ee5 c\u0169, ta th\u1ea5y t\u1ee5 C2 c\u00f3 \u0111\u1ed9 ph\u00f3ng n\u1ea1p y\u1ebfu h\u01a1n t\u1ee5 C1 => ch\u1ee9ng t\u1ecf t\u1ee5 C2 b\u1ecb kh\u00f4 (gi\u1ea3m \u0111i\u1ec7n dung)<\/span><\/p>\n Ch\u00fa \u00fd khi \u0111o t\u1ee5 ph\u00f3ng n\u1ea1p, ta ph\u1ea3i \u0111\u1ea3o chi\u1ec1u que \u0111o v\u00e0i l\u1ea7n \u0111\u1ec3 xem \u0111\u1ed9 ph\u00f3ng n\u1ea1p.<\/span><\/p>\n \u0110\u1ec3 \u0111o d\u00f2ng \u0111i\u1ec7n b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng, ta \u0111o \u0111\u1ed3ng h\u1ed3 n\u1ed1i ti\u1ebfp v\u1edbi t\u1ea3i ti\u00eau th\u1ee5 v\u00e0 ch\u00fa \u00fd l\u00e0 ch\u1ec9 \u0111o \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n nh\u1ecf h\u01a1n gi\u00e1 tr\u1ecb c\u1ee7a thang \u0111o cho ph\u00e9p, ta th\u1ef1c hi\u1ec7n theo c\u00e1c b\u01b0\u1edbc sau<\/span><\/p>\n B\u01b0\u1edbc 1:<\/strong><\/em>\u00a0\u0110\u1eb7t \u0111\u1ed3ng h\u1ed3 v\u00e0o thang \u0111o d\u00f2ng cao nh\u1ea5t.<\/span><\/p>\n B\u01b0\u1edbc 2:<\/strong><\/em>\u00a0\u0110\u1eb7t que \u0111\u1ed3ng h\u1ed3 n\u1ed1i ti\u1ebfp v\u1edbi t\u1ea3i, que \u0111\u1ecf v\u1ec1 chi\u1ec1u d\u01b0\u01a1ng, que \u0111en v\u1ec1 chi\u1ec1u \u00e2m.<\/span><\/p>\n N\u1ebfu kim l\u00ean th\u1ea5p qu\u00e1 th\u00ec gi\u1ea3m thang \u0111o<\/span><\/p>\n N\u1ebfu kim l\u00ean k\u1ecbch kim th\u00ec t\u0103ng thang \u0111o, n\u1ebfu thang \u0111o \u0111\u00e3 \u0111\u1ec3 thang cao nh\u1ea5t th\u00ec \u0111\u1ed3ng h\u1ed3 kh\u00f4ng \u0111o \u0111\u01b0\u1ee3c d\u00f2ng \u0111i\u1ec7n n\u00e0y.<\/span><\/p>\n Ch\u1ec9 s\u1ed1 kim b\u00e1o s\u1ebd cho ta bi\u1ebft gi\u00e1 tr\u1ecb d\u00f2ng \u0111i\u1ec7n.<\/span><\/p>\n Ta c\u00f3 th\u1ec3 \u0111o d\u00f2ng \u0111i\u1ec7n qua t\u1ea3i b\u1eb1ng c\u00e1ch \u0111o s\u1ee5t \u00e1p tr\u00ean \u0111i\u1ec7n tr\u1edf h\u1ea1n d\u00f2ng m\u1eafc n\u1ed1i v\u1edbi t\u1ea3i, \u0111i\u1ec7n \u00e1p \u0111o \u0111\u01b0\u1ee3c chia cho gi\u00e1 tr\u1ecb tr\u1edf h\u1ea1n d\u00f2ng s\u1ebd cho bi\u1ebft gi\u00e1 tr\u1ecb d\u00f2ng \u0111i\u1ec7n, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y c\u00f3 th\u1ec3 \u0111o \u0111\u01b0\u1ee3c c\u00e1c d\u00f2ng \u0111i\u1ec7n l\u1edbn h\u01a1n kh\u1ea3 n\u0103ng cho ph\u00e9p c\u1ee7a \u0111\u1ed3ng h\u1ed3 v\u00e0 \u0111\u1ed3ng h\u1ed3 c\u0169mg an to\u00e0n h\u01a1n.<\/span><\/p>\n * \u0110\u1ecdc gi\u00e1 tr\u1ecb \u0111i\u1ec7n \u00e1p AC v\u00e0 DC<\/em><\/strong><\/span><\/p>\n Khi \u0111o \u0111i\u1ec7n \u00e1p DC th\u00ec ta \u0111\u1ecdc gi\u00e1 tr\u1ecb tr\u00ean v\u1ea1ch ch\u1ec9 s\u1ed1 DCV.A<\/span><\/p>\n N\u1ebfu ta \u0111\u1ec3 thang \u0111o 250V th\u00ec ta \u0111\u1ecdc tr\u00ean v\u1ea1ch c\u00f3 gi\u00e1 tr\u1ecb cao nh\u1ea5t l\u00e0 250, t\u01b0\u01a1ng t\u1ef1 \u0111\u1ec3 thang 10V th\u00ec \u0111\u1ecdc tr\u00ean v\u1ea1ch c\u00f3 gi\u00e1 tr\u1ecb cao nh\u1ea5t l\u00e0 10. tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec3 thang 1000V nh\u01b0ng kh\u00f4ng c\u00f3 v\u1ea1ch n\u00e0o ghi cho gi\u00e1 tr\u1ecb 1000 th\u00ec \u0111\u1ecdc tr\u00ean v\u1ea1ch gi\u00e1 tr\u1ecb Max = 10, gi\u00e1 tr\u1ecb \u0111o \u0111\u01b0\u1ee3c nh\u00e2n v\u1edbi 100 l\u1ea7n<\/span><\/p>\n Khi \u0111o \u0111i\u1ec7n \u00e1p AC th\u00ec \u0111\u1ecdc gi\u00e1 tr\u1ecb c\u0169ng t\u01b0\u01a1ng t\u1ef1. \u0111\u1ecdc tr\u00ean v\u1ea1ch AC.10V, n\u1ebfu \u0111o \u1edf thang c\u00f3 gi\u00e1 tr\u1ecb kh\u00e1c th\u00ec ta t\u00ednh theo t\u1ef7 l\u1ec7. V\u00ed d\u1ee5 n\u1ebfu \u0111\u1ec3 thang 250V th\u00ec m\u1ed7i ch\u1ec9 s\u1ed1 c\u1ee7a v\u1ea1ch 10 s\u1ed1 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi 25V.<\/span><\/p>\n Khi \u0111o d\u00f2ng \u0111i\u1ec7n th\u00ec \u0111\u1ecdc gi\u00e1 tr\u1ecb t\u01b0\u01a1ng t\u1ef1 \u0111\u1ecdc gi\u00e1 tr\u1ecb khi \u0111o \u0111i\u1ec7n \u00e1p.<\/span><\/p>\n Tr\u00ean \u0111\u00e2y l\u00e0\u00a0h\u01b0\u1edbng d\u1eabn s\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 VOM<\/strong>, hy v\u1ecdng s\u1ebd c\u00f3 \u00edch cho c\u00e1c b\u1ea1n!<\/span><\/p>\n M\u1ecdi chi ti\u1ebft xin vui l\u00f2ng li\u00ean h\u1ec7:<\/i><\/p>\n C\u00d4NG TY C\u1ed4 PH\u1ea6N H\u1eccC VI\u1ec6N IT<\/strong><\/p>\n MST: 0108733789<\/strong><\/p>\n Hotline: 0981 223 001<\/strong><\/p>\n Facebook:<\/strong>\u00a0www.fb.com\/hocvienit<\/a><\/p>\n \u0110\u0103ng k\u00fd k\u00eanh Youtube \u0111\u1ec3 theo d\u00f5i c\u00e1c b\u00e0i h\u1ecdc c\u1ee7a Hu\u1ea5n luy\u1ec7n vi\u00ean t\u1ed1t nh\u1ea5t:<\/strong>\u00a0http:\/\/bit.ly\/Youtube_HOCVIENiT<\/a><\/p>\n2. H\u01b0\u1edbng d\u1eabn \u0111o \u0111i\u1ec7n \u00e1p xoay chi\u1ec1u.<\/strong><\/span><\/h2>\n
![\"S\u1eed](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/su-dung-dong-ho-vom-do-ac.jpg\")
![\"Kh\u00f4ng](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/huong-dan-cach-su-dung-dong-ho-vom-1.jpg\" "\\"Kh\u00f4ng")
![\"\u0110\u1ec3](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/huong-dan-cach-su-dung-dong-ho-vom-2.jpg\" "\\"\u0110\u1ec3")
3. H\u01b0\u1edbng d\u1eabn \u0111o \u0111i\u1ec7n \u00e1p m\u1ed9t chi\u1ec1u DC b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng<\/strong><\/span><\/h2>\n
![\"D\u00f9ng](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/huong-dan-cach-su-dung-dong-ho-vom-3.jpg\" "\\"D\u00f9ng")
![\"\u0110\u1ec3](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/huong-dan-cach-su-dung-dong-ho-vom-4.jpg\" "\\"\u0110\u1ec3")
![\"Tr\u01b0\u1eddng](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/huong-dan-cach-su-dung-dong-ho-vom-5.jpg\" "\\"Tr\u01b0\u1eddng")
4. H\u01b0\u1edbng d\u1eabn \u0111o \u0111i\u1ec7n tr\u1edf v\u00e0 tr\u1edf kh\u00e1ng<\/strong><\/span><\/h2>\n
\n
4.1 \u0110o \u0111i\u1ec7n tr\u1edf<\/strong><\/span><\/h3>\n
![\"\u0110o](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/huong-dan-cach-su-dung-dong-ho-vom-6.jpg\" "\\"\u0110o")
4.2 D\u00f9ng thang \u0111i\u1ec7n tr\u1edf \u0111\u1ec3 \u0111o ki\u1ec3m tra t\u1ee5 \u0111i\u1ec7n<\/strong><\/span><\/h3>\n
![\"](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/huong-dan-cach-su-dung-dong-ho-vom-7.jpg\" "\\"")
![\"](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/huong-dan-cach-su-dung-dong-ho-vom-8.jpg\" "\\"")
5. H\u01b0\u1edbng d\u1eabn \u0111o d\u00f2ng \u0111i\u1ec7n b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng.<\/strong><\/span><\/h2>\n
C\u00e1ch 1: D\u00f9ng thang \u0111o d\u00f2ng<\/strong><\/span><\/h3>\n
C\u00e1ch 2: D\u00f9ng thang \u0111o \u00e1p DC<\/strong><\/span><\/h3>\n
C\u00e1ch \u0111\u1ecdc tr\u1ecb s\u1ed1 d\u00f2ng \u0111i\u1ec7n v\u00e0 \u0111i\u1ec7n \u00e1p khi \u0111o nh\u01b0 th\u1ebf n\u00e0o?<\/em><\/strong><\/span><\/h2>\n
![\"C\u00e1ch](\"https:\/\/hocvienit.vn\/wp-content\/uploads\/2018\/07\/huong-dan-cach-su-dung-dong-ho-vom-9.jpg\" "\\"C\u00e1ch")