{"id":47004,"date":"2023-04-22T00:45:57","date_gmt":"2023-04-22T05:45:57","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/how-to-test-an-ultrasonic-transducer-with-a-multimeter\/"},"modified":"2025-01-21T07:21:56","modified_gmt":"2025-01-21T12:21:56","slug":"how-to-test-an-ultrasonic-transducer-with-a-multimeter","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/vi\/how-to-test-an-ultrasonic-transducer-with-a-multimeter\/","title":{"rendered":"Ki\u1ec3m tra \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng"},"content":{"rendered":"

Vi\u1ec7c ki\u1ec3m tra \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 c\u01a1 b\u1ea3n, nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra to\u00e0n di\u1ec7n. \u0110\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c v\u00e0 \u0111i\u1ec7n tr\u1edf c\u1ee7a \u0111\u1ea7u d\u00f2, ch\u1ee9 kh\u00f4ng th\u1ec3 \u0111\u00e1nh gi\u00e1 hi\u1ec7u su\u1ea5t ho\u1ea1t \u0111\u1ed9ng th\u1ef1c t\u1ebf. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch s\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng \u0111\u1ec3 ki\u1ec3m tra s\u01a1 b\u1ed9 \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m.<\/p>\n

Ki\u1ec3m tra \u0111i\u1ec7n tr\u1edf<\/h3>\n

\u0110\u1ea7u ti\u00ean, \u0111\u1eb7t \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng \u1edf ch\u1ebf \u0111\u1ed9 \u0111o \u0111i\u1ec7n tr\u1edf (k\u00fd hi\u1ec7u \u03a9). Ch\u1ea1m hai que \u0111o v\u00e0o hai \u0111\u1ea7u n\u1ed1i c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m. Gi\u00e1 tr\u1ecb \u0111i\u1ec7n tr\u1edf c\u1ee7a m\u1ed9t \u0111\u1ea7u d\u00f2 t\u1ed1t th\u01b0\u1eddng n\u1eb1m trong kho\u1ea3ng t\u1eeb v\u00e0i Ohm \u0111\u1ebfn v\u00e0i ch\u1ee5c Ohm, t\u00f9y thu\u1ed9c v\u00e0o lo\u1ea1i \u0111\u1ea7u d\u00f2. N\u1ebfu \u0111\u1ed3ng h\u1ed3 hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb v\u00f4 c\u00f9ng (OL), c\u00f3 th\u1ec3 \u0111\u1ea7u d\u00f2 b\u1ecb h\u1edf m\u1ea1ch. N\u1ebfu hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb g\u1ea7n b\u1eb1ng 0, c\u00f3 th\u1ec3 \u0111\u1ea7u d\u00f2 b\u1ecb ch\u1eadp m\u1ea1ch.<\/p>\n

Ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c<\/h3>\n

Chuy\u1ec3n \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng sang ch\u1ebf \u0111\u1ed9 ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c (th\u01b0\u1eddng c\u00f3 k\u00fd hi\u1ec7u h\u00ecnh diode ho\u1eb7c \u00e2m thanh). Ch\u1ea1m hai que \u0111o v\u00e0o hai \u0111\u1ea7u n\u1ed1i c\u1ee7a \u0111\u1ea7u d\u00f2. N\u1ebfu \u0111\u1ea7u d\u00f2 t\u1ed1t, \u0111\u1ed3ng h\u1ed3 s\u1ebd ph\u00e1t ra ti\u1ebfng b\u00edp li\u00ean t\u1ee5c, cho th\u1ea5y m\u1ea1ch \u0111i\u1ec7n b\u00ean trong \u0111\u1ea7u d\u00f2 \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i. N\u1ebfu kh\u00f4ng c\u00f3 ti\u1ebfng b\u00edp, c\u00f3 th\u1ec3 m\u1ea1ch \u0111i\u1ec7n b\u00ean trong \u0111\u1ea7u d\u00f2 b\u1ecb \u0111\u1ee9t.<\/p>\n

\u0110o \u0111i\u1ec7n dung (n\u1ebfu \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng h\u1ed7 tr\u1ee3)<\/h3>\n

M\u1ed9t s\u1ed1 \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng c\u00f3 ch\u1ee9c n\u0103ng \u0111o \u0111i\u1ec7n dung. \u0110i\u1ec7n dung c\u1ee7a \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m th\u01b0\u1eddng \u0111\u01b0\u1ee3c ghi trong datasheet c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t. So s\u00e1nh gi\u00e1 tr\u1ecb \u0111o \u0111\u01b0\u1ee3c v\u1edbi gi\u00e1 tr\u1ecb trong datasheet \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 t\u00ecnh tr\u1ea1ng c\u1ee7a \u0111\u1ea7u d\u00f2. S\u1ef1 sai l\u1ec7ch \u0111\u00e1ng k\u1ec3 c\u00f3 th\u1ec3 cho th\u1ea5y \u0111\u1ea7u d\u00f2 b\u1ecb h\u01b0 h\u1ecfng.<\/p>\n

B\u1ea3ng t\u00f3m t\u1eaft c\u00e1c l\u1ed7i v\u00e0 c\u00e1ch ki\u1ec3m tra<\/h3>\n\n\n\n\n\n\n\n\n
L\u1ed7i<\/th>\nTri\u1ec7u ch\u1ee9ng<\/th>\nC\u00e1ch ki\u1ec3m tra b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng<\/th>\n<\/tr>\n<\/thead>\n
H\u1edf m\u1ea1ch<\/td>\nKh\u00f4ng ho\u1ea1t \u0111\u1ed9ng<\/td>\n\u0110i\u1ec7n tr\u1edf hi\u1ec3n th\u1ecb OL<\/td>\n<\/tr>\n
Ch\u1eadp m\u1ea1ch<\/td>\nHo\u1ea1t \u0111\u1ed9ng b\u1ea5t th\u01b0\u1eddng<\/td>\n\u0110i\u1ec7n tr\u1edf hi\u1ec3n th\u1ecb g\u1ea7n b\u1eb1ng 0<\/td>\n<\/tr>\n
\u0110\u1ee9t m\u1ea1ch b\u00ean trong<\/td>\nKh\u00f4ng ho\u1ea1t \u0111\u1ed9ng<\/td>\nKh\u00f4ng c\u00f3 ti\u1ebfng b\u00edp khi ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c<\/td>\n<\/tr>\n
\u0110i\u1ec7n dung sai l\u1ec7ch<\/td>\nHi\u1ec7u su\u1ea5t k\u00e9m<\/td>\n\u0110o \u0111i\u1ec7n dung v\u00e0 so s\u00e1nh v\u1edbi datasheet<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

L\u01b0u \u00fd khi ki\u1ec3m tra<\/h3>\n
    \n
  • Lu\u00f4n lu\u00f4n ng\u1eaft k\u1ebft n\u1ed1i \u0111\u1ea7u d\u00f2 kh\u1ecfi ngu\u1ed3n \u0111i\u1ec7n tr\u01b0\u1edbc khi ki\u1ec3m tra.<\/li>\n
  • Tham kh\u1ea3o datasheet c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u1ec3 bi\u1ebft th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee5 th\u1ec3 c\u1ee7a \u0111\u1ea7u d\u00f2.<\/li>\n
  • Vi\u1ec7c ki\u1ec3m tra b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng ch\u1ec9 mang t\u00ednh ch\u1ea5t s\u01a1 b\u1ed9. \u0110\u1ec3 \u0111\u00e1nh gi\u00e1 hi\u1ec7u su\u1ea5t ho\u1ea1t \u0111\u1ed9ng th\u1ef1c t\u1ebf c\u1ee7a \u0111\u1ea7u d\u00f2, c\u1ea7n s\u1eed d\u1ee5ng c\u00e1c thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng.<\/li>\n<\/ul>\n

    T\u00f3m l\u1ea1i, vi\u1ec7c s\u1eed d\u1ee5ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng \u0111\u1ec3 ki\u1ec3m tra \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m l\u00e0 m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p \u0111\u01a1n gi\u1ea3n v\u00e0 nhanh ch\u00f3ng \u0111\u1ec3 ph\u00e1t hi\u1ec7n m\u1ed9t s\u1ed1 l\u1ed7i c\u01a1 b\u1ea3n. Tuy nhi\u00ean, c\u1ea7n nh\u1edb r\u1eb1ng \u0111\u00e2y ch\u1ec9 l\u00e0 b\u01b0\u1edbc ki\u1ec3m tra s\u01a1 b\u1ed9 v\u00e0 kh\u00f4ng th\u1ec3 thay th\u1ebf cho c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra chuy\u00ean s\u00e2u h\u01a1n. N\u1ebfu sau khi ki\u1ec3m tra b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng m\u00e0 v\u1eabn nghi ng\u1edd \u0111\u1ea7u d\u00f2 b\u1ecb l\u1ed7i, b\u1ea1n n\u00ean li\u00ean h\u1ec7 v\u1edbi nh\u00e0 cung c\u1ea5p ho\u1eb7c chuy\u00ean gia \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Vi\u1ec7c ki\u1ec3m tra \u0111\u1ea7u d\u00f2 si\u00eau \u00e2m b\u1eb1ng \u0111\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n x\u00e1c \u0111\u1ecbnh m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 c\u01a1 b\u1ea3n, nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra to\u00e0n di\u1ec7n. \u0110\u1ed3ng h\u1ed3 v\u1ea1n n\u0103ng ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 ki\u1ec3m tra t\u00ednh li\u00ean t\u1ee5c v\u00e0 \u0111i\u1ec7n tr\u1edf c\u1ee7a \u0111\u1ea7u d\u00f2, ch\u1ee9<\/p>\n","protected":false},"author":1,"featured_media":19414,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6406],"tags":[],"class_list":["post-47004","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/47004","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/comments?post=47004"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/posts\/47004\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media\/19414"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/media?parent=47004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/categories?post=47004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/vi\/wp-json\/wp\/v2\/tags?post=47004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}