{"id":1277,"date":"2021-08-25T10:22:08","date_gmt":"2021-08-25T10:22:08","guid":{"rendered":"http:\/\/manuals.pendulum-instruments.com\/index.php\/manual-group-1\/manual-2\/chapter-3-input-signal-conditioning\/how-to-reduce-or-ignore-noise-and-interference\/"},"modified":"2021-08-25T12:46:50","modified_gmt":"2021-08-25T12:46:50","slug":"how-to-reduce-or-ignore-noise-and-interference","status":"publish","type":"page","link":"https:\/\/manuals.pendulum-instruments.com\/index.php\/frequency-counter-analyzers\/cnt-9xx\/chapter-3-input-signal-conditioning\/how-to-reduce-or-ignore-noise-and-interference\/","title":{"rendered":"How to Reduce or Ignore Noise and Interference"},"content":{"rendered":"\n<p>Sensitive counter input circuits are of course also sensitive to noise. By matching the signal amplitude to the counter&#8217;s input sensitivity, you reduce the risk of erroneous counts from noise and interference. These could otherwise ruin a measurement.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"474\" height=\"348\" src=\"https:\/\/manuals.pendulum-instruments.com\/wp-content\/uploads\/2021\/08\/3-10.png\" alt=\"\" class=\"wp-image-1279\" srcset=\"https:\/\/manuals.pendulum-instruments.com\/wp-content\/uploads\/2021\/08\/3-10.png 474w, https:\/\/manuals.pendulum-instruments.com\/wp-content\/uploads\/2021\/08\/3-10-300x220.png 300w\" sizes=\"auto, (max-width: 474px) 100vw, 474px\" \/><figcaption>Fig. 3-10 Narrow hysteresis gives errone\u00acous triggering on noisy signals.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"282\" src=\"https:\/\/manuals.pendulum-instruments.com\/wp-content\/uploads\/2021\/08\/3-11.png\" alt=\"\" class=\"wp-image-1280\" srcset=\"https:\/\/manuals.pendulum-instruments.com\/wp-content\/uploads\/2021\/08\/3-11.png 472w, https:\/\/manuals.pendulum-instruments.com\/wp-content\/uploads\/2021\/08\/3-11-300x179.png 300w\" sizes=\"auto, (max-width: 472px) 100vw, 472px\" \/><figcaption>Fig. 3-11 Wide trigger hysteresis gives correct triggering.<\/figcaption><\/figure>\n\n\n\n<p>To ensure reliable measuring results, the coun\u00adter has the following functions to reduce or eliminate the effect of noise:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>10x input attenuator<\/li><li>Continuously variable trigger level<\/li><li>Continuously variable hysteresis for some functions<\/li><li>Analog low-pass noise suppression filter<\/li><li>Digital low-pass filter (Trigger Hold-Off)<\/li><\/ul>\n\n\n\n<p>To make reliable measurements possible on very noisy signals, you may use several of the above features simultaneously. Optimizing the input amplitude and the trigger level, using the attenuator and the trigger con\u00adtrol, is independent of input frequency and useful over the entire frequency range. LP fil\u00adters, on the other hand, function selectively over a limited frequency range.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sensitive counter input circuits are of course also sensitive to noise. By matching the signal amplitude to the counter&#8217;s input sensitivity, you reduce the risk of erroneous counts from noise and interference. These could otherwise ruin a measurement. To ensure reliable measuring results, the coun\u00adter has the following functions to reduce or eliminate the effect&hellip; <a class=\"more-link\" href=\"https:\/\/manuals.pendulum-instruments.com\/index.php\/frequency-counter-analyzers\/cnt-9xx\/chapter-3-input-signal-conditioning\/how-to-reduce-or-ignore-noise-and-interference\/\">Continue reading <span class=\"screen-reader-text\">How to Reduce or Ignore Noise and Interference<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1234,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1277","page","type-page","status-publish","hentry","entry"],"_links":{"self":[{"href":"https:\/\/manuals.pendulum-instruments.com\/index.php\/wp-json\/wp\/v2\/pages\/1277","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/manuals.pendulum-instruments.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/manuals.pendulum-instruments.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/manuals.pendulum-instruments.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/manuals.pendulum-instruments.com\/index.php\/wp-json\/wp\/v2\/comments?post=1277"}],"version-history":[{"count":1,"href":"https:\/\/manuals.pendulum-instruments.com\/index.php\/wp-json\/wp\/v2\/pages\/1277\/revisions"}],"predecessor-version":[{"id":1282,"href":"https:\/\/manuals.pendulum-instruments.com\/index.php\/wp-json\/wp\/v2\/pages\/1277\/revisions\/1282"}],"up":[{"embeddable":true,"href":"https:\/\/manuals.pendulum-instruments.com\/index.php\/wp-json\/wp\/v2\/pages\/1234"}],"wp:attachment":[{"href":"https:\/\/manuals.pendulum-instruments.com\/index.php\/wp-json\/wp\/v2\/media?parent=1277"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}