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<html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> <link type="text/css" rel="stylesheet" href="../../../../../css/ccna.css"> <script src="../../../../../js/framesetHelper.js" language="JavaScript"></script><script language="JavaScript"> var pageLoaded = false; var current = ''; var currentChapter = 'knet-v214aCH47504'; function launchReference(rioID, rloID, chapterID) { contentID = "knet-v214aCV47051"; dash = contentID.indexOf('-'); sub1 = contentID.substring(0,dash); sub2 = contentID.substring(dash+1); numbackParams = "CHAPID=" + chapterID + "/RLOID=" + rloID + "/RIOID=" + rioID; ContentRef = "../../../../../"+ numbackParams + "/"+ sub1 +"/"+ sub2 +"/"; eval('top.frames.main_frame.location.href="'+ContentRef+'referencecontroller_pf.html"'); } function PrevPage() { top.currentSupport--; if (top.currentSupport <= 0) { returnContent(); } else { if (top.firstSupportPage == top.contentResourceID) { returnContent(); } else if (top.prevPage == quizID) { launchQuiz(); 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//alert(ContentRef); eval('top.frames.main_frame.location.href="'+ContentRef+'pageframesetrio.html"'); //added for navigating between Quiz and Review and back to regular Chapter pages top.currentSupport++; top.firstSupportPage = quizID; top.prevPage = quizID; top.contentResourceID = ''; } function returnContent() { rioID = top.currentPage; rloID = top.currentRLO; ContentID = top.currentChapter; top.firstSupportPage = ''; top.prevPage = ''; top.contentResourceID = ''; top.currentSupport = 0; nbparams = "CHAPID="+ContentID+"/RLOID="+rloID+"/RIOID="+rioID; dash = ContentID.indexOf('-'); sub1 = ContentID.substring(0,dash); sub2 = ContentID.substring(dash+1); ContentRef = "../../../../../"+ nbparams +"/"+ sub1 +"/"+ sub2 +"/" eval('top.frames.main_frame.location.href="'+ContentRef+'pageframesetrio.html"'); } </script> </head> <body leftmargin="20" topmargin="10" marginwidth="30" marginheight="10" bgcolor="#FFFFFF" onLoad="window.focus();" background="../../../../../images/ccna/common/lab/bglab.gif"> <table bgcolor="#000000" cellspacing="0" width="100%" border="0"> <tr> <td width="100%"> <table cellpadding="4" cellspacing="1" width="100%" border="0"> <tr> <td width="10%" bgcolor="#FFFFFF" valign="top"> <table cellpadding="0" cellspacing="0" width="100%" border="0"> <tr> <td width="33%"><script language="JavaScript"> //if (parent.parent.getTopName() == "chapterframeset") //{ var imgSource = '../../../../../images/ccna/common/lab/labback.gif'; document.write('<a href="javascript:PrevPage();">'); document.write('<img src="' + imgSource + '" border="0">'); document.write('</a>'); //} </script></td><td width="33%"></td> </tr> </table> <p> </p> </td><td bgcolor="#FFFFFF" valign="top"> <p align="left"> <span class="resourceTitle">4.2.2 Using a multimeter to make resistance measurements</span> </p><object height="100%" width="100%" codebase="http://active.macromedia.com/flash4/cabs/swflash.cab#version=4,0,0,0" classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"><param name="movie" value="../../../../../CHAPID=knet-v214aCH47504/RLOID=knet-v214aRLO47543/RIOID=knet-v214aRIO121143/knet/v214aVID4802/4_2_2.swf"><param value="high" name="quality"> <embed height="100%" width="100%" pluginspage="http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" quality="high" src="../../../../../CHAPID=knet-v214aCH47504/RLOID=knet-v214aRLO47543/RIOID=knet-v214aRIO121143/knet/v214aVID4802/4_2_2.swf"> </embed> </object>Instructor Note<p class="smtext">There are two purposes for this target indicator - a lab activity - is to study the electrical properties of materials by measuring their resistance, and to study the conductive properties of passive network components (cables, jacks, connectors) using the continuity measurement of the multimeter.</p><p class="smtext">The lab activity requires approximately 30 minutes.</p><p class="smtext">This lab session demonstrates the use of a multimeter to measure the resistance and continuity of objects. The unit of measurement for both is the ohm (惟). <i>Continuity</i> refers to the level of resistance of a path. If a path is intentionally made into a low-resistance path, for use by two connected electrical devices, then the path has what is called continuity. If a path is unintentionally made into a low-resistance path, then it is called a <i>short circuit.</i> </p><p class="smtext">With either measurement, the multimeter emits a high-pitched sound when it detects a low-resistance path. Measurements will be made on the following:</p><span class="smtext"> <ul type="disc"><li>CAT 5 cable</li><li>terminated CAT 5 cable</li><li>terminated coaxial cable</li><li>telephone wire</li><li>CAT 5 jacks</li><li>switches</li><li>wall outlets</li></ul> </span><a href="#" onClick="javascript:launchReference('knet-v214aRIO125212', 'null', 'null');void(null);">Lab Activity</a><p class="smtext">In this lab, you will demonstrate your ability to measure resistance and continuity with the multimeter.</p>Web Links<a target="_blank" href="http://www.autospeed.com/A_0072/P_1/article.html"><span class="smtext">Using a Multimeter</span></a></td> </tr> </table> </td> </tr> </table> </body></html>⌨️ 快捷键说明
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