[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-562735-105":59,"doc-detail-562735-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","can-an-ohmmeter-test-thyristors-and-triacs-proper-hookup","Can an Ohmmeter Test Thyristors and Triacs - Proper Hookup","","The document explains how to test thyristors (SCRs) and triacs using an ohmmeter to evaluate their gate firing and conduction behavior. It details expected high and low resistance readings under different lead polarities and during brief gate-to-anode connections, plus a practical approximation method measuring gate firing resistance. It also covers how to interpret “open” versus “short” outcomes, and gives a simplified triac/thyristor test with temporary jumpers and an AC lamp check.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/can-an-ohmmeter-test-thyristors-and-triacs-proper-hookup/562735/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/can-an-ohmmeter-test-thyristors-and-triacs-proper-hookup/562735.png","ImageObject",300,407,{"name":92,"@type":93},"LangkahRina","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-19","2026-10-12",true,{"@type":102,"interactionType":103,"userInteractionCount":8},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"How can an ohmmeter be used to test an SCR (thyristor)?","Question",{"text":112,"@type":113},"Set the ohmmeter to the R x 1 range and verify high resistance with the gate absent in both polarities. Then briefly connect the gate to the anode; the resistance should drop low and return high when the gate lead is lifted.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What resistance behavior should be expected when testing a triac?",{"text":117,"@type":113},"With the ohmmeter connected to the specified pins, the reading should be high when no gate signal is present. Momentarily linking the gate to anode 2 should drive the resistance low and it should stay low until the gate-to-anode 2 connection is removed, with the polarity reversal requiring the same gate-dependent response.",{"name":119,"@type":110,"acceptedAnswer":120},"How should “open” and “short” failures be interpreted on SCRs/diodes?",{"text":121,"@type":113},"A valid “short” indication corresponds to 0 (short) resistance in the required measurement directions, while an “open” corresponds to infinite resistance in both directions. The document notes that diode polarity normally shows low resistance in one direction and high resistance when the probes are reversed, providing a polarity check.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},562735,1792399289,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":14,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":24},962090893776,"https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d","Can an Ohmmeter Test  \nThyristors and Triacs?  \nQuestion:  \nCan I use an ohmmeter to test thyristors and triacs satisfactorily? If so, can someone provide a description and a sketch showing the proper hookup? Also, what kind of meter is recommended? -M. B. L.  \nAnswer:  \nWhen M. B. L. says thyristor, I assume he is referring to a semiconductor controlled rectifier (SCR), also called areverse-blocking triode or thyristor. The SCR is a three-terminal device, being essentially an open circuit (anode-tocathode) with gate voltage absent, and a solid-state rectifier when gate voltage is applied. It may be tested as follows:  \n• Connect the ohmmeter as shown in Fig. 1A. Use the R x 1 range. The measured resistance should be high (greater than 1 megohm) . Next, reconnect the ohmmeter with reversed leads as in B. Again, the measured resistance should be high.  \n• With the ohmmeter leads connected as in B, momentarily connect the gate to the anode. The resistance should now read low (less than 1000 ohms), even when the gate connection has been broken. The SCR resistance instantly goes again high in both directions when either ohmmeter lead is lifted.  \nThe triac is a thyristor with three terminals. It is an open circuit with no gate signal present, but conducts in both directions when gate voltage is applied. It is tested as follows:  \n• Connect the ohmmeter as shown in Fig. 2C. The measured resistance should be high. Momentarily connect the gate toanode 2; the resistance should go low and remain low even when the gate connection is broken. Reconnect theohmmeter with opposite polarity as shown in Fig. 2D. The reading should again be high until the gate-to-anode 2 connection is made, then go low as it did before. Although you will occasionally face an SCR or triac for which theohmmeter can't supply sufficient testing current, and current from the R x 1 range may damage some sensitive-gate SCRs, the basic multimeters are effective for these tests. -W. M. C.  \nAnswer:  \nA test can be performed on many SCRs and triacs for an approximate evaluation of their gate firing capabilities by connecting an ohmmeter, so that the negative lead is connected to cathode and the positive lead is connected to anode. Using the R x 1 scale, short the gate to the anode. A reading of approximately 15 to 50 ohms is normal. When the gateto-anode short is removed, the same reading should still show on the meter until the ohmmeter leads are removed from cathode or the anode. Now, reconnecting the meter leads to cathode and anode should show no reading until the gate is again shorted to the anode. For performing this test, any ohmmeter will do. Make sure that the resistance measurement is being taken across the device and not something else in the circuit. Open an anode, cathode, or gate connection if in doubt. Note also that the only valid “failure\" SCR or diode resistance indications are “open\" and \"short.”  \nThe anode-cathode or gate cathode measurement must show a short (0 resistance) in both directions (forward and reverse polarity) for a device to be considered \"shorted\" and infinite resistance in both directions for an “open.\" A diode normally shows low resistance in the forward direction and high resistance when the VOM probes are reversed. Hence, the VOM can be a check on diode polarity. The SCR normally has a high resistance across the anode-cathode in both directions. For a SCR to be open, the gate-cathode must also show open. -J. E. R.  \nAnswer:  \nTo test a triac: connect ohmmeter to pins No. 1 and 2 as shown in Fig. 3. Set ohm scale to x 1 or x 10. The meter should read near infinity. This indicates the power circuit is \"off.\" Next, install temporary jumper between pins No. 2 and 3. Meter should drop to zero or very low. This indicates the power circuit is closed. Another handy test is to connect 120V AC (or less) as shown in Fig. 3B. The lamp should go on and off, depending on the position of the jumper. The test for a thyristor is essentially the sam","cbCaieAdnDIzJnRF","https://ap.wps.com/l/cbCaieAdnDIzJnRF","pdf",18962,"English","# Can an Ohmmeter Test Thyristors and Triacs?\n## Testing SCR (thyristor) with an ohmmeter\n## Testing a triac with an ohmmeter\n## Interpreting open vs short and diode checks\n## Quick tests using jumpers and an AC lamp","[{\"question\":\"How can an ohmmeter be used to test an SCR (thyristor)?\",\"answer\":\"Set the ohmmeter to the R x 1 range and verify high resistance with the gate absent in both polarities. Then briefly connect the gate to the anode; the resistance should drop low and return high when the gate lead is lifted.\"},{\"question\":\"What resistance behavior should be expected when testing a triac?\",\"answer\":\"With the ohmmeter connected to the specified pins, the reading should be high when no gate signal is present. Momentarily linking the gate to anode 2 should drive the resistance low and it should stay low until the gate-to-anode 2 connection is removed, with the polarity reversal requiring the same gate-dependent response.\"},{\"question\":\"How should “open” and “short” failures be interpreted on SCRs/diodes?\",\"answer\":\"A valid “short” indication corresponds to 0 (short) resistance in the required measurement directions, while an “open” corresponds to infinite resistance in both directions. The document notes that diode polarity normally shows low resistance in one direction and high resistance when the probes are reversed, providing a polarity check.\"}]","Can an Ohmmeter Test Thyristors and Triacs - Proper Hookup | PDF",1791809619]