tutorials:learn:multimeter:voltage.html
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tutorials:learn:multimeter:voltage.html [2010/10/18 20:58] daigo created |
tutorials:learn:multimeter:voltage.html [2016/01/28 18:05] (current) |
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| [[http://www.ladyada.net/images/metertutorial/wart.jpg|{{ http://www.ladyada.net/images/metertutorial/wart_t.jpg?nolink&500x375 |}}]] | [[http://www.ladyada.net/images/metertutorial/wart.jpg|{{ http://www.ladyada.net/images/metertutorial/wart_t.jpg?nolink&500x375 |}}]] | ||
| - | <script language="Javascript" src="/flickrnotes.php?1280805698"></script><noscript>[[http://www.flickr.com/photo_zoom.gne?id=1280805698&size=l|{{ http://www.ladyada.net/images/metertutorial/wartdetail.jpg?nolink |}}]] </noscript> | + | [[http://www.flickr.com/photo_zoom.gne?id=1280805698&size=l|{{ http://www.ladyada.net/images/metertutorial/wartdetail.jpg?nolink |}}]] |
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| Notice that it's not square, its much thinner and although you cant feel it, its quite light for its size: There is no big honking transformer inside! | Notice that it's not square, its much thinner and although you cant feel it, its quite light for its size: There is no big honking transformer inside! | ||
| - | <script language="Javascript" src="/flickrnotes.php?1280805810"></script><noscript>[[http://www.flickr.com/photo_zoom.gne?id=1280805810&size=l|{{ http://www.ladyada.net/images/metertutorial/smpsdetail.jpg?nolink |}}]]</noscript> | + | [[http://www.flickr.com/photo_zoom.gne?id=1280805810&size=l|{{ http://www.ladyada.net/images/metertutorial/smpsdetail.jpg?nolink |}}]] |
| Note that it says Switching (not Transformer) on the label, and you can input US or European power. Like the transformer adapter, it is center-positive polarity. | Note that it says Switching (not Transformer) on the label, and you can input US or European power. Like the transformer adapter, it is center-positive polarity. | ||
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| Note that is is similar to the transformer-based DC supply we checked out first | Note that is is similar to the transformer-based DC supply we checked out first | ||
| - | <script language="Javascript" src="/flickrnotes.php?1282113408"></script><noscript>[[http://www.flickr.com/photo_zoom.gne?id=1282113408&size=l|{{ http://www.ladyada.net/images/metertutorial/9vactransdetail.jpg?nolink |}}]]</noscript> | + | [[http://www.flickr.com/photo_zoom.gne?id=1282113408&size=l|{{ http://www.ladyada.net/images/metertutorial/9vactransdetail.jpg?nolink |}}]] |
| Note again that the label says transformer. It requires 120VAC input, US power only. The nominal output is 9VAC at 300mA. The output is indicated twice, once at the top "AC/AC" and then again in the output designator "9V AC" \\ There is no polarity because AC adaptors are not polarized: AC power oscillates between positive and negative voltages. | Note again that the label says transformer. It requires 120VAC input, US power only. The nominal output is 9VAC at 300mA. The output is indicated twice, once at the top "AC/AC" and then again in the output designator "9V AC" \\ There is no polarity because AC adaptors are not polarized: AC power oscillates between positive and negative voltages. | ||
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| The lesson? You can't depend on your multimeter to measure AC voltages when there is a DC component! | The lesson? You can't depend on your multimeter to measure AC voltages when there is a DC component! | ||
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