tutorials:learn:multimeter:resistance.html
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tutorials:learn:multimeter:resistance.html [2010/10/18 20:54] daigo |
tutorials:learn:multimeter:resistance.html [2016/01/28 18:05] (current) |
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| Look for an ohm (Ω) symbol, if its a ranging meter there will be a bunch of subdivided modes. If its auto-ranging there will be only one. | Look for an ohm (Ω) symbol, if its a ranging meter there will be a bunch of subdivided modes. If its auto-ranging there will be only one. | ||
| - | {{ http://www.ladyada.net/images/metertutorial/wavetek_resmode.jpg?nolink&292x200 |}} \\ This meter has the Ω symbol and then 7 submodes, ranging from 200Ω to 2000MΩ (wow!) | + | {{ http://www.ladyada.net/images/metertutorial/wavetek_resmode.jpg?nolink&292x200 |}} |
| + | <class center> This meter has the Ω symbol and then 7 submodes, ranging from 200Ω to 2000MΩ (wow!) </class> | ||
| - | {{ http://www.ladyada.net/images/metertutorial/mas830_resmode.jpg?nolink&292x205 |}} \\ This meter has the Ω symbol and then 5 submodes, ranging from 200Ω to 2MΩ | + | {{ http://www.ladyada.net/images/metertutorial/mas830_resmode.jpg?nolink&292x205 |}} |
| + | <class center> This meter has the Ω symbol and then 5 submodes, ranging from 200Ω to 2MΩ </class> | ||
| - | {{ http://www.ladyada.net/images/metertutorial/extech_multimode.jpg?nolink&200x176 |}} \\ This meter has a multi-mode (you need to press a seperate MODE button to change between capacitor sense, diode test, resistor test and continuity!) It does not, however, have any numbered submodes, as it is auto-ranging | + | {{ http://www.ladyada.net/images/metertutorial/extech_multimode.jpg?nolink&200x176 |}} |
| + | <class center> This meter has a multi-mode (you need to press a seperate MODE button to change between capacitor sense, diode test, resistor test and continuity!) It does not, however, have any numbered submodes, as it is auto-ranging </class> | ||
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| This is a 10KΩ linear potentiometer | This is a 10KΩ linear potentiometer | ||
| - | [[http://www.ladyada.net/images/metertutorial/linpotmin.jpg|{{ http://www.ladyada.net/images/metertutorial/linpotmin_t.jpg?nolink&500x375 |}}]] \\ The minimum resistance of the pot, 0Ω (a short) as expected [[http://www.ladyada.net/images/metertutorial/linpotmid.jpg|{{ http://www.ladyada.net/images/metertutorial/linpotmid_t.jpg?nolink&500x375 |}}]] \\ Potentiometer centered, about 5KΩ[[http://www.ladyada.net/images/metertutorial/linpotmax.jpg|{{ http://www.ladyada.net/images/metertutorial/linpotmax_t.jpg?nolink&500x375 |}}]] \\ Maximum value is 9.5KΩ (it should be around 10KΩ) This video shows the resistance of a 10KΩ linear pot as it is adjusted. At the end it is set to approximately the midd, which is measured at 4.7KΩ, pretty close to the 'ideal' of 5KΩ. | + | [[http://www.ladyada.net/images/metertutorial/linpotmin.jpg|{{ http://www.ladyada.net/images/metertutorial/linpotmin_t.jpg?nolink&500x375 |}}]] |
| + | <class center> The minimum resistance of the pot, 0Ω (a short) as expected</class> | ||
| + | [[http://www.ladyada.net/images/metertutorial/linpotmid.jpg|{{ http://www.ladyada.net/images/metertutorial/linpotmid_t.jpg?nolink&500x375 |}}]] | ||
| + | <class center> Potentiometer centered, about 5KΩ</class> | ||
| + | [[http://www.ladyada.net/images/metertutorial/linpotmax.jpg|{{ http://www.ladyada.net/images/metertutorial/linpotmax_t.jpg?nolink&500x375 |}}]] | ||
| + | <class center> Maximum value is 9.5KΩ (it should be around 10KΩ) </class> | ||
| + | |||
| + | This video shows the resistance of a 10KΩ linear pot as it is adjusted. At the end it is set to approximately the midd, which is measured at 4.7KΩ, pretty close to the 'ideal' of 5KΩ. | ||
| Line 143: | Line 153: | ||
| - | Here are photos of a 50KΩ audio potentiometer[[http://www.ladyada.net/images/metertutorial/logpotmin.jpg|{{ http://www.ladyada.net/images/metertutorial/logpotmin_t.jpg?nolink&500x375 |}}]] \\ Minimum is 0Ω as expected | + | Here are photos of a 50KΩ audio potentiometer[[http://www.ladyada.net/images/metertutorial/logpotmin.jpg|{{ http://www.ladyada.net/images/metertutorial/logpotmin_t.jpg?nolink&500x375 |}}]] |
| + | <class center> Minimum is 0Ω as expected</class> | ||
| [[http://www.ladyada.net/images/metertutorial/logpotmid.jpg|{{ http://www.ladyada.net/images/metertutorial/logpotmid_t.jpg?nolink&500x375 |}}]] | [[http://www.ladyada.net/images/metertutorial/logpotmid.jpg|{{ http://www.ladyada.net/images/metertutorial/logpotmid_t.jpg?nolink&500x375 |}}]] | ||
| + | <class center>Middle is 8KΩ</class> | ||
| - | Middle is 8KΩ | + | [[http://www.ladyada.net/images/metertutorial/logpotmax.jpg|{{ http://www.ladyada.net/images/metertutorial/logpotmax_t.jpg?nolink&500x375 |}}]] |
| - | + | <class center>Maximum is 54.2KΩ, close to the ideal 50KΩ</class> | |
| - | [[http://www.ladyada.net/images/metertutorial/logpotmax.jpg|{{ http://www.ladyada.net/images/metertutorial/logpotmax_t.jpg?nolink&500x375 |}}]] \\ Maximum is 54.2KΩ, close to the ideal 50KΩ | + | |
| If, when centered, the resistance is more like 85% or 15% of the total resistance, then its a log pot. This is a 50KΩ analog potentiometer. When centered, the resistance is about 8KΩ. | If, when centered, the resistance is more like 85% or 15% of the total resistance, then its a log pot. This is a 50KΩ analog potentiometer. When centered, the resistance is about 8KΩ. | ||
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