eie Posted February 1, 2005 Report Share Posted February 1, 2005 how is the operation of a dual-ramp DVM?andwhat difference between a counter-ramp DVM and a dual-ramp DVM??thanks~ ??? ??? ??? ??? ??? ??? ??? ??? Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted February 4, 2005 Report Share Posted February 4, 2005 A digital voltmeter has to convert the voltage of the signal to a binary represention for digital readout. This requires an A/D. So a dual ramp A/D uses one ramp that takes the voltage higher and another ramp which lowers the voltage. This is how you create a time difference, by taking the voltage higher then low. A counter then counts the time back to the low voltage. How high the voltage of the signal is determines how high the ramp will take it. The negative ramp pulls the voltage past down the reference voltage. This is how it works. Quote Link to comment Share on other sites More sharing options...
eie Posted February 6, 2005 Author Report Share Posted February 6, 2005 thanks kevinthenwhat difference between a counter-ramp DVM and a dual-ramp DVM??thanks!! Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted February 6, 2005 Report Share Posted February 6, 2005 There is very little difference between the dual slope and the single slope. Both methods are good and even the single slope requires two ramps. I chose a project with the dual slope because I could set the reference voltage at ground potential. It is not often hard to conceptualize the problems with setting a reference voltage. Whenever you have a regulated reference voltage your okay. If you must set the reference through a resistor it will change with the current thus creating a signal. So I would prefer the solid ground as my reference. Quote Link to comment Share on other sites More sharing options...
eie Posted February 8, 2005 Author Report Share Posted February 8, 2005 thank you very much, kevincould u mind giving some books' names or websites about these topic because i would like to know more detail?thanks Quote Link to comment Share on other sites More sharing options...
boose1874 Posted January 29, 2006 Report Share Posted January 29, 2006 push...I have the same question too...does any body have some reference BOOK or Website???please help ....thanks Quote Link to comment Share on other sites More sharing options...
EdwardM Posted January 29, 2006 Report Share Posted January 29, 2006 Hi Allyou could start your websearch at Analog Devices http://www.analog.com/en/cat/0,2878,760,00.htmlBest of LuckEd Quote Link to comment Share on other sites More sharing options...
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