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Joseph Hebert
10/07/12 12:05
Read: 481 times
Okemah, Ok
United States


 
#188605 - This is what I'm wondering about.
Responding to: Kai Klaas's previous message
Hi Kai,

This is sort of what I'm wondering about. How often does anyone really need a broadband characterization of a capacitor (or inductor)? And if one does need such critical information, how much value will it be if measured independently of the intended circuit?

This question arose because I ran across an old lab report from undergraduate school that I thought was pretty cool. It was a lab exercise wherein we used a signal generator, a known resistor and an oscilloscope to measure the capacitance of a capacitor. It was a really novel use of an oscilloscope, and with a spreadsheet to do the calculations as the data are entered it would be fairly straightforward to characterize a reactive component over quite a band.

So I thought about writing up a short article about it for a website I'm preparing. On the other hand, I'm just not at all certain it will be of any practical value. As I asked above, how often does one need such data? On the other hand, that such data are needed so infrequently is precisely why most don't have an LCR or Q meter, and even fewer have a network analyzer. And that might make this technique worth knowing, just in case the need arises.

Joe

List of 8 messages in thread
TopicAuthorDate
measuring reactive component values      Joseph Hebert      10/05/12 16:47      
   measuring reactive component values      Joseph Hebert      10/06/12 10:15      
      What cap are we talking about?      Kai Klaas      10/07/12 07:08      
         This is what I'm wondering about.      Joseph Hebert      10/07/12 12:05      
   C and ESR and inductance      Mahmood Elnasser      10/06/12 13:25      
   I've considered the LCR meter approach ...      Richard Erlacher      10/06/12 14:04      
   Qmeter      Daniel Contarino      10/06/12 18:51      
   Buy or make?      Oliver Sedlacek      10/08/12 04:26      

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