?Even homebrew LC meters can be as accurate , if not more accurat. Of course i ahave read that while using the microcontroller, the test results drift twice the erroe in the clock it is using,? It has relevance to the code that is being used.
?Suppose we are using VK3BHR design , we can pre calibrate the clock comparing it with known stadard reference.
?There after the code reflected errors also would be minimized.
On Mon, Nov 13, 2017 at 8:44 PM, John Kirby <n3aaz_qrp_1@...> wrote:
?" "A bit more on accuracy and tolerance.? Your commercial or homebrewed LC meter will only be as accurate as its calibration" "
I respectively disagree with the above quote comment. The point I tried to make is that an extremely accurate capacitor value can be determined regardless of test equipment calibration status or "standard" component tolerance.
I failed to make my point above, maybe an example...
One analogy of the old (1950s) GDO empirical measuring technique I describe above.
?If you put 73 marbles into a bag, then I remove a number from the bag, how would you determine how many marbles I took out of the bag? ... ...Count the marbles left in the bag and substract from 73... That was an empirical measurement ...
If you parallel two capacitors and measure the total capacitance, then I remove one capacitor, how would you determine the value of the capacitor I removed?
Again ... meter accuracy and or 'standard' component tollerance play no roll in this type of L/C measurement. The value of the capacitor I removed is 'spot on' assuming a clean and proper test fixture.
