You don't "need" the bottom of the chart which is -j50. Read your value
midband on the measured curve at 3.750 MHz (not critical).
Extreme right on the Smith Chart is an open while the extreme left is a
short - both on the horizontal line.
Dave - W?LEV
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On Sun, Feb 20, 2022 at 7:48 PM Joe WB9SBD <nss@...> wrote:
oK,
UST TRIED WITH A STIMULUS SPAN OF 3.5 TO 4 MEG.
Oops cap lock, anyway.
The smith chart curve starts at the far right, short? or open? UG memory
again,,,
anyway the curve starts at the far right, but only curves down to say
the 4 to 5 o clock position it doesn't get to the bottom of the display.
so Now what?
Joe WB9SBD / W9ET
On 2/20/2022 12:20 PM, W0LEV wrote:
It's best to measure the capacitor at the frequency of interest,
especially
as that frequency increases. For a "sticker value", use a low frequency
-
1 MHz or less. As the frequency increases, parasitic inductance becomes
more and more evident which cancels some of the effective capacitance.
Dave - W?LEV
On Sun, Feb 20, 2022 at 2:52 PM Joe WB9SBD<nss@...> wrote:
What is a typical stimulus range for measuring a Cap?
If it makes any difference it is a 500pf cap, and is used between 3.5
and 4 Mhz.
Should I set the stimulus rage for those values?
And the measurement should be taken when the smith chart tracer thing is
right at the bottom like 6 O'clock position correct?
Joe WB9SBD / W9ET
--
*Dave - W?LEV*
*Just Let Darwin Work*
