I tried the new VIA calcualtor for the first time.
See attached screenshot.
Reconstrucing the formula within Python, my calculation gives the same mantissa but is x100 off from what KiCAD says.
I hardly dare to report a bug here, because I know from experience how easy it is to get orders of magnitudes wrong... But KiCad's resistance values seem so low.
Also, I do not understand what Clearance hole diameter is. The black circle, I guess. Couldn't that be labeled in the sketch? The PCB Calculator shows negative capacitance values for improper input.
Application: KiCad
Version: (5.99.0-135-ga1fe8cfa5-dirty), release build
Libraries:
wxWidgets 3.0.2
libcurl/7.52.1 OpenSSL/1.0.2s zlib/1.2.8 libidn2/0.16 libpsl/0.17.0 (+libidn2/0.16) libssh2/1.7.0 nghttp2/1.18.1 librtmp/2.3
Platform: Linux 4.9.0-3-amd64 x86_64, 64 bit, Little endian, wxGTK
Build Info:
wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8) GTK+ 2.24
Boost: 1.62.0
OpenCASCADE Community Edition: 6.8.0
Curl: 7.52.1
Compiler: GCC 6.3.0 with C++ ABI 1010
Build settings:
KICAD_SCRIPTING=ON
KICAD_SCRIPTING_MODULES=ON
KICAD_SCRIPTING_PYTHON3=OFF
KICAD_SCRIPTING_WXPYTHON=ON
KICAD_SCRIPTING_WXPYTHON_PHOENIX=OFF
KICAD_SCRIPTING_ACTION_MENU=ON
BUILD_GITHUB_PLUGIN=ON
KICAD_USE_OCE=ON
KICAD_USE_OCC=OFF
KICAD_SPICE=ON
KICAD_STDLIB_DEBUG=OFF
KICAD_STDLIB_LIGHT_DEBUG=OFF
KICAD_SANITIZE=OFF
I agree. Those values look too low.
Additionally, for your input values, assuming a max temp rise of 1°C, I would say the ampacity is too high as well (I calculate around 1.43A)
Ahmad, do you have time to look at this one?