def test_wire_capacitance_er():
rw = 7.5
s = 50
er = 4
C = mtl.wire_capacitance(s, rw)
Cer = mtl.wire_capacitance(s, rw, er=er)
assert C == approx(Cer / er, abs=1e-14)
def test_wire_capacitance():
# Paul MTL P4.2
rw = 7.5
s = 50
C = mtl.wire_capacitance(s, rw)
C2 = mtl.wire_capacitance(s, rw, rw)
assert C == approx(14.8e-12, abs=0.1e-12)
assert C == approx(C2, abs=0.1e-12)
def test_two_wire_capacitance():
rw = 7.5
s = 50
wires = [Wire(-0.5 * s, 0, rw)]
ref = Wire(0.5 * s, 0, rw)
pair = mtl.WireMtl(wires, ref)
C = mtl.wire_capacitance(s, rw)
assert pair.capacitance()[[0]] == approx(C, rel=0.02, abs=1e-14)
def test_two_wire_capacitance_fdm_near():
rw = 1e-3
s = 3e-3
wires = [Wire(-0.5 * s, 0, rw)]
ref = Wire(0.5 * s, 0, rw)
pair = mtl.WireMtl(wires, ref)
expected = mtl.wire_capacitance(s, rw)
C = pair.capacitance(method='fdm', fdm_params={'dx': rw / 10})
assert C == approx(expected, rel=0.05, abs=0.1e-12)
def test_two_wire_capacitance_diagonal():
rw = 7.5
s = 50
x2 = y2 = s / np.sqrt(2)
wires = [Wire(0, 0, rw)]
ref = Wire(x2, y2, rw)
pair = mtl.WireMtl(wires, ref)
C = mtl.wire_capacitance(s, rw)
assert pair.capacitance()[[0]] == approx(C, rel=0.02, abs=1e-14)
def test_wire_capacitance_rw2_too_close():
rw1 = 10
rw2 = 5
s = 14
with pytest.raises(Exception):
mtl.wire_capacitance(s, rw1, rw2)
def test_wire_capacitance_too_close():
rw = 10
s = 19
with pytest.raises(Exception):
mtl.wire_capacitance(s, rw)