def test_init_from_attenuation_VF_units(self):
"""
Test the attenuation unit conversions in the Coaxial classmethod
`from_attenuation_VF_units`.
"""
# create a dummy Coaxial media for various attenuation and test the
# resulting alpha values (real part of gamma)
frequency = rf.Frequency(npy.random.rand(), unit='GHz', npoints=1)
_att = npy.random.rand()
# dB/m
coax = Coaxial.from_attenuation_VF(frequency=frequency,
VF=1,
att=_att,
unit='dB/m')
assert_almost_equal(coax.gamma.real, rf.db_2_np(_att))
# dB/100m
coax = Coaxial.from_attenuation_VF(frequency=frequency,
VF=1,
att=_att,
unit='dB/100m')
assert_almost_equal(coax.gamma.real, rf.db_2_np(_att) / 100)
# dB/feet
coax = Coaxial.from_attenuation_VF(frequency=frequency,
VF=1,
att=_att,
unit='dB/feet')
assert_almost_equal(coax.gamma.real,
rf.db_2_np(_att) * rf.meter_2_feet())
# dB/100m
coax = Coaxial.from_attenuation_VF(frequency=frequency,
VF=1,
att=_att,
unit='dB/100feet')
assert_almost_equal(coax.gamma.real,
rf.db_2_np(_att) / 100 * rf.meter_2_feet())
# Neper/m
coax = Coaxial.from_attenuation_VF(frequency=frequency,
VF=1,
att=_att,
unit='Np/m')
assert_almost_equal(coax.gamma.real, _att)
# Neper/feet
coax = Coaxial.from_attenuation_VF(frequency=frequency,
VF=1,
att=_att,
unit='Np/feet')
assert_almost_equal(coax.gamma.real, _att * rf.meter_2_feet())
def test_db_per_100feet_2_db_per_100meter(self):
"""
Test attenuation unit conversion dB/100feet to dB/100m
"""
assert_almost_equal(rf.db_per_100feet_2_db_per_100meter(),
rf.meter_2_feet(),
decimal=2)
assert_almost_equal(rf.db_per_100feet_2_db_per_100meter(2.5),
8.2,
decimal=2)
assert_almost_equal(rf.db_per_100feet_2_db_per_100meter(0.28),
0.92,
decimal=2)
def test_meter_2_feet(self):
"""
Test meter to feet length conversion
"""
assert_almost_equal(rf.meter_2_feet(0.01), 0.0328084)
assert_almost_equal(rf.meter_2_feet(1), 3.28084)