def test_calculate_mil_hdbk_217f_part_stress_missing_environment():
"""calculate_mil_hdbk_217f_part_stress() should return a zero active hazard rate and a non-empty message when the active environment ID is missing."""
ATTRIBUTES['subcategory_id'] = 1
ATTRIBUTES['hazard_rate_method_id'] = 2
ATTRIBUTES['environment_active_id'] = 41
ATTRIBUTES['insulation_id'] = 3
ATTRIBUTES['construction_id'] = 2
ATTRIBUTES['temperature_active'] = 32.0
ATTRIBUTES['temperature_rated_max'] = 85.0
ATTRIBUTES['quality_id'] = 2
ATTRIBUTES['temperature_active'] = 32.0
ATTRIBUTES['power_operating'] = 0.15
ATTRIBUTES['temperature_case'] = 45.0
ATTRIBUTES['theta_jc'] = 70.0
ATTRIBUTES['voltage_rated'] = 5.0
ATTRIBUTES['voltage_ac_operating'] = 0.05
ATTRIBUTES['voltage_dc_operating'] = 3.3
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes, _msg = Semiconductor.calculate_217f_part_stress(**_attributes)
assert isinstance(_attributes, dict)
assert _msg == (
'RAMSTK WARNING: piE is 0.0 when calculating semiconductor, '
'hardware ID: 6 and active environment ID: 41.\n')
assert pytest.approx(_attributes['voltage_ratio'], 0.67)
assert _attributes['temperature_junction'] == 55.5
assert _attributes['lambda_b'] == 0.0034
assert _attributes['piQ'] == 1.0
assert _attributes['piE'] == 0.0
assert _attributes['piC'] == 2.0
assert pytest.approx(_attributes['piT'], 2.6196648)
assert pytest.approx(_attributes['piS'], 0.3778868)
assert _attributes['hazard_rate_active'] == 0.0
def test_temperature_overstress_harsh_environment(temperature_active,
environment_active_id):
"""overstressed() should return True when hot spot temperature is within 15C of rated temperature in a harsh environment and False otherwise."""
ATTRIBUTES['current_operating'] = 0.18
ATTRIBUTES['current_rated'] = 0.5
ATTRIBUTES['voltage_rated'] = 20.0
ATTRIBUTES['voltage_ac_operating'] = 0.005
ATTRIBUTES['voltage_dc_operating'] = 6.0
ATTRIBUTES['temperature_rated_max'] = 125.0
ATTRIBUTES['temperature_active'] = temperature_active
ATTRIBUTES['environment_active_id'] = environment_active_id
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes = Inductor.calculate_hot_spot_temperature(**_attributes)
_attributes = Component.do_check_overstress(**_attributes)
assert isinstance(_attributes, dict)
if temperature_active == 28.7:
assert not _attributes['overstress']
assert _attributes['reason'] == ''
elif temperature_active == 118.2:
assert _attributes['overstress']
assert _attributes['reason'] == ('1. Operating temperature within '
'15.0C of maximum rated '
'temperature.\n')
def test_calculate_mil_hdbk_217f_part_stress():
"""calculate_mil_hdbk_217f_part_stress() should return a dictionary of updated values on success."""
ATTRIBUTES['subcategory_id'] = 1
ATTRIBUTES['hazard_rate_method_id'] = 2
ATTRIBUTES['environment_active_id'] = 4
ATTRIBUTES['insulation_id'] = 3
ATTRIBUTES['construction_id'] = 2
ATTRIBUTES['temperature_active'] = 32.0
ATTRIBUTES['temperature_rated_max'] = 85.0
ATTRIBUTES['quality_id'] = 2
ATTRIBUTES['temperature_active'] = 32.0
ATTRIBUTES['power_operating'] = 0.15
ATTRIBUTES['temperature_case'] = 45.0
ATTRIBUTES['theta_jc'] = 70.0
ATTRIBUTES['voltage_rated'] = 5.0
ATTRIBUTES['voltage_ac_operating'] = 0.05
ATTRIBUTES['voltage_dc_operating'] = 3.3
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes, _msg = Semiconductor.calculate_217f_part_stress(**_attributes)
assert isinstance(_attributes, dict)
assert _msg == ''
assert pytest.approx(_attributes['voltage_ratio'], 0.67)
assert _attributes['temperature_junction'] == 55.5
assert _attributes['lambda_b'] == 0.0034
assert _attributes['piQ'] == 1.0
assert _attributes['piE'] == 9.0
assert _attributes['piC'] == 2.0
assert pytest.approx(_attributes['piT'], 2.6196648)
assert pytest.approx(_attributes['piS'], 0.3778868)
assert pytest.approx(_attributes['hazard_rate_active'], 0.01781886)
def test_calculate_mil_hdbk_217f_part_stress():
"""calculate_mil_hdbk_217f_part_stress() should return a dictionary of updated values on success."""
ATTRIBUTES['hazard_rate_method_id'] = 2
ATTRIBUTES['environment_active_id'] = 4
ATTRIBUTES['subcategory_id'] = 10
ATTRIBUTES['insulation_id'] = 3
ATTRIBUTES['construction_id'] = 2
ATTRIBUTES['temperature_active'] = 32.0
ATTRIBUTES['temperature_rated_max'] = 85.0
ATTRIBUTES['quality_id'] = 2
ATTRIBUTES['power_rated'] = 5.0
ATTRIBUTES['power_operating'] = 1.5
ATTRIBUTES['voltage_rated'] = 250.0
ATTRIBUTES['voltage_ac_operating'] = 0.05
ATTRIBUTES['voltage_dc_operating'] = 15.0
ATTRIBUTES['resistance'] = 3.3E4
ATTRIBUTES['n_elements'] = 4
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes, _msg = Resistor.calculate_217f_part_stress(**_attributes)
assert isinstance(_attributes, dict)
assert _msg == ''
assert _attributes['power_ratio'] == 0.3
assert pytest.approx(_attributes['voltage_ratio'], 0.8901438)
assert pytest.approx(_attributes['lambda_b'], 4.2888845)
assert _attributes['piQ'] == 5.0
assert _attributes['piE'] == 8.0
assert _attributes['piC'] == 1.0
assert _attributes['piV'] == 1.1
assert _attributes['piR'] == 1.1
assert _attributes['piTAPS'] == 1.112
assert pytest.approx(_attributes['hazard_rate_active'], 293.7851584)
def test_voltage_overstress_mild_environment(power_rated,
environment_active_id):
"""overstressed() should return True when voltage ratio > 0.9 in a mild environment and False otherwise."""
ATTRIBUTES['power_operating'] = 0.47
ATTRIBUTES['temperature_rated_max'] = 150.0
ATTRIBUTES['temperature_active'] = 48.7
ATTRIBUTES['power_rated'] = power_rated
ATTRIBUTES['environment_active_id'] = environment_active_id
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes = Component.do_check_overstress(**_attributes)
assert isinstance(_attributes, dict)
if power_rated == 1.0:
assert not _attributes['overstress']
assert _attributes['reason'] == ''
elif power_rated == 0.5:
assert _attributes['overstress']
assert _attributes['reason'] == ('1. Operating power > 90% rated '
'power in mild environment.\n')
def test_temperature_overstress_harsh_environment(temperature_junction,
environment_active_id):
"""overstressed() should return True when junction temperature is >125C in a harsh environment and False otherwise."""
ATTRIBUTES['power_operating'] = 0.18
ATTRIBUTES['power_rated'] = 0.5
ATTRIBUTES['temperature_rated_max'] = 125.0
ATTRIBUTES['temperature_junction'] = temperature_junction
ATTRIBUTES['environment_active_id'] = environment_active_id
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes = Component.do_check_overstress(**_attributes)
assert isinstance(_attributes, dict)
if temperature_junction == 128.2:
assert _attributes['overstress']
assert _attributes['reason'] == ('1. Junction temperature > 125.0C '
'in harsh environment.\n')
elif temperature_junction == 28.7:
assert not _attributes['overstress']
assert _attributes['reason'] == ''
def test_voltage_overstress_harsh_environment(voltage_rated,
environment_active_id):
"""overstressed() should return True when voltage ratio > 0.6 in a harsh environment and False otherwise."""
ATTRIBUTES['voltage_ac_operating'] = 0.005
ATTRIBUTES['voltage_dc_operating'] = 15.0
ATTRIBUTES['temperature_rated_max'] = 125.0
ATTRIBUTES['temperature_active'] = 48.7
ATTRIBUTES['voltage_rated'] = voltage_rated
ATTRIBUTES['environment_active_id'] = environment_active_id
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes = Component.do_check_overstress(**_attributes)
assert isinstance(_attributes, dict)
if voltage_rated == 40.0:
assert not _attributes['overstress']
assert _attributes['reason'] == ''
elif voltage_rated == 20.0:
assert _attributes['overstress']
assert _attributes['reason'] == ('1. Operating voltage > 70% rated '
'voltage in harsh environment.\n')
def test_over_voltage(voltage_rated, environment_active_id):
"""overstressed() should return True when voltage < 0.95 rated in a harsh environment and False otherwise."""
ATTRIBUTES['current_operating'] = 0.005
ATTRIBUTES['current_rated'] = 0.01
ATTRIBUTES['voltage_ac_operating'] = 0.005
ATTRIBUTES['voltage_dc_operating'] = 4.95
ATTRIBUTES['voltage_rated'] = voltage_rated
ATTRIBUTES['environment_active_id'] = environment_active_id
ATTRIBUTES['temperature_junction'] = 89.4
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes = Component.do_check_overstress(**_attributes)
assert isinstance(_attributes, dict)
if voltage_rated == 5.0:
assert not _attributes['overstress']
assert _attributes['reason'] == ''
elif voltage_rated == 3.3:
assert _attributes['overstress']
assert _attributes['reason'] == ('1. Operating voltage > 105% rated '
'voltage.\n')
def test_temperature_overstress_harsh_environment(temperature_junction,
environment_active_id):
"""overstressed() should return True when hot spot temperature is within 15C of rated temperature in a harsh environment and False otherwise."""
ATTRIBUTES['current_operating'] = 0.18
ATTRIBUTES['current_rated'] = 0.5
ATTRIBUTES['voltage_rated'] = 5.0
ATTRIBUTES['voltage_ac_operating'] = 0.005
ATTRIBUTES['voltage_dc_operating'] = 4.95
ATTRIBUTES['temperature_rated_max'] = 125.0
ATTRIBUTES['temperature_junction'] = temperature_junction
ATTRIBUTES['environment_active_id'] = environment_active_id
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes = Component.do_check_overstress(**_attributes)
assert isinstance(_attributes, dict)
if temperature_junction == 28.7:
assert not _attributes['overstress']
assert _attributes['reason'] == ''
elif temperature_junction == 138.0:
assert _attributes['overstress']
assert _attributes['reason'] == ('1. Junction temperature > '
'125.000000C.\n')
def test_current_overstress_mild_environment(current_rated,
environment_active_id):
"""overstressed() should return True when current ratio > 0.9 in a mild environment and False otherwise."""
ATTRIBUTES['current_operating'] = 0.48
ATTRIBUTES['current_rated'] = current_rated
ATTRIBUTES['voltage_ac_operating'] = 0.02
ATTRIBUTES['voltage_dc_operating'] = 6.0
ATTRIBUTES['temperature_rated_max'] = 150.0
ATTRIBUTES['temperature_active'] = 48.7
ATTRIBUTES['voltage_rated'] = 15.0
ATTRIBUTES['environment_active_id'] = environment_active_id
_attributes = Component.do_calculate_stress_ratios(**ATTRIBUTES)
_attributes = Inductor.calculate_hot_spot_temperature(**_attributes)
_attributes = Component.do_check_overstress(**_attributes)
assert isinstance(_attributes, dict)
if current_rated == 1.0:
assert not _attributes['overstress']
assert _attributes['reason'] == ''
elif current_rated == 0.5:
assert _attributes['overstress']
assert _attributes['reason'] == ('1. Operating current > 90% rated '
'current in mild environment.\n')
