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_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_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_calculate_mil_217f_part_stress(category_id):
"""calculate() should return a dictionary of updated values on success when calculating 217F part stress."""
ATTRIBUTES['hazard_rate_method_id'] = 2
ATTRIBUTES['environment_active_id'] = 4
ATTRIBUTES['environment_dormant_id'] = 3
ATTRIBUTES['category_id'] = category_id
if category_id == 10:
for subcategory_id in [1, 2, 3, 4]:
ATTRIBUTES['subcategory_id'] = subcategory_id
_attributes, _msg = Component.calculate(**ATTRIBUTES)
else:
_attributes, _msg = Component.calculate(**ATTRIBUTES)
assert isinstance(_attributes, dict)
if category_id < 9:
assert _msg == ''
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_calculate_zero_mult_adj():
"""calculate() should return an error message when the multiplicative adjustment factor is <= 0.0."""
ATTRIBUTES['hazard_rate_method_id'] = 1
ATTRIBUTES['environment_active_id'] = 4
ATTRIBUTES['environment_dormant_id'] = 3
ATTRIBUTES['category_id'] = 1
ATTRIBUTES['mult_adj_factor'] = 0.0
_attributes, _msg = Component.calculate(**ATTRIBUTES)
assert isinstance(_attributes, dict)
assert _msg == ("RAMSTK WARNING: Multiplicative adjustment factor is 0.0 "
"when calculating hardware item, hardware ID: 6.\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')
def test_calculate_zero_quantity():
"""calculate() should return an error message when the quantity is < 1."""
ATTRIBUTES['hazard_rate_method_id'] = 1
ATTRIBUTES['environment_active_id'] = 4
ATTRIBUTES['environment_dormant_id'] = 3
ATTRIBUTES['category_id'] = 1
ATTRIBUTES['mult_adj_factor'] = 1.0
ATTRIBUTES['duty_cycle'] = 1.0
ATTRIBUTES['quantity'] = 0
_attributes, _msg = Component.calculate(**ATTRIBUTES)
assert isinstance(_attributes, dict)
assert _msg == ("RAMSTK WARNING: Quantity is less than 1 when calculating "
"hardware item, hardware ID: 6.\n")
def test_calculate_dormant_hazard_rate(category_id, subcategory_id,
environment_active_id,
environment_dormant_id):
"""calculate_dormant_hazard_rate() should return a dictionary of updated values on success."""
ATTRIBUTES['hazard_rate_active'] = 1.005887691
ATTRIBUTES['category_id'] = category_id
ATTRIBUTES['subcategory_id'] = subcategory_id
ATTRIBUTES['environment_active_id'] = environment_active_id
ATTRIBUTES['environment_dormant_id'] = environment_dormant_id
try:
if category_id == 2:
# [1, 2] = diodes, else transistors.
if subcategory_id in [1, 2]:
dormant_mult = (
DORMANT_MULT[category_id][environment_active_id]
[environment_dormant_id][0])
elif subcategory_id in [3, 4, 5, 6, 7, 8, 9]:
dormant_mult = (
DORMANT_MULT[category_id][environment_active_id]
[environment_dormant_id][1])
else:
dormant_mult = 0.0
else:
dormant_mult = DORMANT_MULT[category_id][environment_active_id][
environment_dormant_id]
except KeyError:
dormant_mult = 0.0
_attributes, _msg = Component.do_calculate_dormant_hazard_rate(
**ATTRIBUTES)
assert isinstance(_attributes, dict)
try:
assert _msg == ''
except AssertionError:
assert _msg == (
"RAMSTK ERROR: Unknown active and/or dormant environment "
"ID for hardware item. Hardware ID: 6, active "
"environment ID: {0:d}, and dormant environment ID: "
"{1:d}.\n").format(environment_active_id, environment_dormant_id)
assert _attributes['hazard_rate_dormant'] == (
ATTRIBUTES['hazard_rate_active'] * dormant_mult)