LV 123

LV 124 is a quality and reliability test standard jointly established by German automotive manufacturers in 2013. This standard covers tests for electric and electronic components for use in motor vehicles  The standard consists of Part I: electrical requirements and tests and Part II: environmental requirements and tests. LV 124 is required for all supplies of German OEMs. Espec provides products that perform tests that are unique to LV124, including condensation tests with assemblies and life/temperature cycle tests. Voltages and currents VN Nominal voltage VBmin Lower operating voltage limit VB Operating voltage VBmax Upper operating voltage limit Vmax Maximum voltage that may occur during a test Vmin Minimum voltage that may curry during a test VPP Peak-peak voltage Veff RMS value of a voltage Vtest Test voltage IN Nominal current GND Device ground VA, VT, VS, VR Voltage level of the start voltage pulse   Times/durations tr Rise time (e.g., of a voltage curve) tf Fall time (e.g., of a voltage curve)   Temperatures Tmin Minimum operating temperature TRT Room temperature Tmax Maximum operating temperature Ttest Test temperature   Tolerances & Standard Values Frequencies ±1% Temperatures ±2 °C Humidity ±5% Times/durations +5%; 0% Voltages ±2% Current ±2% Room Temperature TRT = 23 °C ± 5 °C Humidity Hrel = 25% to 75% relative humidity Test Temperature Ttest =

LV 148 Standards are written for electric and electronic components for vehicles with a 48V Electrical System. This standard details a series of procedures for a test involving electrical normative bases and addressing the practical challenges for vehicle components and systems. LV 148 covers electric and electronic components for vehicles within a 48V electrical system's test conditions. Topics and tests covered include tolerances, operating voltage ranges, and other standard values and specifications. With an increasing amount of completely electric vehicles manufactured every year, the LV 148 will remain relevant in the coming decades to ensure standards. There are two main test setups LV 148 applies for voltage simulations and voltage dropouts. Test setup for voltage simulation DC source Signal generator Auxiliary equipment Measuring devices Test setup for voltage dropouts DC source Electronic switch Signal generator Auxiliary equipment Measuring devices In addition, the LV 148 standards apply to ground offset, short circuit signal and power line, standby current, the ground lost, internal dielectric strength, operations with/without functional limitation, over-voltage range, and under-voltage range tests.   Tolerances & Standard Values Frequencies ±1% Temperatures ±2 °C Humidity ±5% Times/durations +5%; 0% Voltages ±0.5% Currents ±2% Room Temperature TRT = 23 °C ± 5 °C Humidity 25 % (+ 5 % bis 0 %) to 75 % (- 5 % bis 0 %) Test Temperature Ttest = TRT Operating Voltage U48max Source Impedance 10 mOhm ≤ Ri ≤ 100 mOhm   Terms A, B, C, D in Diagrams Functional status A, B, C,