electrostatic-dischargelisted

# Electrostatic Discharge (avionics/do160/electrostatic-discharge) Use when the task is DO-160 Section 25 electrostatic discharge (ESD) testing: selecting the equipment category and air discharge test level, computing stored energy and discharge waveform currents from the generator model, checking the discharge count per test point, and judging whether a surface is an applicable test point for personnel accessibility. ## Domain quick reference - DO-160G (RTCA, EUROCAE twin ED-14G) section 25 covers immunity of equipment to electrostatic discharge from personnel handling. - There is a single equipment category, A, tested at 15 kV air discharge on the equipment bonded to the ground plane. Worked: the category test level function returns 15.0 kV for category A and rejects any other category. - The discharge generator follows the IEC 61000-4-2 human-body model: 150 pF storage capacitance and 330 ohm discharge resistance. - Stored energy: E = 0.5 * C * V^2. Worked: 150 pF at 15 kV gives 0.5 * 150e-12 * (15e3)^2 = 0.016875 J (16.9 mJ); at 8 kV it gives 4.8 mJ. Energy scales with the square of the test voltage. - First peak current: 3.75 A/kV. Worked: 15 kV gives 56.25 A; 2 kV gives 7.5 A. - Current at 30 ns: 2 A/kV. Worked: 15 kV gives 30 A. Current at 60 ns: 1 A/kV. Worked: 15 kV gives 15 A. - Rise time window: 0.7 to 1.0 ns. Worked: 0.8 ns is valid; 0.5 ns and 1.2 ns are outside the window. - RC time constant: tau = R * C. Worked: 330 ohm and 150 pF give