Claude Skills by ashfordeOU

Verify that a current limiter holds its output inside the defined minimum and maximum protection thresholds. Use when ECSS-E-ST-20-20C clause 5.2.3.1.1 asks a limiter design to prove the limitation current never leaves that window: stack the setpoint contributors — initial setting, temperature, reference drift, ageing, total dose, sense offset — arithmetically or by root-sum-square, build the worst-case limitation range around the nominal setpoint, compare both edges with the thresholds, conf...

Audit the output-current telemetry provision of ECSS-E-ST-20-20C clause 5.2.8.2.1. Use when every limiter in a distribution unit has to put the current it delivers into the housekeeping stream and that provision must be shown complete and worth reading: confirm one dedicated channel per limiter, reject a channel that sums several outputs, check the full scale spans the limitation current with headroom, check the quantisation step resolves the load change the mission needs to see, sum the offs...

Verify the device voltage drop at which an output-impedance dataset was measured and reported, under ECSS-E-ST-20-20C clause 5.2.17.2.1. Use when a characterisation has to name its bias point instead of leaving the operating condition implicit: refuse a drop larger than the bus feeding it, take the declared drop against the reference bias point, compare it with the drop the reported load current and series resistance imply, hold it inside the device operating window, take the implied dissipat...

Evaluate the output-impedance dataset delivered for each protection-device class against the frequency band the project specified, under ECSS-E-ST-20-20C clause 5.2.17.1.1. Use when gain and phase have to arrive as a reviewable characterisation rather than a plot: refuse a descending or repeated frequency, convert between ohms and dB-ohm, require the sweep to reach both band edges, hold a points-per-decade floor and a largest step between adjacent frequencies, bound the reported phase, report...

Evaluate whether a limiter switches off inside its tabulated trip-time window, per ECSS-E-ST-20C clause 5.2.4.1.1. Use when measured or simulated switch-off times have to be judged against the whole table rather than one nominal delay: form the overcurrent ratio against the declared limit, bracket it between tabulated rows, interpolate the minimum and maximum permitted times, hold the last row past the end of the table, and categorize every event as too fast to ride a legitimate inrush, insid...

Compute the current overshoot that appears at the input and the output of a power supply interface when an overload arrives, and bound it. Use when clause 5.4.1.1.1 of ECSS-E-ST-20-20C is assessed: take the limitation value, the overload onset and the sampled waveform of each port, read each peak as a factor on the limitation value, integrate the time the current stays above it with interpolated crossings rather than whole sample intervals, compare both ports against the permitted factor and ...

Verify that every latching current limiter in a parallel group takes its on command and its off command from one shared line, per clause 5.2.12.4.1 of ECSS-E-ST-20-20C. Use when a paralleled group has to switch as one device rather than as neighbours: resolve the on-command and off-command source each member is bound to, refuse a member left naming no source at all, grade the two lines apart so a shared turn-on with a split turn-off is caught, and measure the spread of arrival delays across t...

Evaluate how paralleled latching and high power limiters divide a load current between them, and whether the branch taking the largest share keeps enough headroom to its own threshold, per clause 5.2.12.2.1 of ECSS-E-ST-20-20C. Use when a group carries a load together and no branch may trip off unexpectedly: turn measured branch currents into share fractions, measure the worst branch above the equal share, flag a starved branch the redundancy was sized on, and find the load at which the first...

Verify that the current telemetry of a paralleled limiter group reports the total current the group is passing, per clause 5.2.12.5.1 of ECSS-E-ST-20-20C. Use when one reading has to stand for several limiters at once: sum every member into the group total, name a member the aggregation was never told about, decide whether a full scale sized for a single member now saturates on the group, combine the member sensing errors into the error on the reported total, and keep a saturated range apart ...

Assess whether a proposed parallel group of latching and high power limiters sits inside the allowance to wire such limiters in parallel, per clause 5.2.12.1.1 of ECSS-E-ST-20-20C. Use when several limiters feed one load together: hold the group to one limiter family and one part reference, measure how far the member limiting thresholds spread apart, check the members are switched as one and read back individually, refuse a retriggerable or foldback device this allowance never covered, and co...

Determine when a group of paralleled latching and high power limiters trips off as a whole, and whether the current the first member sheds is what carried the rest over their own thresholds, per clause 5.2.12.3.1 of ECSS-E-ST-20-20C. Use when the combined trip time of a parallel group decides an unintended disconnection: take each member trip time from its own branch current, redistribute the shed current across the members still conducting, walk the cascade event by event, and test the group...

Allocate every power-bus perturbation immunity requirement to the verification level that can actually reproduce it, under ECSS-E-ST-20-20C clause 5.2.16.2.1. Use when a protection-device immunity list has to be split between unit-level bench testing and spacecraft-level testing instead of deferred whole: refuse an inverted frequency band or a repeated identifier, send to spacecraft level anything needing the flight harness, the real bus source impedance or cross-user coupling, keep the rest ...

Evaluate a protection-device application against the baseline assumptions of ECSS-E-ST-20-20C clause 4.2. Use when a latching current limiter is reused outside the host unit qualification temperature range and the power bus behaviour its requirements were written on: refuse an unstated, inverted or self-contradictory baseline, take the cold, hot, low-voltage and high-voltage margins one by one, admit an application landing exactly on a bound, name the limiting margin, and raise an advisory fo...

Determine whether a protection device operates correctly across the reference power bus of ECSS-E-ST-20-20C clause 5.1. Use when a latching current limiter has to be shown compatible with the bus it will sit on: refuse a specification whose transient envelope is narrower than its steady band, build the worst-case high and low instantaneous voltages from the steady limits, the ripple and the transient excursions, compare every device operating window against them, check the transient duration ...

Evaluate whether the bench source feeding a load tested on its own really represents the limiter the unit will fly behind. Use when a standalone load test is set up against ECSS-E-ST-20-20C clause 5.3.4.1.1: compare the bench limit value, trip-off delay, series impedance and inductance and undervoltage threshold with the flight branch, match the latching and retrigger character exactly, recognise a hard laboratory supply that can never enter limitation, and state whether the resulting evidenc...

Determine whether a retriggerable limiter comes up with its retrigger behaviour already active, under ECSS-E-ST-20-20C clause 5.2.6.3.1. Use when a power design declares a power-up default and that declaration has to be checked against evidence: refuse an undeclared default, require every restarting event the project names rather than cold power-up alone, fail a restart that carries the pre-event state across instead of defaulting, and compare the time each restart needs to put the default in...

Evaluate whether a retriggerable limiter really lets its automatic retrigger behaviour be switched off and switched back on, under ECSS-E-ST-20-20C clause 5.2.6.2.1. Use when a power design claims retrigger is commandable and that claim has to become a verdict: refuse a design declaring no control, reject a one-way inhibit that can never be put back, name every required command path that cannot reach the control, require a state read-back, and compute the worst-case settling time between a di...

Verify that a latching current limiter tolerates the reverse current peak its channel will actually see, per clause 5.4.1.2.1 of ECSS-E-ST-20-20C. Use when a reverse current capability is called for and a bus transient, a capacitive discharge or a reversed load has to be graded before the rating is frozen. Derive the tolerated peak from the nominal limitation current and the rated peak multiple, derate it for a pulse longer than the rated duration and for repeated events, compare the applied ...

Verify that a power outlet tolerates the current its load pushes back in both the conducting and the latched-off state, for ECSS-E-ST-20-20C clause 5.2.11.1.1: derive the recommended withstand level per state from the rated output current, convert the reverse pulse shape into charge, absorbed energy and repetitive rms current, raise the output-node excursion the charge drives into the holdup capacitance, then grade each state separately against its declared withstand peak, duration and overvo...

Evaluate which retriggerable current limiter class a protected load belongs on. Use when an ECSS-E-ST-20-20C clause 5.2.2.1.1 power design has to take an RLCL class from the project class table and show its performance figures hold under repeated retriggering: derate the continuous rating, form the worst-case retrigger duty from the longest trip-off delay against the shortest hold-off, compare the resulting mean fault current with the harness thermal rating and the per-attempt fault energy wi...

Determine whether a retriggerable latching current limiter stays off through a brief bus excursion. Use when an ECSS-E-ST-20-20C clause 5.4.4.3.1 enable design has to be shown sound: validate the enable and release points with their hysteresis, interpolate the crossings of a sampled bus trace to measure how long each excursion really dwells above the enable point, grade every nuisance excursion and every genuine request against the confirmation time, then report the feasible confirmation wind...

Verify component derating in a retriggerable limiter holding current limitation, per ECSS-E-ST-20C clause 5.2.3.5.1. Use when a latching current limiter must be shown safe through a sustained limitation event and not only in steady conduction: take the upper bus voltage with the upper edge of the limitation band, collapse the output onto the faulted load, divide the differential across the series parts, choose peak or duty-averaged power per part from its thermal time constant, raise junction...

Assess whether a retriggerable current limiter comes up conducting on every occasion bus power becomes available, per clause 5.2.7.1.1 of ECSS-E-ST-20-20C. Use when a channel's power-up state has to hold for a cold start, a brown-out recovery, an undervoltage recovery, a bus reset and a commanded power cycle alike: refuse a turn-on that waits on an enable telecommand, catch an occasion nobody declared, time the output against its turn-on budget, and bound the retrigger cycle so a still-faulte...

Assess whether a retriggerable latching current limiter holds its derating limits through an autonomous retrigger train, for ECSS-E-ST-20-20C clause 5.2.10.2.1: form the retrigger duty cycle from the limitation and off intervals, settle a single-pole junction model over the repeating train, count the retriggers a persistent fault produces inside the declared window, then solve the shortest off time and the highest duty cycle that still hold the junction limit and grade average dissipation and...

Evaluate whether a retriggerable limiter puts itself back into the conducting state after an unintended switch-off, under ECSS-E-ST-20-20C clause 5.2.18.1.1. Use when a power chain has to show that recovery is automatic and bounded: refuse a return to conduction that waits on a command, count the retrigger cycles a disturbance of a given length forces, build the recovery latency from detection, open interval and turn-on ramp, and weigh it against the hold-up the load actually has. Reach for i...

Verify the switch-on response of a retriggerable latching current limiter against a stepped input. Use when an ECSS-E-ST-20-20C clause 5.4.4.4.1 test steps the bus from below the enable point up to nominal and has to prove what the output did: check the start point, the landing point, the settled dwell and the sharpness of the edge, time the delay from the interpolated input crossing to the output reaching its declared fraction of the regulated level, grade every run against both ends of the ...

Verify that one failure disables at most one protected distribution line, per clause 5.2.15.1.1 of ECSS-E-ST-20-20C. Use when a single-point-failure argument has to be read failure by failure rather than box by box: enumerate the protected lines, attach every declared failure point to the lines it actually takes down, refuse a line-local point that reaches past its own line, count the fan-out a shared drive, command path, return or source stage produces, and rank a protected line nobody trace...

Assess whether a device holds its commanded state through electromagnetic disturbance, radiation events and similar perturbations, per clause 5.2.16.1.1 of ECSS-E-ST-20-20C. Use when an immunity claim has to cover every perturbation that can flip a latch and not only the one that was tested: turn each declared environment and demonstrated immunity into a level margin, separate a provision that prevents a flip from one that merely restores state afterwards, hold a restoring provision against t...

Evaluate whether a unit holds its output-current rise inside the declared turn-on slew ceiling, per ECSS-E-ST-20C clause 5.4.2.1.1. Use when turn-on traces from several worst-case corners have to be judged rather than one nominal switch-on: validate the time base, slope every segment, take the steepest rising stretch rather than the final current over the total rise time, compare it with the ceiling at inclusive equality, carry the relative headroom, and flag a trace sampled too coarsely to s...

Evaluate whether a current limiter starts up correctly and stays inside its own ratings when an overload or a short circuit is already sitting on its output, under ECSS-E-ST-20C clause 5.2.7.5.1. Use when a power distribution unit is assessed against a declared downstream fault set: solve the start up operating point at the top of the current limit accuracy band, split the bus between the fault and the pass element, carry the dissipation into a junction temperature and into the energy held ov...

Evaluate the voltage pulse an output throws while the main bus powers up, against clause 5.4.2.4.1 of ECSS-E-ST-20-20C. Use when a recorded start up capture has to show the excursion stays inside its declared amplitude limit rather than merely settling eventually: average the tail for the settled output, refuse a tail still moving, open the excursion window at the first arrival at that value so the ramp is not read as an undershoot, take the largest departure each way, widen each by the probe...

Determine how long an output stays away from its settled value while the main bus powers up, against clause 5.4.2.5.1 of ECSS-E-ST-20-20C. Use when a start up capture has to bound the excursion in time and not only in amplitude: centre a permitted band on the settled output, open the window where the ramp finishes, place both band crossings by interpolating across the crossing segment rather than counting whole samples, absorb re-entries shorter than the declared dead time into one event, fla...

Audit whether the faulted start up evidence for a current limiter reaches both of the ways a start up is triggered, a commanded turn on and a rise of the main bus voltage, under ECSS-E-ST-20C clause 5.2.7.6.1. Use when a verification case set is assessed for completeness: fold each declared trigger onto one of the two routes, build the matrix of declared fault conditions against both, credit a cell only to a case that ran and passed, and name a condition evidenced on one route alone as the ga...

Verify that a current limiter's actual state and its reported status both track the intended state through main bus start up and through recovery from zero volts, under ECSS-E-ST-20C clause 5.2.7.4.1. Use when a power distribution unit is assessed against a recorded start up profile: establish the window in which the limiter control logic has a guaranteed supply, hold samples below that floor as indeterminate rather than as agreement, find every zero volt excursion and require the declared de...

Assess whether the true state of a device stays readable once its command interface has failed, the independence requirement of ECSS-E-ST-20-20C clause 5.2.9.1.1. Use when a status acquisition architecture has to be judged rather than assumed: separate the paths that sense the achieved device state from the ones that only replay the ordered state, intersect each sensing path with the command chain and the command power domain, categorize every path as independent, shared or command-derived, c...

Assess whether a limiter's reported state confirms its output voltage, per ECSS-E-ST-20-20C clause 5.2.8.1.1. Use when a housekeeping bit has to mean the rail is inside its nominal band rather than that a command was accepted: build the band from the nominal and its tolerances, check the sense thresholds sit inside that band with workable hysteresis, derive the state the sense chain would report for the measured output, group the reported bit as on-confirmed, on-unconfirmed-under, on-unconfir...

Verify the steady load current of a switched line stays below the class current once the line is on. Use when ECSS-E-ST-20-20C clause 5.3.1.1.1 asks a load to show its post-switch-on consumption never reaches the limiter class current: convert every operating mode to amperes at both ends of the bus voltage window, remembering a constant-power load draws hardest at the lowest bus, carry the heaviest mode forward, stack the one-sided consumption uncertainties arithmetically or by root-sum-squar...

Verify that the switching element of a power distribution protection device sits on the energised main bus side. Use when an LCL, HLCL or latching relay branch is reviewed against ECSS-E-ST-20-20C clause 5.2.3.2.1: order the branch from main bus along the energised rail through the load and back to the bus return, confirm the pass element precedes everything it protects, list what stays tied to the bus once it opens, name any reachable connector or harness left live, size the energised stub a...

Evaluate whether a limiter switch stuck in the on state is paid for by the spacecraft power budget where no further switching can open the channel, per clause 5.2.13.1.1 of ECSS-E-ST-20-20C. Use when a channel has no second means of isolation: decide which provisions genuinely shed a stuck-on load and which only add a second path into it, turn the stuck-on current into continuous power at bus voltage, charge only what the failure adds over the draw already budgeted, take the worst single chan...

Evaluate whether a unit holds its output-current fall inside the declared switch-off slew ceiling, per ECSS-E-ST-20C clause 5.4.2.2.1. Use when a turn-off trace has to answer two questions at once: the steepest collapse against the declared ceiling, and the transient that same rate drives across the harness inductance against the bus allowance. Validate the time base, rate every segment, take the abrupt let-go rather than the mean decay, convert it into an induced volt, judge both at inclusiv...

Verify a turn-on current profile exceeds the class current only while the input filter is charging. Use when ECSS-E-ST-20-20C clause 5.3.2.1.1 asks a switch-on transient to be justified rather than merely observed: group every profile segment above the class current by its declared cause, reject an excess not attributable to input-filter charging, charge the filter at the current left over once the steady load is served, confirm the whole excess finishes inside the shortest trip-off delay wit...

Evaluate the load points a current telemetry accuracy verification actually exercises against the ones ECSS-E-ST-20-20C clause 5.2.8.7.1 expects, and name what the test programme would leave unproven. Use when a proposed current telemetry test matrix has to be accepted or sent back: match every proposed point against the required fractions of full scale inside a stated tolerance, carry each declared mission load current as a required point of its own, refuse a point outside the channel range,...

Verify that an undervoltage protection opens both the main switch and the extra switch of a current limiter, each through a memory cell of its own, under clause 5.2.13.5.1 of ECSS-E-ST-20-20C. Use when one detection chain has to latch two series switches off and the two command paths share parts. Walk each path element by element, confirm every switch holds its open state in its own cell, name any memory or drive element the two paths hold in common, and run a single failure walk reporting wh...

Evaluate the blanking time that lets an undervoltage protection ignore a short dip below its trip threshold, against clause 5.4.3.3.1 of ECSS-E-ST-20-20C. Use when a unit declares a time below the threshold that has to elapse before a trip is issued and that figure has to be shown to sit in a real window. Build the lower bound from the longest transient the bus is allowed to impose, build the upper bound from the hold-up the load can ride out less the detection and switching latency, and repo...

Verify the minimum width between the undervoltage trip point and the enable point of a protection function, per clause 5.4.3.5.1 of ECSS-E-ST-20-20C. Use when a unit declares both thresholds and the separation still standing after setting tolerance has to be shown. Take the declared separation, erode it by the tolerance of each comparator, express it against the nominal bus, and compare that worst case with the minimum the project requires. Report a design carrying no hysteresis at all as out...

Validate a noise immunity test that applies a defined voltage step to show an undervoltage trip does not react to bus noise, per clause 5.4.3.4.1 of ECSS-E-ST-20-20C. Use when a test specification has to be shown to demonstrate immunity rather than merely avoid a trip. Size the step from the declared noise and ripple envelope, check that the level before and after it both stay clear of the trip band so the step is a disturbance and not a genuine undervoltage, require a dwell that outlasts the...

Evaluate the hysteresis designed into an undervoltage protection trip against clause 5.2.5.2.1 of ECSS-E-ST-20-20C. Use when a power distribution unit declares an undervoltage drop-out threshold and a re-arm threshold and the band between them has to be judged. Derive the hysteresis band and its fraction of the trip point, build the disturbance envelope from bus ripple, sensing uncertainty and transient droop, and decide whether the band clears it. Treat the band as mandatory for a retriggera...

Audit a power bus for the input undervoltage protection each limiter carries, per ECSS-E-ST-20C clause 5.2.5.1.1. Use when the provision has to be shown to hold over every limiter and each function shown to be placed usefully rather than merely present: count the population first, then check the trip threshold sits below the steady-state band yet above the limiter's own operating floor, that threshold plus hysteresis gives a recovery level the bus can still reach, that the hysteresis clears t...

Verify that a ground adjustable undervoltage trip point is expressed against the maximum direct current bus voltage, per clause 5.4.3.2.1 of ECSS-E-ST-20-20C. Use when a unit declares its undervoltage threshold as a fraction of a bus voltage and the reference, the adjustment ladder and the resulting window all have to be shown. Refer every settable fraction back into volts through the maximum bus voltage, walk the ladder from its lowest setting to its highest, and test each point against the ...

Verify that a ground adjustable undervoltage trip point covers its required span when expressed against the nominal bus value, per clause 5.4.3.1.1 of ECSS-E-ST-20-20C. Use when a unit declares a ladder of trip points as shares of nominal and the settable span has to be judged rather than one figure: convert each share to volts at the nominal bus, widen it by reference and sensing tolerance, keep only settings whose band clears the lowest normal bus voltage and stays above the equipment opera...