Engineering Change Notice (ECN) — Cassini Test Instrument Module (TIM)

ECN: RBEH-DRTVM4
Title: [Short, action-oriented summary of the change]
Originator: [Name, Title, Dept]
Date Submitted: [YYYY-MM-DD]
Change Type: [Minor / Major / Sustaining / Corrective / Obsolescence / Cost-Down]
Urgency: [Normal / Expedite / Stop-Ship]
Confidentiality: [Internal / Supplier-Shared]

• Module Name: Cassini TIM – [Instrument family / function]
• TIM Part Number (PN): [PN]
• TIM Assembly PN / Rev: [PN-ASM] / [Rev]
• Serial Numbers / Lots: [SNs / Lot IDs]
• Firmware / FPGA / Bitstream:
• FW: [Name] v[old] → v[new]
• FPGA/Bitstream: [ID] v[old] → v[new]
• Bootloader: [if applicable]
• Calibration Data: [Cal profile v[old] → v[new] / unchanged]
• Test Limits / Test Plan: [Doc-ID] v[old] → v[new]
• Mechanical/PCB/Connector: [PCB PN/Rev, Mech PN/Rev, Connector PN]
• Cables/Harnesses/Fixtures: [IDs and Revs]
• BOM Line Items Impacted:
• [RefDes / Component PN / Old Rev → New Rev] (LC/NC?)
• Software/Driver/SCPI Interface: [Driver pkg / API / SCPI command set changes]

• Issue / Driver: [Defect, performance drift, reliability, obsolescence, supply, safety, cost]
• Evidence / Data: [FA results, yield data, field returns, logs]
• Customer / Compliance Impact: [If any]

• Functional change: [What functionality or performance is added/removed/modified]
• Design change: [Schematics, layout, logic, HDL, timing, algorithm]
• Parameters / Limits: [Old spec → New spec with units and tolerances]
• Interfaces:
• Electrical: [Voltage/current ranges, impedance, timing]
• Mechanical: [Envelope, mounting, weight, connector keying]
• Software/API/SCPI: [New/removed commands, response formats, error codes]
• Documentation: [Docs to be revised and version increments]
• Backwards compatibility: [Yes/No — explain]

Form / Fit / Function (FFF):

• Form: [Enclosure, PCB outline, labels, ROHS markings]
• Fit: [Mounting holes, connector mating, harness length]
• Function: [Accuracy, resolution, bandwidth, noise, linearity, timing]

• Accuracy/Uncertainty: [Before → After, include guard-bands]
• Repeatability/Reproducibility: [Before → After]
• Latency/Throughput: [Before → After]

• Recalibration required? [Yes/No]
• Cal constants / method changes: [Describe]
• Calibration fixtures / standards impacted: [List]

• Regression tests impacted: [List test IDs]
• New tests required: [List, with acceptance criteria]
• Environmental/EMC/ESD/HiPot: [Required? Results if pre-run]

• Process/fixture changes: [Work instructions, ICT/JTAG, ATE sequences]
• Cycle time / throughput impact: [Δ minutes/part]
• Yields / scrap risk: [Estimate]
• Special tooling: [If any]

• Field-upgradeable? [Yes/No — steps or N/A]
• Swap criteria: [RMA thresholds / SN range]
• Downtime risk / mitigation: [Plan]

• AVL / AML updates: [Approved vendors, alternates]
• Availability / lead time: [Δ weeks]
• Cost impact (Unit / NRE): [+$/-$]
• End-of-Life / Last-Time-Buy: [If relevant]

• FMEA delta: [New failure modes, severity, occurrence, detection]
• HALT/HASS / Life test: [Needed? Status]
• Regulatory: [RoHS/REACH/CE/UKCA/UL/CSA/CB — impacts/unchanged]
• ESD / Latch-up / Over-voltage: [Mitigations]

• Interfaces: [USB, LAN, PXI, proprietary]
• Auth/Update signing: [Bootloader/firmware signing, rollback protection]
• Diagnostic/Debug ports: [Lockdown status]

Risk ID	Description	Likelihood	Impact	Mitigation / Contingency	Owner	Due
R1
R2

Effective Date / SN Break: [Date] / [First good SN: …] **Phased Rollout:**[Pilot → Limited → Full] **Manufacturing cut-in:**[WO/PO rules, rework vs scrap] **Field upgrade plan:**[Kits, instructions, time, tools] **Dependencies:**[Other ECNs/PCNs, material arrival, approvals] **Training:**[Ops, Quality, Service, Applications] **Communications:**[Internal bulletin, Supplier PCN, Customer notice]`

• Test matrix: [List required tests; link test script IDs]
• Acceptance thresholds: [Numeric criteria with units]
• Sample size & confidence: [e.g., n=30 @ C=0 AQL 0.65]
• Data storage / traceability: [MES/PLM record IDs]
• Sign-off gates: [Pilot pass, MRB exit, PQC sign-off]

• Schematics / PCB layout [Doc IDs → new rev]
• BOM & AML/AVL [BOM-### vX → vY]
• Mechanical drawings / STEP [IDs]
• Firmware/FPGA repos & release notes [Tags, hashes]
• Calibration procedures & certificates [Doc IDs]
• Manufacturing work instructions (WI/SOP) [IDs]
• Test procedures & limits [ATE scripts, limits files]
• User manual / datasheet / label artwork [IDs]
• PLM / ERP [Item/Rev status changes]
• Service docs / field bulletins [IDs]

• Raw/Kit/WIP: [Use as-is / Rework / Scrap]
• Finished Goods: [Rework criteria, quarantine rules]
• RMA / Field returns: [Segregation and rework path]

Role	Name	Signature / Date
Design Owner
Systems / Metrology
Manufacturing Engineering
Test Engineering
Quality / Reliability
Supply Chain / Sourcing
Compliance / Safety
Service / Field
Configuration Management (CM)
MRB Chair (if applicable)

• Updated schematics / layout diffs
• BOM delta report
• Firmware/FPGA release notes & binaries
• Calibration data / MSA report
• Test limit files & regression results
• FMEA update
• Costed BOM and AVL/AML updates
• Risk register & mitigation plan
• Customer notice / Supplier PCN (if external)

ECN No. / Title: …
Scope: [HW / FW / FPGA / Cal / Test Limits / Docs]
Why: …
What changes: …
Impacts:

• FFF: [✔/✖ + brief]
• Performance/Accuracy: [Δ]
• Calibration: [Req’d?]
• Manufacturing/Test: [Fixture/Script Δ]
• Field/Service: [Upgrade path]
• Cost/Lead time: [Δ]
  Cut-in: [Date / SN break]
  Acceptance: [Key tests + thresholds]
  Owners: [Design / Test / MFG / Quality]
  Approvals: [Blocks remaining]

• SCPI/API stability: Document any command additions, removals, or response format changes. Provide a compatibility shim if breaking changes are unavoidable.
• Calibration: If algorithms or measurement chains change (e.g., ADC path, filtering, linearization), recompute uncertainty and update cal procedures and certificates.
• FPGA/HDL: Include bitstream ID, synth tool version, and timing closure artifacts. Attach pre/post loopback and BIST results.
• Test Limits: If test plan or ATE scripts change, attach diffs and limit file versions; rerun regression across historical golden units.
• Labeling/Traceability: Ensure Rev, FW, and Cal versions are visible in self-test/*IDN? or equivalent identification commands for field traceability.