Engineering Change Notice (ECN) — Cassini Test Instrument Module (TIM)
ECN: RBEH-DRU3HG
Title: RI8596A 25 GHz Receiver TIM Model No Longer Available For Sale
Change Type: [Minor / Major / Sustaining / Corrective / Obsolescence / Cost-Down]
Urgency: [Normal / Expedite / Stop-Ship]
1) Affected Configuration Items
- Module Name: Cassini TIM RI8596A 25 GHz Receiver
- TIM Part Number (PN): RI8596A
- Cassini Short Cut update may be required.
2) Reason / Problem Statement
- Issue / Driver: Supply constraints
- Customer / Compliance Impact: None - New Model is backward compatible with existing.
- Measurement Impact: None.
3) Change Description (What is changing?)
- Functional change: No functional change.
- Design change: Updated Module
- Parameters / Limits: No change
- Interfaces:
- Electrical: No Change.
- Mechanical: No Change.
- Software: Update may be required.
- Documentation: [Docs to be revised and version increments]
- Backwards compatibility: Yes
4) Impact Assessment
Form / Fit / Function (FFF):
- Form: No Change
- Fit: No Change
- Function: No Change
- Accuracy/Uncertainty: No Change
- Repeatability/Reproducibility:No Change
- Latency/Throughput: No Change
- Recalibration required? Yes
- Cal constants / method changes: No Change
- Calibration fixtures / standards impacted: No Change
- Regression tests impacted: Receiver
- New tests required: No Change
- Process/fixture changes: No Change
- Cycle time / throughput impact: No Change
- Yields / scrap risk: No Change
- Special tooling: No Change
- Field-upgradeable? Yes
- Swap criteria: [RMA thresholds / SN range]
- Downtime risk / mitigation: Plan Production Short Cut release
- AVL / AML updates: No Change
- Availability / lead time: [Δ12 weeks]
- Cost impact (Unit / NRE): +$
- End-of-Life / Last-Time-Buy: TBD / TBD
- 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]
5) Risks & Mitigations
Risk ID | Description | Likelihood | Impact | Mitigation / Contingency | Owner | Due |
| R1 |  | | | | | |
| R2 | | | | | | |
6) Implementation Plan
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]`
7) Verification & Acceptance Criteria
- 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]
8) Documentation & Systems to Update
- 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]
9) Disposition of Existing Stock / WIP / Returns
- Raw/Kit/WIP: [Use as-is / Rework / Scrap]
- Finished Goods: [Rework criteria, quarantine rules]
- RMA / Field returns: [Segregation and rework path]
10) Approvals
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) | | |
Attachments (check all that apply)
- 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)
Quick-Reference (One-Page Summary)
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]
Notes & Tips for Cassini TIMs
- 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.