---
title: "Speedometer"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:SPEEDOMETER"
  data_integrity_hash: "a2afe1c83b1cafc1fbe8783d481e07f5"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:SPEEDOMETER"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/speedometer.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/speedometer"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-300 km/h with ±1.5% accuracy at 25°C ambient temperature"
    unit: "km/h or mph"
engineering_limits:
  max_safe_operating_point:
    value: 0.35
    unit: "Tesla"
    consequence: "Hall effect sensor voltage output nonlinearity due to magnetic saturation or semiconductor junction thermal breakdown at 150°C"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Electromagnetic interference from adjacent 400V AC motor windings generating 50 mV noise voltage"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Shielded twisted-pair cabling with 90 dB attenuation at 50-60 Hz and ferrite choke filtering"
  - node_2:
      trigger: "Vibration-induced fatigue at 200 Hz resonance frequency exceeding 5 g acceleration"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Conformal coating with silicone elastomer (Shore A 40 hardness) and vibration isolation mounting with 70% transmissibility reduction at 200 Hz"
bom_nodes:
  stepper-motor:
    type: "part"
    urn: "URN:CNFX:ME:STEPPER_MOTOR"
    interface_type: "physical-logic-coupled"
  printed-circuit-board-pcb:
    type: "part"
    urn: "URN:CNFX:ME:PRINTED_CIRCUIT_BOARD_PCB"
    interface_type: "physical-logic-coupled"
  dial-face:
    type: "component"
    urn: "URN:CNFX:ME:DIAL_FACE"
    interface_type: "physical-logic-coupled"
  needle:
    type: "component"
    urn: "URN:CNFX:ME:NEEDLE"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 2575:2010 (ROAD VEHICLES - SYMBOLS FOR CONTROLS, INDICATORS AND TELL-TALES)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/speedometer.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "b6eb93ebf90bd22b4bc9945b8738efe806fbb1d5cbbe207b642f15da4ec45b69"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Speedometer

## 1. Technical Definition
An instrument that measures and displays the instantaneous speed of a vehicle.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-300 km/h with ±1.5% accuracy at 25°C ambient temperature**. Failure boundary: **Hall effect sensor saturation at 0.35 Tesla magnetic flux density or 150°C operating temperature**, Mechanism: **Hall effect sensor voltage output nonlinearity due to magnetic saturation or semiconductor junction thermal breakdown at 150°C**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Electromagnetic interference from adjacent 400V AC motor windings generating 50 mV noise voltage | 8 | Hall effect sensor signal corruption causing 15% speed reading error | Shielded twisted-pair cabling with 90 dB attenuation at 50-60 Hz and ferrite choke filtering |
| Vibration-induced fatigue at 200 Hz resonance frequency exceeding 5 g acceleration | 8 | Solder joint fracture on PCB causing intermittent signal loss | Conformal coating with silicone elastomer (Shore A 40 hardness) and vibration isolation mounting with 70% transmissibility reduction at 200 Hz |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | km/h or mph | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Stepper Motor](https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/stepper-motor.md) `(Standalone System)`
- [Printed Circuit Board (PCB)](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/printed-circuit-board-pcb.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Calibration Equipment**, **Automated Assembly Line**, **Testing and Quality Control Station**  
**Downstream Applications**: Automotive Dashboard Assemblies, Motorcycle Instrument Clusters, Heavy Vehicle Control Panels  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are used in this speedometer's construction?
**A**: This speedometer features a durable plastic housing and dial, metal needle shaft and bezel, glass or polycarbonate lens, and electronic components including PCB and stepper motor for reliable performance.

### Q: How does the stepper motor contribute to speedometer accuracy?
**A**: The stepper motor provides precise needle movement by converting electronic signals from the vehicle's speed sensor into exact rotational positions, ensuring accurate real-time speed display without lag or drift.

### Q: What are the main components in the speedometer's BOM?
**A**: The bill of materials includes the dial face for speed markings, needle for visual indication, printed circuit board (PCB) for electronic control, and stepper motor for precise needle movement.

## 6. Manufacturing Compliance
- ISO 2575:2010 (ROAD VEHICLES - SYMBOLS FOR CONTROLS, INDICATORS AND TELL-TALES)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Speedometer](https://cnfx.com/industry/motor-vehicle-manufacturing/product/speedometer)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **4** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: SPEEDOMETER | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: ead82dbb
