---
title: "Rotary Function Switch"
industry: "Computer, Electronic and Optical Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:ROTARY_FUNCTION_SWITCH"
  data_integrity_hash: "75317d3cb64460d1c80b43af5d870880"
  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:ROTARY_FUNCTION_SWITCH"
  data_source_uri: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/rotary-function-switch.md"
  official_resource_url: "https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/rotary-function-switch"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-1000 cycles at 2 N·m torque, -20°C to 85°C ambient temperature"
    unit: "positions"
engineering_limits:
  max_safe_operating_point:
    value: 50
    unit: "m"
    consequence: "Contact wear due to fretting corrosion at silver-plated copper contacts under cyclic loading, exceeding Archard's wear coefficient K=2.5×10⁻⁵"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Dielectric breakdown at 500 VAC due to moisture ingress exceeding 85% RH"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Hermetic sealing with IP67-rated O-ring and vacuum impregnation of phenolic housing"
  - node_2:
      trigger: "Spring fatigue failure at 10⁶ cycles exceeding Goodman diagram limits for phosphor bronze (σ_a=350 MPa, σ_m=150 MPa)"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Shot peening treatment to induce 200 MPa compressive residual stress on spring surfaces"
bom_nodes:
  rotary-dial:
    type: "component"
    urn: "URN:CNFX:ME:ROTARY_DIAL"
    interface_type: "physical-logic-coupled"
  contact-assembly:
    type: "component"
    urn: "URN:CNFX:ME:CONTACT_ASSEMBLY"
    interface_type: "physical-logic-coupled"
  detent-mechanism:
    type: "component"
    urn: "URN:CNFX:ME:DETENT_MECHANISM"
    interface_type: "physical-logic-coupled"
  shaft-and-bearing:
    type: "component"
    urn: "URN:CNFX:ME:SHAFT_AND_BEARING"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
url: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/rotary-function-switch.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "2e56be2add39b7c9c6e3ffe91b3d8806743caec92d63ff3909ac24b15e0c1390"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Rotary Function Switch

## 1. Technical Definition
A mechanical selector switch used to change measurement functions on a portable digital multimeter.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-1000 cycles at 2 N·m torque, -20°C to 85°C ambient temperature**. Failure boundary: **Contact resistance exceeding 50 mΩ at 10 mA test current, rotational torque exceeding 5 N·m**, Mechanism: **Contact wear due to fretting corrosion at silver-plated copper contacts under cyclic loading, exceeding Archard's wear coefficient K=2.5×10⁻⁵**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Dielectric breakdown at 500 VAC due to moisture ingress exceeding 85% RH | 8 | Short circuit between adjacent switch positions causing measurement function cross-talk | Hermetic sealing with IP67-rated O-ring and vacuum impregnation of phenolic housing |
| Spring fatigue failure at 10⁶ cycles exceeding Goodman diagram limits for phosphor bronze (σ_a=350 MPa, σ_m=150 MPa) | 8 | Loss of detent positioning accuracy exceeding ±3° angular tolerance | Shot peening treatment to induce 200 MPa compressive residual stress on spring surfaces |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | positions | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Automated Assembly Line**, **Precision Stamping Press**, **Laser Marking Machine**  
**Downstream Applications**: Portable Digital Multimeters, Handheld Test Equipment, Industrial Measurement Devices  

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

### Q: What materials are used in this rotary function switch?
**A**: The switch features a thermoplastic housing for durability, metal alloy contacts and shaft for strength, and conductive gold or silver plating on contacts for optimal electrical performance.

### Q: How does the detent mechanism work in this switch?
**A**: The detent mechanism provides positive tactile feedback and secure positioning at each function setting, ensuring accurate and reliable measurement selection on digital multimeters.

### Q: What applications is this rotary switch designed for?
**A**: This switch is specifically engineered for portable digital multimeters in computer, electronic, and optical product manufacturing, where precise measurement function selection is critical.

## 6. Manufacturing Compliance

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### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Rotary Function Switch](https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/rotary-function-switch)**

### 🌐 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**: ROTARY_FUNCTION_SWITCH | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: af5de591
