I. Function Introduction

Digital items are standardized inspection units for numerical value entry, supporting:

• Numerical Entry: Precise input of measurement values
• Range Validation: Define qualified and valid value ranges
• Unit Management: Support multiple measurement units
• Risk Assessment: Automatically calculate risk levels

Core Value:

• Standardize numerical recording processes
• Ensure data accuracy
• Automatically determine qualified status
• Support trend analysis

Access Entry:

1. Administrator logs into management backend
2. Navigation menu select: 【Inspection Standards】→【Digital Items】

II. Add Digital Items

1. Single Addition

Operation Steps:

1. Click "New" button on toolbar

2. Fill in key information:
   • Basic Information:
     • Item Name (Required, e.g. "Voltage Measurement")
     • Measurement Unit (e.g. "V")
     • Decimal Places (0-4 digits)
   • Range Settings:
     • Qualified Value Lower Limit
     • Qualified Value Upper Limit
     • Valid Value Lower Limit
     • Valid Value Upper Limit
   • Risk Assessment:
     • Risk Factor (Associated risk type)
     • Qualified Score
     • Unqualified Score
   • Default Values:
     • Default Numerical Value
     • Category Name (Classification management)
3. Click "Save" to complete creation

2. Batch Import

Operation Steps:

1. Click "Import" button on toolbar

2. Download Excel template

3. Fill according to specifications:
   • Item Name
   • Measurement Unit
   • Decimal Places
   • Qualified Range (Min/Max)
   • Valid Range (Min/Max)
   • Risk Factor Code
   • Scores
4. Upload file and verify
5. Process import results

Template Specifications:

Column Name	Requirement	Example
Item Name	Unique, non-repeatable	Temperature Detection
Measurement Unit	Standard unit symbol	℃
Decimal Places	0-4	1
Qualified Value Lower Limit	Numerical value	18.0
Qualified Value Upper Limit	Numerical value	25.0
Valid Value Lower Limit	Numerical value	10.0
Valid Value Upper Limit	Numerical value	40.0
Risk Factor	Existing code	TEMP_001
Qualified Score	0-10 points	0
Unqualified Score	0-10 points	5

III. Modify Digital Items

Operation Steps:

1. Locate target digital item
2. Click "Edit" button in operation column
3. Modify:
   • Basic information (Name/Unit)
   • Range settings (Qualified/Valid range)
   • Risk assessment (Factor/Scores)
4. Click "Save" to submit

Precautions:

• Range setting modifications require revalidation of historical data
• Core digital items require approval for modification
• Unit changes need synchronization with associated items

IV. Delete Digital Items

Operation Steps:

1. Locate target digital item
2. Click "Delete" button in operation column
3. Confirm deletion operation

Restrictions:

• Cannot delete if referenced in inspection standards
• Cannot delete if historical records exist
• System core items are protected

V. Best Practices

1. Design Principles

• Naming Conventions:
  • Name ≤10 characters
  • Include measurement object (e.g. "Pressure Value")
  • Avoid ambiguous expressions
• Range Settings:
  • Qualified range ⊆ Valid range
  • Valid range should cover extreme values
  • Set reasonable tolerance
• Unit Management:
  • Use international standard units
  • Avoid unit conversion
  • Specify unit symbols clearly

2. Application Scenarios

Scenario Type	Digital Item Example	Unit	Qualified Range	Valid Range
Electrical Testing	Voltage Measurement	V	220±5%	0-250
Environmental Monitoring	Temperature Detection	℃	20-25	-10-50
Pressure Testing	Pipeline Pressure	MPa	0.8-1.2	0-2.0
Level Monitoring	Water Tank Level	m	1.5-2.0	0-3.0

VI. Precautions

1. Design Standards

• Range Validation:
  • Qualified range must be within valid range
  • Valid range should consider sensor measurement range
• Data Precision:
  • Decimal places should match instrument precision
  • Avoid excessive precision (≤4 digits)
• Risk Assessment:
  • Mild exceedance: 1-3 points
  • Moderate exceedance: 4-6 points
  • Severe exceedance: 7-10 points

2. Data Security

• Range modifications require dual confirmation
• Modification records permanently audited
• Exceedance data automatically alerted

3. Performance Optimization

• ≤10 digital items per inspection form
• Avoid complex calculation formulas
• Maintain unit consistency to avoid conversion