DS3 and DSZ3 Series Levels Testing

For the inspection of DS3 and DSZ3 series levels, key indicators including i-angle variation, i-angle error, effective aperture of telescope objective lens, transmittance coefficient, full-range error of micrometer, maximum measuring range of digital levels and compensator leveling error of automatic levels are accurately inspected in accordance with GB/T10156-2009 and other applicable standards. Scientific inspection methods are adopted to guarantee the measurement precision of levels applied in engineering surveying and topographic mapping, provide reliable metrological support for building construction, geological exploration and other works, and meet the accuracy requirements for surveying instruments from relevant industries.

Inspection Items

i-angle variation, i-angle error, effective aperture of telescope objective lens, telescope transmittance coefficient, full-range error of micrometer, maximum measuring range of digital levels, compensator leveling error of automatic levels

Inspection Standards

1. GB/T10156-2009 Levels, Clause 5.5

2. GB/T10156-2009 Levels, Clause 5.7

3. GB/T10156-2009 Levels, Clause 5.14

4. GB/T10156-2009 Levels, Clause 5.11

5. GB/T10156-2009 Levels, Clause 5.12

6. GB/T10156-2009 Levels, Clause 5.15

7. GB/T10156-2009 Levels, Clause 5.16

8. ISO 17123-3:2001 Optics and optical instruments - Field procedures for testing geodetic and surveying instruments - Part 3: Levels

Inspection Equipment

Level verification device, i-angle tester, telescope parameter tester, micrometer calibrator, length measuring device, leveling error tester, precision spirit level

Key Indicators and Inspection Requirements

1. Vial angular value: DS3 ≤15″/2mm, DSZ3 ≤8″/2mm

2. Line-of-sight axis error: ≤15″

3. Cross error: ≤15″

4. Leveling accuracy: ≤0.3mm/1m

5. Telescope resolution: ≥30″

6. Optical system: free of scratches, air bubbles and mildew spots

Inspection Methods and Implementation Points

1. Execute inspection per JJG 425-2003 Verification Regulation for Levels

2. Vial angular value test: use vial calibrator at 20℃±5℃

3. Line-of-sight axis test: collimator method or outdoor round observation method (≥3 observation rounds)

4. Leveling accuracy test: measure residual error with the verification device

5. Resolution test: conduct observation via resolution test plate

6. Optical quality test: visual inspection aided by a magnifier

Precautions

1. Ambient conditions: 20℃±5℃, RH≤85%

2. Keep the instrument at constant temperature for no less than 2 hours

3. Clean all optical components before testing

4. Ensure the inspection platform is stable and vibration-free

5. Apply temperature correction to test data

6. Issue a formal verification certificate after inspection