StandardZhuo SP-300 Horizontal Level Zero-Position Calibration System
| Brand | StandardZhuo |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | SP-300 |
| Price | Upon Request |
| Measurement Range | 0–300 mm |
| Worktable Flatness | 3.5 µm over 760 × 200 mm |
| Standard Mandrel Linearity (Straightness) | ≤1.2 µm |
| Standard Mandrel Parallelism to Reference Axis | ≤1.4 µm |
| Parallel Rule Parallelism | ≤1.4 µm |
| Parallel Rule Flatness | ≤1 µm |
| Parallel Rule Mounting Perpendicularity | ≤2 arcseconds |
| Standard Mandrel Mounting Perpendicularity | ≤2 arcseconds |
| Dimensions (L×W×H) | 760 × 328 × 600 mm |
| Weight | ~190 kg |
Overview
The StandardZhuo SP-300 Horizontal Level Zero-Position Calibration System is a precision metrological instrument engineered for the absolute calibration of zero-position error in frame-type and bar-type spirit levels—specifically those with measuring lengths up to 300 mm. It implements a dual-position differential measurement methodology: two sequential angular readings are acquired—first with the level placed in its nominal orientation on the calibrated parallel rule, then rotated 180° about its longitudinal axis—and the arithmetic mean of their difference yields the zero-error offset. This method eliminates systematic errors from the reference surface and fixture geometry, delivering traceable, high-reproducibility results compliant with JJF 1084–2002, the Chinese national metrological calibration specification for frame and bar levels. The system’s core mechanical architecture integrates a grade-0 granite worktable (760 × 200 mm), precision-ground bearing steel mandrels and parallel rules, and a rigid cast-iron support frame—all thermally stabilized and vibration-damped to ensure long-term dimensional stability under laboratory conditions.
Key Features
- Traceable dual-position absolute measurement principle per JJF 1084–2002, eliminating reliance on external angle standards
- Granite worktable with flatness ≤3.5 µm over 760 × 200 mm, providing stable, low-thermal-expansion reference surface
- Hardened and lapped steel mandrel with linearity ≤1.2 µm and mounting perpendicularity ≤2″, ensuring accurate rotational axis definition
- Parallel rule manufactured from stabilized tool steel, featuring flatness ≤1 µm and parallelism ≤1.4 µm relative to the mandrel axis
- Modular V-block and adjustable leveling feet enabling precise horizontal alignment and repeatable part positioning
- Robust cast-iron base structure with integrated damping, minimizing dynamic perturbations during measurement cycles
Sample Compatibility & Compliance
The SP-300 accommodates frame levels and bar levels with base lengths ≤300 mm, including both traditional vial-based instruments and modern digital inclinometers requiring mechanical zero verification. It supports calibration of individual spirit vials mounted on test fixtures or embedded in composite level bodies. All mechanical tolerances—including mandrel straightness, parallel rule flatness, and angular mounting accuracy—are verified against ISO 10360-2 (coordinate measuring machines) and GB/T 24634–2009 (geometric accuracy of granite surfaces). The system is designed for use in accredited metrology laboratories operating under CNAS-CL01 (equivalent to ISO/IEC 17025) and supports full documentation traceability required for GLP/GMP environments.
Software & Data Management
While the SP-300 operates as a manual mechanical comparator, it is fully compatible with external digital readout systems—including high-resolution electronic autocollimators (e.g., Thorlabs ACL250 series) and optical encoder-based angular sensors—via standardized mounting interfaces (M6 tapped holes, Ø12 mm alignment dowels). Measurement data can be recorded using validated laboratory information management systems (LIMS) or Excel-based calibration worksheets adhering to ISO/IEC 17025 clause 7.7 (results reporting). Audit trails, operator identification, environmental condition logging (temperature, humidity), and uncertainty budgets may be generated in accordance with GAMP 5 guidelines and FDA 21 CFR Part 11 requirements when paired with compliant software platforms.
Applications
- Primary calibration of frame and bar levels in national metrology institutes and third-party calibration labs
- Zero-position verification and adjustment of precision machinist levels used in CNC machine tool setup and coordinate measuring machine (CMM) alignment
- Quality control testing of spirit-level manufacturing lines, supporting ISO 9001 clause 7.1.5 (monitoring and measuring resources)
- Verification of angular reference artifacts prior to use in interferometric or laser tracker-based alignment workflows
- Educational demonstration of fundamental angular metrology principles—including Abbe error compensation and reversal techniques—in university metrology laboratories
FAQ
What standards does the SP-300 comply with?
It conforms to JJF 1084–2002 and incorporates geometric tolerances aligned with ISO 10360-2, GB/T 24634–2009, and ISO 230-1 for machine tool acceptance testing.
Can the SP-300 calibrate digital electronic levels?
Yes—it provides a mechanical zero-reference platform; users integrate compatible angular sensors (e.g., autocollimators) to digitize readings for electronic level verification.
Is temperature compensation built into the system?
No—the SP-300 is a passive mechanical standard; users must control ambient temperature per JJF 1084–2002 (20 ± 2 °C) and apply material-specific thermal expansion corrections if operating outside nominal conditions.
What maintenance is required?
Annual verification of granite surface flatness and mandrel straightness by an accredited metrology lab; periodic cleaning of ground steel components with isopropyl alcohol and light mineral oil application to prevent corrosion.
Does the system include calibration certificates?
A factory-as-tested report is supplied; NIST-traceable calibration certificates (including uncertainty budgets) are available upon request through authorized calibration service partners.
