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Precision Weighing Inspection for Equipment Calibration and Accuracy Verification
1.Precision Weighing Inspection is a critical process for evaluating and maintaining the performance of weighing equipment. Unlike standard weighing, this inspection focuses on the systematic verification of
a scale's accuracy, repeatability, and linearity to ensure it meets stringent technical and regulatory standards. This is a fundamental requirement for laboratories, quality control departments, and any industry where exact measurements are non-negotiable.
2.The Core of the Process
The primary goal is to determine if a scale's measurements are consistently correct over its entire range. This is achieved through a structured procedure that includes:
2. 1 Equipment Calibration: This is the foundational step where a technician adjusts the scale's internal settings to align its measurements with a known standard. Calibration is performed using certified, traceable reference weights (also known as test weights). The scale is adjusted to read the exact value of these weights at multiple points, correcting for any mechanical or electronic drift. Calibration is not just a check; it's a corrective action that brings the equipment back into its specified performance.
2. 2 Accuracy Verification: After calibration, accuracy verification confirms that the scale is now functioning correctly. This is done by weighing a different set of certified weights—not the ones used for calibration—and comparing the scale's displayed value to the known mass of the weights. A passing result confirms that the scale can provide a true measurement.
2.3 Repeatability and Reproducibility (R&R) Testing: This test measures the scale's ability to provide the same result under the same conditions. It involves weighing the same item multiple times to check for variations. A high degree of repeatability is crucial for processes that rely on consistent measurements. This test also helps identify random errors caused by environmental factors or mechanical issues.
Specifications:
| Parameter | Specifications |
| Resolution | 0.1g - 1kg: 0.001g |
| Accuracy Class | Class I (0.001%) |
| Repeatability | ±0.005% of capacity |
| Linearity Error | ±0.01% of reading |
| Internal Calibration | Automatic (motorized) |
| External Calibration | Manual weight set |
| Calibration Interval | Quarterly |
| Temperature Stability | ±1°C |
| Vibration Isolation | Passive anti-vibration feet |
