ASTM E387

ASTM E387 is the standard test method for estimating stray radiant power ratio in dispersive spectrophotometers using the opaque filter method. It helps users evaluate how much unwanted radiant energy may be reaching the detector outside the intended wavelength band, which can affect measurement accuracy. For laboratories, instrument manufacturers, and quality control teams, this ASTM standard supports more reliable spectrophotometer performance checks and clearer comparison of instrument behavior across testing conditions.

Purpose of ASTM E387

The purpose of ASTM E387 is to provide a consistent method for estimating stray radiant power ratio in dispersive spectrophotometers. By using an opaque filter approach, the standard gives a practical way to assess whether out-of-band radiant energy is influencing results. This technical document is commonly used when evaluating instrument quality, comparing performance, or supporting compliance-focused testing workflows. ASTM E387 helps make spectrophotometer assessments more repeatable and easier to interpret.

Common use cases of ASTM E387

ASTM E387 is commonly used during spectrophotometer qualification, routine performance verification, and instrument troubleshooting. It is relevant in laboratories and technical environments that rely on dispersive spectrophotometers for optical measurements where stray radiant power can affect data quality. The standard is also useful in procurement and acceptance testing when buyers want a defined method for checking instrument characteristics before deployment. In these settings, ASTM E387 supports a more controlled and comparable evaluation process.

Why ASTM E387 matters

This standard matters because stray radiant power can distort measurement results and reduce confidence in spectrophotometer data. ASTM E387 provides a recognized framework for estimating that effect, which can improve consistency in testing and quality control. Using a clear ASTM standard also supports better communication between suppliers, laboratories, and customers when instrument performance is being reviewed. For organizations that depend on dependable optical measurements, ASTM E387 can help reduce risk and improve decision-making.

• Opaque filter method for stray radiant power estimation
• Focused on dispersive spectrophotometers
• Supports performance checking and comparison
• Useful for quality control and acceptance testing
• Helps assess measurement reliability