ASTM A889/A889M
Standard Test Method for Alternating-Current Magnetic Properties of Materials at Low Magnetic Flux Density Using the Voltmeter-Ammeter-Wattmeter-Varmeter Method and 25-cm Epstein Frame
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About This Item
ASTM A889/A889M is the ASTM standard for measuring alternating-current magnetic properties of materials at low magnetic flux density using the voltmeter-ammeter-wattmeter-varmeter method and a 25-cm Epstein frame. It is designed to support consistent evaluation of magnetic behavior under controlled test conditions, helping users compare materials with greater confidence. For manufacturers, labs, and purchasers of magnetic materials, this standard provides a defined technical basis for performance measurement and quality verification.
Purpose of ASTM A889/A889M
The purpose of ASTM A889/A889M is to establish a recognized test method for determining AC magnetic properties at low magnetic flux density. By specifying the voltmeter-ammeter-wattmeter-varmeter method with a 25-cm Epstein frame, the standard helps create repeatable measurements that can be used for technical comparison and reporting. It is particularly relevant where accurate low-flux magnetic characterization matters and where a common test approach is needed for consistent results across different materials or test programs.
Common use cases of ASTM A889/A889M
This standard is commonly used when evaluating magnetic materials in laboratory or quality-control settings, especially during product development, incoming inspection, or specification compliance checks. ASTM A889/A889M may be applied when low magnetic flux density behavior must be measured with a controlled Epstein frame setup and electrical test instrumentation. It is useful for teams that need a standardized way to assess alternating-current magnetic properties for comparison, documentation, or procurement decisions.
Why ASTM A889/A889M matters
ASTM A889/A889M matters because it supports more consistent and defensible magnetic testing. A defined method reduces variation between laboratories, improves comparability of results, and helps organizations make better decisions about material selection and acceptance. In procurement and quality control, using a recognized ASTM standard can also reduce misunderstandings between buyers and suppliers. For technical documentation, it provides a clear reference point for how alternating-current magnetic properties were measured.
- AC magnetic properties at low flux density
- Voltmeter-ammeter-wattmeter-varmeter method
- 25-cm Epstein frame test setup
- Material comparison and reporting
- Quality control and compliance testing
- Publication Date: 2020-07-23
- Publisher: ASTM
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