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ASTM-A912:2011 Edition

ASTM-A912:2011 Edition

$40.63

A912/A912M-11 Standard Test Method for Alternating-Current Magnetic Properties of Amorphous Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method with Toroidal Specimens

Published By Publication Date Number of Pages
ASTM 2011 10
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1.1 This test method covers tests for various magnetic properties of amorphous materials at power frequencies [25 to 400 Hz] using a toroidal test transformer. The term toroidal test transformer is used to describe the test device, reserving the term specimen to refer to the material used in the test. The test specimen consists of toroidally wound flat strip.

1.2 This test method covers the determination of core loss, exciting power, rms and peak exciting current, several types of ac permeability, and related properties under ac magnetization at moderate and high inductions at power frequencies [25 to 70 Hz].

1.3 With proper instrumentation and specimen preparation, this test method is acceptable for measurements at frequencies from 5 Hz to 100 kHz. Proper instrumentation implies that all test instruments have the required frequency bandwidth. Also see Annex A2.

1.4 This test method also provides procedures for calculating impedance permeability from measured values of rms exciting current and for calculating ac peak permeability from measured peak values of total exciting current at magnetic field strengths up to about 10 Oe [796 A/m].

1.5 Explanations of symbols and brief definitions appear in the text of this test method. The official symbols and definitions are listed in Terminology A340 .

1.6 This test method shall be used in conjunction with Practice A34/A34M .

1.7 The values and equations stated in customary (cgs-emu and inch-pound) units or SI units are to be regarded separately as standard. Within this standard, SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard.

1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Significance and Use
Interferences
2 Apparatus
FIG. 1
3 Basic Circuit
4 Sampling and Test Specimens
Procedure
Calculation (Customary Units)
FIG. 2
6 Calculation (SI Units)
7 Precision and Bias
Keywords
A1. RECOMMENDED STANDARD TEST VALUES
A1.1 Standard Test Values
8 A2. PREPARATION OF STANDARD TOROIDAL TEST SPECIMENS
A2.1
A2.2
A2.3
A2.4
A2.5
A2.6
A3. CORE FORMS AND PROTECTIVE ENCLOSURES
A3.1
A3.2
A4. SUGGESTED MINIMUM TOROIDAL TEST SPECIMEN
A4.1 Dimensional Requirements
A5. ANNEALING PROCEDURE FOR TYPICAL AMORPHOUS METAL
A5.1
9 X1. BASIC PRINCIPLES
X1.1 Basic Principles
X2. TEST INSTRUMENTS FOR EXTENDED FREQUENCY RANGE
X2.1
X2.2
X2.3

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