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ASTM A804/A804M-99
Standard Test Methods for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Sheet-Type Test Specimens
Automaticky přeložený název:
Standardní zkušební metody pro Střídavý magnetických vlastností materiálů při zapnutí frekvencích využívajících plechu Typ zkušebních vzorků
NORMA vydána dne 10.5.1999
Informace o normě:
Označení normy: ASTM A804/A804M-99
Poznámka: NEPLATNÁ
Datum vydání normy: 10.5.1999
Kód zboží: NS-4315
Počet stran: 15
Přibližná hmotnost: 45 g (0.10 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Anotace textu normy ASTM A804/A804M-99 :
Keywords:
Wattmeter-ammeter-voltmeter method-magnetic properties, a-c magnetic properties-single-layer sheet materials at power, frequencies 50/60 Hz, test, ICS Number Code 77.140.40 (Steels with special magnetic properties)
Doplňující informace
| 1. Scope | ||||||||||||
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1.1 These test methods cover the determination of specific core loss and peak permeability of single layers of sheet-type specimens tested with normal excitation at a frequency of 50 or 60 Hz. Note 1-These test methods have been applied only at the commercial power frequencies, 50 and 60 Hz, but with proper instrumentation and application of the principles of testing and calibration embodied in the test methods, they are believed to be adaptable to testing at frequencies ranging from 25 to 400 Hz.1.2 These test methods employ calibration procedures that provide correlation with the 25-cm [250-mm] Epstein test. 1.3 The range of test inductions is governed by the properties of the test specimen and by the available instruments and other equipment components. Normally, nonoriented electrical steels can be tested over a range from 8 to 16 kG [0.8 to 1.6 T] for core loss. For oriented electrical steels, the normal range extends to 18 kG [1.8 T]. Maximum inductions in peak permeability testing are limited principally by heating of the magnetizing winding and tests are limited normally to a maximum a-c magnetizing force of about 150 Oe [12 000 A/m]. 1.4 These test methods cover two alternative procedures as follows: Test Method 1-Sections 6 to 12 Test Method 2-Sections 13 to 19 |
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| 2. Referenced Documents | ||||||||||||
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