ECA-174-1956-R1982.pdf
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1、/- I - Audio Transformers for Electronic Equipment o ;i( F 8 H m 4 c RS-174 (Revision of TR-121) e e December 1956; Engineering Department RADIO- ELECTRONICS - TELEVISION MANUFACTURERS ASSQCIATION Copyright Electronic Components, Assemblies or (b) Shall, where (a) is impracticable, be induced in the
2、 winding under test ; while in either case, other windings and core are grounded. (a) On first measurement be less than the following limiting values 8.1.4 The magnitude of the corona level across insulation subject to damage by corona shall RMS Worlcing Voltage (Kilovolts) Corona Level (Microvolts)
3、 e Up to 8.6 1,000 8.61 to 15 2,600 (b) On second or repeated measurement, shall be less than twice the above stated limiting values. Appendix I The following table shall be standard for specifying impedance values to be used for transformer terminations : 4 ohms 8 ohms 16 ohms 38 ohms 150 ohms 600
4、ohms 2,400 ohms 9,600 ohms 40,000 ohms 100,000 ohms Appendix II LOAD TEST 1 . The load for each seconclary winding shall be an impedance having the value specified in 3 . 1 . 1 . 2. The transformer shall be loaded at the maximum output epecified in 3 . 1 . 6 , with dc current speci- fied in 3 . 1 .
5、3 , and duty cycle specified in 8.3.3. a Copyright Electronic Components, Assemblies and this constant temperature shall be the reference temperature (t) . The observed resistance (R) shall be measured as soon as practicable and within 15 seconds after the comple- tion of the test run on transformer
6、s weighing less than 10 pounds. The resistances of the wind- ings having the higher temperature shall be measured first. 4 10. The temperature rise of the transformer shall be computed by subtracting the temperature of the ambient air around the transformer at the end of the test from the temperatur
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