1、AMSC N/A FSC 5950 MIL-PRF-27/68C 28 April 2008 SUPERSEDING MIL-PRF-27/68B 2 June 2003 PERFORMANCE SPECIFICATION SHEET TRANSFORMERS, AUDIO FREQUENCY This specification is approved for use by all Depart- ments and Agencies of the Department of Defense. The requirements for acquiring the products descr
2、ibed herein shall consist of this specification and MIL-PRF-27. FIGURE 1. Dimensions and configuration. INCH-POUND Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/68C 2 Inches mm Inches mm .005 .020 .030 .052 .062 .112 .125 .187 0.13 0.51
3、0.76 1.32 1.57 2.84 3.18 4.75 .200 .500 .600 .800 .900 1.000 1.085 5.08 12.70 15.24 20.32 22.86 25.40 27.56 NOTES: 1. Dimensions are in inches. 2. Metric equivalents are given for general information only. 3. Unless otherwise specified, tolerance is .010 (0.25 mm). 4. Marking shall be on sides and/o
4、r top of case. 5. Electrical values shall be marked as specified in table I, as applicable. FIGURE 1. Dimensions and configuration Continued. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/68C 3 REQUIREMENTS: (When numbers in parentheses,
5、 i.e., (1.-3) are used, they indicate the winding and the extreme terminals of the winding.) Electrical ratings: See table I. Power level: 500 milliwatts maximum at 100 hertz. Working voltage: 175 volts (except 355 volts on M27/68-07). Frequency range: 100 hertz to 8 kilohertz (except 100 hertz to 8
6、 kilohertz on M27/68-01). TABLE I. Electrical ratings. 1/ Dash number Circuit diagram (see figure 1) Primary impedance ohms (1-3) Secondary impedance ohms (5-7) Primary DCR ohms 25% Secondary DCR ohm 25% Primary unbalanced DC current max (mA) 01 02 03 04 05 06 07 08 09 10 11 12 A A B B A B A A B B B
7、 A 10k CT 10k CT 10k CT 1,500 CT 1,000 CT 1,000 CT 600 CT 600 CT 600 CT 600 CT 600 CT 250 CT 10k CT 600 CT 4 15 600 CT 4 25k CT 600 CT 60 15 4 600 CT 700 700 700 105 70 70 42 42 42 42 42 17 1,000 60 0.4 1.5 60 0.4 6 2,600 6 1.5 0.4 60 1.0 1.0 1.0 2.5 3.0 3.0 4.0 4.0 4.0 4.0 4.0 7.0 1/ Qualification
8、testing and approval to M27/68-01 and all tests in accordance with table VII of MIL-PRF-27 for M27/68-07 shall be sufficient to grant qualification approval to M27/68-01 through M27/68-12, inclusive. Qualification by similarity can be obtained for MIL-PRF-26/67, /69, /70, /71, and /72 by the submiss
9、ion of two samples each, (of dash number 01 for MIL-PRF-27/67, /69, /70, /71, and /72) which shall be subjected to group A, subgroup II tests, with zero defects allowed. Design and construction: Dimensions and configuration: See figure 1. Duty cycle: Continuous. Case: Encapsulated. Material: Plastic
10、. Terminals: Pin (printed circuit). Material: Nickel iron alloy, tin plated. Diameter: .030 .005 inch. Length: .500 .030 inch. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/68C 4 Weight: 56.70 grams maximum. Altitude: 70,000 feet, maximu
11、m. Operating temperature range: -55C to +130C. Terminal strength: MIL-STD-202, method 211, test condition A, 2 pounds. Dielectric withstanding voltage: At sea level: 500 volts rms (except 1,000 volts rms on M27/68-07). At barometric pressure: 300 volts rms (except 444 volts rms on M27/68-07). Electr
12、ical characteristics: See table II. Frequency response. Reference frequency: 1 kilohertz. Polarity: Additive, with terminals 3 and 5 connected. TABLE II. Electrical characteristics. Frequency response at 100 Hz to 10 kHz 1 dB Dash number Zs(1-3) ohms ZL (5-7) ohms EL volts Primary dc current (1-3) m
13、A 01 1/ 02 03 04 05 06 07 08 09 10 11 12 10 k 10 k 10 k 1,500 1,000 1,000 600 600 600 600 600 250 10 k 600 4 15 600 4 25 k 600 60 15 4 600 12.0 12.0 12.0 5.0 4.0 4.0 3.0 3.0 3.0 3.0 3.0 2.0 0.5 0.5 0.5 1.25 1.5 1.5 2.0 2.0 2.0 2.0 2.0 3.5 1/ Frequency response is 100 hertz to 8 kilohertz 1 dB. Marki
14、ng location: See figure 1. Part or Identifying Number (PIN): M27/68- (dash number from table I). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-27/68C 5 Changes from previous issue. The margins of this specification are marked with vertical
15、lines to indicate where changes from the previous issue were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to evaluate the requirements of this document based on the entire c
16、ontent irrespective of the marginal notations and relationship to the last previous issue. Referenced documents. In addition to MIL-PRF-27, this document references the following: MIL-STD-202 MIL-PRF-27/67 MIL-PRF-27/69 MIL-PRF-27/70 MIL-PRF-27/71 MIL-PRF-27/72 Custodians: Preparing activity: Army C
17、R DLA CC Navy EC Air Force 11 (Project 5950-2008-010) DLA - CC Review activities: Army AR, CR4, MI Navy AS, MC, OS, SH Air Force 19, 99 NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of this information above using the ASSIST Online database at http:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
