MIL-PRF-27/290C
No load (center tap unbalanced): ±1 percent at 1 volt, 5 kHz across the primary.
Harmonic distortion: Total harmonic content of the output shall be a maximum of 5 percent at
100 mW and 3.5 mA in the primary.
Secondary output balance: When the transformers are operated with identical loads of 15 kΩ to
1 MΩ on each of the secondary windings and the primary input voltage is equal to
15 sin {2š(400 ±20) T}, where T = time in seconds, the output voltages shall be equal within ±.05%
(see figure 2).
Insertion loss: At 100 mW in the primary, the insertion loss shall be a maximum of 3.0 dB at 1 kHz.
Frequency response: ZS = 1,000 ohms; ZL = 16 kΩ, EL = 1 volt; reference frequency = 1 kHz.
Frequency range is 300 Hz to 20 kHz, ±3.0 dB.
Self-resonant frequency: Shall be a minimum of 300 kHz.
Vibration (high frequency): MIL-STD-202, method 204, test condition B.
Marking location: See figure 1.
Part or Identification Number (PIN): M27/290-01.
Changes from previous issue. The margins of this specification are marked with vertical 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 content
irrespective of the marginal notations and relationship to the last previous issue.
Referenced documents.
MIL-PRF-27
MIL-STD-202
ASTM B339
ASTM B545
Custodians:
Preparing activity:
Army - CR
DLA - CC
Navy - EC
Air Force - 85
(Project 5950-2008-036)
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 the information
above using the ASSIST Online database at https://assist.daps.dla.mil.
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