MS21367G
NOTES:
1. Polarization during moisture resistance test is not applicable.
2. The percent coupling between two radio frequency coils is to be determined by measuring the voltage induced in a coil when a voltage is applied to an adjacent coil. Percent coupling is not to be measured for parts with nominal inductances of less than 1.0 µH. The measurement is to be performed at 10 kHz for nominal inductance values from 1.0 µH through 100 µH and at 1 kHz for nominal inductance values greater than 100 µH. The measurement circuit is shown in the figure below.
Equipment for 1 kHz and 10 kHz consists of General Radio Audio Oscillator and Power Amplifier type 1308-A, or equivalent and Model 400 vacuum tube voltmeter, or equivalent.
The coils to be tested shall be taped or otherwise secured such that the bodies of the coils are kept parallel and in contact with each other to insure maximum coupling as shown in the figure below.
The voltage levels shall be as low as possible to permit reliable readings of V2. The inductance shall be measured with .02 volt injection voltage on a Hewlett-Packard model 260A Q-meter or equivalent.
The percent coupling is to be calculated using the equation:
Percent coupling =
LI X
L2
V 2
VI
X 100
where: L1 = effective inductance of primary coil (measured at standard Q-meter test frequency)
L2 = effective inductance of secondary coil (measured at standard Q-meter test frequency)
V1 = voltage measured across primary
V2 = voltage measured across secondary
3. For dielectric withstanding voltage, barometric pressure and insulation resistance units shall be placed on flat metal plate with leads insulated from surface. Measurement of dielectric withstanding voltage, barometric pressure and insulation resistance shall be between the leads of the coil connected together and the metal plate.
4. The marking shall be as specified in MIL-PRF-15305 except that the marking shall be on the unit package or container.
FIGURE 1. Typical coil test fixture.
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