electromagnetic interference. Filters furnished to the requirements of this specification contain shunting ceramic discoidal capacitors and series inductors \(FSC 5915\). Capacitors furnished to the requirements of this specification contain shunting ceramic discoidal capacitors \(FSC 5910\). For the purposes of this specification, feed-through capacitor types \(C circuit configuration\) are referred to herein as a filter. Passband power may be alternating current \(ac\) or direct current \(dc\) and the filters used primarily in the reduction of broadband radio frequency interference. This specification provides for two levels of product assurance requirements. Filters covered by this specification are capable of operation over the temperature range of -55 degrees C to +125 degrees C.

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MIL-PRF-28861D

d. Final measurements: Following the 24-hour conditioning period, dielectric withstanding voltage with 90

percent of the voltage specified in 4.6.3 applied for 5 � 1 seconds, insulation resistance (at +25�C), and

insertion loss shall be measured as specified in 4.6.13 and 4.6.5, respectively.

e. Visual inspection: After the test, filters shall be visually inspected for corrosion and obliteration of marking.

4.6.25 Solderability (see 3.30).

4.6.25.1 Solderability of terminals. Filters shall be tested in accordance with method 208 of MIL-STD-202. The

following details and exceptions shall apply:

a. Number of terminations to be tested: 2.

b. Special preparations of terminations: None.

4.6.25.2 Solderability of mounting termination (when applicable). Filters shall be tested as follows: (Note: The

terminal solderability test (see 4.6.25.1) should be done with the filters already soldered to the test coupon; however,

if the size of the solder pot or variations in the terminal preclude this sequence, the terminal solderability may be done

first).

a. Filters shall be soldered to the test coupon shown on figure 9. The filters shall be soldered with an iron at

+253�C � 7�C using PB36AWB6 or PB36AWB7 solder in accordance with J-STD-006. The test coupon

shall be preheated to +100�C � 7�C. Heat should be applied to the coupon first in the immediate vicinity of

the filter. The tip of the iron should then be moved so that it comes in contact with the edge of the filter for

no more than 5 seconds or until a smooth solder fillet has been established around the filter. This

sequence will be repeated with each filter.

b. Test coupon: Shall be in accordance with figure 9 and as follows:

(1) Material: Brass in accordance with ASTM-B16/B16M, copper alloy UNS No. C36000, 1/2 hard or, brass

in accordance with ASTM-B36/B36M, copper alloy UNS No. C26000, � hard; 0.014 � 0.002 inch (0.36

� 0.05 mm) thick.

(2) Finish: Copper plate in accordance with SAE-AMS2418-1 and tin plate in accordance with ASTM B

545, class B.

(3) Dimensions: In accordance with figure 9 and as follows:

"a" =

recommended mounting hole diameter as specified (see 3.1).

"b" =

2 times the maximum filter body diameter.

"c" =

"b" or 0.50 inch (12.70 mm), whichever is greater.

c. Measurements after test: Insulation resistance (+25�C) and capacitance shall be measured as specified in

4.6.13.1 and 4.6.4 while the filters are on the test coupon.