MIL-DTL-83729C
3.5.7 Soldering. Solder and soldering flux shall be of such quality as to enable the choppers to meet all
requirements of this specification. When a soldering operation is used for sealing, the use of flux shall be held to a
minimum. All flux and loose or spattered solder shall be removed. Solder shall not be used primarily for obtaining
mechanical strength. Electrical connections shall be mechanically secure and electrically continuous before and after
soldering. MIL-HDBK-454, guideline 5 is a useful reference.
3.6 Seal.
3.6.1 Seal test I (applicable to sealed enclosures only (see 4.6.2.1). There shall be no continuous visible stream
of bubbles.
3.6.2 Seal test II (applicable to hermetically sealed enclosures only (see 4.6.2.2). The leakage rate shall not
exceed 1 x 10-8 atmospheric cubic centimeters per second of air (atm cc/s).
3.7 Electrical characteristics (see 4.6.3).
3.7.1 Contact resistance (see 4.6.3.1). Unless otherwise specified (see 3.1 and 6.2.2), the contact resistance
shall not exceed 0.10 ohm.
3.7.2 Direct current (dc) coil resistance (see 4.6.3.2). The dc coil resistance shall be so specified (see 3.1 and
6.2.2).
3.7.4 Capacitance (when specified) (see 3.1, 6.2.2, and 4.6.3.4). The capacitance shall be as specified.
3.7.5 Polarity (see 6.5, and 4.6.3.5). The polarity of the contacts shall be as specified (see 3.1 and 6.2.2).
3.7.6 Starting voltage (see 4.6.3.6). The choppers shall start immediately, but need not operate within the
specified limits.
3.7.7 Waveform characteristics (see 4.6.3.7). The waveform characteristics shall be as specified in 3.7.7.1 to
3.7.7.5, inclusive. The chopper shall operate over the specified frequency and voltage range (see 3.1 and 6.2.2).
The chopper output shall be a square wave with fundamental frequency equal to the frequency of the voltage applied
to the coil.
3.7.7.1 Dwell time (see 4.6.3.7.1.1 and 6.5) (on time). The dwell time for choppers shall be as specified (see 3.1
and 6.2.2).
3.7.7.2 Dissymmetry (see 4.6.3.7.1.2 and 6.5). Unless otherwise specified (see 3.1 and 6.2.2), the differential
between the dwell time of the positive half cycle and the dwell time of the negative half cycle shall not exceed 15
percent for single-pole, double-throw (SPDT) choppers with no special features. Dissymmetry for all other types of
3.7.7.3 Contact bounce (see 4.6.3.7.2 and 6.5). Unless otherwise specified (see 3.1 and 6.2.2), contact bounce
shall not exceed 4 degrees during the initial and/or final 10 degrees of dwell, or a maximum of 8 degrees for any
dwell period.
3.7.7.4 Transfer time (see 4.6.3.7.3 and 6.5) (when specified) (see 3.1 and 6.2.2). The transfer time shall be as
specified.
3.7.7.5 Phase angle (see 4.6.3.7.4 and 6.5). The phase angle shall be as specified (see 3.1 and 6.2.2).
3.7.8 Noise level. Unless otherwise specified (see 3.1 and 6.2.2), the noise level shall not exceed 1 mV peak to
peak or 300 µV rms when choppers are tested as specified in 4.6.3.8.
3.8 Dielectric withstanding voltage (DWV) (see 4.6.4). There shall be no evidence of damage, arcing, breakdown,
or leakage in excess of 100 µA.
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