MIL-DTL-22442G
maintain the measurement nor calibration accuracy that is true at higher range scales. The
instrument specification sheet itself is often unclear as to the actual accuracy when measuring a
microvolts signal. The attenuation circuit as shown on figure 8 of MIL-DTL-22442/1 can
resolve this problem without the use of an expensive ac true rms microvoltmeter provided the
following conditions are met:
a. The attenuation value is calibrated with NBS traceability at measurable voltage levels.
b. The impedances do match between the function generator and the amplifier under test.
c. The attenuation value is 80 dB and not 60 dB.
Note: experimental evidence shows that a 60 dB attenuator does not provide a constant voltage
independent of frequency or anticipated load impedances.
An ac ratio transformer standard (see 6.4.1.9), whose ratio is calibrated at a higher voltage level,
can serve as an adequate transfer standard for verifying an instrument with ac true rms
microvoltage measuring capability and for calibrating the attenuator described in figure 8.
6.5 Definitions.
a. Bend relief. Any method used to alleviate stress on a section of cable due to bending of
the cable. Example: Adding rubber at the cable/connector interface to reduce cable stress
caused by movement of the connector.
b. Bonded bend relief. A bend relief that is molded to the connector.
c. Bonded strain relief. A strain relief that is molded to the cable assembly.
d. "Y" junction/crotch. The point at which one cable separates into two or more branches.
e. Heat shrunken transition. Placing a piece of heat shrinkable tubing around a portion of
cable and shrinking in place, creating a heat shrunken transition. This is usually placed around
an interface where the connector meets the cable.
f. Molded junction. Encapsulating in polyurethane or rubber a junction of one or more
cables, or wires, creates a molded junction.
g. Molded section. A molded section is created by encapsulating a portion of the cable
jacket in polyurethane or rubber. This differs from the molded junction in that it is not limited to
cable junctions.
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