MIL-DTL-16034B
3.14 Frequency range. Alternating-current meters having a nominal frequency of 60 cycles per second shall
operate over the range specified, and the change in indication from the reading at the nominal frequency shall not
3.15 Frequency influence. The frequency influence shall be not greater than the value specified (see 3.1 and
3.16 External-field influence. Switchboard meters and 0.25 percent accuracy class portable meters shall have
sufficient magnetic shielding so that the effect of an external magnetic field of 5 oersteds will not cause a change in
3.17 Heat effect at 65 °C. Meters shall indicate freely (see 6.6.9) during and after the test specified in 4.5.11.
The heat effect at 65 °C (the difference between corresponding readings of steps 9 and 11 of table VI), and the
permanent change in indication (the difference between corresponding readings of steps 1 and 13 of table VI), shall
not exceed the value specified (see 3.1).
3.18 Temperature influence. The temperature influence shall not exceed the value specified (see 3.1 and 4.5.12).
3.19 Low-temperature exposure. During exposure to a temperature of 0 °C, meters shall indicate freely (see
6.6.9). The change in indication at the low temperature, and the permanent change in indication, shall not exceed the
3.20 Overload.
3.20.1 Momentary overload. The mechanism of AC and DC meters having current circuits shall be sufficiently
rugged to withstand, without mechanical or thermal injury, a series of momentary overloads as specified in 4.5.14.1.
As a result of this test, it shall not be necessary to make any repairs or adjustments other than resetting the pointer to
zero, through the external zero-adjuster, and the permanent change in indication shall not exceed the value specified
(see 3.1).
3.20.2 Sustained overload. When tested as specified in 4.5.14.2, the permanent change in indication, and the
temporary and permanent zero shifts shall not exceed the value specified (see 3.1).
3.21 Dielectric stress. When tested in accordance with 4.5.15, meters shall withstand a voltage of 2,600 volts
alternating current without damage or flashover.
3.22 Insulation resistance. The insulation resistance shall not be less than 20 megohms (see 4.5.16).
3.23 Vibration. When meters are tested in accordance with 4.5.17, no screws, bearings, pivots, or other parts
shall be so loosened or damaged as to cause a change in indication greater than the value specified (see 3.1).
3.23.1 Friction effect. After completion of the vibration test specified in 4.5.17.1, the friction effect shall not
3.24 Humidity resistance. After completion of the humidity resistance test specified in 4.5.18, meters shall
operate freely, and the permanent change in indication shall not exceed the value specified (see 3.1).
3.25 Shock (high-impact). When high-impact, shock-resistant meters are tested in accordance with 4.5.19, no
screws, bearings, pivots, windows or other parts shall become loosened, cracked (except as specified hereinafter) or
unduly damaged. Minor cracking or distortion of pivots will be permissible only when conformance to the post-shock
performance has been demonstrated. Cracking of glass windows will be permissible only when readability of the
complete scale is retained and no fragment has become dislodged. The permanent change in the indication based on
calibration made after resetting the pointer to zero shall not exceed the value specified (see 3.1).
Note: The design of high-impact, shock-resistant meters shall be such that disassembly and proper reassembly
prior to the shock test will not impair the shock-resistance of the meter.
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