MIL-DTL-16034B
3.7.2 Calibration Potentiometer Multiple Meter Sensing. In applications where one meter is used in conjunction
with a selector switch to indicate several different readings, the meter's own calibration pot will be adjusted to 0 ohms.
The equipment containing the meter shall provide a separate panel or circuit board containing individual meter trim
pots to calibrate the meter for each position of the meter selector switch. The external trim pots shall be adjusted from
0 to 5 ohms, 10 turns and be easily accessible in the equipment. A separate trim pot shall be provided to calibrate the
meter for each circuit to be indicated on the meter.
3.8 Calibration.
3.8.1 Position. Meters shall be calibrated in the position in which they are normally used, and shall meet the
specified accuracy requirements in such position at the reference temperature (25 °C). The meter shall meet its
specified accuracy requirements with the trim pot adjusted to the full 5 ohms of resistance at a reference temperature
of 25 °C.
3.8.2 Mounting panel. Switchboard meters shall meet the specified accuracy requirements when mounted on a
nonmagnetic panel and also on a magnetic-steel panel ⅛ inch thick.
3.8.3 Frequency. Alternating-current meters shall be calibrated at the following frequencies:
Kind of current
Frequency (c.p.s.)
AC
60
AD
60 and DC
RF
60
RL
60
AF
400
AE
800
AM
25, 60, 200, 400, 800, 1000
AT
(see 3.1)
3.9 Position influence (balance). When spring-controlled switchboard meters are tilted 60 degrees from their
normal mounting position, in any direction, the pointer tip shall not deviate from the zero mark more than the amount
3.10 Initial accuracy. At the reference temperature, the initial accuracy, expressed as a percentage of the full-
3.10.1 Direct-current reversal error. The change in indication, when reversed DC readings are taken on portable
meters of 0.25 percent accuracy class designed for both AC and DC measurements (AD meters), shall not exceed the
3.10.2 Wave-form effect. The change in indication caused by an abnormal wave described in 4.5.4.1.2 shall not
cause a change in indication greater than the amount specified (see 3.1). This test applies only to portable meters of
0.25 percent accuracy class designed for AC measurement.
3.11 Damping factor. When tested in accordance with 4.5.5, the damping factor shall not be less than the value
specified (see 3.1).
3.12 Response time. When tested in accordance with 4.5.6, the response time shall not exceed the value specified
(see 3.1).
3.13 Power consumption. The power consumption shall not exceed the value specified (see 3.1 and 4.5.7).
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