MIL-DTL-16034B
6.6.1 Accuracy. The accuracy is a number, which defines the limit of error, expressed as a percentage of full-
scale value unless otherwise specified herein.
6.6.1.1 Accuracy rated. The rated accuracy is a number assigned by the manufacturer to designate the accuracy
classification of the meter. This number, usually expressed as a percentage of full-scale value, is the limit which errors
will not exceed when the meter is used under reference conditions.
6.6.2 Current circuit. The current circuit is that combination of conductors and windings of the meter which
carries the current of the circuit in which a given electrical quantity is to be measured, or a definite fraction of that
current, or a current dependent upon it.
6.6.3 Damping. Damping is the term applied to meter performances to denote the manner in which the pointer
settles to its steady indication after a change in value of the measured quantity. The following general classes of
damped motion are distinguished:
a.
Periodic, in which the pointer oscillates about the final position before coming to rest.
b.
Aperiodic, in which the pointer comes to rest without overshooting the rest position.
The point of change between periodic and a periodic damping is called critical damping.
Note: A meter is considered to be critically damped when overshoot is present but does not exceed an amount
equal to one-half the initial-accuracy requirement of the meter (see 6.6.18).
6.6.4 Damping factor. The damping factor is the ratio of the steady deflection to the difference between
maximum momentary deflection and steady deflection produced by a sudden application of constant electric power.
All deflections are measure in angular degrees. In this specification, end-scale deflection is used as maximum
momentary deflection.
Note: The damping factor of spring-controlled meters with their normal accessories, if any, is measured as the
ratio of the steady deflection in angular units to the differences between angular maximum momentary deflection and
the steady deflection produced by a sudden application of sufficient constant electric power to an unenergized meter to
obtain end-scale deflection. This is the special case in which the deviation of the pointer from the position of
equilibrium is the maximum value obtainable.
6.6.5 End scale value. The end-scale value of a meter is the value of the actuating electrical quantity which
corresponds to end-scale indication. When zero is not at one end or at the electrical center of the scale, the larger value
is taken.
6.6.6 Error and correction.
6.6.6.1 Error. The error of indication is the difference between the indication and the true value of the quantity
measured. It is the quantity which, when algebraically subtracted from the indication, gives the true value. A positive
error denotes that the indication of the meter is greater than the true value.
6.6.6.2 Correction. The correction has the same numerical value as the error of indication, but the opposite sign.
It is the quantity which, when algebraically added to the indication, gives the true value. If the symbols T, I, E, and C
represent the true value, the indication, the error, and the correction, respectively, the following equations hold:
E = I-T
C = T-I
EXAMPLE: A voltmeter indicates 112 volts when the voltage applied to its terminal is actually 110 volts.
THEN:
Error = 112-110 = +2 volts
Correction = 110-112 = -2 volts
6.6.7 External-field influence. The external-field influence is defined as the percentage change in the indication
which is caused solely by an external field of an intensity of 5 oersteds, produced by a current of the same kind and
frequency as that on which the meter operates, with the most unfavorable phase and position of the external field.
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