MIL-STD-750F
4.1.2 Electrical test frequency. Unless otherwise specified, the electrical test frequency shall be 1,000 ±25 Hertz
(Hz).
4.1.3 Accuracy. The specified limits are for absolute (true) values, obtained with the specified (nominal) test conditions. Proper allowance shall be made for measurement errors (including those due to deviations from nominal test conditions) in establishing the working limits to be used for the measured values, so that the true values of the device parameters (as they would be under nominal test conditions) are within the specified limits.
The following electrical test tolerances and precautions, unless otherwise specified in the applicable acquisition document, shall be maintained for all device measurements to which they apply (test methods series 3000, 4000 and other specified electrical measurements). Wherever test conditions are specified in the applicable acquisition document to a precision tighter than the tolerances indicated below, the specified conditions shall apply and take precedence over these general requirements.
a. Bias conditions shall be held to a tolerance of ±3 percent of the specified value, except for breakdown testing (see 4.1.3.c).
b. Such properties as input pulse characteristics, repetition rates, and frequencies shall be held to a tolerance of ±10 percent. Nominal values shall be chosen so that ±10 percent variation (or the actual test equipment variation, if less than 10 percent) does not affect the accuracy or validity of the measurement of the specified value.
c. Voltages and currents applied in breakdown testing shall be held to a tolerance of ±1 percent of the specified value(s).
d. Resistive loads shall be ±5 percent tolerance.
e. Capacitive loads shall be ±10 percent or ±1 picofarad (pF) tolerance, whichever is greater.
f. Inductive loads shall be ±10 percent or ±5 microhenries (µH) tolerance, whichever is greater. g. Static parameters shall be measured to a tolerance of ±1 percent.
h. Switching parameters shall be measured to a tolerance of ±5 percent or ±1 nanosecond (ns), whichever is greater.
4.1.3.1 Control based on uncertainty. Test processes that have complex characteristics are best performed and controlled by the application of uncertainty analysis. The overall uncertainty in a test, or measurement process, shall be determined and impact of said uncertainty on the product parameter tolerance shall be taken into account. The methods used for determining uncertainty shall be defined and documented. The method selected shall use any, or all, combination of the following forms:
a. Arithmetic addition (linear): Normally produces an overly conservative estimate and reflects a highly improbable situation in which contributing errors are at their maximum limit at the same time and same direction.
b. Root sum square (RSS): Normally applied where errors tend to fit a normal distribution (Gaussian) and are from independent sources.
c. Partial derivatives: Used where complex relationships exist.
d. Monte Carlo simulation: Used in very complex situation where other methods are not easily applied or do not fit.
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