MIL- STD-883F 2004 TEST METHOD STANDARD MICROCIRCUITS - 第14页

MIL-STD-883F 8 3.1.13 Pr ecis ion . The degree t o which an i nstr ument, devic e, ass emblage, t est, measurement or proc ess exhibits repeatab ility. Exp ressed sta tistically or th r ough vari ous tec hniques of Stati…

MIL-STD-883F

3.1.5 Worst case condition

. Worst case condition(s) consists of the simultaneous application of the most adverse (in

terms of required function of the device) values (within the stated operating ranges) of bias(es), signal input(s), loading and

environment to the device under test. Worst cases for different parameters may be different. If all the applied test

conditions are not established at the most adverse values, the term "partial worst case condition" shall be used to

differentiate and shall be accompanied by identification of the departure from worst case. For example, the lowest values of

supply voltages, signal input levels, and ambient temperature and the highest value of loading may constitute "worst case

conditions" for measurement of the output voltage of a gate. Use of the most adverse values of applied electrical conditions,

at room temperature, would then constitute "partial worst case conditions" and shall be so identified using a postscript "at

room temperature."

3.1.5.1 Accelerated test condition

. Accelerated test conditions are defined as test conditions using one or more applied

stress levels which exceed the maximum rated operating or storage stress levels but are less than or equal to the "Testing

Rating" values.

3.1.6 Static parameters

. Static parameters are defined as dc voltages, dc currents, or ratios of dc voltages or dc

currents, or both.

3.1.7 Dynamic parameters

. Dynamic parameters are defined as those which are rms or time-varying values of voltages

or currents, or ratios of rms or time-varying values of voltages or currents, or both.

3.1.8 Switching parameters

. Switching parameters are defined as those which are associated with the transition of the

output from one level to another or the response to a step input.

3.1.9 Functional tests

. Functional tests are defined as those go, no-go tests which sequentially exercise a function (truth)

table or in which the device is operated as part of an external circuit and total circuit operation is tested.

3.1.10 Acquiring activity

. The acquiring activity is the organizational element of the Government which contracts for

articles, supplies, or services; or it may be a contractor or subcontractor when the organizational element of the Government

has given specific written authorization to such contractor or subcontractor to serve as agent of the acquiring activity. A

contractor or subcontractor serving as agent of the acquiring activity shall not have the authority to grant waivers, deviations,

or exceptions unless specific written authorization to do so has also been given by the Government organization.

3.1.11 Accuracy

. The quality of freedom from error. Accuracy is determined or assured by calibration, or reliance upon

calibrated items.

3.1.12 Calibration

. Comparison of measurement standard or instrument of known accuracy with another standard,

instrument or device to detect, correlate, report or eliminate by adjustment, any variation in the accuracy of the item being

compared. Use of calibrated items provide the basis for value traceability of product technical specifications to national

standard values. Calibration is an activity related to measurement and test equipment performed in accordance with

ANSI/NCSL Z540-1 or equivalent.

MIL-STD-883F

3.1.13 Precision

. The degree to which an instrument, device, assemblage, test, measurement or process exhibits

repeatability. Expressed statistically or through various techniques of Statistical Process Control (SPC). Term is used

interchangeably with "repeatability".

3.1.14 Resolution

. The smallest unit of readability or indication of known value in an instrument, device or assemblage

thereof.

3.1.15 Standard reference material (SRM)

. A device or artifact recognized and listed by the National Institute of

Standards and Technology (NIST) as having known stability and characterization. SRM's used in product testing provide

traceability for technical specifications. SRM's do not require calibration when used and stored in accordance with NIST

accompanying instructions. They are used as "certified materials".

3.1.16 Tolerance

. A documented range over which a specified value may vary.

3.1.17 Test accuracy ratio (TAR)

. A ratio of the tolerance of the device under test to the accuracy of the related

measuring or test instrument or to the accuracy of the correlation device/SRM.

3.1.18 Uncertainty

. An expression of the combined errors in a test measurement process. Stated as a range within

which the subject quantity is expected to lie. Comprised of many components including: estimates of statistical distribution

and results of measurement or engineering analysis. Uncertainty established with a suitable degree of confidence, may be

used in assuring or determining product conformance and technical specifications.

3.1.19 Susceptibility

. The point at which a device fails to meet the postirradiation end-point electrical parameter limits or

fails functionally during radiation exposure (e.g., neutron irradiation).

3.1.20 Class M

. Class M is defined as 1.2.1 compliant product or product built in compliance to Appendix A of MIL-PRF-

38535 documented on a Standard Microcircuit Drawing where configuration control is provided by the Government preparing

activity. Class M devices shall use the conditions specified in the test methods herein for class level B product.

3.1.21 Class level B and class level S

. 2 class levels are used in this document to define requirements for high reliability

military applications (Class level B) and space applications (Class level S). Class level B requirements contained in this

document are intended for use for Class Q, Class H, and Class M products, as well as Class B M38510 JAN slash sheet

product. Class level B requirements are also intended for use for product claimed as 883 compliant or 1.2.1 compliant for

high reliability military applications. Class level S requirements contained in this document are intended for use for Class V,

Class K, as well as M38510 Class S JAN slash sheet product. Class level S requirements are also intended for use for

product claimed as 883 compliant or 1.2.1 compliant for space level applications.

4. GENERAL REQUIREMENTS

4.1 Numbering system

. The test methods are designated by numbers assigned in accordance with the following system:

4.1.1 Classification of tests

. The tests are divided into four classes:

1001 to 1999 Environmental tests

2001 to 2999 Mechanical tests

3001 to 4999 Electrical tests

5001 to 5999 Test procedures

MIL-STD-883F

4.1.2 Revisions

. Revisions are numbered consecutively using a period to separate the test method number and the

revision number. For example, 4001.1 is the first revision of test method 4001.

4.1.3 Method of reference

. When applicable, test methods contained herein shall be referenced in the individual

specification by specifying this standard, the method number, and the details required in the summary paragraph of the

applicable method. To avoid the necessity for changing specifications which refer to this standard, the revision number

should not be used when referencing test methods. For example, use 4001, not 4001.1.

4.2 Test results

. The data resulting from application of any test method or procedure shall be reported in terms of the

actual test conditions and results. "Equivalent" results (e.g., equivalent 25°C device hours or failure rate derived from 125°C

test conditions) may be reported in addition to the actual results but shall not be acceptable as an alternative to actual

results. Results of any test method or procedure shall be accompanied by information on the total quantity of devices in

each lot being tested on a 100 percent or sampling basis, the associated quantity of devices in the sample for tests on a

sampling basis, and the number of failures or devices rejected by test method and observed mode of failure. In cases

where more than a single device type (part number) is involved in the makeup of a lot for inspection or delivery, the data

shall be reported as above but with a further breakdown by part number.

4.3 Test sample disposition

. Test sample disposition shall be in accordance with A.4.3.2.1 of Appendix A of MIL-PRF-

38535.

4.4 Orientation

4.4.1 Identification of orientation and direction of forces applied

. For those test methods which involve observation or the

application of external forces which must be related to the orientation of the device, such orientation and direction of forces

applied shall be identified in accordance with figures 1 and 2.

4.4.2 Orientation for other case configurations

. For case configurations other than those shown in figures 1 and 2, the

orientation of the device shall be as specified in the applicable acquisition document.

4.4.3 Orientation for packages with different size lateral dimensions

. In flat packages where radial leads emanate from

three or more sides, the X-direction shall be assigned to the larger and the Z-direction to the smaller of the two lateral

dimensions.