IEC 61189-1:2001 pdf download

IEC 61189-1:2001 pdf download.Test methods for electrical materials,
interconnection structures and assemblies – Part 1:General test methods and methodology.
3.1 Accuracy
The regime by which routine calibration of the test equipment is undertaken shall be clearly stated in the quality documentation of the supplier or agency conducting the test, and shall meet the requirements in ISO 9002, subclause 411,
The calibration shall be conducted by an agency having accreditation to a national or International measurement standard institute. There should be an uninterrupted chain of calibration to a national or international standard.
Where calibration to a national or international standard is not possible, round robin techniques may be used, and documented, to enhance confidence in measurement accuracy.
The calibration interval shall normally be one year. Equipment consistently found to be outside acceptable limits of accuracy shall be subject to shortened calibration Intervals. Equipment consistently found to be well within acceptable limits may be subject to relaxed calibration Intervals.
A record of the calibration and maintenance history shall be maintained for each instrument. These records should state the uncertainty of the calibration technique (in ± % deviation) in order that uncertainties of measurement can be aggregated and determined.
A procedure shall be implemented to resolve any situation where an instrument is found to be outside calibration limits.
3.2 Precision
The uncertainty budget of any measurement technique is made up of both systematic and random uncertainties. All estimates shall be based upon a single confidence level, the minimum being 95 %.
Systematic uncertainties are usually the predominant contributor, and will include all uncertainties not subject to random fluctuation. These include:
– calibration uncertainties
— errors due to the use of an Instrument under conditions which differ from those under which It was calibrated;
— errors In the graduation of a scale of an analogue meter (scale shape error).
Random uncertainties result from numerous sources but can be deduced from repeated measurement of a standard item. Therefore, it is not necessary to isolate the individual contributions. These may include:
— random fluctuations such as those due to the variation of an influence parameter. Typically. changes in atmospheric conditions reduce the repeatability of a measurement;
– uncertainty in discrimination, such as setting a pointer to a fiducial mark, or Interpolating between graduations on an analogue scale.
5.2 Test 1P02: Pre-conditioning, 125。C
5.2.1
Object
To dry the specimen to such an extent that results will not be influenced by moisture in the
material.
5.2.2
Test specimen
As specified in the relevant test method.
5.2.3
Test apparatus and materials
Air circulating oven capable of maintaining a temperature of(125土5)。C.
5.2.4
Procedure
Pre-condition the specimen for a period as specified in the relevant specification.
Let the specimen cool down under standard atmospheric conditions until its temperature is less
than 35。C. Recovery time shall, in no case, exceed 8 h.
5.2.5
Report
The report shall include:
a) the test number and revision index;
b) the date of the test;
c) pre-condition time;
d) the identification of the materials;
e) any deviation from this test method.
5.2.6
Additional information
None
5.3 Test 1P03: Accelerated ageing, conditioning of printed boards — Method A
5.3.1 Object
The object of this procedure is to condition printed boards in a steam/oxygen atmosphere as an
accelerated ageing procedure where a short overall test duration of the procedure is desirable. The accelerated ageing conditions described in this test method have been demonstrated to be equivalent to a 10-day damp heat conditioning as detailed in IEC 60068-2-3: Test Ca. or IEC 60068-2-30: Test Db.
The test is intended to give information about the effect of storage duration on the solderability of printed boards
An alternative acceptable conditioning technique is detailed in 5.4 as test method 1P04.
In case of dispute between the two alternative techniques, the referee method shall consist of exposure to the climatic conditions described in IEC 60068-2-3: Test Ca. or IEC 60068-2-30 Test Db. for a duration of 10 days
5.3.2 Test specimen
The test specimen shall be as described in the appropriate sectional specification (SS) or customer detail specification (CDS) procurement documentation. The physical size of the conditioning and test apparatus Is also a limiting factor.
5.3.3 Test apparatus and materials
The following test apparatus and materials shall be used:
• steam/oxygen ageing test apparatus (see figure 1);
• test chamber:
The chamber should be constructed to permit test specimens to be readily placed on an enclosed holder (carousel) during the test. The chamber should have a thermal insulating jacket and shall be constructed from materials which will not contaminate the test atmosphere, such as borosilicate glass or stainless steel.