Siemens Standard

Green strength may be determined by measuring the lateral force that bonded parts can withstand. In one test method (Siemens Standard SN 59651)," a populated board is allowed to slide down an incline to a stop at the base, and the displacement of components on the board is measured (Figure 5.4). An acceleration run of 400 mm from a height of 35 mm is made. A maximum shift of 0.15 mm (50% of the track pitch for a standard 0.3 mm pitch part) is considered acceptable. ... 

Figure 5.4 Test fixture for measuring green strength. Source Siemens Standard Specification SN 59651.

IPC CA-821, General Requirements for Thermally Conductive Adhesives Jan. 1995. Adhesives for SMD Technology, Siemens Standard SN 59651 (Ed. 1997-09). 

Green strength may be determined by measuring the lateral force that bonded parts can withstand. In one test method (Siemens Standard SN59651 a populated board is allowed to slide down an incline to a stop... 

The purification method that has become a near-standard is the Siemens process, where hydrogen reduces SiCl or SiHCl on the surface of a resistance-heated (to about 1150°C) high purity siUcon rod. The rod is usually U-shaped to reduce the height of the furnace. The result is a siUcon ingot several cm in diameter and >2 m long. It is tempting to write the siUcon tetrachloride—hydrogen reaction as... 

XRF nowadays provides accurate concentration data at major and low trace levels for nearly all the elements in a wide variety of materials. Hardware and software advances enable on-line application of the fundamental approach in either classical or influence coefficient algorithms for the correction of absorption and enhancement effects. Vendors software packages, such as QuantAS (ARL), SSQ (Siemens), X40, IQ+ and SuperQ (Philips), are precalibrated analytical programs, allowing semiquantitative to quantitative analysis for elements in any type of (unknown) material measured on a specific X-ray spectrometer without standards or specific calibrations. The basis is the fundamental parameter method for calculation of correction coefficients for matrix elements (inter-element influences) from fundamental physical values such as absorption and secondary fluorescence. UniQuant (ODS) calibrates instrumental sensitivity factors (k values) for 79 elements with a set of standards of the pure element. In this approach to inter-element effects, it is not necessary to determine a calibration curve for each element in a matrix. Calibration of k values with pure standards may still lead to systematic errors for unknown polymer samples. UniQuant provides semiquantitative XRF analysis [242]. 

Using three spherical crystals - the standard ylide crystal provided by Siemens Analytical Instrumentation, ruby and ammonium hydrogen tartrate (Enraf-Nonius standard crystal) - such an experiment has been carried out using two SMART CCD diffractometers. Before integration [8], all of the cell axes were multiplied by 2. Duplicate measurements were then averaged, and all odd reflections with values of F2 > 15 esd s were compared with the reflection with double the indices to obtain the best value of k for the expression F kl = kF h2k2). The average values of k obtained for the two diffractometers were 0.0014(2) and 0.00106(5). 

Sand samples were dried at 110 °C and treated with lithium meta and tetraborate to make pressed powder pellets. They were analysed using a X-ray fluorescence Siemens SRS3000 equipment for major and trace elements. For major and trace elements precision is valuated in terms of relative standard deviation being < 1% (Sutarno Steger 1985). 

In a situation where metastable phases are to be investigated, data can be taken under pressure-temp conditions other than standard. For this, type of measurement, the high temp Siemens system or the high pressure McWhan or Bassett cameras can be used... 

Detector, with active length = 2.122 °, was used. 0/20 scans were reorded from 4 to 70 0 20 (step size=0.017° time=50 s per step). The evaluation of crystalline phases was carried out using the DIFFRACT/AT program by Siemens, which includes the Joint Committee of Powder Diffraction Standards (JCPDS) data bank. 

Table 6.21 tE values of cage induction motors (thermal class F, 50 cps, for temperature classes T1/T2 and T3) (by courtesy of Siemens AG, Standard Drives Division, Erlangen/Germany)... 

---