Hardware tests

Proving test hardware, comparative references, and test software (4.11.1.1)... 

Where test software or comparative references such as test hardware are used as suitable forms of inspection, the standard requires that they be checked to prove that thep are capable of verifying the acceptabilify of product prior to release for use during production, installation, and servicing and shall be rechecked at prescribed intervals. The standard also requires the supplier to establish the extent and frequency of such checks and to maintain records as evidence of control. 

The standard requires the supplier to safeguard inspection, measuring, and test facilities including both test hardware and test software from adjustments which would invalidate the calibration setting. 

There are two other related sources of environmental disturbances, seismic and acoustic vibration. Optical testing facilities should be located far from highways and railroad lines. The test hardware should be isolated from the building structure to avoid seismic disturbances. Acoustic disturbances are often overlooked and can be a bigger problem than seismic. Loud noises of any sort are a problem. The sub normal hearing frequency noise made by many air conditioning and handling units is often an unforeseen problem. 

Test hardware (e.g., jigs, fixtures, templates, and patterns) or test software is checked to ensure capability of verifying the acceptability of the product, prior to release, for use during production or installation. Such hardware and software is controlled by periodic checks. Records are maintained. 

Test hardware/peripherals Test software modules Test integrated software code... 

Development of accelerated testing hardwares and procedures which duplicate degradation observed under outdoor conditions. 

Upon completion of the Porton Down tests and closure of the site, the TDC system was prepared for shipment to Crescent City, Illinois, for storage. In December 2007 and January 2008, the system was prepared for shipment to Schofield Barracks in Hawaii. Several flexible connections were replaced. The flow control valves on the 3-in. and 10-in. pipes between the expansion tank and the air pollution control system were rebuilt. Tests were run using simulated equipment test hardware for 155-mm projectiles and 4.2-in. mortars in preparation for operations at Schofield Barracks. Planning was done for destruction of 155-mm projectiles in Hawaii the TDC had not previously destroyed... 

More recently, particularly in discussions of various NACE or ASTM working groups, one encounters the terminology of test method. By this term one generally understands the combination of test (hardware) and the apphcations of it, which includes the preparation of the solutions, the metallurgy, the preparation of the test specimen, the monitoring of what happens during the test period, and the final evaluation of the results. Many of these steps have been standardized in various standards [11-21]. 

Wear related or abrasion related problems can only be determined by actually testing hardware in hill scale service. Accelerated tests have not proven successful in reflecting most service and performance. 

Software module and integration testing Hardware integration testing Software validation... 

Validation plan version Tested hardware and software version Test specification version Each SIF function number referenced to SRS Tools and equipment used Calibration data for each of the foregoing Result of each test... 

PEM fuel cells are in development to be ultimately deployed in the real world. The real world can vary considerably, from indoor use in buildings or warehouses to outdoor use under arctic conditions. Load variations can vary from continuous idle with occasional periods at maximum power for backup power systems, to highly dynamic operation in transport applications or working at continuous power for Combined Heat and Power systems. The level of control over all relevant parameters can be limited in a fuel cell system, and malfunctioning of control hardware can lead to conditions that fall outside the intended operating window. When compared to testing an MEA in a fuel cell laboratory in test hardware that excludes all influences but those deliberately applied by the operator, a large number of imperfections can be listed ... 

To confirm that the performance gain using the 450 screen over the 510 screen was indeed true, and not due to faulty equipment or experimental apparatus, bubble point tests were again repeated in both pure and mixture fluids a second round to ensure repeatability. No significant deviations in the results were noted. In addition, test hardware was inspected again. The screen samples were again analyzed under the SEM microscope to... 

Screen channel LAD performance in high-pressure propellant tanks may be affected by the degree of propellant subcooling and type of gas used during pressurization or liquid expulsion. Therefore it was ensured that bubble point data was collected over the widest possible range of thermal conditions inside a LOX propellant tank, consistent with the limitations of the test hardware. Therefore, the purpose of this chapter is to conduct an in-depth analysis on these high-pressure bubble point tests to understand parameters that affect LAD performance in an elevated pressure environment. 

Recent depot design concepts are in Section 1.6.2. Note that for all missions referenced, working pressure typically falls in the range of 200-345 kPa (30-50 psia). Depending on the pressiuization system used, either with a non-condensable gas such as GHe or condensable with GH2, the LAD may need to operate in liquid as warm as the saturation temperature at 275 kPa (40 psia). Therefore the facility and test hardware here was modified to service IH2 across the range of temperatures, pressures, and flow rates listed to eclipse the first two architectures and reach the third architecture in Table 9.1 (assuming a four LAD arm configuration for Centaur to CRYOTE-OTE transfer). 

After all test hardware was assembled and moimted inside the test tank, the tank was mounted from a vacuum chamber (VC) lid as shown in Figures 9.1 and 9.4. As shown, multiple feedthroughs were required to conduct this test. Each test had a dedicated liquid outflow line, along with feedthroughs for liquid fill, drain, and vent, pressure, temperature, and flow rate instrumentation, two cameras and light sources, and heaters. The outflow lines for FTS and vertical outflow tests were VI lines to minimize heat leak and reduce complications due to two phase flow measurement. As of June 2015, this was by far the most complex test ever performed at the SMiRF facility. 

A test witness is a person acting as an on-the-scene observer of the performance of a test with the purpose of verifying compliance with project requirements. On some programs, a system safety engineer is required to witness testing hardware and/or software that is safety-related. 

All the FLHT tests used hardware that is similar in design and followed similar test operations. Overall, the test hardware was designed to accomplish the following 1) provide for a controlled coolant boilaway 2) accommodate temperatures at least as high as 2500K within the fuel bundle ... 

Most of this chapter has been devoted to test hardware, but software is also important, and requires its place in the overall test plan, schedule, and budget. 

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