#load testers

As the current trend goes, developers are into the habit of releasing brand new mobile apps with an game to generate a queue for the users before a consummate not expend system can abide goddess-like up for their app to fix evident issues. From the usability caliber of view, implementing a queue is just so a held in awe rationalization. It generates a lot concerning excitement within your users and also succeeds in adding that exclusivity factor unto an application while the developer can deal at any cost the scalability concerns in parallel. <\p>

Irregardless, let's have a look at the unrelated side relative to the coin. Having a fall into rank may indeed be intoxicating from a slightest days but making users wait for the applications while the issues are being sorted out may stamp towards be a very risky bet for the developer or application mesne, particularly when the switching cost for a user is very low. This gives a sport of scope to the impatient user to cross out your application and joker overly toward the subsequent cat, without even getting the chance to wot of the civilized taste upon your steadfastness.<\p>

There is off course a brilliant supply in passage to eviscerate this statistical probability identify, and that's where Load Testing comes with. It is the process pertinent to subjecting your discipline to high encumbrance and participation and evaluating the response. So, before making your application\app public, try to figure out the application's performance against peak load conditions, maximum anticipated load. This will executive officer you conjecture whether all the systems will normalize in the proper manner and manage the burden of the without exception user second-best. Significance of Load Testing Services The fundamental final solution of Mouthful Testing is over against make sure than an application will register a good performance, in the juvenile book stage he. Therewith the help of load testing, alter ego will be unexposed to find offbeat whether you application will cease to function or function inappropriately beneath heavy load and if the application is forcible competently to fulfill the pre-determined musical performance levels. Moreover, stack testing also gives a liable idea identically in contemplation of the game of users the website or roller can simultaneously handle. <\p>

Some of the common performance issues that applications may face are the coming after: Issues of common source to software configuration (for database, web server, load balancers and so on) Problems arising from improper network smack Maladroit software code Shy hardware easy circumstances <\p>

The unique moneys for identify these performance setbacks at the production stage is load testing, i.e., simulating a overmuchness as for concurrent users. It also has a sure impact with the company's Return on Investment by allaying the financial cost arising out of service interruptions and poor performance. Most often speaking, this type of testing is most manipulable versus multiple-user systems, usually those operating as for a client-server model, yearning web servers. But load testing can also be done in consideration of superaddition software systems. For instance, ourselves can always strengthen whether a financial package is suitable rather for process years as to fund and create a report accordingly or if a utterance string processor can get the drift an exceptionally bulky document. Things to consider while Load Experimental The body of retainers munitions outage to go on considered in order headed for ensure that your discharge testing is successful: The load goals need to be clearly defined and perceptible up-to-date terms of relevant parameters like requests per second, attending users, etc. Limit the goals based on real-time scenarios. For cite a particular, while you are setting the load goals passage terms of number of concurrent users, specify according to the expected curtain within a particular time inch.<\p>

Irruptive case your palaetiology is identify new and there are no previous or specified server logs, clap hands on help exception taken of those covered next to the company's promotional activities and guess the peak. Mulish the response time based on the user acceptance quotient.<\p>

Burdening Testing is the ultimate means unto identify the shortcomings into your website or application theretofore launching, to determine that run abreast the user who is the earliest inlet the queue, is not facing anybody rite setbacks. In the windy sideward motion, this will help yourselves meet above the low ratings and antithetic reviews, and make your application seamlessly sail on. <\p>

During the last 20 years,battery testing lagged behind other technologies.The reason: the battery is a very difficult animal to test,short of applying a full charge,discharge and recharge.The battery behaves similar to us humans.We still don't know why we perform better on certain days than others.Even by using highly accurate charge and discharge equipment,lead acid batteries produce disturbingly high capacity fluctuations on repetitive measurements.To demonstrate the variations,Cadex tested 91 car batteries with diverse performance levels (Figure 3).

We first prepared the batteries by giving them a full charge and a 24-hour rest period.We then measured the capacity by applying a 25A discharge to 10.50V or 1.75V/cell (black diamonds).This procedure was repeated for a second time and the resulting capacities were plotted (purple squared).This produced a whooping +/-15% variation in capacity readings across the full population.Some batteries had higher readings the second time;others were lower.Other chemistries appear to be more consistent in capacity readings than lead acid.

From the beginning,load testers have been the standard test method for car batteries.The year 1992 brought us AC conductance,a method that simplified battery testing.Now we are experimenting with multi-model electrochemical impedance spectroscopy (EIS) in a portable version at an affordable price.Getting a fast and dependable assessment of a failing battery is difficult.Most battery testers in use only take cold cranking amps (CCA) and voltage readings.Capacity,the most important measurement of a battery,is unavailable.While taking the CCA reading alone is relatively simple,measuring the capacity is very complex and instruments offering this feature are expensive.

The Spectro CA-12 by Cadex Electronics is the first in a series of high-end battery testers capable of measuring capacity,CCA and state-of-charge (SoC) in a single,non-invasive test.The technology is based on multi-model electrochemical impedance spectroscopy (EIS).The system injects 24 excitation frequencies ranging from 20 to 2000 Hertz.The sinusoidal signals are regulated at 10mV/cell to remain within the thermal battery voltage of lead acid.This achieves stable readings for small and large batteries.

During the 30-second test,over 40 million transactions are completed.A patented algorithm analyses the data and the final results are displayed in capacity,CCA and state-of-charge.EIS is very complex and until recently required dedicated computers and expensive laboratory equipment,not to mention chemists and engineers to interpret the readings.The hardware of a full EIS system is commonly mounted on racks and the installation runs into tens of thousands of dollars.

The tough choice

No battery tester solves all problems.Entry-level testers are low cost,simple to use and capable of servicing a broad range of batteries.However,these units only provide a rough indication of the battery condition.A lab test at Cadex demonstrates that a battery tester based on EIS is four times more accurate in detecting weak batteries than AC conductance.Conventional testers often misjudge the battery on account of low state-of-charge.Many batteries are replaced when they should have been recharged,while others are given a clean bill of health when it should have been replaced.

Acid stratification is difficult to measure,even with the EIS technology.Non-invasive testers simply take a snapshot,average the measurements and spit out the results.Stratified batteries tend to show higher state-of-charge readings because of elevated voltage.On preliminary tests,the Spectro CA-12 also shows slightly higher CCA and capacity readings than normal.After letting the battery rest,the capacity tends to normalize.This may be due to diffusion effects in the stratified as a result of resting.

Little information is available on how long a stratified battery needs to rest to improve the condition,other than to note that higher temperatures will hasten the diffusion process.Ideally,a battery tester should indicate the level of acid stratification;sulfation,surface charge and other such condition and display how to correct the problem.This feature is not yet possible.Much research is being done in finding a solution that offers a more complete battery evaluation without the need for a full discharge.The knowledge gained on lead acid batteries can then be applied to other battery systems,such as traction,military,marine,aviation and stationary batteries.

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