In the mobile phone industry, where technology is becoming increasingly complex and profit margins are shrinking, testing must be fast, flexible, and effective to ensure that production lines can meet profitable volume requirements. By utilizing test instruments equipped with advanced software and hardware, along with various test modes, manufacturers can perform a wide range of tests efficiently. These tools enable quick and accurate measurements, which are essential for meeting the quality standards of 3G devices.
Today’s wireless handsets require more precise and rigorous testing than ever before. Engineers tasked with maintaining quality on the production line need more than just accuracy—they need systems that can adapt quickly to changing demands. As the mobile phone market becomes more competitive, test procedures must be optimized to support high-volume production while maintaining profitability.
Modern test instruments, featuring advanced hardware and software, allow for fast and accurate measurements across a broad range of mobile devices. New generation equipment not only speeds up the process but also provides more detailed analysis, improving throughput and cost-effectiveness in mobile phone manufacturing.
In fact, advanced test instrumentation enables engineers to implement traditional R&D tests within a manufacturing environment. Having deeper testing capabilities on the production line is crucial, as it helps identify potential issues or allows for minor adjustments to component tolerances, ultimately enhancing product reliability.
In short, ensuring the quality required for third-generation products goes beyond simple pass/fail measurements. Without thorough testing, manufacturers risk losing customers. It’s essential to detect even small errors that may occur during the manufacturing process, especially those affecting critical components.
To detect minute changes in wireless signals, test instruments must perform fast and detailed analysis. The latest test platforms integrate ASICs, unique DSP technology, and CPUs to enhance measurement speed and accuracy. Most modern test instruments used for wireless devices have at least three digital signal processors (DSPs): one for signal measurement and averaging, another for debug processing (such as base station emulation), and a third for controlling the display, front panel, and computer interface.
The speed and power consumption of the DSP are key factors influencing the performance of a test instrument. Other important elements include the internal bus speed connecting the processors and the efficiency of the software architecture.
Averaging is an essential feature in many test scenarios. Although this process takes more time, it improves repeatability, which leads to stricter specifications and greater advantages for manufacturers. For example, higher repeatability allows for the use of lower-cost components, reducing overall device costs. It also increases yield and profitability.
The number of averages required depends on the specific measurement, the device under test (DUT), and the stability of the test results. In some cases, up to 20 averages may be needed to achieve consistent and reliable outcomes. Each average involves multiple samples, and each of those samples is itself an average of several pulses.
In a 20-average test case, a wideband CDMA handset was tested in loopback mode 2 (as shown in Figure 1). The power control bit pattern was set to all 1s, and the phone’s maximum output power was just below 24dBm, indicating a power class 3 device. The specification requires a maximum output power of 24dBm with an error margin of +1dBm to -3dBm.
The 20 averages covered transmit power, frequency error, and occupied bandwidth. The filtered power measurement was conducted using a root raised cosine filter, and both the user equipment and UTRAN (UMTS Terrestrial Radio Access Network) were configured on the receiver.
Another way to improve efficiency in production is by testing two phones at the same time. This parallel testing approach not only saves time and money but also reduces space and resource usage. With this feature, a single tester can evaluate two devices simultaneously, even if they operate on different wireless standards. This setup can reduce costs by up to 30% by lowering power consumption, cabling needs, and the number of instruments required. It also boosts throughput and optimizes floor space.
As seen in Figure 1, the test instrument had a wideband CDMA handset in loopback mode 2. The power control bit pattern was set to all 1s, and the phone’s maximum output power was just below 24dBm. A total of 20 averages were performed, covering transmit power, frequency error, and occupied bandwidth.
USB Countdown Timer Socket
Function description
The
socket is ordinary converter,with two output 5V2A power USB power
supply at the same time,can be very convenient in use electrical
appliances and recharge the equipment at the same time,such as digital
products like Iphone Ipad,MP3,MP4 etc.The charge apply to full range of
international AC output,no-load power consumption less than 0.3W,with
short circuit,overload,over-voltage protection,can be convenient for
your life and save more energy
Timer Control Time Adgustment
1.Press the power switch 1 time,the 1HOUR LED will light on.The Timer into ON mode,USB and control socket output ON .
2.Continuously
press the power switch the LED light on,the Countdown mode and LED
light on will cycle change from 1HR,2HR,4HR,6HR,8HR,10HR.
3.Choose
you need countdown time mode,the mode LED will lighto on,start
countdown until countdown time finish,the control output and USB change
to OFF
4.Then the countdown is start,The Time indicate LED will from high to low auto change until Countdown finish off.
Failure analysis:
1.check whether the power supply connection is good
2.check whether the USB cable is loosen
Warning Note:
1.Use indoor and dry location ONLY
2.The load max does not exceed 15A 3600W
3.This product does not convert voltage please do not miss use DO NOT exceed the maximum loading of 3600 Watts 15A
4.Always have earth connection for safety reason
5.If in doubt please consult with a qualified electrician
USB Countdown Timer, USB Countdown Timer Socket, USB Timer, USB Charger Timer, USB Timer Socket
NINGBO COWELL ELECTRONICS & TECHNOLOGY CO., LTD , https://www.cowellsockets.com