AV6418 OTDR 

Product Summaries
    AV6418 OTDR is a high performance measuring instrument with multifunction designed for testing FTTx network. It’s mainly used to measure the physical characteristics of optical fiber under test, such as the length,the transmission loss and the splice loss etc.. It can also locate the faults or breaks of optical fiber. It's widely applied in the manufacture, construction and maintenance in optical fiber communication system.
Mainly features
    Handheld,lightweight and convenience for carrying
    45dB high dynamic range
   ≤1m extra-short event dead zone
    0.05m high distance resolution,128k sampling points
    Fast auto measurement,one-button operating
    Test up to four wavelengths with a single unit
    Communication light check automatically
    Remote function via Ethernet
    Double USB interfaces, supporting USB stick and printer and direct cable download to PC via ActiveSync 
    Supporting Bellcore GR196 file format in writing or reading
    Built-in lithium battery with high capacity for over 8 hours of operating life
    Visible fault locating (VFL) and optical power meter
    Universal FC/PC,FC/SC,FC/ST connector type, it's convenient for surface cleaning
    Unique function of updating application software on-line, returning to factory is unnecessary

Typical application: 

AV6418 OTDR is mainly used to measure FTTx network, it provides multifunctions in one unit. AV6418 offers three measuring modes: manual mode (including real time mode and average mode), auto mode and dead zone mode.
    Manual measurement mode: manual mode is suitable for skilled operator who is familiar with the instrument. In this measurement mode, to get more accurate results, real-time mode or average mode can be selected if necessary.
    In real-time mode, the dynamic changes of fiber chain can be detected timely, it is very useful when you need to observe the effect and process of fiber being spliced or connected.
    In average measurement mode, the noise in trace can be suppressed, and the SNR(signal noise ratio) is improved, therefore,the result is more accurate. In fact, the more average times is executed, the more noise in trace is suppressed, and the longer time is spent for signal processing. In practice, the average times should be set properly according to necessity.
    Auto measurement mode: the optimized measurement conditions are set automatically, it's unnecessary to operator to know about the complicated background knowledge and the further details of operating. In this mode, the more accurate results can be gained when proper average times are set, but it will increase the time of signal processing.
    Dead zone mode: this mode is suitable for testing optical fiber with short distance and the optimized settings of distance range, pulse width and attenuator can be executed automatically. To get the best result, the terminal return loss should be guaranteed less than -40dB.