Chapter 3 Functions and Operations

FREQ/DIST Displays the frequency or distance menu depending on the measurement mode.

Frequency Provides for setting sweep frequency end points when FREQ mode is selected.

MenuSelected frequency values may be changed using the keypad or Up/Down arrow key.

￿F1 — Opens the F1 parameter for data entry. This is the start value for the frequency sweep. Press ENTER when data entry is complete.

￿F2 — Opens the F2 parameter for data entry. This is the stop value for the frequency sweep. Press ENTER when data entry is complete.

Distance Provides for setting Distance to Fault parameters when a DTF mode is selected.

MenuChoosing DIST causes the soft keys, below, to be displayed and the correspond- ing values to be shown in the message area. Selected distance values may be changed using the keypad or Up/Down arrow key.

￿D1 — Opens the start distance (D1) parameter for data entry. This is the start value for the distance range. Press ENTER when data entry is complete.

￿D2 — Opens the end distance (D2) parameter for data entry. This is the end value for the distance range. Press ENTER when data entry is complete.

￿DTF AID — Provides interactive help to optimize DTF set up parameters. You will be prompted for system parameter values of maximum distance, fre- quency span, and propagation velocity.

￿MORE — Selects the Distance Sub-Menu, detailed below.

Distance Provides for setting the cable loss and relative propagation velocity of the coax-

Sub-Menuial cable. Selected values may be changed using the Up/Down arrow key or key- pad.

￿LOSS — Opens the Cable Loss parameter for data entry. Enter the loss per foot (or meter) for the type of transmission line being tested. Press ENTER when data entry is complete. (Range is 0.000 to 5.000 dB/m)

￿PROP VEL (relative propagation velocity) — Opens the Propagation Veloc- ity parameter for data entry. Enter the propagation velocity for the type of transmission line being tested. Press ENTER when data entry is complete. (Range is 0.010 to 1.000)

￿CABLE — Opens a common coaxial cable folder and custom coaxial cable folder. Select either folder and use the Up/Down arrow key and ENTER key to make a selection. This feature provides a rapid means of setting both cable loss and propagation velocity. (Refer to Appendix A for a listing of common coaxial cables showing values for “Relative Propagation Velocity” and “Nominal Attenuation in dB/m @ 1000 MHz”.) The custom cable folder con- sists of up to 49 user-defined cable parameters downloaded via the Site Mas- ter Software Tools program.

￿WINDOW — Opens a menu of FFT windowing types for the DTF calcula- tion. Scroll the menu using the Up/Down arrow key and make a selection with the ENTER key.

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Anritsu S251B manual Functions and Operations
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S251B specifications

The Anritsu S251B is a state-of-the-art handheld spectrum analyzer designed for wireless communication applications. This compact yet powerful device is engineered to provide engineers and technicians with versatile and reliable measurements in both field and laboratory environments. Its lightweight design, weighing under 1.5 kilograms, allows for easy portability, making it an ideal solution for on-site testing.

One of the standout features of the S251B is its frequency range, which spans from 100 kHz to 6 GHz. This broad coverage is essential for monitoring various wireless technologies, including LTE, Wi-Fi, Bluetooth, and many others. The exceptional resolution bandwidth options from 1 kHz to 1 MHz help in detecting weak signals and interference, ensuring that users can analyze signals with precision.

The S251B utilizes advanced digital signal processing (DSP) technology, which significantly enhances measurement accuracy and speed. This allows for real-time spectrum analysis, ensuring that users can quickly identify and troubleshoot issues. The device supports a range of measurement applications, including spectrum analysis, interference analysis, and channel power measurements, making it a versatile tool for many scenarios.

For ease of use, the analyzer features a bright, color display that provides clear visibility in various lighting conditions. The intuitive graphical user interface enables quick navigation through settings and configuration options. Additionally, the S251B is equipped with a long-lasting battery that provides hours of continuous operation, further enhancing its suitability for field applications.

Connectivity is another key area where the Anritsu S251B excels. It offers USB and Ethernet ports for easy data transfer and remote control capabilities. This feature is particularly useful for engineers who need to integrate the analyzer into automated testing setups or require remote access for more profound analysis.

Moreover, the S251B is designed with ruggedness in mind. It is built to withstand the challenges of field use, including dropping and exposure to various environmental conditions, ensuring reliable performance even in demanding situations.

In conclusion, the Anritsu S251B handheld spectrum analyzer combines portability, advanced measurement techniques, and durability. With its wide frequency range, user-friendly interface, and connectivity options, it is a vital tool for professionals involved in the testing and deployment of wireless communication systems. Its robust capabilities make it an impressive asset for troubleshooting, maintenance, and installation tasks in the field.
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