Chapter 4 Measurements

DTF Measurement

The following distance domain measurement is an example of a Distance-to-Fault (DTF) measurement over a selectable distance range.

Required Equipment

￿Site Master Model S251B

￿Precision Open/Short, Anritsu 22N50 and Precision Load, Anritsu SM/PL

or

Precision Open/Short/Load, Anritsu OSLN50LF

￿Test Port Extension Cable, Anritsu 15NNF50-1.5A

Device-Under-Test Specification

Type

Typical Loss @1.5m

Vg

Return

SWR

Loss

 

 

 

 

 

 

 

 

 

 

0.4 dB @ 625 MHz

 

 

 

15NNF50-1.

0.5 dB @ 800 MHz

 

 

 

0.6 dB @ 1000 MHz

0.86

￿ 21 dB

￿ 1.20

5A

0.7 dB @ 1500 MHz

 

 

 

 

0.8 dB @ 2000 MHz

 

 

 

 

0.9 dB @ 2500 MHz

 

 

 

 

 

 

 

 

Procedure

Step 1. Press the ON/OFF key on the Site Master.

Selecting the Measurement Mode

Step 2. Press the MODE key.

Step 3. Use the Up/Down arrow key to scroll to DTF-SWRor DTF-RETURN LOSS.

Step 4. Press the ENTER key to select DTF-SWR or Return Loss measurement mode. If the Site Master has not been calibrated (CAL OFF displayed in the upper left of the display), the DTF AID parameter table will appear.

NOTE: Where CAL ON is indicated on the Site Master, pressing the DTF AID soft key will activate the DTF parameter table. However, distance and cable type (propagation velocity and loss) have not been optimized. F1 and F2 are set by “CAL ON” setup. DTF measurement is valid for D2 ￿ Dmax (as defined by F2 and F1).

The number of data points (resolution) will automatically adjust according to the length of D2.

Step 5. Use the Up/Down arrow key to scroll to D2, then press ENTER to select the ca- ble length.

Step 6. Enter 2 using the keypad or the Up/Down arrow key. Press ENTER to set D2 to 2.0 meters.

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Anritsu S251B manual DTF Measurement, Loss

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.