Chapter 4 Measurements

SWR or Return Loss Measurement

Step 15. Disconnect the Load and connect the test port extension cable to the Site Master test port.

Step 16. Connect the Load to the open end of the test port extension cable as shown in Figure 4-9.

OPEN

SHORT CALIBRATION

LOAD

LOAD

SHORT

MEASUREMENT

RFOUT/REFLECTION

TEST PORT

Site Master S251B

1

START

CAL

3

SAVE

SETUP

5

LIMIT

7

SAVE

DISPLAY

9

625.0

 

 

2500.0

1384.45

MHz

 

 

2096.66

MHz

 

ON

 

 

 

OFF

MODE

FREQ/DIST

AMPLITUDE

SWEEP

ESCAPE

2CLEAR

AUTO

SCALE

4

RECALL

SETUP

6

MARKER

ENTER

8

RECALL RUN

DISPLAY HOLD

0 +/-

PRINT

SYS

.

Figure 4-9. Cable Measurement Test Setup

Step 17. Observe the displayed measurement. Figures 4-10and 4-11show typical SWR and Return Loss measurements with markers and limit line set.

Set the Amplitude Scale and Limit Line

The following procedure sets the top and bottom scale display.

Step 18. Press the AMPLITUDE or LIMIT key to call up the Scale Menu.

Step 19. In SWR mode, press the TOP soft key and enter 1, ., 3 using the keypad or Up/Down arrow key. Press ENTER to set the top scale. (In Return Loss mode, enter 0.)

Step 20. In SWR mode, press the BOTTOM soft key and enter 1 using the keypad or Up/Down arrow key. Press ENTER to set the bottom scale. (In Return Loss mode, enter 5, 4.)

Step 21. Press the LIMIT soft key to activate the segment limit line table.

Step 22. Use the Up/Down arrow key to scroll to segment #1 and press the EDIT SEGMENT soft key to change the parameter values for segment #1.

Step 23. Use the Up/Down arrow key to scroll to the START FREQ parameter and press ENTER to edit the value.

4-11

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Image 57
Anritsu S251B manual SWR or Return Loss Measurement, Set the Amplitude Scale and Limit Line

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.