Chapter 4 Measurements

Cable Loss Measurement

The following frequency domain measurement is an example of a Cable Loss measurement made over a selectable frequency range following the Marker setting steps 32 to 35.

NOTE:

If SWR/Return Loss measurement has not been done, calibration must be per- formed before determining the cable loss.

Step 36. Disconnect the load from the end of the cable and replace it with a short.

Step 37. Press the MODE key.

Step 38. Use the Up/Down arrow key to scroll to CABLE LOSS - ONE PORT.

Step 39. Press ENTER to select Cable Loss measurement mode.

Setting the Amplitude Scale

The following procedure sets the scale display.

Step 40. Press the AMPLITUDE key to call up the Scale Menu.

Step 41. Press the TOP soft key and enter 0 using the keypad or Up/Down arrow key. Press ENTER to set the top scale.

Step 42. Press the BOTTOM soft key and enter 1 using the keypad or Up/Down arrow key. Press ENTER to set the bottom scale.

NOTE:

An alternative method of setting the amplitude scale is to use the AUTO SCALE key.

Setting the Segment Limit LInes

The following procedure sets the segment limit lines.

Step 43. Press the AMPLITUDE or LIMIT key to call up the Segment Limit Line menu. Step 44. Press the LIMIT soft key to activate the segment limit line table.

Step 45. Use the Up/Down arrow key to scroll to segment #1 and press the EDIT SEG- MENT soft key to change the parameter values for segment #1.

Step 46. Use the Up/Down arrow key to scroll to the START FREQ parameter and press ENTER to edit the value.

Step 47. Enter 8, 2, 4 using the key pad or the Up/Down arrow key. Press ENTER to set the Start Frequency to 824 MHz.

Step 48. Use the Up/Down arrow key to scroll to the START FREQ LIMIT parameter and press ENTER to edit the value.

Step 49. Enter ., 5. Press ENTER to set the Start Frequency Limit value.

Step 50. Use the Up/Down arrow key to scroll to the STOP FREQ parameter and press ENTER to edit the value.

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Anritsu S251B manual Cable Loss Measurement, Setting the Segment Limit LInes
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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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