Chapter 5

Spectrum Analyzer

Measurements

Introduction

This chapter provides a description of field measurements available when the Model S114C or S332C Site Master is in Spectrum Analyzer mode.

Occupied Bandwidth

A common measurement performed on radio transmitters is that of occupied bandwidth (OBW). This measurement calculates the bandwidth containing the total integrated power occupied in a given signal bandwidth. There are two different methods of calculation de- pending on the technique to modulate the carrier.

￿99% Method — The occupied frequency bandwidth is calculated as the bandwidth containing 99% of the transmitted power.

￿X dB Down Method — The occupied frequency bandwidth is defined as the band- width between the upper and lower frequency points at which the signal level is X dB below the peak carrier level.

Required Equipment

￿Site Master Model S114C or S332C

￿30 dB, 50 Watt, bi-directional, DC –18 GHz, N(m) – N(f), Attenuator, 42N50A-30

￿Test Port extension cable, Anritsu 15NNF50 – 1.5C

Procedure

 

5

 

Step 1. Using the test port extension cable and 30 dB attenuator connect the Site Master

 

 

 

to the RF_Out test port.

 

 

Step 2.

Press the ON/OFF key on the Site Master.

 

 

Step 3. Press the MODE key.

 

 

 

 

 

 

Step 4. Use the Up/Down arrow key to select the Spectrum Analyzer mode and press

 

 

 

ENTER.

 

 

Step 5. Enter the center frequency of the measurement.

 

 

Step 6. Select the appropriate frequency span, reference level, input attenuation level,

 

 

 

resolution bandwidth, and video bandwidth.

 

 

Step 7.

Press the MEAS key.

 

 

Step 8.

Press the OBW soft key.

 

 

Step 9.

Select measurement method, % or dBc down by pressing the corresponding soft

 

 

 

key and press ENTER.

 

 

5-1

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Anritsu S114C, S113C, S332C, S331C manual Chapter Spectrum Analyzer Measurements, Occupied Bandwidth
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S113C, S332C, S114C, S331C specifications

Anritsu, a leader in test and measurement solutions, offers a range of handheld tools that cater to the needs of professionals in the RF and microwave industries. Among these tools are the Anritsu S331C, S114C, S332C, and S113C, each designed with unique features and technologies that make them suitable for various applications.

The Anritsu S331C is a Cable and Antenna Analyzer that is particularly valued for its accuracy and ease of use. It operates within a frequency range of 3 MHz to 4 GHz, making it applicable for both wireless and microwave communication systems. One of its standout features is the built-in Time Domain Reflectometry (TDR) function, which allows technicians to pinpoint faults in cables quickly. The S331C's intuitive touch-screen interface ensures seamless operation, while its lightweight design allows for portability in the field.

On the other hand, the Anritsu S114C is a versatile handheld RF power meter that can measure a wide range of power levels and frequencies. Its exceptional measurement accuracy and broad dynamic range make it suitable for various applications, from network testing to maintenance. It supports both peak and average power measurements, providing users with the flexibility to adapt to different testing scenarios. The S114C also features a memory function that allows users to store and recall measurement data easily.

The S332C model is designed for more advanced applications, offering vector network analysis capabilities. Operating within a frequency range of 5 kHz to 4 GHz, it is used for characterizing components such as filters, amplifiers, and cables. The S332C features a high-resolution display and supports automated measurements, making it a powerful tool for engineers involved in the design and validation of RF components.

Lastly, the Anritsu S113C is an excellent choice for professionals requiring a compact and efficient solution for insertion loss and return loss measurements. This analyzer covers a frequency range of 5 kHz to 4 GHz and is especially suited for testing antennas and RF components. The S113C's lightweight design, combined with its user-friendly interface, allows operators to conduct measurements easily in various environments, ensuring high performance and reliability.

In summary, the Anritsu S331C, S114C, S332C, and S113C represent a comprehensive suite of handheld analyzers that cater to diverse needs in the RF and microwave sectors. With features like TDR function, RF power measurements, vector network analysis, and a focus on portability, these instruments are essential tools for professionals looking to enhance their testing capabilities and ensure high-quality network performance.
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