Chapter 5 Spectrum Analyzer Measurements

Step 10. Press the MEAS key to initiate actual measurement. The Site Master will display the measurement results in the display area.

The Site Master default value for the % method is 99%, and N dBc down is 3 dB down.

The table below provides typical instrument settings for measuring a CW and an IS-95 CDMA signal.

Table 5-1. Typical Occupied Bandwidth Measurement Settings

 

CW Wave

IS-95 CDMA Signal

 

 

 

Frequency Span

900 MHz

900 MHz

 

 

 

Reference Level

–15 dBm

–10 dBm

 

 

 

Input Attenuation Level

Auto

Auto

 

 

 

Resolution Bandwidth

Auto

10 kHz

 

 

 

Video Bandwidth

Auto

30 kHz

 

 

 

Channel Power Measurement

One of the most common measurements for a transmitter is that of channel power. This test measures the output power, or channel power, of a transmitter over a frequency range and a specific time interval. Channel Power measurements are used to validate transmitter perfor- mance, verify compliance with FCC regulations, and keep overall system interference at a minimum.

Out-of-specification power measurements indicate system faults in the power amplifier or in-filter circuits.

Channel Power Measurement with the Site Master

The Site Master can be used to measure CDMA signals in terms of channel power. It is nec- essary to use precise and specific settings to accurately measure the CDMA signal because the CDMA is different from CW signals.

For accurate IS-95 CDMA measurements, use the following settings:

￿CDMA Channel Bandwidth: 1.23 MHz

￿RBW setting: 10 kHz

￿VBW ￿ 3￿ RBW or at least 30 kHz

￿Averaging function turned off

Required Equipment

￿Site Master Model S114C or S332C

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

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

5-2

Page 67
Image 67
Anritsu S331C, S113C, S332C, S114C manual Channel Power Measurement with the Site Master

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.