ANALOG SUBSYSTEM ASSEMBLIES

SYSTEM DESCRIPTION

A7 PCB, LO3 The A7, Third Local Oscillator (LO3) Assembly, provides a fixed

2.42MHz Local Oscillator signal that is used on the A3, A4, and A6 PCBs to down-convert the 2.5 MHz IF signals to 80 kHz. It also provides an 80 kHz standard signal for the IF Section Calibration process that occurs au- tomatically approximately every six minutes. This automatic IF Section Calibration is one of the 373XXA features that ensures rated measure- ment accuracy. Automatic IF Calibration can be turned off and/or invoked at any time during measurement sweeps.

A5 A/D Converter PCB The A5 A/D Converter PCB contains a six-channel, two stage, switched-filter sample-and-hold circuit and a 20 bit A/D converter. Each of the six DC signals from the A3, A4, and A6 PCBs are input to a sepa- rate channel of the PCB. The first stage of each channel is a low-pass fil- ter with four selectable cutoff frequencies of 10 kHz, 1 kHz, 100 Hz, and 10 Hz. The second stage of each channel is a sample-and-hold amplifier that stores the signals during the A/D conversion process. Each channel is sequentially selected for input to the 20 bit A/D converter.

The A5 A/D Converter PCB also derives the 109.89 kHz Power Supply Synchronization Signal and the 80 kHz IF Synchronization Signal from the 10 MHz Reference Timebase. Additional functions of the A5, A/D Converter Assembly include:

￿Measurement of power supply voltages and other internal nodes of the 372XXB for diagnostic purposes.

￿Measurement of an externally applied analog input signal. This function is used for service purposes only.

￿External Trigger Input signal processing (from rear panel)

￿External Analog Output signal generation (to rear panel)

The A/D converter circuitry located on the A/5 PCB is used as a DVM to measure various internal system analog monitor points on the

A1 – A8 and A21A1/ A21A2 PCBs. It is also used to monitor power supply voltages and other critical points throughout the 373XXA, which can be readout via the Diagnostics Menus. DVM readings are also recorded in the service log for certain system failures.

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373XXA MM

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Anritsu 373XXA manual Analog Subsystem Assemblies
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373XXA specifications

The Anritsu 373XXA series is a notable line of microwave and RF signal analyzers designed for comprehensive analysis and testing of various wireless communication technologies. These analyzers are specifically crafted to meet the demands of modern communication systems, making them ideal for engineers and technicians working in wireless research, development, and manufacturing.

One of the main features of the Anritsu 373XXA series is its wide frequency range, which typically spans from as low as 5 kHz to several GHz, accommodating a vast array of signal types and applications. This extensive frequency coverage allows users to test and validate all manner of systems, from LTE and 5G networks to satellite communications, yielding accurate and reliable measurement results.

The device employs advanced measurement technologies that provide in-depth analysis capabilities. Among these technologies is the ability to perform both time and frequency domain measurements, allowing users to visualize and diagnose signal integrity issues effectively. In addition, the 373XXA series incorporates vector signal analysis, which is crucial in evaluating complex modulated signals, commonly found in today’s sophisticated wireless communication protocols.

Another distinguishing characteristic of the Anritsu 373XXA is its user-friendly interface. It features a large, high-resolution display that enables easy navigation through the analyzer's functions and measurements. The intuitive design is further enhanced by customizable settings and measurement configurations that streamline the workflow, making it accessible for both novice and experienced users.

The 373XXA series also supports various digital and analog signal demodulation techniques, ensuring compatibility with an array of communication standards. Furthermore, users can benefit from its built-in signal generation capabilities, which allows for end-to-end testing of devices and systems under realistic operational conditions.

Portability is another key feature of the Anritsu 373XXA series. The compact design and lightweight structure facilitate easy transport, which is particularly advantageous for field applications where mobility is critical.

Overall, the Anritsu 373XXA series stands out as a versatile and powerful tool for professionals in the RF and microwave field, thanks to its extensive frequency range, advanced measurement technologies, user-friendly interface, and portability. Whether developing new wireless standards or troubleshooting existing systems, the 373XXA delivers precision and reliability essential for today’s dynamic communication landscape.
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