AEnhancing Measurement Accuracy

Understanding System Measurement Calibration

Measurement accuracy is degraded by the effects of three different types of measurement errors: systemic, drift, and random.

Systemic errors are caused by imperfection in the test equipment and test setup.

Drift errors occur when a test system’s performance changes after a calibration has been performed. Drift errors are caused primarily by variations in the ambient temperature of the measurement environment.

Random errors are caused by instrument noise (sampler noise, IF noise floor, etc.), switch repeatability and connector repeatability. These errors vary randomly as a function of time.

You can compensate for systemic and drift errors by performing a system measurement calibration prior to measuring a device. (Performing a measurement calibration has no effect upon random errors.)

To increase the accuracy of your measurements, perform a system measurement calibration before performing device measurements. Repeat the measurement calibration if the ambient temperature of the measurement environment has deviated ±1°C since the last measurement calibration.

This procedure performs a modified full 2- port measurement calibration to remove the following errors:

•Directivity

•Source- load match

•Reflection tracking

•Transmission tracking

The isolation calibration (crosstalk correction) has been omitted. Isolation calibration is only required when measuring high- isolation devices such as a switch in the open position or high- dynamic range devices such as filters with a high level of rejection.

Required Tools

•Agilent 85225F performance modeling system

•Agilent 85056A 2.4 mm calibration kit, or

•Agilent 85056D 2.4 mm calibration kit

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Installation and User’s Guide

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Agilent Technologies 85225F manual Understanding System Measurement Calibration, Required Tools
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85225F specifications

Agilent Technologies 85225F is a high-performance microwave signal generator designed for the most demanding test and measurement applications in the RF and microwave frequency domains. This versatile instrument is a vital tool for engineers and technicians who require precise and reliable signal generation in various fields such as telecommunications, aerospace, and electronic warfare.

One of the main features of the Agilent 85225F is its frequency coverage, which spans from 0.1 to 26.5 GHz. This broad frequency range allows users to address a wide array of applications, including component testing, system verification, and radar signal simulation. With exceptional frequency resolution and accuracy, the 85225F ensures the generation of clean and stable signals tailored to specific operational requirements.

The 85225F incorporates advanced phase-locked loop (PLL) technology, which contributes to its superior frequency stability and low phase noise. This technology is crucial for applications requiring precise signal integrity and minimal jitter, such as digital communications and high-frequency circuit testing. The instrument’s low phase noise is particularly advantageous for sensitive measurements and data transmission systems where signal quality is paramount.

In addition to its impressive frequency and phase noise characteristics, the Agilent 85225F features multiple modulation capabilities, including amplitude modulation (AM), frequency modulation (FM), and pulse modulation. These modulation options enable users to simulate a wide variety of real-world signals and testing conditions, enhancing the versatility of the instrument in various testing environments.

The 85225F also offers a user-friendly interface that facilitates ease of operation. The clear LCD screen displays essential parameters and settings, allowing users to make adjustments quickly and efficiently. Furthermore, the instrument supports remote programming and automation through its GPIB or LAN connectivity options, making it suitable for integration into larger test systems.

Another notable characteristic of the Agilent 85225F is its compact design, which does not compromise on performance. This space-saving design makes it ideal for both lab and field applications, allowing engineers to transport the generator with ease, while still maintaining the ruggedness required for demanding environments.

Overall, the Agilent Technologies 85225F stands out as a robust and reliable microwave signal generator, equipped with state-of-the-art features and technologies that cater to the needs of modern RF testing. Its broad frequency coverage, advanced modulation capabilities, low phase noise, and user-friendly interface make it an essential tool for a wide range of applications in the RF and microwave sector.
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