Agilent Migrating Balanced Measurements from the HP 8903B to the U8903A Audio Analyzer - Application Note 59 free download

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Keysight Technologies Migrating Balanced Measurements from the HP 8903B to the Keysight U8903A Audio Analyzer Application Note 02 | Keysight | Migrating Balanced Measurements from the HP 8903B to the U8903A Audio Analyzer - Application Note Abstract Hewlett-Packard introduced the HP 8903B audio analyzer in 1980. It quickly became the industry standard because of its unprecedented performance and features. The U8903A audio analyzer is the next-generation audio analyzer from Keysight Technologies, Inc. (refer to Figure 1). This application note explains the HP 8903B and U8903A audio analyzers balanced connection architectures, and the accessories for migrating connections from the HP 8903B to U8903A Figure 1. The HP 8903B (left) and Keysight U8903A (right) audio analyzers HP 8903B Output and Input Older generation instruments like the HP 8903B provided BNC connector pairs for both the generator output and the analyzer input. Figure 2 shows a simplified block diagram of the analyzer input. The `HIGH' BNC connector is used in isolation when an unbalanced measurement is made. When a balanced measurement is made both the `HIGH' and `LOW' BNC connectors are used. The center conductor of the `HIGH' connector carries the signal and the `LOW' conductor carries the inverted signal. The outer conductors of both connectors are con- nected to ground. The generator output connections function in a similar way. BNC `Float' = Balanced/Unbalanced HIGH GND `Float' 100 k