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6. Radio Frequency Bridges.
Contents:
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6.1 Bridge basics. Part 1: Christie's Bridge. Generalising the bridge. Voltage-splitting networks. Part 2: Generators and detectors. Part 3: Practical impedance bridges. Admittance bridge. The universal bridge. Vector and scalar addition. Impedance magnitude bridge. Monitoring Bridges. |
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6.2 Current transformers. Part 1: Intro. Equivalent circuit. Models. Transfer function. Output impedance. Insertion impedance. Part 2: LF response. Core selection. Propagation delay. Secondary capacitance. |
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Part 3: Multiple secondaries. A 6.1: Current transformer coupling factor. A 6.2: The maximally-flat current transformer. A 6.3: Amplitude response of conventional and maximally-flat current transformers. 6.3 Transmission bridges. Part 1: Current transformer bridges: Low frequency compensation. Douma-Buschbeck (capacitive voltage sampling) bridge. 6.4 Reflectometry. Part 1: <writing in progress>. 6.5 Magnitude-Difference Bridges. Part 1: Intro. Prototype current-transformer magnitude-bridge. Insertion defect. Load-side voltage sampling. Port balancing. RVS. CVS. Detectors and summing networks. Absolute measurements. Part 2: The bridge as an analog computer. Resistance bridges. Part 3: Phasor theorems. Conductance bridges. <writing in progress>. The G3GFC M50 Match Meter: Details of the original prototype units. References for chapter 6. Appendices: A 6.4: Evaluation and optimisation of current-transformer bridges. Part 1: Circuit model. Test procedure optimisation. Data analysis techniques. Faraday shield displacement current. Part 2: Factors affecting phase and amplitude performance. Bridge performance evaluation. Inductance balance and phase compensation. Part 3: Phase compensation techniques cont'd. Bridges without Faraday shield. |
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A 6.5: A self-evaluating precision
reference bridge. Using the theory developed in A6.4
to produce a 50Ω transmission bridge with phase accuracy
better than ±0.1° and magnitude accuracy better than
±0.2% over the 1.6 to 30MHz range. A 6.6: (u) RVS and Maxflat transmission bridges < >. . |
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Hatfield RF Bridge Type LE 300/A
and LE 300/A1. Douma's generator power-factor correction scheme. Herzog's current-transformer LF-compensation method. |
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