Agilent Technologies E8362A, Service Manual

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5-16 Service Guide E8364-90001
Theory of Operation PNA Series Microwave Network Analyzers
Signal Separation Group Operation E8362A, E8363A, E8364A
A23 and A24 Detectors (E8363A and E8364A Only)
The A23 and A24 detectors are used to level the reference signals R1 and R2 that are
routed to the channel R1 and R2 receivers.
30-dB Fixed Attenuators (E8362A Only)
The 30-dB fixed attenuators are placed in the reference signal paths to provide isolation.
A36 and A37 60-dB Step Attenuators (Option UNL)
The 60 dB step attenuators provide coarse power control for the test port signals. They are
electro-mechanical step attenuators, controlled by the A15 CPU board, that provide 0 to
60 dB of attenuation in 10 dB steps. They adjust the power level to the DUT without
changing the level of the incident power in the reference path.
A38 and A39 Bias Tees (Option UNL)
The A38 and A39 bias tees provide a means of biasing active devices with an external dc
voltage connected to the rear-panel DC BIAS CONNECT ports. The dc voltage is applied
directly to the center conductor of the test port connectors. A blocking capacitor ensures
that the dc bias current goes only to the DUT, and not back into the source. Similarly, an
inductor in the bias path prevents RF from being imposed on the external dc supply.
Figure 5-3 Signal Separation Group, Standard Analyzer