A25 And A26 Test Port Couplers; A23 And A24 Detectors (E8363C And E8364C Only); 30-Db Fixed Attenuators (E8362C Only) - Agilent Technologies E8362C Service Manual

PNA Series Microwave Network Analyzers Theory of Operation
E8362C, E8363C, E8364C Signal Separation Group Operation
Figure 5-3 Signal Separation Group, Standard Analyzer

A25 and A26 Test Port Couplers

The test port signal goes into the through-line arm of the couplers, and from there to the test ports and the
DUT. The coupled arm of the couplers carries the signal reflected from or transmitted through the DUT, to the
receiver (through a front panel jumper for Option 014) for measurement. The coupling coefficient of the
directional couplers is nominally 15 dB over the full frequency range.

A23 and A24 Detectors (E8363C and E8364C Only)

The A23 and A24 detectors sense the R1 and R2 reference signal levels and provide feedback to the ALC
circuitry on the A16 test set motherboard.

30-dB Fixed Attenuators (E8362C Only)

The 30-dB fixed attenuators are placed in the reference signal paths to provide isolation. The source power
output is sufficiently stable over this frequency range that ALC feedback is not necessary.
Service Guide E8364-90038 5-17