Service Guide 12-23
8719ET/20ET/22ET Theory of Operation
8719ES/20ES/22ES Signal Separation: ET Models Only
RF Network Analyzers
A69 Step Attenuator (All ET Option 004 Models)
The step attenuator provides coarse power control for the source signal. It is an
electro-mechanical attenuator, controlled by the A7 CPU, that provides 0 to 55 dB of
attenuation in 5 dB steps. It adjusts the power level to the device under test (DUT) without
changing the level of the incident power in the reference path.
A23 DC Block (8719ET Option 004 and 8720ET Option 004 Only)
The dc block prevents a dc voltage from entering the analyzer by way of a device under test
(DUT).
A62 Directional Couplers
The test signal goes into the through-line arm of the coupler, and from there to the
REFLECTION port and the device under test (DUT). The coupled arm of the coupler
carries the signal reflected from the DUT to the receiver for measurement. The coupling
coefficient of the directional couplers is nominally 14 dB (840 MHz to 40.05 GHz) and
(40 dB at 50 MHz
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