HP 8517B Manuel d'utilisateur télécharger pdf (Page 62)

5-2

HP 8517B S-Parameter Test Set Manual

Troubleshooting the Test Set

Theory of Operation

RF paths for Port 1 and Port 2 are similar. This section discusses in detail the

source power signal, as it is routed via the RF IN connector, through the test

set, and to Port 1 for S

and S

measurements.

Figure 5-1 Standard HP 8517B RF Block Diagram

TheRFSourcePower • RF source power enters the test set through the rear panel. The RF power

is applied to the switch/splitter (A18).

• At the switch/splitter, the power is attenuated by approximately 7 to

14 dB, depending upon frequency.

• The switch/splitter receives its control signals from the attenuator/switch

driver board (A5).

• The switch part of the switch/splitter, which is a combination of two

power splitters and a solid-state switch, selects the power splitter to use

and, therefore, the test port to receive the RF power.

• LEDs on the front panel and on the attenuator/switch driver board (A5)

indicate which test port is active.

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HP 8517B Manuel d'utilisateur Page 62