Troubleshooting the Test Set

Troubleshooting Procedures

Unratioed Power Test

We will examine six RF signal paths in the test set by observing their associated IF signals. Figure 5-10through Figure 5-15show the test set traces (and simplified block diagrams) that are typical for RF paths 1 through 6.

Isolating Signal Path Problems

Figure 5-9 Diagram of IF Signal Path

Determining the RF component in the test set that is most likely the cause of a failure can be accomplished within four steps:

1.Run the signal-path tests on paths 1 through 6 using the procedures on the following pages.

2.Record your test results in Table 5-6for each path.

3.Compare the results in Table 5-6with those in Table 5-7.

4.Investigate the most probable cause, based on the information in Table 5-7.

Testing Signal Paths 1-4

1.Set the network analyzer to its factory default settings by pushing the front-panel TEST switch.

2.Set the source for step mode. Press the network analyzer keys:

INSTRUMENT STATE [PRESET]

STIMULUS [MENU]

{STEP}

5-14HP 8517B S-Parameter Test Set Manual