HP 8517B - Manual (Page 83)

HP 8517B S-Parameter Test Set Manual 5-23
Troubleshooting the Test Set
Troubleshooting Procedures
Finding the Faulty
Assembly
Compare the results recorded in Table 5-6 with the matrix in Table 5-7.
There are 32 possible combinations, twelve of which point to probable
failures. These are shown in Table 5-7.
Sample Diagnostics Suppose you have determined that paths 3 and 5 are bad. Paths 1, 2, 4, and 6
are good. Refer to Table 5-7. Notice that the most likely cause for the failure
is the b1 sampler.
Table 5-6 Test Results for Path 1 through Path 6
a1
Path1
a2
Path2
b1
Path 3
b2
Path 4
b1 thru
Path5
b2 thru
Path6
Table 5-7 Most Probable Failures ( B indicates Bad; — indicates Good)
Path Most Probable Failure
a1
Path1
a2
Path2
b1
Path 3
b2
Path 4
b1 thru
Path5
b2 thru
Path6
Assembly, or Description of Condition
— — — — — — The HP 8517B test set is not the problem
B B B B B B The source, source cable, VTO, cables from rear
panel to switch splitter
— B — B B — The switch splitter
B — B — — B The switch splitter
— — B — B — b1 sampler
B — — — — — a1 sampler
— B — — — — a2 sampler
— — — B — B b2 sampler
— — B — B B Port 1 connector or directional coupler
— — B — B B A1, T1
— — — B B — A2, T2
— — — B B B Port 2 connector or directional coupler