Sample Diagnostics; Finding The Faulty Assembly - HP 8517B Operating & Service Manual

Finding the Faulty
Assembly
Table 5-6
a1
Path1

Sample Diagnostics

Table 5-7
a1 a2
Path1 Path2
— —
B B
— B
B —
— —
B —
— B
— —
— —
— —
— —
— —
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.
Test Results for Path 1 through Path 6
a2 b1
Path2 Path 3
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.
Most Probable Failures (
Path
b1 b2 b1 thru
Path 3 Path 4 Path5
— — —
B B B
— B B
B — —
B — B
— — —
— — —
— B —
B — B
B — B
— B B
— B B
b2 b1 thru
Path 4 Path5
indicates Bad; indicates Good)
B —
Most Probable Failure
b2 thru Assembly, or Description of Condition
Path6
— The HP 8517B test set is not the problem
B The source, source cable, VTO, cables from rear
panel to switch splitter
— The switch splitter
B The switch splitter
— b1 sampler
— a1 sampler
— a2 sampler
B b2 sampler
B Port 1 connector or directional coupler
B A1, T1
— A2, T2
B Port 2 connector or directional coupler
HP 8517B S-Parameter Test Set Manual 5-23
Troubleshooting the Test Set
Troubleshooting Procedures
b2 thru
Path6