Technical data

User’s and Service Guide 6-7
Servicing the Test Set
Performance Testing
Testing for Isolation
Isolation needs to be measured only on adjacent ports. Two 50 Ω loads
are required for this test.
Step 1. Recall the adapter removal calibration stored previously in the internal
memory of the network analyzer
Step 2. Connect two (2) high-quality 50
Ω loads to both the Transmission and
Reflection ports on the test set.
Step 3. Turn the averaging on by pressing:
[AVG] > AVERAGING ON
Step 4. Connect the two cables that are attached to the network analyzer to
Port 1 and Port 2 of the test set. The exact order does not matter.
Step 5. Select "Reflection Port 1" on the network analyzer by pressing:
[SEQ] > TTL I/O > PARALLEL ALL OUT
Enter the decimal (D in Table 5-1 on page 5-6) value to select the port,
then press:
[x1]
Check the status LCD on the network analyzer for the port selected.
Step 6. Repeat the previous step (step 5), but select "Transmission Port 2" on
the network analyzer. Check the status LCD on the test set for the port
selected.
Step 7. On the network analyzer, press:
[MENU] > TRIGGER MENU > NUMBER OF GROUPS > [16] > [x1]
Wait until the analyzer is finished making the measurement, then
press:
[SCALE REF] > AUTO SCALE > [MARKER]
Step 8. On the analyzer, press:
MARKER FCTN > MKR SEARCH > TRACKING > ON > SEARCH > MAX
NOTE Once the marker tacking is turned on, the user no longer needs to
repeat step 8
Step 9. Write the maximum value in the “Isolation Test Record”, Table 6-2 on
page 6-13, for the ports being measured.
Step 10. Repeat steps 5 through 9 for the next two adjacent ports, 2 and 3.
Repeat again for ports 3 and 4, and then for ports 4 and 5, and so on
until you have tested ports 15 and 16.