Technical data

User’s and Service Guide 49

87050A Option K22 Performance Tests

Insertion Loss

Step 1. Recall full 2-port calibration.

Step 2. Connect the cable that is attached to PORT 1 of the 8720D to the

A i/p 1 port of the 87050A Option K22.

Step 3. Connect the cable from PORT 2 of the analyzer to PORT 1 of the

87050A Option K22. Using the “CONTROL” program provided (see

"Example Programs" on page 26), select reflection port 1. e.g., “1,1,0,0”

(the selected transmission port does not matter). Verify using Table 5 on

page 47. Record the results on the appropriate line in Table 6 on

page 52.

Step 4. Repeat step 3 for each of the remaining test ports 2 through 12 and

AUX.

Step 5. Repeat step 3 for the A i/p 1–4 ports.

Step 6. Repeat step 2 through step 5, but connect the cable in step 2 to the B i/p

1 port of the 87050A Option K22. In step 2, select only the B i/p 1 port

instead of the A i/p 1 port. e.g., “0,0,1,1”.

Step 7. Repeat step 2 through step 5 for the remaining B i/p 2–4 ports.

Return Loss

This test will check both the internal termination load of each port, as well as the through

match when the appropriate input port is terminated with a load.

Step 1. Perform a one-port reflection calibration at the end of a 50 Ω cable over

the frequency range of 50 MHz to 20 GHz on the analyzer. Verify the

calibration is active and that the terminated cable displays a return

loss of 0 ±0.2 dB.

Step 2. Connect the cable (already connected to the REFLECTION

measurement port of the analyzer) to PORT 1 of the 87050A Option

K22. Connect a high-quality 50 Ω load to the A i/p 1 port of the 87050A

Option K22. Measure the return loss of PORT 1 by selecting port 1 via

the “CONTROL” program. e.g., “1,1,0,0” and viewing the display on the

analyzer.

Step 3. Repeat this measurement again, but this time select no active port. e.g.

“0,0,0,0”. The display should show “A-Terminated, B-Terminated”.

Step 4. Move the cable to PORT 2 and repeat step 2 and step 3, selecting PORT

as the “CONTROL” program entry in step 2. Repeat step 2 and step 3

for the remaining ports.

For the return loss specification for any input match when properly connected, see Table 5

on page 47. Record the test results on the appropriate line in Table 7 on page 53.