User`s guide

30 User’s and Service Guide
87050A Option K24 Performance Tests
Performance Tests
Performance testing consists of measuring insertion loss, return loss and isolation between
all ports. For the most accurate measurements, the use of an Agilent 8720D 50 Ω Network
Analyzer is recommended and its use is recommended in this document. Familiarity with
RF/microwave measurements is assumed. The use of adapters may be required and their
effects should be accounted for. Performance tests will require the following equipment:
Agilent 8720D Network Analyzer
Test Port Extension Cables (85131-60012)
Agilent 85052B Cal Kit
Agilent 909D Option 040 or 50 Ω Termination (00909-60007)
NOTE Make a photocopy of the performance test record (later in this chapter) to
record the results of the performance tests.
There are no adjustments required for the 87050A Option K24 test set.
Perform a full two-port calibration over a frequency range of 50 MHz to 20 GHz at the ends
of two cables attached to the two test ports of the 8720D. Verify that the calibration is
active. Save the results to a disk, as they will be used again.
Set up the 8720D with the following:
1. Set the number of points to “201”.
2. Set the Bandwidth to “300 Hz”.
3. Set the 8720D to “Step Sweep”.
NOTE The Isolation Cal Routine is done with 16 averages.
Insertion Loss
Step 1. Recall the full two-port calibration.
Step 2. Connect the cable that is attached to Port 1 of the 8720D to the Transmission port
of the 87050A Option K24.
Step 3. Connect the cable from Port 2 of the analyzer to Port 1 of the 87050A Option K24.
Select Transmission Port 1 using the 8720D. Record the results in the
Performance Test Record, Table 6 beginning on Page 33.
Step 4. Repeat step 3 for each of the remaining test ports 2 through 24.
Step 5. Repeat steps 2 through 4, but connect the cable in step 2 to the Reflection port of
the 87050A Option K24. In step 3, select the Reflection port instead of the
Transmission port.