Calibration Coefficient Test - Agilent Technologies PNA Series Service Manual

Tests and Adjustments
Performance Tests (Agilent N2721A Software Package)
If the Analyzer Fails this Test:
• A failure of this test indicates a failure of one or more of the following assemblies.
• A31 channel A receiver
• A34 channel B receiver
• A6 SPAM board
• Since all four receivers are identical, the channel A and channel B receivers can be
swapped with the channel R1 and channel R2 receivers to determine if they are the
cause of the failure. Refer to
Receiver Modules and LO Reject Filter Board" on page
receivers, repeat this test.
• If the analyzer still fails this test, replace the A6 SPAM board and repeat this test.
Refer to "Removing and Replacing the A6, A8, A9, and A10 Boards" on page

Calibration Coefficient Test

Function of the Test: To verify the uncorrected calibration coefficients of your analyzer.
The calibration coefficients are measured in forward and reverse direction. Refer to
Appendix A, "Error Terms,"
coefficients measured.
Specification Tested: Uncorrected System Performance
Equipment Used: A calibration kit and a test cable.
Description of the Test:
1. A series of 2-port calibrations are performed. Two full SOLT 2-port calibrations are
performed on each port. Isolation is turned off during each 2-port calibration.
2. A test cable is attached to the first port, and a calibration is performed at the end of the
cable and at the second port. The cable is moved to the second port and another
calibration is performed. Using two calibrations helps to eliminate the unknown
characteristics of the through cable.
3. Each calibration produces 12 error terms.
4. The error terms are used to determine the following characteristics: directivity, source
match, load match, reflection tracking, and transmission tracking.
If the Analyzer Fails this Test:
• If the analyzer fails tracking error terms only, perform
Adjustment" on page 3-44
• Failure of any other error terms indicate a hardware failure. Refer to the appropriate
error term discussion in
to Chapter 7, "Repair and Replacement Procedures,"
suspected faulty component or assembly.
3-32
"Removing and Replacing the A31, A32, A33, and A34
for error term information relating to the calibration
and repeat this test.
Appendix A, "Error Terms,"
PNA Series Microwave Network Analyzers
7-50. After swapping the
"Receiver Calibration
for a typical cause of failure. Refer
for instructions on replacing the
Service Guide E8361-90001
E8361A
7-18.