Technical data

Service Guide N5230-90025 3-33
PNA Series Microwave Network Analyzers Tests and Adjustments
N5230C Performance Tests (Agilent N7840A Software Package)
Calibration Coefficients 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 “Error Terms” in Chapter 8 for error term
information relating to the calibration 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 “Receiver Calibration Adjustment” on page 3-38
and repeat this test.
• Failure of any other error terms indicate a hardware failure. Refer to the appropriate error term
discussion in “Error Terms” in Chapter 8 for a typical cause of failure. Refer to Chapter 7, “Repair and
Replacement Procedures,” for instructions on replacing the suspected faulty component or assembly.