Keysight N5227A - System Performance Verification; When to Verify

6-6 Installation and Service Guide N5251-90001
Performance Tests and Checks
System Performance Verification
PNA Series Microwave Network Analyzer System
N5251A
System Performance V
erification
Since the N5251A has typical (non-warranted) specifications only, the
SYSTEM
PERFORMANCE VERIFICATION is not a PASS/FAIL test. The SYSTEM
PERFORMANCE VERIFICATION is a procedure to establish current performance
of the system. See “Interpreting the Verification Results” on page 6-15 for more
detail.
System verification is performed at the N5251A system 1.0 mm port connectors over a frequency
range of 45 MHz to 110 GHz with a Keysight 85059A 1.0 mm Calibration and Verification kit. The
basic verification process checks a pair of ports at one time. Verification of a 2-port system typically
takes about 20 minutes. Verification of a 4-port system typically takes about 35 minutes.
The system verification procedure is automated by the analyzer firmware. For each verification
device, the system measures the magnitude and phase for all four S-parameters and reads data for
the device from the 85059A kit. The procedure displays the measured data along with the kit data to
allow a visual comparison.
During the system verification process, it is NECESSARY that the verification devices be measured with
their female connectors connected to Port 1 and their male connectors connected to Port 2. A 1.0
mm female-to-female cable connected to Port 2. This cable is included in the 85059A 1.0 mm
Calibration and Verification kit.
When to Verify
After installation of the system is complete, a performance verification is necessary to assure proper
system operation. This initial verification is included with the installation.
After the initial verification, the verification should be repeated once a year. This recommended
interval
assumes that Keysight cables are used with the system.
If non-Keysight cables, adapters, or other fixtures are used, the verification schedule must be
determined by the user, as the characteristics of these devices are unknown. In establishing a
verification schedule, the following factors should be considered:
• Frequency of use
• Amount of cable movement
• Amount of drift occurring between prior verifications
Performance verification of a system performed at long intervals is not to
be confused with measurement calibration. Measurement calibration
typically is performed on a daily basis, or when the measurement setup or
conditions have changed.