A PNA with an older version of firmware may cause test execution problems. Refer to the Readme.txt for firmware revision requirements. Note that N5230A/C models with firmware version below A.07.00 cannot use the Factory Recommended Variant.
If the PNA has RF loops on the front panel, make sure the RF connections for the loops are clean and properly torqued to 8 lb-in. The loops on a microwave PNA are installed horizontally. The loops on an RF PNA are installed vertically.
The specified warm-up time for a PNA to meet all specifications is ninety minutes. This specification should be observed when any performance test fails.
For a microwave PNA:
Make sure the Port 1 and Port 2 connectors are clean and within proper mechanical tolerances.
Make sure that RF cables show good performance over the frequency range of the PNA.
Use only the specified connectors and adapters.
Make sure all test equipment connectors are clean and in good condition.
Torque all connections to 8 lb-in.
Make sure all test equipment is properly warmed up.
The Initialize Flash Utility should be used when the flash memory is suspected of having corrupted flash files which adversely affect the performance of the PNA.
Common situations that can cause the flash file system to be corrupted and when this utility should be used are:
Performing A/B upgrades along with additional upgraded hardware such as Option 029/E29 (noise figure measurements) and LFE options (low frequency extension).
Frequency upgrades that sometimes cause calibration failures.
Repeated calibrations when multiple hardware is replaced which corrupts the flash file system.
Analyzers with extensive hardware replacements and subsequent calibrations that put the analyzer in a sub-optimal state.