Agilent Technologies N5230A, Service Manual, Page: 60 / 262

3-30 Service Guide N5230-90014
Tests and Adjustments PNA Series Microwave Network Analyzers
Performance Tests (Agilent N7840A Software Package) N5230A
Frequency Accuracy Test
Function of the Test: To verify the frequency accuracy and range of the analyzer’s source
output.
Specification Tested: Test Port Output–CW Accuracy
Equipment Used: A frequency counter, a test cable, and adapters.
Description of the Test:
1. Port 1 is connected to a frequency counter.
2. A series of frequencies across the band are checked.
If the Analyzer Fails this Test:
• Verify the accuracy of the 10 MHz OCXO by using a frequency counter to measure the
rear-panel 10 MHz REF OUT. If the 10 MHz reference is off by more than 10 Hz,
perform the
“10 MHz Frequency Reference Adjustment” on page 3-35 and then repeat
this test.
Trace Noise Test
Function of the Test: To measure the stability of a signal in the internal source and
receiver system of your analyzer.
Specification Tested: Test Port Input–Trace Noise Magnitude and Trace Noise Phase
Equipment Used: A test cable.
Description of the Test:
1. Port 1 and Port 2 are connected with a test cable.
2. The analyzer is set to a series of CW frequencies across its frequency range.
3. Magnitude and phase are measured at each frequency at both 1 kHz and 10 kHz IF
bandwidths, in both directions.
4. Measurements are made at a nominal power level of 0 dBm and 201 points per sweep.
If the Analyzer Fails this Test:
• Repeat this test. It is unlikely for the analyzer to fail this test without a complete
failure of the network analyzer system.
• If the analyzer still fails this test, replace the A5 SPAM board and then repeat this test.
Refer to “Removing and Replacing the A5 through A10 Boards” on page 7-16 .