Technical data

3-30 Service Guide N5230-90025
Tests and Adjustments PNA Series Microwave Network Analyzers
Performance Tests (Agilent N7840A Software Package) N5230C
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.