Service Guide N5230-90024 3-29
PNA Series Microwave Network Analyzers Tests and Adjustments
N5230C Performance Tests (Agilent N7840A Software Package)
Source Maximum Power Output Test
Function of the Test: To confirm the maximum source output power of your network analyzer over its full
frequency range.
Specification Tested: Test Port Output–Maximum Leveled Power
Equipment Used: A power meter, power sensors, and adapters.
Description of the Test:
1. A power sensor is connected to Port 1.
2. The analyzer’s output is set to hundreds of CW frequencies and, at each frequency, the output power is
increased until an “UNLEVELED” error is detected.
3. The power level at this point is measured and compared to the maximum output power specification.
If the Analyzer Fails this Test:
•Go to “Checking the Signal through the Signal Separation Path” on page 4-37 for troubleshooting
information to determine the faulty assembly.
Source Power Linearity Test
Function of the Test: To verify that the power level is linear over the analyzer’s frequency range and to check
the linearity of the automatic leveling control (ALC).
Specification Tested: Power Sweep Range and Power Level Linearity
Equipment Used: A test cable. (And a 20 dB attenuator if the analyzer does not have an internal step
attenuator.)
Description of the Test:
1. The Port 2 receiver is used to test Port 1. The receiver linearity is the standard against which the source
linearity is checked.
2. A test cable is connected between Port 1 and Port 2 with 20 dB of attenuation in series with the cable.
This can be done with an internal step attenuator or an external 20 dB attenuator. This attenuation
ensures that the receiver remains in its linear range.
3. The analyzer is set to 25 different points across its frequency range.
4. At each frequency point, the output power level on Port 2 is set to 0.000 dBm and the power is measured
to establish a reference, P
reference
.
5. The source setting is then stepped from -15 to +10 dBm in 1 dB steps and the power is measured,
P
measured
, at each setting.
6. The non-linearity in dB at each frequency point is calculated as:
(P
measured
- P
reference
) - (source setting)
If the Analyzer Fails this Test:
• Perform the “Source Calibration Adjustment” on page 3-38 and repeat this test.
• If the analyzer still fails this test, replace the A17 MASS 26.5 (for the 20 GHz analyzer) or the A19 MASS
50 (for the 40GHz and 50 GHz analyzers) and then repeat this test. Refer to “Removing and Replacing the
A17 MASS 26.5” on page 7-26 or to “Removing and Replacing the A19 MASS 50” on page 7-30.
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