3-34 Service Guide N5230-90024
Tests and Adjustments PNA Series Microwave Network Analyzers
Performance Tests (Agilent N7840A Software Package) N5230C
Dynamic Accuracy Test
Function of the Test: To measure the relative power linearity of the analyzer’s receivers.
Specification Tested: Test Port Input–Dynamic Accuracy
Equipment Used: The dynamic accuracy test set, a power meter (E4418B or E4419B), power sensors, and
two test cables.
Description of the Test:
1. The analyzer’s test ports are tested separately at a specific CW frequency and a reference power level of
-20 dBm.
2. The analyzer’s driving port is connected to the dynamic accuracy test set’s source port and the
analyzer’s receiving port is connected to the dynamic accuracy test set’s receiver port. A power sensor
is connected to the dynamic accuracy test set’s power meter port.
3. The dynamic accuracy test set is used to input a signal from the driving port on the analyzer. The input
signal is routed through step attenuators to both the analyzer and a power sensor.
4. The analyzer source and the dynamic accuracy test set create power levels that are “deltas” from the
reference power level of -20 dBm. Each delta is measured two ways: by the power sensor and by the
analyzer’s receiver under test.
5. The analyzer’s power level into the port under test is set to the -20 dBm reference level.
6. The power level is measured with the power sensor: (P
mr
).
7. The power level is measured using the analyzer’s receiver under test: (P
pr
).
8. The power level into the analyzer’s port under test is stepped, in 5 dB steps, over the range of 0 to -120
dBm. Each power level represents a “delta” from the reference power level.
9. At each step, the power level is measured using the power meter: (P
md
).
10. At each step, the power level is measured using the receiver under test: (P
pd
).
11. The power error in dB = (P
mr
-P
md
)-(P
pr
-P
pd
).
If the Analyzer Fails this Test:
• If the analyzer fails this test, replace the A20 mixer brick and then repeat this test. Refer to “Removing
and Replacing the A20 Mixer Brick” on page 7-32.
• If the analyzer still fails this test, replace the A5 SPAM board and repeat this test. Refer to“Removing and
Replacing the A5 through A10 Boards and the Plenum Bracket” on page 7-16.
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