Spurious Responses Performance Test

This test applies to the following models:

This test verifies that the analyzer meets its specification for input related spurious responses. In this test, the source is connected to the RF Input and set for the spur frequency. The source amplitude is measured using a power meter. The source frequency is then moved to the frequency location that will create the spur at the analyzer center frequency. The amplitude of the source is kept consistent by using the power meter. The analyzer then measures the spurious response at the spur frequency.

For PXA, UXA, MXA, and CXA analyzers with Option B40, B85, B1A, B1X, B2X, or B5X, the test is repeated for these options. The test is run in IQ Analyzer (Basic) mode since these options are only accessible in this mode. Basic mode has an FFT Residual which is at center screen. This residual is an artifact of the FFT algorithm. In order to prevent the spurious response from landing on the residual, the analyzer center frequency is offset by 100 Hz. This offset places the spur 100 Hz from center screen.

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Required Test Equipment

Test Equipment

Recommended Model Number

Microwave Signal Generator #1

PSG Models
(see equipment list)

Power Meter


Microwave Power Sensor

  • Options ≤ 526


Microwave Power Splitter

  • Options ≤ 526


Millimeter Power Sensor

  • Options > 526

N8487A CFT

Millimeter Power Splitter

  • Options > 526


Coaxial Cable, 2.4 mm


Coaxial Cable, 3.5 mm


BNC Cable


3.5 mm (f) to 3.5 mm (f) adapter
(for 3.5 mm source)


3.5 mm (m) to Type-N (m) adapter


3.5 mm (f) to Type-N (m) adapter


2.4 mm (f) to Type-N (m) adapter


Connection Setups

In the following setups, cables are designated as solid lines and direct connections are designated as dashed lines.

Power Meter Calibration

Spurious Responses Test Setup